1、1：srvctl start database -d orcl_standby -o 'read only' 一致卡住[oracle@qidongbk1 dbs]$ srvctl start database -d orcl_standby -o 'read only'
2、2：查看数据库alert日志发现日志文件缺失Completed: ALTER DATABASE MOUNT /* db agent *//* {1:3056:3070} */ALTER DATABASE OPEN READ ONLY /* db agent *//* {1:3056:3070} */AUDIT_TRAIL initialization parameter is changed to OS, as DB is NOT compatible for database opened with read-only accessThis instance was first to openBeginning Standby Crash Recovery.Errors in file /u01/app/oracle/diag/rdbms/orcl_standby/orcl_standby2/trace/orcl_standby2_lgwr_31115.trc:ORA-00313: open failed for members of log group 5 of thread 1ORA-00312: online log 5 thread 1: '+DATADG/orcl_standby/onlinelog/group_5'ORA-17503: ksfdopn:2 Failed to open file +DATADG/orcl_standby/onlinelog/group_5查看+DATADG/orcl_standby/onlinelog中没有日志文件。
6、6：进程杀掉后备库关闭正常
8、8：apply进程apply data完之后日志自动创建查看开启apply进程的备库节点的alert日志，发现media recovery正在等待thread2（也就是主库节点2）的日志序列：18949到主库节点2 archive log list查看节点2的实例日志序列号就是18949说明apply进程apply data完成并等待主库的归档。这时候asmcmd查看日志文件时发现日志文件已经自动创建
