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  • 1. Irina Gorbach Alexander Berger Edward Melomed ®Microsoft SQL ™Server 2008Analysis Services UNLEASHED 800 East 96th Street, Indianapolis, Indiana 46240 USA
  • 2. Microsoft® SQL Server™ 2008 Analysis Services Unleashed Editor-in-ChiefCopyright © 2009 by Pearson Education, Inc. Karen GettmanAll rights reserved. No part of this book shall be reproduced, stored in a retrievalsystem, or transmitted by any means, electronic, mechanical, photocopying, recording, Executive Editoror otherwise, without written permission from the publisher. No patent liability is Neil Roweassumed with respect to the use of the information contained herein. Although everyprecaution has been taken in the preparation of this book, the publisher and author Acquisitions Editorassume no responsibility for errors or omissions. Nor is any liability assumed for Brook Farlingdamages resulting from the use of the information contained herein. Development EditorISBN-13: 978-0-672-33001-8ISBN-10: 0-672-33001-6 Mark RenfrowLibrary of Congress Cataloging-in-Publication Data: Managing Editor Patrick KanouseMelomed, Edward. Microsoft SQL server 2008 analysis services unleashed / Edward Project EditorMelomed, Alexander Berger, Irina Gorbach. Jennifer Gallant p. cm. Copy Editor ISBN 978-0-672-33001-8 Keith Cline 1. SQL server. 2. Client/server computing. 3. Relational databases.I. Berger, Alexander. II. Gorbach, Irina. III. Title. Indexer QA76.9.C55M483 2008 Ken Johnson 005.7565--dc22 Proofreader 2008049303 Water CrestPrinted in the United States of America Publishing, Inc.First Printing December 2008 PublishingTrademarks CoordinatorAll terms mentioned in this book that are known to be trademarks or service markshave been appropriately capitalized. Sams Publishing cannot attest to the accuracy of Cindy Teetersthis information. Use of a term in this book should not be regarded as affecting the Book Designervalidity of any trademark or service mark. Gary AdairWarning and DisclaimerEvery effort has been made to make this book as complete and as accurate as possi- Compositorble, but no warranty or fitness is implied. The information provided is on an “as is” Mark Shirarbasis. The authors and the publisher shall have neither liability nor responsibility to anyperson or entity with respect to any loss or damages arising from the information Graphicscontained in this book. Laura RobbinsBulk SalesPearson offers excellent discounts on this book when ordered in quantity for bulkpurchases or special sales. For more information, please contact: U.S. Corporate and Government Sales 1-800-382-3419 corpsales@pearsontechgroup.comFor sales outside of the U.S., please contact: International Sales +1-317-581-3793 international@pearsontechgroup.com
  • 3. Contents at a Glance Introduction....................................................................................................1Part 1: Introduction to Analysis Services 1 Introduction to OLAP and Its Role in Business Intelligence .........................7 2 Multidimensional Space ...............................................................................17 3 Client/Server Architecture and Multidimensional Databases: An Overview27Part 2: Creating Multidimensional Models 4 Conceptual Data Model................................................................................37 5 Dimensions in the Conceptual Model .........................................................43 6 Cubes and Multidimensional Analysis.........................................................63 7 Measures and Multidimensional Analysis....................................................75 8 Advanced Modeling ......................................................................................91 9 Multidimensional Models and Business Intelligence Development Studio ...................................................................................109Part 3 Using MDX To Analyze Data 10 MDX Concepts............................................................................................139 11 Advanced MDX...........................................................................................161 12 Cube-Based MDX Calculations...................................................................189 13 Dimension-Based MDX Calculations .........................................................221 14 Extending MDX with Stored Procedures....................................................237 15 Key Performance Indicators, Actions, and the DRILLTHROUGH Statement .......................................................................261 16 Writing Data into Analysis Services ...........................................................291Part 4 Creating a Data Warehouse 17 Loading Data from a Relational Database..................................................307 18 DSVs and Object Bindings..........................................................................317 19 Multidimensional Models and Relational Database Schemas ...................329
  • 4. Part 5 Bringing Data into Analysis Services 20 The Physical Data Model ............................................................................345 21 Dimension and Partition Processing ..........................................................377 22 Using SQL Server Integration Services to Load Data .................................407 23 Aggregation Design and Usage-Based Optimization..................................417 24 Proactive Caching and Real-Time Updates ................................................435 25 Building Scalable Analysis Services Applications .......................................451Part 6 Analysis Server Architecture 26 Server Architecture and Command Execution...........................................477 27 Memory Management ................................................................................503 28 Thread Management...................................................................................521 29 Architecture of Query Execution—Calculating MDX Expressions ............527 30 Architecture of Query Execution—Retrieving Data from Storage .............553Part 7 Accessing Data in Analysis Services 31 Client/Server Architecture and Data Access ...............................................569 32 XML for Analysis ........................................................................................579 33 ADOMD.NET...............................................................................................599 34 Analysis Management Objects....................................................................669Part 8 Security 35 Security Model for Analysis Services ..........................................................713 36 Securing Dimension Data ...........................................................................731 37 Securing Cell Values....................................................................................751Part 9 Management 38 Using Trace to Monitor and Audit Analysis Services .................................763 39 Backup and Restore Operations..................................................................787 40 Deployment Strategies ................................................................................805 41 Resource Monitoring...................................................................................815 Index ...........................................................................................................823
