Database Mirroring
Database Snapshots
  SQL Server 2008

                                                 USA & France


 ...
Agenda
Database Mirroring – SQL Server 2008
Database Mirroring 2005 vs 2008 benchmark
Database Mirroring 2008 SSD benchmar...
Database Architechs
Principals

               Paul Bertucci
                   Founder Database Architechs
              ...
Database Architechs
                Primary Services
                            Data Analysis
                           ...
Past and Current
Customers


            Intel               Applied Materials
            Cisco               Apple Compu...
Database Mirroring?


                                                           =
                                Adventu...
Log Shipping
                                       “Source”
                                                             ...
Client           Client            Client             Client


                                   Network

               ...
Copy-on-write Technology
The new “copy-on-write” technology that Microsoft has created, is at the core of
the database mir...
DB Mirroring Terms
The Principal database server - is the source of the mirroring. You can mirror one
or more databases on...
DB Mirroring Modes
 High-availability mode, High-protection mode, and High-performance mode.
             [you must sacrif...
Fail-over methods
Automatic failover - is enabled with a three-server configuration; a principal, a
mirror, and a witness ...
Rule-of-Thumb
 You should use database mirroring:
 • If you need to increase the availability of the database layer
 • If ...
Cannot be used with:
Database Mirroring cannot be used for any of SQL Server’s internal
databases    TempDB, Master DB, MS...
Instance: SQL08DE01                                          Instance: SQL08DE02
Endpoint name: “EndPoint4DBMirroring1430”...
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Creating Endpoints
   -- create endpoint for PRINCIPAL server --
   CREATE ENDPOINT [EndPoint4DBMirroring1430]
           ...
Creating Endpoints
-- create endpoint for MIRROR server --
CREATE ENDPOINT [EndPoint4DBMirroring1440]
          STATE=STAR...
Backup Principal
BACKUP DATABASE [AdventureWorks]
   TO DISK = N'C:Program FilesMicrosoft SQL
              N'C:         F...
Restore to Mirror
RESTORE FILELISTONLY
 FROM DISK = N'C:Program FilesMicrosoft SQL
              N'C:       Files
ServerMS...
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SQL Server 2008
              SQL Server 2008
                                                                            ...
DB Mirroring 2005
    versus
DB Mirroring 2008
  Benchmarks
Instance: SQL08DE01                                          Instance: SQL08DE02
Endpoint name: “EndPoint4DBMirroring1430”...
DB Mirroring 2005 Benchmarks
Repl_rows stored procedure 9999999


                            Send Rate
DB Mirroring 2008 Benchmarks
              Send Rate




   41% More
DB Mirroring 2005 Benchmarks

            Restore Rate
DB Mirroring 2008 Benchmarks
           Restore Rate




    52% more
DB Mirroring 2005 Benchmarks
DB Mirroring 2005 Benchmarks
DB Mirroring 2008 Benchmarks
DB Mirroring 2008 Benchmarks
DB Mirroring Benchmark Summary

Overall send rate 41 % faster (2005 vs 2008)
Overall restore rate 52% faster (2005 vs 2008...
DB Mirroring 2008
              Solid State Disks
                Benchmarks
DB Mirroring 2008 Conventional Disk configura...
Instance: SQL08DE01                                          Instance: SQL08DE02
Endpoint name: “EndPoint4DBMirroring1430”...
DB Mirroring 2008 SSD Benchmarks
DB Mirroring 2008 Conventional Disk
Mirroring Conventional Disk
Client Execution Time               5:11:59 AM
Query Profile Statistics
 Number of transaction...
DB Mirroring 2008 SSD
Send Rate 26% Faster




         Restore Rate 17% Faster
Mirroring Solid State Disk
Client Execution Time                    3:53:14 AM
Query Profile Statistics
 Number of transac...
DB Mirroring SSD Benchmark Summary

Overall send rate 26 % faster (2008 Conventional versus SSD)
Overall restore rate 17% ...
P&T Products
Database Products


              SQL SuperVision – Sybase
               SQL SuperVision – Oracle
          ...
Snapshots




                                      52
 Copyright 2009 all rights reserved
Tr
                                                          an
                                                          ...
Source Data
                        Pages

  Source

    02
SQL Server 2008


                                            ...
Source
                                 Data
                                Pages

