10g Data Guard physical standby的Bug 5526409(Fail to queue the whole FAL gap)

用duplicate創建完成physical standby之後，在standby上使用alter database recover managed standby database disconnect from session正準備同步日誌時，主庫與備庫的alert日誌中均出現以下：

primary

----------------------------------------------------

FAL[server]: Fail to queue the whole FAL gap
 GAP - thread 1 sequence 8-8
 DBID 155176457 branch 743338121

 

standby

-----------------------------------------------------

FAL[client]: Failed to request gap sequence
 GAP - thread 1 sequence 8-8
 DBID 155176457 branch 743338121
FAL[client]: All defined FAL servers have been attempted.

根據以上的錯誤提示，初步判斷為出現了gap，那就看看究竟是哪裡斷了日誌而產生的gap。但是在主庫與備庫上均提示未出現gap，結果如下：

select * from v$archive_gap;

no rows selected