  • 5. Table of Contents Introduction 1Part 1: Introduction to Analysis Services 1 Introduction to OLAP and Its Role in Business Intelligence 7 The Multidimensional Data Model ................................................................8 The Conceptual Data Model .................................................................9 The Application Data Model .................................................................9 The Physical Data Model.......................................................................9 Unified Dimensional Model................................................................11 Basic Concepts .....................................................................................13 2 Multidimensional Space 17 Describing Multidimensional Space .............................................................17 Dimension Attributes....................................................................................20 Cells...............................................................................................................22 Measures........................................................................................................22 Aggregation Functions ..................................................................................23 Subcubes........................................................................................................24 3 Client/Server Architecture and Multidimensional Databases: An Overview 27 Two-Tier Architecture ...................................................................................28 One-Tier Architecture ...................................................................................29 Three-Tier Architecture .................................................................................30 Four-Tier Architecture ...................................................................................31 Distributed Systems ......................................................................................32 Distributed Storage ..............................................................................32 Thin Client/Thick Client.....................................................................32Part 2: Creating Multidimensional Models 4 Conceptual Data Model 37 Data Definition Language.............................................................................37 Objects in DDL ....................................................................................38 Multilanguage Support ........................................................................39 Rules of Ordering.................................................................................41 Specifying Default Properties ..............................................................41 Rules of Inheritance.............................................................................42 5 Dimensions in the Conceptual Model 43 Dimension Attributes....................................................................................44 Attribute Properties and Values...........................................................45 Relationships Between Attributes........................................................47 Attribute Member Keys........................................................................50
  • 6. vi Contents Attribute Member Names ....................................................................53 Relationships Between Attributes........................................................54 Dimension Hierarchies .................................................................................57 Types of Hierarchies.............................................................................57 Attribute Hierarchies.....................................................................................60 6 Cubes and Multidimensional Analysis 63 Cube Dimensions..........................................................................................65 Cube Dimension Attributes.................................................................68 Cube Dimension Hierarchies...............................................................69 Role-Playing Dimensions.....................................................................70 The Dimension Cube....................................................................................71 Perspectives ...................................................................................................72 7 Measures and Multidimensional Analysis 75 Measures in a Multidimensional Cube.........................................................76 SUM......................................................................................................78 MAX and MIN .....................................................................................79 COUNT ................................................................................................79 DISTINCT COUNT...............................................................................79 Measure Groups ............................................................................................81 Measure Group Dimensions .........................................................................84 Granularity of a Fact............................................................................84 Measure Group Dimension Attributes and Cube Dimension Hierarchies ............................................................87 8 Advanced Modeling 91 Parent-Child Relationships ...........................................................................91 Parent-Child Hierarchies .....................................................................94 Attribute Discretization ................................................................................95 Indirect Dimensions .....................................................................................97 Referenced Dimensions .......................................................................98 Many-to-Many Dimensions ..............................................................102 Measure Expressions ...................................................................................105 Linked Measure Groups ..............................................................................107 9 Multidimensional Models and Business Intelligence Development Studio 109 Creating a Data Source ...............................................................................110 Creating a New Data Source..............................................................110 Modifying an Existing Data Source...................................................111 Modifying a DDL File ........................................................................112 Designing a Data Source View ....................................................................114 Creating a New Data Source View.....................................................114 Modifying a DSV ...............................................................................115
