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Auto-Adjustment of LMS Process Priority in Oracle RAC with 11.2.0.3 and later (Doc ID 1392248.1)

Last updated on FEBRUARY 07, 2019

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.3 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.

Purpose

Starting with Oracle Database 11g Release 2, the process priority for LMS processes will be adjusted by the Oracle Real Application Clusters (RAC) stack in accordance to the number of cores (also referred to as 'physical CPUs' as opposed to 'threads') in the server. The goal is to keep the number of LMS real time (RT) processes equal to or lower compared to the number of cores in the server. This note explains the background of this feature and its implementation details.

Scope

The auto-adjustment of the LMS process will only affect Oracle database and Automatic Storage Management (ASM) instances of version 11.2.0.3 or later, which assumes an 11.2.0.3 Oracle Grid Infrastructure. Customers planning to upgrade to Oracle RAC 11.2.0.3 should read this note in order to determine the impact of this feature, which should mainly affect consolidated Oracle RAC database environments.

Details

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