Log sequence out of order
归档重做日志以非顺序方式在备库上接收或注册。这会中断应用进程。
SELECT sequence#, first_time, applied FROM v$archived_log ORDER BY sequence# DESC FETCH FIRST 20 ROWS ONLY;SELECT thread#, low_sequence#, high_sequence# FROM v$archive_gap;SELECT process, status, sequence# FROM v$managed_standby;