My Oracle Support Banner

Oracle Linux: Startup Error ORA-27123: Unable To Attach To Shared Memory Segment Linux-x86_64 Error: 22: Invalid argument (Doc ID 1607545.1)

Last updated on FEBRUARY 16, 2023

Applies to:

Linux OS - Version Oracle Linux 6.2 with Unbreakable Enterprise Kernel [2.6.32] to Oracle Linux 6.2 with Unbreakable Enterprise Kernel [2.6.32] [Release OL6U2]
Oracle Cloud Infrastructure - Version N/A and later
Linux x86-64
Review currency at 25th.May 2015


The below error is received while trying to start Database on Linux node:

The above condition will not be suitable as the SGA size is only 3Gb, and HugePages defined is 5Gb and the maximum shared memory defined is 68Gb ( shmmax )



Setting the Hugepagesize value


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.