  • 7. Contents vii Designing a Dimension ..............................................................................117 Creating a Dimension .......................................................................118 Modifying an Existing Dimension ....................................................119 Designing a Cube........................................................................................124 Creating a Cube .................................................................................124 Modifying a Cube ..............................................................................125 Building a Cube Perspective ..............................................................130 Defining Cube Translations...............................................................131 Configuring and Deploying a Project So That You Can Browse the Cube ...............................................................................133 Configuring a Project ........................................................................133 Deploying a Project ...........................................................................135 Browsing a Cube ................................................................................136Part 3 Using MDX To Analyze Data 10 MDX Concepts 139 The SELECT Statement ...............................................................................140 The SELECT Clause ............................................................................140 Defining Coordinates in Multidimensional Space ...........................141 Default Members and the WHERE Clause ........................................144 Query Execution Context ...........................................................................147 Set Algebra and Basic Set Operations .........................................................149 Union .................................................................................................149 Intersect .............................................................................................150 Except.................................................................................................150 CrossJoin ............................................................................................151 Extract ................................................................................................152 MDX Functions...........................................................................................152 Functions for Navigating Hierarchies ...............................................153 The Function for Filtering Sets..........................................................155 Functions for Ordering Data .............................................................157 Referencing Objects in MDX and Using Unique Names ...........................158 By Name.............................................................................................158 By Qualified Name ............................................................................159 By Unique Name ...............................................................................159 11 Advanced MDX 161 Using Member and Cell Properties in MDX Queries .................................161 Member Properties.............................................................................161 Cell Properties....................................................................................162 Dealing with Nulls ......................................................................................165 Null Members, Null Tuples, and Empty Sets ....................................165 Nulls and Empty Cells .......................................................................170
  • 8. viii Contents Type Conversions Between MDX Objects..................................................173 Strong Relationships ...................................................................................174 Sets in a WHERE Clause..............................................................................177 SubSelect and Subcubes ..............................................................................180 Applying Visual Totals .......................................................................185 12 Cube-Based MDX Calculations 189 MDX Scripts ................................................................................................191 Calculated Members ...................................................................................192 Defining Calculated Members...........................................................193 Assignments ................................................................................................198 Assignment Operator.........................................................................199 Specifying a Calculation Property .....................................................202 Scope Statements ...............................................................................203 Root and Leaves Functions................................................................206 Calculated Cells .................................................................................208 Named Sets..................................................................................................209 Static Name Sets.................................................................................210 Dynamic Named Sets.........................................................................213 Order of Execution for Cube Calculations .................................................215 The Highest Pass Wins ......................................................................216 Recursion Resolution .........................................................................218 13 Dimension-Based MDX Calculations 221 Unary Operators..........................................................................................221 Custom Member Formulas .........................................................................225 Semi-Additive Measures ..............................................................................227 ByAccount Aggregation Function .....................................................229 Order of Execution for Dimension Calculations .......................................232 The Closest Wins ...............................................................................233 14 Extending MDX with Stored Procedures 237 Creating Stored Procedures.........................................................................239 Creating Common Language Runtime Assemblies ..........................239 Using Application Domains to Sandbox Common Language Runtime Assemblies........................................................244 Creating COM Assemblies.................................................................245 Calling Stored Procedures from MDX ........................................................246 Security Model ............................................................................................248 Role-Based Security ............................................................................248 Code Access Security .........................................................................248 User-Based Security............................................................................249
