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How to Configure RHEL5 / Oracle Linux 5 32-bit for Very Large Memory with ramfs and HugePages (Doc ID 748637.1)

Last updated on JUNE 02, 2021

Applies to:

Oracle Database Backup Service - Version N/A and later
Oracle Database Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Version N/A and later
Linux OS - Version Oracle Linux 5.0 to Oracle Linux 5.11 with Unbreakable Enterprise Kernel [2.6.39] [Release OL5 to OL5U11]
Oracle Database - Enterprise Edition - Version and later
Linux x86


This document aims to guide Linux system administrators on RedHat and Oracle Linux 5 32-bit to configure Very Large Memory and big SGA for Oracle RDBMS with ramfs and hugepages. Note that the term VLM (Very Large Memory) refers to the specific code implementation in Oracle Database using the USE_INDIRECT_DATA_BUFFERS initialization parameter.

Using the this method the SGA can be as nearly large as the pysical RAM where limits are provided in <Document 300652.1>. Keep in mind that Linux OS services would need memory too. See Oracle Database product documentation for more information.

The configuration provided in this document applies strictly to 32-bit Linux. For HugePages on 64-bit Linux, see <Document 361468.1>


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