This document discusses managing indexes in a database. It describes different types of indexes like B-tree and bitmap indexes and how to create, reorganize, and drop indexes. It also covers getting index information from the data dictionary and guidelines for optimizing index performance and storage.
bis 155 week 3 quiz data analysis with spreadsheets with lab,bis 155,bis 155 entire course,bis 155 devry,devry bis 155,bis 155 ilabs,bis 155 exercise, bis 155 final exam,devry bis 155 course project,bis155 week 3 ilab,bis 155 week 3 quiz
Oracle Database In-Memory introduces a number of new features in the query optimizer. The aim of this presentation is to describe and demonstrate how they work.
Indexing Strategies for Oracle Databases - Beyond the Create Index StatementSean Scott
There's more to indexing than the basic "create index" statement! We'll go under the covers and look at the different types of indexes available in both Enterprise and Standard Editions, including b-tree, bitmap, reverse-key, functional, composite and partitioned; describe how to select the most appropriate type of index for a particular situation; explore storage parameters and lesser-known configuration options available to fine-tune performance; discuss methods for gathering statistics, including whether to capture histograms or not; and cover techniques for managing and maintaining a healthy library of indexes. Scripts included!
1. How to choose the appropriate type of index for a particular implementation.
2. An understanding of indexing options and storage configurations available to improve index (and database) performance.
3. Techniques for managing and maintaining the health of indexes.
bis 155 week 3 quiz data analysis with spreadsheets with lab,bis 155,bis 155 entire course,bis 155 devry,devry bis 155,bis 155 ilabs,bis 155 exercise, bis 155 final exam,devry bis 155 course project,bis155 week 3 ilab,bis 155 week 3 quiz
Oracle Database In-Memory introduces a number of new features in the query optimizer. The aim of this presentation is to describe and demonstrate how they work.
Indexing Strategies for Oracle Databases - Beyond the Create Index StatementSean Scott
There's more to indexing than the basic "create index" statement! We'll go under the covers and look at the different types of indexes available in both Enterprise and Standard Editions, including b-tree, bitmap, reverse-key, functional, composite and partitioned; describe how to select the most appropriate type of index for a particular situation; explore storage parameters and lesser-known configuration options available to fine-tune performance; discuss methods for gathering statistics, including whether to capture histograms or not; and cover techniques for managing and maintaining a healthy library of indexes. Scripts included!
1. How to choose the appropriate type of index for a particular implementation.
2. An understanding of indexing options and storage configurations available to improve index (and database) performance.
3. Techniques for managing and maintaining the health of indexes.
Watch the full webinar at: http://embt.co/1pb4Zb4
This presentation is a must-see for anyone interested in Oracle 12! Dan is an Oracle ACE Director and has assembled this presentation with fresh and inside information from Oracle Corp and OOW13. Dan has pulled his top Oracle 12 features from the plethora of new features available and documented in his user group presentations "Oracle 12c New Features for Developers" and "Oracle 12c New Features for DBA's".
Top 10 features will include:
New SQL Syntax
New SQL and PL/SQL Limits
Pluggable Database
New Packages
Deprecated Features
New SQL Tuning Features
This presentation covers new SQL & PL/SQL syntax and options, the container DB of course, new SQL optimizer features, deprecated features, hints, and more. If you're supporting applications, then you won't want to miss this webinar!
Performance Tuning Oracle's BI ApplicationsKPI Partners
http://www.kpipartners.com/webinar-Performance-Tuning-Oracle-BI-Applications/ ... From a virtual event that discusses techniques that can be used to optimize performance of the Oracle BI Apps.
The BI Apps from Oracle present customers with a nice head start to getting their BI environment up and running. But for many customers, their user community demands lighting-fast speeds while running dashboards, reports and ad-hoc queries. Learn about some of the key techniques you can use to take the BI Apps to performance levels you didn’t think were possible.
The discussion begins with a conceptual understanding of why performance problems can exist and the counteracting design considerations. Special attention will be paid to the concept of a Performance Layer, describing what it is, what it is comprised of and how to build it. The presentation includes several real world examples of the significant performance gains that can be had from a Performance Layer.
Objective 1: Learn about the concept of a performance layer and what is involved with building one.
Objective 2: Understand the most important steps to improve the performance of your system.
Transform Financial Reporting Using Master Row Sets in Oracle E-Business Suiteeprentise
If you spend WAY too much time writing – and rewriting – Financial Statement Generator (FSG) reports, find out how using the Master Row Set will allow you to reduce that time from days to under an hour. The Master Row Set is a super set of all the rows in all your reports, and includes the attributes or characteristics of every row and row set into a single, super report. You save time while providing agility and consistency. Learn the secrets to keeping Financial Statement Generator reports to a minimum.