  • 9. Contents ix Server Object Model....................................................................................251 Operations on Metadata Objects.......................................................252 Operations on MDX Objects .............................................................255 Calling Back into Stored Procedures ..........................................................257 Using Default Libraries ...............................................................................260 15 Key Performance Indicators, Actions, and the DRILLTHROUGH Statement 261 Key Performance Indicators........................................................................261 Defining KPIs .....................................................................................262 Discovering and Querying KPIs ........................................................270 Actions ........................................................................................................272 Defining Actions................................................................................273 Discovering Actions...........................................................................279 Drillthrough ................................................................................................283 DRILLTHROUGH Statement..............................................................285 Defining DRILLTHROUGH Columns in a Cube ...............................287 16 Writing Data into Analysis Services 291 Using the UPDATE CUBE Statement to Write Data into Cube Cells ........292 Updatable and Non-Updatable Cells..........................................................298 Lifetime of the Update................................................................................299 Enabling Writeback.....................................................................................301 Converting a Writeback Partition to a Regular Partition...........................303 Other Ways to Perform Writeback..............................................................304Part 4 Creating a Data Warehouse 17 Loading Data from a Relational Database 307 Loading Data...............................................................................................307 Data Source Objects ....................................................................................310 Data Source Object Properties ...........................................................310 Data Source Security ..........................................................................312 Connection Timeouts........................................................................314 Connection Pooling ..........................................................................314 18 DSVs and Object Bindings 317 DSV Objects ................................................................................................317 Named Queries and Named Calculations .........................................319 Object Bindings...........................................................................................321 Column Bindings...............................................................................321 Row Bindings .....................................................................................323 Tabular Bindings ................................................................................324 Query Bindings ..................................................................................326
  • 10. x Contents 19 Multidimensional Models and Relational Database Schemas 329 Relational Schemas for Data Warehouses ..................................................329 Optimizing Relational Schemas ........................................................331 Building Relational Schemas from the Multidimensional Model .............334 Using Wizards to Create Relational Schemas ...................................334 Using Templates to Create Relational Schemas ................................339Part 5 Bringing Data into Analysis Services 20 The Physical Data Model 345 Internal Components for Storing Data ......................................................346 Data Store Structure...........................................................................346 File Store Structure.............................................................................346 Bit Store Structure..............................................................................348 String Store Structure.........................................................................348 Compressed Store Structure...............................................................349 Hash Index of a Store ........................................................................350 Data Structure of a Dimension ...................................................................351 Data Structures of the Attributes.......................................................351 Attribute Relationships ......................................................................355 Data Structures of Hierarchies ...........................................................360 Physical Model of the Cube........................................................................364 Defining a Partition Using DDL........................................................364 Physical Model of the Partition.........................................................367 Overview of Cube Data Structures ....................................................375 21 Dimension and Partition Processing 377 Dimension Processing.................................................................................377 Attribute Processing...........................................................................377 Hierarchy Processing .........................................................................383 Building Decoding Tables ..................................................................384 Building Indexes ................................................................................384 Schema of Dimension Processing .....................................................385 Dimension Processing Options .........................................................386 Processing ROLAP Dimensions .........................................................388 Processing Parent-Child Dimensions ................................................389 Cube Processing ..........................................................................................390 Data Processing..................................................................................391 Building Aggregations and Indexes...................................................393 Cube Processing Options...................................................................395 Progress Reporting and Error Configuration..............................................400 ErrorConfiguration Properties ...........................................................402 Processing Error Handling .................................................................405
