Oracle Data Guard 主库报--RFS Possible network disconnect with primary database

检查Data Guard 主库，发现log有如下信息：

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

查看备库，也有相关信息：

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 的解释：

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 that has 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 its log_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;

根据Oracle 的说法，是log_archive_dest_2参数的问题，检查了一下备库的参数，果然如此：

SQL> show parameter log_archive_dest_2

NAME TYPE VALUE

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

log_archive_dest_2 string service=orcl_1 （指向了主库）

SQL> alter system set log_archive_dest_2_state=defer;

系统已更改。

修改之后，再次检查主备的alert log。都没有了这种错误。

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