Oracle Database In-Memory Advisor (English)

Copyright © 2015 Oracle and/or its affiliates. All rights reserved. |

Ileana Someşan Senior PreSales Consultant Core Technology

Oracle Database In-Memory Advisor English version

Ileana Someşan


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


• 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


• 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


• 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


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


• 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


• 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


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

https://support.oracle.com/epmos/faces/DocumentDisplay?id=1965343.1


• 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


• 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


Thanks! Questions?

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Copyright © 2015 Oracle and/or its affiliates. All rights reserved. | Ileana Someşan 18

Date post:	15-Jul-2015
Category:	Data & Analytics
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Oracle Database In-Memory Advisor (English)

Data & Analytics