Improve speed & performance of informix 11.xx part 1am_prasanna
A presentation deck, that takes a deep dive on configuration parameters of IBM Informix database server, enhancing the Performance and thus boosting the speed with which, one can work with Informix DB. The presentation is split into two parts, i.e Part 1 and 2
Advanced PL/SQL Optimizing for Better Performance 2016Zohar Elkayam
This is the presentation I used for Oracle Week 2016 session. This includes new features from both 12cR1 and 12cR2.
Agenda:
Developing PL/SQL:
- Composite datatypes, advanced cursors, dynamic SQL, tracing, and more…
Compiling PL/SQL:
- dependencies, optimization levels, and DBMS_WARNING
Tuning PL/SQL:
- GTT, Result cache and Memory handling
- Oracle 11g, 12cR1 and 12cR2 new useful features
- SQLcl – New replacement tool for SQL*Plus (if we have time)
15 Ways to Kill Your Mysql Application Performanceguest9912e5
Jay is the North American Community Relations Manager at MySQL. Author of Pro MySQL, Jay has also written articles for Linux Magazine and regularly assists software developers in identifying how to make the most effective use of MySQL. He has given sessions on performance tuning at the MySQL Users Conference, RedHat Summit, NY PHP Conference, OSCON and Ohio LinuxFest, among others.In his abundant free time, when not being pestered by his two needy cats and two noisy dogs, he daydreams in PHP code and ponders the ramifications of __clone().
Watch the full webinar at: http://embt.co/1pb4Zb4
This presentation is a must-see for anyone interested in Oracle 12! Dan is an Oracle ACE Director and has assembled this presentation with fresh and inside information from Oracle Corp and OOW13. Dan has pulled his top Oracle 12 features from the plethora of new features available and documented in his user group presentations "Oracle 12c New Features for Developers" and "Oracle 12c New Features for DBA's".
Top 10 features will include:
New SQL Syntax
New SQL and PL/SQL Limits
Pluggable Database
New Packages
Deprecated Features
New SQL Tuning Features
This presentation covers new SQL & PL/SQL syntax and options, the container DB of course, new SQL optimizer features, deprecated features, hints, and more. If you're supporting applications, then you won't want to miss this webinar!
Performance Tuning Oracle's BI ApplicationsKPI Partners
http://www.kpipartners.com/webinar-Performance-Tuning-Oracle-BI-Applications/ ... From a virtual event that discusses techniques that can be used to optimize performance of the Oracle BI Apps.
The BI Apps from Oracle present customers with a nice head start to getting their BI environment up and running. But for many customers, their user community demands lighting-fast speeds while running dashboards, reports and ad-hoc queries. Learn about some of the key techniques you can use to take the BI Apps to performance levels you didn’t think were possible.
The discussion begins with a conceptual understanding of why performance problems can exist and the counteracting design considerations. Special attention will be paid to the concept of a Performance Layer, describing what it is, what it is comprised of and how to build it. The presentation includes several real world examples of the significant performance gains that can be had from a Performance Layer.
Objective 1: Learn about the concept of a performance layer and what is involved with building one.
Objective 2: Understand the most important steps to improve the performance of your system.
Transform Financial Reporting Using Master Row Sets in Oracle E-Business Suiteeprentise
If you spend WAY too much time writing – and rewriting – Financial Statement Generator (FSG) reports, find out how using the Master Row Set will allow you to reduce that time from days to under an hour. The Master Row Set is a super set of all the rows in all your reports, and includes the attributes or characteristics of every row and row set into a single, super report. You save time while providing agility and consistency. Learn the secrets to keeping Financial Statement Generator reports to a minimum.
Improve speed & performance of informix 11.xx part 1am_prasanna
A presentation deck, that takes a deep dive on configuration parameters of IBM Informix database server, enhancing the Performance and thus boosting the speed with which, one can work with Informix DB. The presentation is split into two parts, i.e Part 1 and 2
Advanced PL/SQL Optimizing for Better Performance 2016Zohar Elkayam
This is the presentation I used for Oracle Week 2016 session. This includes new features from both 12cR1 and 12cR2.
Agenda:
Developing PL/SQL:
- Composite datatypes, advanced cursors, dynamic SQL, tracing, and more…
Compiling PL/SQL:
- dependencies, optimization levels, and DBMS_WARNING
Tuning PL/SQL:
- GTT, Result cache and Memory handling
- Oracle 11g, 12cR1 and 12cR2 new useful features
- SQLcl – New replacement tool for SQL*Plus (if we have time)
15 Ways to Kill Your Mysql Application Performanceguest9912e5
Jay is the North American Community Relations Manager at MySQL. Author of Pro MySQL, Jay has also written articles for Linux Magazine and regularly assists software developers in identifying how to make the most effective use of MySQL. He has given sessions on performance tuning at the MySQL Users Conference, RedHat Summit, NY PHP Conference, OSCON and Ohio LinuxFest, among others.In his abundant free time, when not being pestered by his two needy cats and two noisy dogs, he daydreams in PHP code and ponders the ramifications of __clone().
