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Troubleshooting Waits for Locks / Enqueues Other than 'TM', 'TX' and 'UL' (Doc ID 1905157.1)

Last updated on AUGUST 04, 2018

Applies to:

Oracle Database - Enterprise Edition - Version 7.0.16.0 and later
Oracle Database - Personal Edition - Version 7.1.4.0 and later
Oracle Database - Standard Edition - Version 7.0.16.0 and later
Information in this document applies to any platform.

Purpose

This document provides information regarding locks other than the most common TM, TX and UL Enqueues.
For coverage of User Type Locks (TM, TX and UL Enqueues) refer to the information here:

Document 1392319.1 Master Note: Locks, Enqueues and Deadlocks (ORA-00060)

 

Scope

Intended Audience: All Database Administrators

Details

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In this Document
Purpose
Scope
Details
 System Enqueues other than TM, TX and UL Enqueues
 BF enqueue: 'enq: BF - contention'
 CF Controlfile Enqueue: 'enq: CF - contention'
 DW enqueue: 'enq: DW - contention'
 DX Distributed Transaction Enqueue: 'enq: DX - contention'
 FB Block Format Enqueue: 'enq: FB - contention'
 HW High Water Enqueue: 'enq: HW - contention'
 JS Job Scheduler Enqueue: 'enq: JS - queue lock'
 PS Parallel Execution Server Process reservation and synchronization enqueue: 'enq: PS - contention'
 RO Fast Object Reuse Enqueue: 'enq: RO - fast object reuse'
 SQ Sequence Cache Enqueue: 'enq: SQ - contention'
 SS Sort Segment Enqueue: 'enq: SS - contention'
 ST Space Transaction Enqueue: 'enq: ST - contention'
 TO Temporary Table Object Enqueue: 'enq: TO - contention'
 TS Temporary Table Object Enqueue: 'enq: TS - contention'
 TT Tablespace Operations Enqueue: 'enq: TT - contention'
 US Undo Segment Enqueue: 'enq: US - contention'
References

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