Enqueue enq:WL WL Enqueue等待事件

该Enqueue enq:WL WL Enqueue 队列等待的资源是用来锁定指定的online redo log在线日志文件,其在下列操作时被使用:

  • 当增加一个新的成员到一个日志组
  • 当从日志组中移出一个日志文件
  • 当在清理日志文件内容时
  • 当重命名一个日志文件
  • 当在归档一个日志文件

其ID1 和 ID2的可能的含义:

Log number (id1) ,零(id2)

Redo thread (id1),log sequence number (id2)

Redo thread (id1),log sequence number (id2) but id1’s high order bit is set (The “1<<16” th bit) when we are performing a logical standby related operation


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