This presentation describes the Oracle Database In-Memory Advisor, which is an easy tool to evaluate the benefit of 12c In-Memory Option in your environment. It also provides you with recommendations on the optimal configuration of Oracle Database In-Memory.

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Ileana Someşan
Senior PreSales Consultant Core Technology
Oracle Database In-Memory Advisor
English version
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Oracle Database In-Memory Option
Brief introduction
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• Add-on to the Oracle Database
– Available in release 12.1.0.2+
– On all hardware platforms certified for Oracle DB
• New way of organizing and processing data in memory
– Goal: real-time analytics
Overview
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In-Memory Option

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• Extreme acceleration of data
warehousing, analytics, reporting
– Factor 100
• Faster OLTP
– In mixed workload environments
(operational + reporting)
– Column Store replaces analytical indexes
removing maintenance overhead
• Easy to implement
• Full control over the objects that are
populated into memory
– Only performance-critical data, not entire
database
• No application changes
• Fully integrated with pre-existing Oracle
DB technologies
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In-Memory Option
Benefits
Advisor

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• Dual-format data representation
in memory
– Row and column format
– Transactionally consistent
• OLTP uses traditional row format
– Best at frequent inserts/updates/deletes
• Analytic queries use new column format
– Best at data scans/filtering/aggregation
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Oracle Database with In-Memory Option
Memory
(SGA)
Row Format
Traditional
Buffer Cache
Disk
Row Format
SALES
New In-Memory
Column Store
SALES
Column Format

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• Installed automatically with the DB, but not enabled
• Set the size of the In-Memory Column Store
•
• Specify objects to be populated into the In-Memory Column Store
• Oracle Optimizer automatically uses the In-Memory Column Store
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How to enable & use
alter system set inmemory_size = XXX G scope=spfile;
shutdown immediate;
startup;
alter table XXX … inmemory; Advisor
Advisor

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Oracle Database In-Memory Advisor
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• Goal:
– Estimate the benefit of In-Memory Option for a specific DB
– Advise on optimal configuration of In-Memory Option
• Easy to install and run
• Can be run on Oracle DB 11.2.0.3+
– Recommendations can be implemented in Oracle DB 12.1.0.2+
Overview
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In-Memory Advisor

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• Identifies the analytic workload in your DB
– From Automatic Workload Repository (AWR) and Active Session History (ASH)
• Produces results based on...
– Current database statistics
– Assumptions and heuristic parameter settings, e.g. performance improvement by eliminating waits,
compression/decompression costs
• Advisor results are estimates
– Does not use In-Memory Option
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How it works

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• HTML Report
– Recommendations:
size of In-Memory Column Store,
objects that should be placed In-Memory for maximum benefit,
compression type
– Expected performance improvement and time saving
• SQL script
– Quickly implement Advisor recommendations
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Output

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• License for Diagnostics Pack and Tuning Pack
• Oracle DB release 11.2.0.3+
• Traditional (Non CDB) architecture
– 12c Multitenant environenment not yet supported
• Analytic workload
• Up to date database statistics
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Prerequisits

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1. Download ZIP archive from My Oracle Support
– Support Note 1965343.1
2. Unpack ZIP archive
3. Run provided installation script
– Guides you through installation
– Creates: DB-User IMADVISOR, Package DBMS_INMEMORY_ADVISOR, Oracle directory
IMADVISOR_DIRECTORY
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Installation
$ sqlplus sys/<pw> as sysdba
SQL> @instimadv

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• Run provided SQL-Skript
– Or write your own
– Task Name
– Begin time und duration of analyzed workload
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Execution
$ sqlplus sys/<pw> as sysdba
SQL> @imadvisor_analyze_and_report

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• Run Advisor on relevant DB workload
– E.g. end of month with intense reporting activity
• Advisor does not run in realtime
– Investigates previous DB activity
• Time frame (duration) of the analysis
– 1 h oder longer, depending on your DB workload
• Overhead for running the Advisor
– Little, similar to other DB-Advisors
– Can be eliminated by loading DB-Statistics into another database
• SQL Performance Analyzer to validate recommendations
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Hints for In-Memory Advisor

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Thanks!
Questions?
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ileana.somesan@oracle.com
http://de.slideshare.net/somesan

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