My Oracle Support Banner

Hugepages are Not used by Database Buffer Cache (Doc ID 829850.1)

Last updated on JANUARY 30, 2022

Applies to:

Oracle Database - Enterprise Edition - Version and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Linux x86


Following the steps in <Note 748637.1> you have configured your Linux for Very Large Memory with HugePages.
As described on <Note 749851.1> you have MEMORY_TARGET & MEMORY_MAX_TARGET initialization parameters disabled as the use of 11g Automatic Memory Management (AMM) is incompatible with HugePages.
Your SGA size is less then the size of the HugePages_Total (HugePages_Total*Hugepagesize)
But despite this the HugePages are not used by the database buffer cache.

Here I would like to show you an example of a possible scenario:

Suppose to have a RDBMS instance ASM enabled:




To view full details, sign in with your My Oracle Support account.

Don't have a My Oracle Support account? Click to get started!

In this Document

My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.