一套Linux上的11.2.0.2 RAC系统，其中一个节点startup mount时出现ORA-19808错误，日志如下：

SQL> alter database mount;alter database mount*ERROR at line 1:ORA-01105: mount is incompatible with mounts by other instancesORA-19808: recovery destination parameter mismatchSQL> exitDisconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit ProductionWith the Partitioning, Real Application Clusters, OLAP, Data Miningand Real Application Testing options[oracle@rh3 ~]$ oerr ora 1980819808, 00000, "recovery destination parameter mismatch"// *Cause:  The value of parameters DB_RECOVERY_FILE_DEST and//          DB_RECOVERY_FILE_DEST_SIZE must be same in all instances.//          instance. All databases must have same recovery destination//          parameters.// *Action: Check DB_RECOVERY_FILE_DEST and DB_RECOVERY_FILE_DEST_SIZE//          values in all instances.SQL> col name for a30SQL> col value for a30SQL> select name ,value,inst_id from gv$system_parameter  where name='db_recovery_file_dest_size';NAME                           VALUE                             INST_ID------------------------------ ------------------------------ ----------db_recovery_file_dest_size     0                                       1db_recovery_file_dest_size     42278584320                             2

该错误是由于启动节点使用了pfile形式的参数文件，而该参数文件中的db_recovery_file_dest_size值与已经启动的另一个节点的db_recovery_file_dest_size不一致所造成。 如果使用共享的server parameter file则不可能出现上述情况，当然也可以通过在启动节点上修改db_recovery_file_dest_size来解决问题。