Oracle DataGuard延迟应用归档归档日志

Posted 2021-03-26 刚好遇见Mysql

1. 查看主库的参数设置：
SQL> show parameter log_archive_dest_2


NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_2                   string      SERVICE=STANDBY LGWR SYNC AFFI
                                                RM VALID_FOR=(ONLINE_LOGFILES,
                                                PRIMARY_ROLE) DB_UNIQUE_NAME=S
                                                TANDBY


2. 在主库设置延时5分钟：
SQL> alter system set log_archive_dest_2=‘SERVICE=STANDBY LGWR SYNC AFFIRM delay=5VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=STANDBY‘;


3. 验证是否延时：


主库执行：
SQL> alter system switch logfile;
System altered.


SQL>  select max(sequence#) from v$archived_log;


MAX(SEQUENCE#)
--------------
           28


备库：
Wed Jun 13 19:48:53 2012
Archived Log entry 14 added for thread 1 sequence 28 ID 0x4c9d8928 dest 1:
ARCb: Archive log thread 1 sequence 28 available in 5 minute(s)
Wed Jun 13 19:48:54 2012
Media Recovery Delayed for 5 minute(s) (thread 1 sequence 28) <<<<<<<<延时生效
Wed Jun 13 19:53:54 2012
Media Recovery Log /u01/oracle/arch1/standby/1_28_757620395.arc<<<<<5分钟后才应用这个归档
Media Recovery Waiting for thread 1 sequence 29 (in transit)