How to Identify Which Latch is Associated with a "latch free" wait
(Doc ID 413942.1)
Last updated on APRIL 15, 2021
Applies to:Oracle Database - Enterprise Edition - Version 184.108.40.206 and later
Oracle Database - Personal Edition - Version 220.127.116.11 and later
Oracle Database - Standard Edition - Version 18.104.22.168 and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
It is important to identify which latch is associated with latch free waits when tuning a database for latch waits.
For versions prior to 10g, there is an umbrella wait event called latch free that covers all latch waits. The specific latch or latches involved must be determined from either a 10046 trace (and TKProf) or from a statspack report. This note will show you how to determine which latch or latches are associated with the latch free event.
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