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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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Changing SGA and PGA sizes

Oracle instance is made up of background processes and the shared memory (SGA). The background processes perform the maintenance tasks that are required to keep the database running. These background processes operate on the allocated shared memory. For example, one of the background process (PMON) is responsible for cleaning up (releasing locks and resources) after abnormally terminated database connections.

There are two types of memory that Oracle instance allocates:

  • System Global Area (SGA): This is a shared memory area that contains database buffers, shared SQL and PL/SQL, and other control information for the instance.

  • Process Global Area (PGA): This memory is private to a single process. PGA keeps process-specific information such as Oracle shared resources being used by a process, operating system resources used by the process, and other database session related information.

Oracle Database XE uses Automatic Memory Management (AMM) . This means Oracle Database...

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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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