  • 11. Contents xi22 Using SQL Server Integration Services to Load Data 407 Using SSIS....................................................................................................408 Using Direct-Load ETL ................................................................................409 Creating an SSIS Dimension-Loading Package .................................410 Creating an SSIS Partition-Loading Package .....................................41423 Aggregation Design and Usage-Based Optimization 417 Aggregations and Collection of Aggregations ............................................417 Designing Aggregations ..............................................................................419 Relational Reporting-Style Dimensions ............................................420 Flexible Versus Rigid Aggregations ....................................................422 Aggregation Objects and Aggregation Design Objects .....................423 The Aggregation Design Algorithm...................................................426 Query Usage Statistics .................................................................................427 Setting Up a Query Log .....................................................................428 Manual Design and Management of Aggregations....................................431 Monitoring Aggregation Usage...................................................................43324 Proactive Caching and Real-Time Updates 435 Data Latency and Proactive Caching .........................................................436 Timings and Proactive Caching..................................................................438 Update Frequency..............................................................................438 Long-Running MOLAP Cache Processing .........................................439 Proactive Caching Scenarios.......................................................................440 MOLAP Scenario ................................................................................440 Scheduled MOLAP Scenario ..............................................................440 Automatic MOLAP Scenario ..............................................................441 Medium-Latency MOLAP Scenario ...................................................442 Low-Latency MOLAP Scenario ..........................................................442 Real-Time HOLAP Scenario ...............................................................442 Real-Time ROLAP Scenario ................................................................443 Change Notifications and Object Processing During Proactive Caching......443 Scheduling Processing and Updates..................................................443 Change Notification Types................................................................445 Incremental Updates Versus Full Updates.........................................447 General Considerations for Proactive Caching ..........................................448 Monitoring Proactive Caching Activity .....................................................44825 Building Scalable Analysis Services Applications 451 Approaches to Scalability............................................................................451 The Scale-Up Approach .....................................................................451 The Scale-Out Approach....................................................................452
  • 12. xii Contents OLAP Farm ..................................................................................................453 Data Storage .......................................................................................453 Network Load Balancing ...................................................................455 Linked Dimensions and Measure Groups ..................................................455 Updates to the Source of a Linked Object ........................................457 Linked Dimensions............................................................................457 Linked Measure Groups.....................................................................461 Remote Partitions........................................................................................464 Processing Remote Partitions ............................................................466 Using Business Intelligence Development Studio to Create Linked Dimensions .......................................................................467 Using BI Dev Studio to a Create Virtual Cube..................................468 Shared Scalable Databases...........................................................................470 AttachDetach, Read-Only, and DbStorageLocation .................................470 Detach ................................................................................................470 Attach.................................................................................................472 Read-Only ..........................................................................................473 DbStorageLocation.............................................................................473Part 6 Analysis Server Architecture 26 Server Architecture and Command Execution 477 Command Execution ..................................................................................477 Session Management ..................................................................................481 Server State Management ...........................................................................482 Executing Commands That Change Analysis Services Objects .................483 Creating Objects ................................................................................484 Editing Objects ..................................................................................484 Deleting Objects ................................................................................486 Processing Objects .............................................................................486 Commands That Control Transactions.............................................489 Managing Concurrency .....................................................................491 Using a Commit Lock for Transaction Synchronization ..................492 Canceling a Command Execution..............................................................494 Batch Command .........................................................................................496 27 Memory Management 503 Economic Memory Management Model....................................................504 Server Performance and Memory Manager ................................................504 Memory Holders ................................................................................504 Memory Cleanup...............................................................................507 Managing Memory of Different Subsystems ..............................................509 Cache System Memory Model...........................................................509
