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SMON - Free Space Coalescing (Doc ID 175128.1)

Last updated on OCTOBER 01, 2024

Applies to:

Oracle Database - Enterprise Edition - Version 9.0.1.0 and later
Information in this document applies to any platform.

Purpose

Since the introduction of the unlimited extents feature in Oracle, it is possible for SMON to have to coalesce a large number of free extents. This can manifest itself by SMON appearing to spin, consuming a high percentage of CPU for long periods. This article explains what is happening, and what (if anything) can be done.

Scope

 This article is intended to assist DBAs encountering SMON appearing to spin and consume high percentages of CPU by providing an understanding of the issues

Details

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