       Source

         03
     SQL Se...
Snapshot
                                                                        Users
                           Source D...
Transactional
            Users
                                                   Data
                                  ...
Us All
                                                       er
                                                         ...
Us
                                                          er
                           Generating                     ...
Te
                                                    Us stin
                                                      er g
...
Tr
                                              an
                                                s
                    ...
SQL Server 2008
              SQL Server 2008
                                                                            ...
Instance: SQL2008xyz
                                   Endpoint Name: “endpoint4mirroring”
                              ...
DB Mirror and
          Publisher

                                                                      Replication
SQL S...
Distributing Data
                                  Sites
Data Access Latency Autonomy               Frequency Network Mac...
Questions
        Is there any time left????




Send your questions to:
     pbertucci@dbarchitechs.com
                 ...
SQL Clustering basic configuration
   SQL
                                                                               C...
SQL Server Workshop Paul Bertucci
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SQL Server Workshop Paul Bertucci

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SQL Server 2008 Migration workshop given by Paul Bertucci, April 2009.

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SQL Server Workshop Paul Bertucci

  1. 1. Database Mirroring Database Snapshots SQL Server 2008 USA & France Migrating to 2008 Benchmarks 2005 vs 2008 Benchmarking 2008 on SSD 1 Copyright 2009 all rights reserved
  2. 2. Agenda Database Mirroring – SQL Server 2008 Database Mirroring 2005 vs 2008 benchmark Database Mirroring 2008 SSD benchmark Database Snapshots 2008 (we might get to it) SQL Performance & Tuning Tool (SQL Shot)
  3. 3. Database Architechs Principals Paul Bertucci Founder Database Architechs Former Chief Data Architect – Veritas & Symantec Currently Chief Architect - Autodesk Author of SQL Server 2000, 2005 & 2008 Unleashed! Co-Author of ADO.NET in 24 hours Author MS SQL Server High Availability Author Sybase Performance & Tuning Author Sybase Physical DB Design Veritas SQL Server Performance Series pbertucci@dbarchitechs.com Thierry Gerardin • Managing Principal - Database Architechs - Management, Research and Development, DB Design and P&T for MS SQL Server, Sybase and Oracle • European focus until recently/company growth leader – multiple years • Expanding DB ARCH consulting practices to USA and Asia • Sybase P&T and DBA Certified Professional • Contributor to SQL Server 2005 Unleashed! tgerardin@dbarchitechs.com 3 Copyright 2009 all rights reserved
  4. 4. Database Architechs Primary Services Data Analysis & Modeling Database Design Business Intelligence & Data Delivery Platforms Data Architecture Distributed Data & Data Replication Performance & Tuning Master Data Management High Availability Database Education & Training 4 Copyright 2009 all rights reserved
  5. 5. Past and Current Customers Intel Applied Materials Cisco Apple Computers Charles Schwab PG&E Aplia Thomson Learning AGIS Sybase Veritas Symantec Corporation Honda Motors Nissan Motors Toshiba Computers Breg International Juniper Networks CSAA Safeway Stores Federal Express Wells Fargo Bank of America Robert Half Merrill Lynch Metalinc many others….
  6. 6. Database Mirroring? = Adventure Adventure Works DB Works DB A “complete” copy of a database that is created and maintained with as up to the second completeness that is possible a mirror image. What’s new or improved? Compression in log transactions across topology Various other performance enhancements 3 years of production execution success! 6 Copyright 2009 all rights reserved