  • 13. Contents xiii Managing Memory of File Stores ......................................................510 Managing Memory Used by User Sessions .......................................510 Other Memory Holders .....................................................................510 Memory Allocators......................................................................................511 Effective Memory Distribution with Memory Governor ...........................512 Memory Models of Attribute and Partition Processing ....................515 Memory Model of Building Aggregations.........................................517 Memory Model of Building Indexes .................................................518 28 Thread Management 521 Thread Pools................................................................................................522 Architecture of a Thread Pool.....................................................................523 Managing Threads by Different Subsystems ..............................................525 29 Architecture of Query Execution—Calculating MDX Expressions 527 Query Execution Stages ..............................................................................528 Parsing an MDX Request ............................................................................530 Creation of Calculation Scopes ..................................................................531 Global Scope and Global Scope Cache .............................................535 Session Scope and Session Scope Cache ...........................................536 Global and Session Scope Lifetime ...................................................536 Building a Virtual Set Operation Tree ........................................................538 Optimizing Multidimensional Space by Removing Empty Tuples............541 Calculating Cell Values ...............................................................................542 Logical Plan Construction .................................................................542 Physical Plan Construction ...............................................................546 Execution of the Physical Plan..........................................................547 Cache Subsystem ........................................................................................548 Dimension and Measure Group Caches ...........................................548 Formula Caches .................................................................................550 30 Architecture of Query Execution—Retrieving Data from Storage 553 Query Execution Stages ..............................................................................554 Querying Different Types of Measure Groups............................................556 Querying Regular Measure Groups ...................................................556 Querying ROLAP Partitions...............................................................559 Querying Measure Groups with DISTINCT_COUNT Measures........560 Querying Remote Partitions and Linked Measure Groups ...............563 Querying Measure Groups with Indirect Dimensions......................564Part 7 Accessing Data in Analysis Services 31 Client/Server Architecture and Data Access 569 Using TCP/IP for Data Access .....................................................................569 Using Binary XML and Compression for Data Access......................570
  • 14. xiv Contents Using HTTP for Data Access .......................................................................571 Offline Access to Data.................................................................................573 Client Components Shipped with Analysis Services .................................574 Using XML for Analysis to Build Your Application ..........................574 Using Analysis Services Libraries to Build Your Application ............575 Query Management for Applications Written in Native Code ........576 Query Management for Applications Written in Managed Code ......576 Using DSO and AMO for Administrative Applications ....................577 32 XML for Analysis 579 State Management ......................................................................................580 XML/A Methods..........................................................................................583 The Discover Method ........................................................................583 The Execute Method..........................................................................587 Handling Errors and Warnings ...................................................................593 Errors That Result in the Failure of the Whole Method...................594 Errors That Occur After Serialization of the Response Has Started ......596 Errors That Occur During Cell Calculation ......................................597 Warnings ............................................................................................598 33 ADOMD.NET 599 Creating an ADOMD.NET Project ..............................................................599 Writing Analytical Applications .................................................................602 ADOMD.NET Connections.........................................................................603 Working with Metadata Objects.................................................................610 Operations on Collections.................................................................612 Caching Metadata on the Client.......................................................615 Working with a Collection of Members (MemberCollection)..........618 Working with Metadata That Is Not Presented in the Form of Objects ...............................................................................625 AdomdCommand .......................................................................................630 Properties ...........................................................................................630 Methods .............................................................................................632 Using the CellSet Object to Work with Multidimensional Data ...............636 Handling Object Symmetry...............................................................644 Working with Data in Tabular Format .......................................................647 AdomdDataReader .............................................................................649 Using Visual Studio User Interface Elements to Work with OLAP Data .......................................................................................652 Which Should You Use: AdomdDataReader or CellSet? ............................654 Using Parameters in MDX Requests ...........................................................655 Asynchronous Execution and Cancellation of Commands.......................657