2. Objectives
After completing this lesson, you should be able to
do the following:
• List the different types of indexes and their uses
• Create B-tree and bitmap indexes
• Reorganize indexes
• Drop indexes
• Get index information from the data dictionary
3. Classification of Indexes
• Logical
– Single column or concatenated
– Unique or nonunique
– Function-based
• Physical
– Partitioned or nonpartitioned
– B-tree
– Normal or reverse key
– Bitmap
4. B-Tree Index
Index entry header
Key column length
Key column value
ROWID
Root
Branch
Leaf
Index entry
5. KEY ROWID
ID (BLOCK# ROW# FILE#)
----- -------------------
1257 0000000F.0002.0001
2877 0000000F.0006.0001
4567 0000000F.0004.0001
6657 0000000F.0003.0001
8967 0000000F.0005.0001
9637 0000000F.0001.0001
9947 0000000F.0000.0001
... ...
... ...
Reverse Key Index
Index on EMPLOYEE (ID) EMPLOYEE table
ID FIRST_NAME JOB
----- ---------- --------
7499 ALLEN SALESMAN
7369 SMITH CLERK
7521 WARD SALESMAN
7566 JONES MANAGER
7654 MARTIN SALESMAN
7698 BLAKE MANAGER
7782 CLARK MANAGER
… ... ... ...
... ... ... ...
6. Creating Function-Based Indexes
• Dramatically improves query performance
• Queries using expressions can use the index
CREATE INDEX summit.item_quantity_to_deliver_idx
ON summit.item(quantity - quantity_shipped);
SELECT ord_id, item_id
FROM ITEM
WHERE (quantity - quantity_shipped) > 0;
8. Comparing B-Tree and
Bitmap Indexes
B-tree
Suitable for high-cardinality
columns
Updates on keys relatively
inexpensive
Inefficient for queries
using OR predicates
Useful for OLTP
Bitmap
Suitable for low-cardinality
columns
Updates to key columns very
expensive
Efficient for queries
using OR predicates
Useful for data warehousing
9. Creating Normal B-Tree Indexes
CREATE INDEX summit.employee_last_name_idx
ON summit.employee(last_name)
PCTFREE 30
STORAGE(INITIAL 200K NEXT 200K
PCTINCREASE 0 MAXEXTENTS 50)
TABLESPACE indx;
10. Creating Indexes: Guidelines
• Balance query and DML needs
• Place in separate tablespace
• Use uniform extent sizes: Multiples of five blocks
or MINIMUM EXTENT size for tablespace
• Consider NOLOGGING for large indexes
• Set high PCTFREE if new key values are likely to
be within the current range
11. Creating Reverse Key Indexes
CREATE UNIQUE INDEX summit.orders_id_idx
ON summit.orders(id) REVERSE
PCTFREE 30
STORAGE(INITIAL 200K NEXT 200K
PCTINCREASE 0 MAXEXTENTS 50)
TABLESPACE indx;
12. Creating Bitmap Indexes
Use the parameter CREATE_BITMAP_AREA_SIZE to
specify the amount of memory allocated for bitmap
creation.
CREATE BITMAP INDEX orders_region_id_idx
ON summit.orders(region_id)
PCTFREE 30
STORAGE(INITIAL 200K NEXT 200K
PCTINCREASE 0 MAXEXTENTS 50)
TABLESPACE indx;
13. Changing Storage Parameters for
Indexes
ALTER INDEX summit.employee_last_name_idx
STORAGE(NEXT 400K
MAXEXTENTS 100);
14. Allocating and Deallocating Index
Space
ALTER INDEX summit.orders_region_id_idx
ALLOCATE EXTENT (SIZE 200K
DATAFILE ‘/DISK6/indx01.dbf’);
ALTER INDEX summit.orders_id_idx
DEALLOCATE UNUSED;
15. Rebuilding Indexes
Use the ALTER INDEX command to:
• Move an index to a different tablespace
• Improve space utilization by removing deleted
entries
• Change a reverse key index to a normal B-tree
index and vice versa
ALTER INDEX summit.orders_region_id_idx REBUILD
TABLESPACE indx02;
16. Online Rebuild of Indexes
Rebuilding indexes can be done with minimal table
locking.
ALTER INDEX summit.orders_id_idx REBUILD ONLINE;
18. Dropping Indexes
• Drop and re-create an index before bulk loads.
• Drop indexes that are infrequently needed and build
them when necessary.
• Drop and re-create invalid indexes.
DROP INDEX summit.deptartment_name_idx;
20. Summary
In this lesson, you should have learned how to:
• Create different types of indexes
• Reorganize indexes
• Drop indexes
• Get index information from the data dictionary