  7. 7. Log Shipping “Source” “Destination” SQL Server 2008 SQL Server 2008 TxnLog Primary CallOne DB Secondary backups Server Server translog CallOne DB BackupCallOne_tlog_200405141120.TRN Last log shipped Delay Answer LogShareCallOne_tlog_200405141120.TRN TxnLog TxnLog Restores Copies “Monitor” SQL Server 2008 Delay between logs loaded Delay Answer Monitor MSDB DB Server 7 Don’t buildCopyright 2009 all rights reserved deprecated ! on this, it is being
  8. 8. Client Client Client Client Network A SQL Server 2008 SQL Server 2008 DB Mirror Server MirroringAdventure D Principal Adventure D Works DB B Works DB Server translog translog C SQL Server xyz Witness MSDB DB Server 8 Copyright 2009 all rights reserved
  9. 9. Copy-on-write Technology The new “copy-on-write” technology that Microsoft has created, is at the core of the database mirroring capability. A transaction from a client connection to the principal server (arrow label A) is written to the adventure works database (label D). Once the transaction is written to the principal servers transaction log, it is immediately copied (arrow label B) and written to the Mirror Server (also labeled D). When this physical log record is written to the mirror server, it sends back an acknowledgement (arrow label C) to the principal of its write success. This is the “copy-on-write” technology. The end result is that the mirror server is in the exact same state as the principal server (when the physical log record has been successfully written on the mirror side). 9 Copyright 2009 all rights reserved
  10. 10. DB Mirroring Terms The Principal database server - is the source of the mirroring. You can mirror one or more databases on a single SQL Server instance to another SQL Server instance. You cannot mirror a database on one SQL Server instance to itself (the same SQL Server instance). The Mirror database server - will be the recipient of the mirroring from the principal database server. This mirrored database will be kept in a hot standby mode and cannot be used directly in any way. In fact, once you have configured database mirroring, this database will show its status as in continuous “restore mode”. The Witness database server - is used when you want to be continuously checking to see if any failures have occurred to the primary database server and to help make the decision to failover to the mirror database server. It is optional, but a sound way to configure database mirroring. If you do not identify a witness server, the principal and mirror are left on their own to decide to fail-over or not. 10 Copyright 2009 all rights reserved
  11. 11. DB Mirroring Modes High-availability mode, High-protection mode, and High-performance mode. [you must sacrifice levels of protection for performance] Synchronous operation - a committed transaction will be committed (written) on both partners of the database mirroring pair. This obviously adds some latency cost to a complete transaction (it is across two servers). High-availability mode and High-protection mode use synchronous operations (termed High safety) Asynchronous operation - transactions commit without waiting for the mirror server to write the log to disk. This can speed up performance significantly. High-performance mode uses asynchronous operations. Whether the operations are asynchronous or synchronous depends on the “transaction safety” setting. This is controlled by the SAFETY option when configuring with Transact-SQL commands (Set to FULL for synchronous operations, set to OFF for asynchronous operations). 11 Copyright 2009 all rights reserved