  • 15. Contents xv Error Handling ............................................................................................662 AdomdErrorResponseException ........................................................663 AdomdUnknownResponseException ................................................666 AdomdConnectionException............................................................666 AdomdCacheExpiredException.........................................................666 34 Analysis Management Objects 669 AMO Object Model .....................................................................................669 Types of AMO Objects .......................................................................670 Dependent and Referenced Objects ..................................................678 Creating a Visual Studio Project That Uses AMO ......................................685 Connecting to the Server............................................................................685 Canceling Long-Running Operations.........................................................688 AMO Object Loading ..................................................................................692 Working with AMO in Disconnected Mode ..............................................693 Using the Scripter Object............................................................................694 Using Traces ................................................................................................697 Error Handling ............................................................................................706 OperationException...........................................................................706 ResponseFormatException.................................................................707 ConnectionException........................................................................708 OutOfSyncException .........................................................................708Part 8 Security 35 Security Model for Analysis Services 713 Connection Security ...................................................................................714 TCP/IP Connection Security..............................................................714 HTTP Security ....................................................................................715 External Data Access Security .....................................................................718 Choosing a Service Logon Account ..................................................718 Configuring Access to External Data Sources ...................................719 Changing a Service Logon Account ..................................................720 Security for Running Named Instances (SQL Server Browser) .........721 Security for Running on a Failover Cluster.......................................721 Object Security Model for Analysis Services...............................................721 Server Administrator Security............................................................722 Database Roles and Permission Objects ............................................723 Defining Object Permissions .............................................................726 Managing Database Roles..................................................................730 36 Securing Dimension Data 731 Defining Dimension Security .....................................................................734 The AllowedSet and DeniedSet Properties ........................................735
  • 16. xvi Contents The VisualTotals Property ...........................................................................740 Defining Dimension Security Using the User Interface ...................742 Testing Dimension Security ........................................................................744 Dynamic Dimension Security.....................................................................746 Dimension Security Architecture................................................................748 Dimension Security, Cell Security, and MDX Scripts.................................748 37 Securing Cell Values 751 Defining Cell Security.................................................................................751 Testing Cell Security....................................................................................754 Contingent Cell Security ............................................................................756 Dynamic Cell Security ................................................................................758Part 9 Management 38 Using Trace to Monitor and Audit Analysis Services 763 Trace Architecture .......................................................................................764 Types of Trace Objects ................................................................................765 Administrative Trace..........................................................................765 Session Trace ......................................................................................765 Flight Recorder Trace .........................................................................765 Creating Trace Command Options ............................................................766 SQL Server Profiler ......................................................................................768 Defining a Trace.................................................................................768 Running a Trace.................................................................................770 Flight Recorder ............................................................................................773 How the Flight Recorder Works ........................................................774 Configuring Flight Recorder Behavior ..............................................775 Discovering Server State ....................................................................776 Tracing Processing Activity .........................................................................776 Reporting the Progress of Dimension Processing .............................776 Reporting the Progress of Partition Processing .................................779 Query Execution Time Events ....................................................................780 Running a Simple Query ...................................................................780 Changing the Simple Query..............................................................781 Running a More Complex Query......................................................782 Changing the Complex Query..........................................................783 Changing Your Query Just a Little More ..........................................784
  • 17. Contents xvii39 Backup and Restore Operations 787 Backing Up Data .........................................................................................787 Planning Your Backup Operation......................................................788 Using the Backup Database Dialog Box to Back Up Your Database ...790 Using a DDL Command to Back Up Your Database.........................792 Backing Up Related Files.............................................................................793 Backing Up the Configuration File ...................................................793 Backing Up the Query Log Database ................................................793 Backing Up Writeback Tables ............................................................794 Backup Strategies.........................................................................................795 Typical Backup Scenario ....................................................................795 High-Availability System Backup Scenario........................................795 Automating Backup Operations .................................................................796 SQL Server Agent ...............................................................................796 SQL Server Integration