7/15/2023 0 Comments Oracle enqueue waits![]() For more information about Oracle (NYSE:ORCL), visit. Oracle offers a comprehensive and fully integrated stack of cloud applications and platform services. Also Oracle waits for the TM lock until it is either granted or the request times out or deadlock detection occurs for TM locks. My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts. The most common reason for waits on TM locks tend to involve Foreign Key constraints where the constrained columns are not indexed. US Undo Segment Enqueue: 'enq: US - contention' ![]() TT Tablespace Operations Enqueue: 'enq: TT - contention' TS Temporary Table Object Enqueue: 'enq: TS - contention' TO Temporary Table Object Enqueue: 'enq: TO - contention' ST Space Transaction Enqueue: 'enq: ST - contention' SS Sort Segment Enqueue: 'enq: SS - contention' When a session waits on an enqueue wait event, that session is waiting for a lock that is held by a different session. SQ Sequence Cache Enqueue: 'enq: SQ - contention' When we see an enqueue wait event in an Oracle database, the chances are that there is some thing locking or holding up some sessions from executing their SQL statements. RO Fast Object Reuse Enqueue: 'enq: RO - fast object reuse' PS Parallel Execution Server Process reservation and synchronization enqueue: 'enq: PS - contention' JS Job Scheduler Enqueue: 'enq: JS - queue lock' HW High Water Enqueue: 'enq: HW - contention' System Enqueues other than TM, TX and UL EnqueuesĬF Controlfile Enqueue: 'enq: CF - contention'ĭX Distributed Transaction Enqueue: 'enq: DX - contention'įB Block Format Enqueue: 'enq: FB - contention' ![]() Well, a lot has changed in 11g including the enqueue waits. To view full details, sign in with your My Oracle Support account.ĭon't have a My Oracle Support account? Click to get started! Oracle 11g R2 enqueue waits Decem Gerald Over 1 and a half year ago I posted the enqueue waits for Oracle 10g. (threshold 70) : heartbeat state 0x11.00 (cfio) pso-flag 0x0 : waiting for event control file parallel write for 0 secs with waitid 11755069. Intended Audience: All Database Administrators Details Sign In ORA-29770: global enqueue process LGWR (OSID 350888) is hung for more than 70 seconds LGWR (ospid: 350888) has no heartbeats for 84 sec. Document 1392319.1 Primary Note: Locks, Enqueues and Deadlocks (ORA-00060)
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