  12. 12. Fail-over methods Automatic failover - is enabled with a three-server configuration; a principal, a mirror, and a witness server. Synchronous operations are required and the mirror database must already be synchronized (in sync with the transactions as they are being written to the principal). Role switching is done automatically. This is for high- availability mode. Manual failover - is needed when there is no witness server and is also doing synchronous operations. The principal and the mirror are connected to each other and the mirror database must already be synchronized. Role switching is done manually. This is for high-protection mode. Forced Service - in the case where there is a mirror server available, but it might not be synchronized. It can be forced to take over when the principal server has failed. This will possibly have data loss, since the transactions were not synchronized. This is for either high-protection or high-performance mode. 12 Copyright 2009 all rights reserved
  13. 13. Rule-of-Thumb You should use database mirroring: • If you need to increase the availability of the database layer • If you need to have automatic data protection (redundant storage of data) • If you need to decrease the downtime that would normally be required to do upgrades And very often: • If you need to off load reporting (periodic data snapshots) without impacting the transactional system use database mirroring with database snapshots. • Combo Needs: If you need data distribution, high availability and high data resiliency - use data replication with database mirroring. 13 Copyright 2009 all rights reserved
  14. 14. Cannot be used with: Database Mirroring cannot be used for any of SQL Server’s internal databases TempDB, Master DB, MSDB, or Model DB. Database Mirroring is NOT supported in SQL Server Workgroup Edition or Express Edition. However, these server editions could be used as Witness servers. You cannot have database mirroring for databases enabled with FILESTREAM storage. 14 Copyright 2009 all rights reserved
  15. 15. Instance: SQL08DE01 Instance: SQL08DE02 Endpoint name: “EndPoint4DBMirroring1430” Endpoint name: “EndPoint4DBMirroring1440” Role: PARTNER Role: PARTNER Example 2008 SQL Server 2008 SQL Server Mirror Server Configuratio Principal Adventure Adventure n Works DB Works DB Server translog translog TCP: Listener_Port: 1430 TCP: Listener_Port: 1440 SQL Server 2008 Witness MSDB DB Server TCP: Listener_Port: 1450 Instance: SQL08DE03 Endpoint name: “EndPoint4DBMirroring1450” Role: WITNESS 15 Copyright 2009 all rights reserved
  16. 16. 1 16 Copyright 2009 all rights reserved
  17. 17. 2 17 Copyright 2009 all rights reserved
  18. 18. 3 18 Copyright 2009 all rights reserved
  19. 19. Creating Endpoints -- create endpoint for PRINCIPAL server -- CREATE ENDPOINT [EndPoint4DBMirroring1430] STATE=STARTED AS TCP (LISTENER_PORT = 1430, LISTENER_IP = ALL) FOR DATA_MIRRORING (ROLE = PARTNER, AUTHENTICATION = WINDOWS NEGOTIATE , ENCRYPTION = REQUIRED ALGORITHM RC4) SQL Server Log entry 01/05/2009 13:17:23,spid55,Unknown,The Database Mirroring protocol transport is now listening for connections. 01/05/2009 13:17:23,spid55,Unknown,Server is listening on [ 'any' <ipv4> 1430]. 19 Copyright 2009 all rights reserved
  20. 20. Creating Endpoints -- create endpoint for MIRROR server -- CREATE ENDPOINT [EndPoint4DBMirroring1440] STATE=STARTED AS TCP (LISTENER_PORT = 1440, LISTENER_IP = ALL) FOR DATA_MIRRORING (ROLE = PARTNER, AUTHENTICATION = WINDOWS NEGOTIATE , ENCRYPTION = REQUIRED ALGORITHM RC4) -- create endpoint for WITNESS server -- CREATE ENDPOINT [EndPoint4DBMirroring1450] STATE=STARTED AS TCP (LISTENER_PORT = 1450, LISTENER_IP = ALL) FOR DATA_MIRRORING (ROLE = WITNESS, AUTHENTICATION = WINDOWS NEGOTIATE , ENCRYPTION = REQUIRED ALGORITHM RC4) 20 Copyright 2009 all rights reserved
  21. 21. Backup Principal BACKUP DATABASE [AdventureWorks] TO DISK = N'C:Program FilesMicrosoft SQL N'C: Files ServerMSSQL10.SQL08DE01MSSQLBackupAdventureWorks4Mirror.bak' Server MSSQL10.SQL08DE01 MSSQL Backup WITH FORMAT GO -- Processed 17672 pages for database 'AdventureWorks', file 'AdventureWorks_Data' on file 1. 'AdventureWorks_Data' -- Processed 3 pages for database 'AdventureWorks', file 'AdventureWorks_Log' on file 1. 'AdventureWorks_Log' -- BACKUP DATABASE successfully processed 17675 pages in 7.718 seconds (17.890 MB/sec). seconds BACKUP LOG [AdventureWorks] TO DISK = N'C:Program FilesMicrosoft SQL N'C: Files ServerMSSQL10.SQL08DE01MSSQLBackupAdventureWorks4MirrorLog.bak' Server MSSQL10.SQL08DE01 MSSQL Backup GO -- Processed 1849 pages for database 'AdventureWorks', file 'AdventureWorks_Log' on file 1. 'AdventureWorks_Log' -- BACKUP LOG successfully processed 1849 pages in 0.862 seconds (16.757 MB/sec). (16.757