Services.........................................................797 AMO Application...............................................................................798 Restoring Lost or Damaged Data ................................................................798 Using the Restore Database Dialog Box ............................................799 Using the DDL Command to Restore Your Database .......................800 Using DISCOVER_LOCATIONS to Specify Alternative Locations for Partitions ...................................................................801 MDX Extensions for Browsing Your File System........................................803 The MDX Extensions.........................................................................80440 Deployment Strategies 805 Using the Deployment Wizard ...................................................................805 Synchronizing Your Databases ...................................................................807 Using the Synchronize Database Wizard ..........................................809 Using a DDL Command to Synchronize Databases .........................809 Similarities Between the Synchronization and Restore Commands 811 Synchronization and Remote Partitions ....................................................812 Synchronization and Failover Clusters.......................................................81441 Resource Monitoring 815 DMVs and SchemaRowsets .........................................................................816 Querying DMVs and SQL Semantics ..........................................................817 Monitoring Connections, Sessions, and Commands.................................818 Monitoring Server State ..............................................................................820 Using Perfmon Counters ............................................................................821 Index 823
  • 18. xviii ContentsForewordI am pleased to see this book being updated for a second edition, to cover the changes inAnalysis Services 2008, and also to clarify some of the more difficult material in the firstedition. This should make the book even more useful to its target users.Now that Analysis Services is in its fourth major release, it has become a big, complexproduct, far removed from the relatively simple first release of a mere decade earlier. Tomake the most of it, model designers need much more knowledge than is available in theonline documentation, which makes books like this all the more necessary. And, of course,now that the product is so widely used, sometimes for quite challenging applications, thereis much more experience of the best practices to follow. Some of these are now baked intothe product itself, but books like this can provide much more context for their use.The authors are to be highly commended for putting in the effort to comprehensivelyupdate a substantial work like this; I know from my own experience how much extramotivation you need to update an existing publication after just two years, compared tothe excitement of creating the first edition. All too often, publications like this remainfrozen when new versions of the software they describe are released, leaving users to guesswhich parts remain true, and which have been superseded. In this case, this secondedition actually follows more closely on the heels of Analysis Services 2008 than did thefirst edition on Analysis Services 2005.Microsoft is also to be commended for continuing to permit or even encourage the disclo-sure of this level of detail about one of its major products; with the consolidation of theBI industry, some of the other major vendors have become much less willing to providedetailed information about the inner workings of their products. In any case, I have neverknown any other OLAP server vendor to be so open.Users of Analysis Services are fortunate in the range of books available to them: morethan for all the other OLAP servers combined. This is clearly the book for the most tech-nical users who really need and want to understand exactly how Analysis Services works.There are many other books for those just getting started with Analysis Services, or whowant a clear ‘how do I?’ guide. The many application developers who just want toimprove their Analysis Services skills will probably find this book overwhelming; there areat least a dozen simpler books to choose from. And, needless to say, this book is definitelynot aimed at business users who want to understand what Analysis Services can do forthem.Nigel PendseEditor of The OLAP ReportAuthor of The OLAP Survey
  • 19. About the AuthorsIrina Gorbach is a senior development lead at Microsoft. She joined the Analysis Servicesteam soon after its creation over 11 years ago. During her work at Microsoft, Irina hasdesigned and developed many features of the Analysis Services product, and was responsiblefor client subsystem: OLEDB and ADOMD.Net. Irina was in the original group of architectsthat designed XML for Analysis specification; she worked on the architecture and design ofcalculation algorithms and currently is working on scalability of Analysis Services.Alexander Berger was one of the first developers to work on OLAP systems at Panorama,prior to their purchase by Microsoft. After the acquisition, Alexander led the developmentof Microsoft OLAP Server through all of its major releases prior to SSAS 2008. Currently,Alexander leads the Business Intelligence department for Microsoft adCenter. He is one ofthe architects of OLEDB for the OLAP standard and MDX language, and holds more than30 patents in the area of multidimensional databases.Edward Melomed is one of the original members of the Microsoft SQL Server AnalysisServices team. He arrived in Redmond as part of Microsoft’s acquisition of PanoramaSoftware Systems, Inc., which led to the technology that gave rise to Analysis Services2008. He works as a program manager at Microsoft and plays a major role in the infra-structure design for the Analysis Services engine.AcknowledgmentsWe are incredibly grateful to many people who have gone out of their way to help withthis book.To Py Bateman, our co-author, for making this book possible.To Mosha Pasumansky, MDX guru, for answering all our questions and providing us withyour expertise. Your mosha.com served as a terrific tool in our research.To Marius Dimitru, formula engine expert, for helping us explain the details of theformula engine architecture and exposing power of the latest improvements.To Akshai Mirchandani, engine expert, for support and help with writeback, proactivecaching, and drillthrough.To Michael Vovchik, storage engine expert, for support and help with DMVs.To Oleg Lvovitch, expert in Visual Studio integration—thanks for help with the innerworkings of Analysis Services tools.To Adrian Dumitrascu, AMO expert, for answering numerous questions.Thanks to Bala Atur, Michael Entin, Jeffrey Wang, Ksenia Kosobutsky, and VladimirChtepa, for your extensive reviews and feedback.To Brook Farling, our talented and professional editor—thanks for your help to publishthis book and publish it on time.We would like to give special thanks to the publishing team at Sams: Neil Rowe, MarkRenfrow, Brook Farling, and Jennifer Gallant for all your support and patienc