Oracle 19c hang ‘TTnn Sleep 10 seconds and then try to clear SRLs in N time(s)’ wait ‘row cache lock’ & ‘cursor: pin S wait on X’

  • 2021/12/28
  • Cloud, ORACLE 9i-23ai
  • 1,301 views
  • Oracle 19c hang ‘TTnn Sleep 10 seconds and then try to clear SRLs in N time(s)’ wait ‘row cache lock’ & ‘cursor: pin S wait on X’已关闭评论

环境oracle 19c(19.7) on linux, 数据库做了failover后在open resetlogs数据库时，等待了很久的时间，数据库里查询wait event是’row cache lock’ & ‘cursor: pin S wait on X’， DB alert log显示下面的信息:可以看到不断的在输出TTnn Sleep 10 seconds and then try to clear SRLs in N time(s)， TTnn进程为异步模式下的REDO传输进程， 在清理standby redo log时hang, 还出现了row cache enqueue生成了SSD（system state dump）trace

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Troubleshooting wait event :cursor: pin S wait on X

  • 2011/11/30
  • ORACLE 9i-23ai
  • 2,726 views
  • Troubleshooting wait event :cursor: pin S wait on X已关闭评论

从oracle10g(10.2.0.2)开始 ，开始启用mutex来替换以前的library cache bin latch，这是一种os级更低层的轻量级锁，但是也不是那么完美，有时会出现events cursor: pin S wait on X

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