  22. 22. Restore to Mirror RESTORE FILELISTONLY FROM DISK = N'C:Program FilesMicrosoft SQL N'C: Files ServerMSSQL10.SQL08DE01MSSQLBackupAdventureWorks4Mirror.bak' Server MSSQL10.SQL08DE01 MSSQL Backup RESTORE DATABASE AdventureWorks FROM DISK = N'C:Program FilesMicrosoft SQL N'C: Files ServerMSSQL10.SQL08DE01MSSQLBackupAdventureWorks4Mirror.bak' Server MSSQL10.SQL08DE01 MSSQL Backup WITH NORECOVERY, MOVE 'AdventureWorks_Data' TO 'C:Program FilesMicrosoft SQL 'C: Files ServerMSSQL10.SQL08DE02MSSQLDATAAdventureWorks_Data.mdf', Server MSSQL10.SQL08DE02 MSSQL DATA MOVE 'AdventureWorks_Log' TO 'C:Program FilesMicrosoft SQL 'C: Files ServerMSSQL10.SQL08DE02MSSQLDATAAdventureWorks_Log.ldf' Server MSSQL10.SQL08DE02 MSSQL DATA GO -- Processed 17672 pages for database 'AdventureWorks', file 'AdventureWorks_Data' on file 1. 'AdventureWorks_Data' -- Processed 3 pages for database 'AdventureWorks', file 'AdventureWorks_Log' on file 1. 'AdventureWorks_Log' -- RESTORE DATABASE successfully processed 17675 pages in 6.716 seconds (20.560 MB/sec). seconds RESTORE LOG AdventureWorks FROM DISK = N'C:Program FilesMicrosoft SQL N'C: Files ServerMSSQL10.SQL08DE01MSSQLBackupAdventureWorks4MirrorLog.bak' Server MSSQL10.SQL08DE01 MSSQL Backup WITH FILE = 1, NORECOVERY; GO -- Processed 0 pages for database 'AdventureWorks', file 'AdventureWorks_Data' on file 1. 'AdventureWorks_Data' -- Processed 1849 pages for database 'AdventureWorks', file 'AdventureWorks_Log' on file 1. 'AdventureWorks_Log' -- RESTORE LOG successfully processed 1849 pages in 1.083 seconds (13.338 MB/sec).
  23. 23. 7 23 Copyright 2009 all rights reserved
  24. 24. 9 24 Copyright 2009 all rights reserved
  25. 25. 11 25 Copyright 2009 all rights reserved
  26. 26. 12 26 Copyright 2009 all rights reserved
  27. 27. 13 27 Copyright 2009 all rights reserved
  28. 28. 14 28 Copyright 2009 all rights reserved
  29. 29. SQL Server 2008 SQL Server 2008 Mirror Server 10 Principal AdventureWorks Server AdventureWorks DB DB translog translog Database Database Snapshot Snapshot becomes the mirror. If this server node SQL Server 2008 Witness rk rk s oo er MSDB DB tw Server tw Us Ne Ne g n rti po Re 29 Copyright 2009 all rights reserved
  30. 30. DB Mirroring 2005 versus DB Mirroring 2008 Benchmarks
  31. 31. Instance: SQL08DE01 Instance: SQL08DE02 Endpoint name: “EndPoint4DBMirroring1430” Endpoint name: “EndPoint4DBMirroring1440” Role: PARTNER Role: PARTNER Example 2008 SQL Server 2008 SQL Server Mirror Server Configuratio Principal Adventure Adventure n Works DB Works DB Server translog translog TCP: Listener_Port: 1430 TCP: Listener_Port: 1440 SQL Server 2008 Witness MSDB DB Server TCP: Listener_Port: 1450 Instance: SQL08DE03 Endpoint name: “EndPoint4DBMirroring1450” Role: WITNESS 31 Copyright 2009 all rights reserved
  32. 32. DB Mirroring 2005 Benchmarks Repl_rows stored procedure 9999999 Send Rate
  33. 33. DB Mirroring 2008 Benchmarks Send Rate 41% More
  34. 34. DB Mirroring 2005 Benchmarks Restore Rate
  35. 35. DB Mirroring 2008 Benchmarks Restore Rate 52% more
  36. 36. DB Mirroring 2005 Benchmarks
  37. 37. DB Mirroring 2005 Benchmarks
  38. 38. DB Mirroring 2008 Benchmarks
  39. 39. DB Mirroring 2008 Benchmarks
  40. 40. DB Mirroring Benchmark Summary Overall send rate 41 % faster (2005 vs 2008) Overall restore rate 52% faster (2005 vs 2008) Overall availability topology inherits the restore rate ~ 50% more available Example: 743 ms Transaction (in 2005 mirroring configuration) 379 ms Transaction (in 2008 mirroring configuration) In failover, what would have been 20 seconds before mirror becomes principal turns into roughly 8-10 seconds (or 3seconds turns into 1.5 seconds, so on). 40 Copyright 2009 all rights reserved
