My Oracle Support Banner

Primary Note: Database System Monitor Process (SMON) (Doc ID 1495163.1)

Last updated on AUGUST 23, 2021

Applies to:

Oracle Database - Enterprise Edition - Version and later
Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.


 To have an overview of SMON process and its functions


 Applies to Non RAC environment


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
 Instance Recovery
 When Oracle Database Performs Instance Recovery
 Instance Recovery Phases
 Cache Recovery
 Transaction Recovery
 Temporary Segment Cleanup
 When does SMON cleanup temporary segments?
 Temporary Segments in a Permanent Tablespace
 Temporary Segments in a Temporary Tablespace
 How to identify whether SMON is cleaning up temporary extents ?
 Effects on Database
 Force Temp Segment cleanup
 Free Space COALESCE

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