檢查Data Guard 主庫，發現log有如下資訊：

Wed Oct 13 17:05:11 2010

RFS: Possible network disconnect with primary database

RFS: Destination database mount ID mismatch [0x4b1b0155:0x4b1b40c1]

RFS: client instance is standby database instead of primary

RFS: Not using real application clusters

檢視備庫，也有相關資訊：

KUP-04021: field formatting error for field TEXT

KUP-04023: field start is after end of record

KUP-04101: record 989 rejected in file D:/oracle/admin/orcl/bdump/alert_orcl.log

KUP-04021: field formatting error for field TEXT

KUP-04023: field start is after end of record

KUP-04101: record 1038 rejected in file D:/oracle/admin/orcl/bdump/alert_orcl.log

Oracle 的解釋：

Symptoms

Standby alert log reports "RFS: Possible network disconnect with primary database"

At the standby DB side I get this error every minute.

RFS: Possible network disconnect with primary database

Standby database ID mismatch [0xAAAA:0xBBBBB]

Archive log transfer/apply works O.K.

Cause

The (error) message may be triggered by another database thathas log_archive_dest_2 pointing to standby instance of (error) message .

RFS process tries to communicate with the instance.

Solution

Check if you have DB with mismatched ID and itslog_archive_dest_X parameter value.

If found one but not in primary/standby config, disable log_archive_dest_2 to the instance, ie

From the error message of "Standby database ID mismatch [0xAAAA:0xBBBBB]"

Convert the hex number of first argument, 0xAAAA to decimal value using calculator

Then search db with the dbid.

SQL> select dbid from v$database;

SQL> alter system set log_archive_dest_2_state=defer;

根據Oracle 的說法，是log_archive_dest_2引數的問題，檢查了一下備庫的引數，果然如此：

SQL> show parameter log_archive_dest_2

NAMETYPEVALUE

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

log_archive_dest_2stringservice=orcl_1 （指向了主庫）

SQL> alter system set log_archive_dest_2_state=defer;

系統已更改。

修改之後，再次檢查主備的alert log。都沒有了這種錯誤。

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