  41. 41. DB Mirroring 2008 Solid State Disks Benchmarks DB Mirroring 2008 Conventional Disk configuration (SCSI/Raid10) DB Mirroring 2008 Solid State Disk configuration (Stripping/Dynamic Volume) ** SSD’s courtesy of Solid Data corporation
  42. 42. Instance: SQL08DE01 Instance: SQL08DE02 Endpoint name: “EndPoint4DBMirroring1430” Endpoint name: “EndPoint4DBMirroring1440” Role: PARTNER Role: PARTNER SQL Server 2008 SQL Server 2008 Benchmark Mirror Server Configuration Principal Adventure Adventure Works DB Works DB Server translog translog TCP: Listener_Port: 1430 TCP: Listener_Port: 1440 SQL Server 2008 Witness MSDB DB Server TCP: Listener_Port: 1450 Instance: SQL08DE03 Endpoint name: “EndPoint4DBMirroring1450” Role: WITNESS 42 Copyright 2009 all rights reserved
  43. 43. DB Mirroring 2008 SSD Benchmarks
  44. 44. DB Mirroring 2008 Conventional Disk
  45. 45. Mirroring Conventional Disk Client Execution Time 5:11:59 AM Query Profile Statistics Number of transactions 100000 Network Statistics Number of server roundtrips 1 TDS packets sent from client 1 TDS packets received from server 4912 Bytes sent from client 92 Bytes received from server 20117100 Time Statistics Client processing time 622782 Total execution time 622953 Wait time on server replies 171 Conventional Disk DB Mirroring
  46. 46. DB Mirroring 2008 SSD
  47. 47. Send Rate 26% Faster Restore Rate 17% Faster
  48. 48. Mirroring Solid State Disk Client Execution Time 3:53:14 AM Query Profile Statistics Number of transactions 100000 Network Statistics Number of server roundtrips 1 TDS packets sent from client 1 TDS packets received from server 4951 Bytes sent from client 92 Bytes received from server 20277550 Time Statistics Client processing time 517844 Total execution time 517953 Wait time on server replies 109 For Mirroring execution SSD's TO SSD's
  49. 49. DB Mirroring SSD Benchmark Summary Overall send rate 26 % faster (2008 Conventional versus SSD) Overall restore rate 17% faster (2008 Conventional versus SSD) Overall db mirroring topology garners ~ 20% more availability 10 min 17 seconds to complete > 4:32:37am 4:43:00am (principal send’s) > 4:32:48 am 4:43:05am (mirror restore’s) 8 min 38 seconds to complete > 3:45:19am 3:53:20am (principal send’s) > 3:45:20am 3:53:20am (mirror restore’s) 100% Transparent (zero db & application changes) ! 50 Copyright 2009 all rights reserved
  50. 50. P&T Products Database Products SQL SuperVision – Sybase SQL SuperVision – Oracle SQL Shot – MS SQL Server
  51. 51. Snapshots 52 Copyright 2009 all rights reserved
  52. 52. Tr an s Us acti er on s al SQL Server 2008 01 AdventureWork Source CREATE DB ‘xyz’ s DB Server AS SNAPSHOT OF AdventureWorks translog Database Snapshot --- Reverting --- if needed --- RESTORE DB AdventureWorks FROM DATABASE_SNAPSHOT = ‘xyz’ d- U e y) s ea ing tim nl r O se (R rt in- po nt- Re Poi
  53. 53. Source Data Pages Source 02 SQL Server 2008 Sparse SQL Server File Pages Snapshot AdventureWork AdventureWork s DB s DB Empty Sparse file of a Snapshot just created (no updates to original data pages have occurred yet) 54 Copyright 2009 all rights reserved
  54. 54. Source Data Pages Source 03 SQL Server 2008 Sparse SQL Server File Pages Snapshot AdventureWork AdventureWork s DB s DB System Catalog Copy of original of changed pages pages for snapshot only when a page is changed (Copy-on-write) 55 Copyright 2009 all rights reserved
  55. 55. Snapshot Users Source Data Pages SELECT …..data……. FROM AdventureWorks SNAPSHOT 04 SQL Server 2008 SQL Server Snapshot AdventureWork AdventureWork s DB s DB System Catalog Sparse of changed pages File Pages 56 Copyright 2009 all rights reserved
  56. 56. Transactional Users Data Pages A C Update Row Committed SQL Server 2008 05 Sparse SQL Server File B Pages Snapshot AdventureWork B AdventureWork s DB s DB translog B System Catalog of changed pages Copy of original pages for snapshot use B only when a page is changed (Copy-on-write)
