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You're reading from  Oracle Database XE 11gR2 Jump Start Guide

Product typeBook
Published inJul 2012
Reading LevelIntermediate
PublisherPackt
ISBN-139781849686747
Edition1st Edition
Languages
Java
Tools
Oracle Database
Concepts
Database Programming
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Author (1)
Asif Momen
Asif Momen
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Asif Momen

Asif Momen has been working with Oracle technologies for over 12 years and has expertise in Database Architecture, Performance Tuning, and High Availability. He has a Master's degree in Software Systems from Birla Institute of Technology & Science (BITS), Pilani. Asif is honored by the prestigious Oracle ACE award from Oracle Technology Network. He has the following certifications: OCP 11g DBA, OCP 9i Forms Developer and is an Oracle Certified Expert in RAC 10g. Asif is a presenter for conferences like Oracle OpenWorld-2010, All India Oracle User Group (AIOUG), and Brain Surface. In addition, he is the Member of Editorial Board of "Oracle Connect"the quarterly publication of AIOUG and Select magazine of the United Kingdom Oracle User Group (UKOUG) His articles have also appeared in Oracle Support - Customer Knowledge Exchange . His particular interests are Database & SQL tuning, Oracle RAC and Backup & Recovery. He posts his ideas and opinions on The Momen Blog (http://momendba.blogspot.com). Asif can be reached at asif.momen@gmail.com.
Read more about Asif Momen

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Automatic Memory Management

Oracle Database 11g XE uses the Automatic Memory Management (AMM) feature that simplifies SGA and PGA memory management significantly. The MEMORY_TARGET initialization parameter is used to automatically manage memory needs. When the MEMORY_TARGET parameter is set, Oracle Database 11g XE automatically sizes various memory components such as database buffer cache, Java pool, shared pool, streams pool, large pool, and process global area.

You cannot disable AMM in Oracle Database XE configuration. The MEMORY_TARGET parameter by default is set to 1 GB when you install Oracle Database XE. Oracle Database 11g XE includes four new views to support automatic memory management:

  • V$MEMORY_CURRENT_RESIZE_OPS

  • V$MEMORY_DYNAMIC_COMPONENTS

  • V$MEMORY_RESIZE_OPS

  • V$MEMORY_TARGET_ADVICE

The amount of memory allocated to each dynamic component is displayed using the V$MEMORY_DYNAMIC_COMPONENTS view, as shown in the following command:

SQL> SELECT * FROM v$memory_dynamic_components...
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Oracle Database XE 11gR2 Jump Start Guide
Published in: Jul 2012Publisher: PacktISBN-13: 9781849686747
© 2012 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Asif Momen

Asif Momen has been working with Oracle technologies for over 12 years and has expertise in Database Architecture, Performance Tuning, and High Availability. He has a Master's degree in Software Systems from Birla Institute of Technology & Science (BITS), Pilani. Asif is honored by the prestigious Oracle ACE award from Oracle Technology Network. He has the following certifications: OCP 11g DBA, OCP 9i Forms Developer and is an Oracle Certified Expert in RAC 10g. Asif is a presenter for conferences like Oracle OpenWorld-2010, All India Oracle User Group (AIOUG), and Brain Surface. In addition, he is the Member of Editorial Board of "Oracle Connect"the quarterly publication of AIOUG and Select magazine of the United Kingdom Oracle User Group (UKOUG) His articles have also appeared in Oracle Support - Customer Knowledge Exchange . His particular interests are Database & SQL tuning, Oracle RAC and Backup & Recovery. He posts his ideas and opinions on The Momen Blog (http://momendba.blogspot.com). Asif can be reached at asif.momen@gmail.com.
Read more about Asif Momen

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