ORA-16753 错误问题解决

1、使用dgmgrl将数据库设置为只读模式：

DGMGRL>edit database dg_name set state=read-only;
ORA-16753 Resource guard could not open standby database
Cause:Resource guard could not open standby database.
Action:Check the Data Guard console log for further details.

2、查看dg日志${bdump}/drc$SID.log记录




可以看到很关键的一条信息：

ORA-16006: audit_trail destination incompatible with database open mode

原来如此，通过show parameter audit_trail，可以看到audit_trail=db。

3、audit_trail参数说明

AUDIT_TRAIL = { none | os | db | db,extended | xml | xml,extended }
db：Directs audit records to the database audit trail (the SYS.AUD$table), except for records that are always written to the operating systemaudit trail. Use this setting for a general database for manageability.
If the database was started in read-onlymode with AUDIT_TRAIL set to db, then Oracle Database internally sets AUDIT_TRAILto os. Check the alert log for details.

详见官网http://docs.oracle.com/cd/B19306_01/server.102/b14237/initparams016.htm或者：http://blog.csdn.net/tianlesoftware/article/details/4712932说明

4、将audit_trail设置为none并重启数据库
alter system set audit_trail=none scope=spfile；

重启以后问题解决。