  57. 57. Us All er s SQL Server 2008 06 UPDATE AWSource.tableX AdventureWorks Source DB set xyz = … Server FROM AWSnapshot6:00AM.tableX translog Database 6:00AM Snapshot Snapshot Database 12:00PM Snapshot Snapshot Restore from Database 6:00PM Snapshot Snapshot Any Point-in-time Database 12:00AM Snapshot Snapshot if needed Snapshot
  58. 58. Us er Generating s Mass Changes SQL Server 2008 07 Source UPDATE AWSource.tableX AdventureWorks set xyz = … Server DB FROM AWSafegaurd6:00AM.tableX Database SAFEGUARD Snapshot Snapshot (Before the mass changes) Restore from snapshot (if changes are not correct)
  59. 59. Te Us stin er g s SQL Server 2008 08 Source AdventureWorks Server DB Database BEFORE TEST Snapshot Snapshot Restore from the BEFORE snapshot after testing cycle is complete and can continue with next test.
  60. 60. Tr an s Us act er ion s al Re Poi po nt-i (R rt n- e a i n g ti m d- U e O se SQL Server 2008 nl r s y) 09 AdventureWorks Source DB Server translog Database 6:00AM Reporting Snapshot Snapshot Database 12:00PM Reporting Snapshot Snapshot Database 6:00PM Reporting Snapshot Snapshot Database 12:00AM Reporting Snapshot Snapshot
  61. 61. SQL Server 2008 SQL Server 2008 Mirror Server 10 Principal AdventureWorks Server AdventureWorks DB DB translog translog Database Database Snapshot Snapshot becomes the mirror. If this server node SQL Server 2008 Witness rk rk s oo er MSDB DB tw Server tw Us Ne Ne g n rti po Re 62 Copyright 2009 all rights reserved
  62. 62. Instance: SQL2008xyz Endpoint Name: “endpoint4mirroring” Role: PARTNER PH Topology With Snapshots SQL Server 2008 Instance: SQL2008zzz Principal Endpoint Name: “endpoint4mirroring” Server Role: PARTNER OLTP Application SQL Server 2008 Active Mirror Server Clustered Replication Adventure Adventure Works DB Works DB translog translog Database Passive PH Snapshot Network Topology Network Principal Server SQL Server 2008 63 Reporting Users Copyright 2009 all rights reserved
  63. 63. DB Mirror and Publisher Replication SQL Server 2008 SQL Server 2008 Principal Mirror SQL Server 2008 Server Server Subscriber Distributor SQL Server 2008 SQL Server 2008 Principal Mirror Server Server SQL Server 2008 SQL Server 2008 Witness Server Subscriber 64 Copyright 2009 all rights reserved
  64. 64. Distributing Data Sites Data Access Latency Autonomy Frequency Network Machines Owner Other REPLICATION (locations) Each site only Read Only Central Publisher fast/ 1 Transactional repl short high many high 1 OLTP needs regional Reporting Database Mirroring stable server/site site filter by region data Each site only Read Only Central Publisher fast/ 1 Snapshot repl long high many low 1 OLTP needs regional Reporting Database Mirroring stable server/site site filter by region data Regional updates Central Publisher Read Mostly fast/ 1 Transactional repl A few updates short high < 10 medium 1 OLTP on one table stable server/site site Updating Subs Regional update Read Mostly Central Publisher slow/ 1 All Merge repl A few updates medium high < 10 medium all tables unreliab server/site update Regional update Read equal Peer-to-Peer fast/ 1 All Transactional Equal updates short high < 10 medium all tables stable server/site update repl Each site only Inserts 1 Central Subscriber fast/ 1 Transactional repl (new orders) short high many high needs regional stable server/site report data site Central Publisher Hot/Warm Very fast/ 1 Fail-over Remote Distributor high <2 high 1 OLTP Spare short stable server/site site Transactional repl Database Mirroring 65 Copyright 2009 all rights reserved
  65. 65. Questions Is there any time left???? Send your questions to: pbertucci@dbarchitechs.com or tgerardin@dbarchitechs.com Copyright 2009 all rights reserved
  66. 66. SQL Clustering basic configuration SQL CLUSTER1 Connections C: Local Binaries Windows 2003 EE MSCS Cluster Group Resources SQL Server 2008 (physical) MS DTC S: SQL Agent SQL Full Text Search Master DB SQL Server 2008 SCSI TempDB (Virtual SQL Server) Appl 1 DB VSQLSERVER2008 Quorum Q: Disk SQL Server 2008 (physical) MSCS Windows 2003 EE CLUSTER2 C: Local 67 Binaries Copyright 2009 all rights reserved

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