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最近发表
- ORA-600 2131故障处理
- 收集统计信息报ORA-00600 16515问题解决
- rm -rf误删Oracle数据库恢复
- 分布式存储故障导致数据库无法启动故障处理
- read_me_recover_tn勒索恢复
- WINDOWS 下用dg broker搭建ADG(单机to单机)
- 存储故障后oracle报—ORA-01122/ORA-01207故障处理
- Oracle 23ai rm redo*.log恢复
- Oracle 发布计划—包含Oracle 23ai版本
- Oracle 23ai 变化之—-默认数据文件变为bigfile
- PostgreSQL解析wal日志之—walminer
- Oracle 19c/21c最新patch信息-202404
- PostgreSQL恢复系列:pg_filedump批量处理
- PostgreSQL部分主要字典信息
- PostgreSQL恢复系列:pg_filedump恢复字典构造
- PostgreSQL 16 源码安装
- ORA-00742 ORA-00312 恢复
- 数据库open成功后报ORA-00353 ORA-00354错误引起的一系列问题(本质ntfs文件系统异常)
- ORA-600 ktsiseginfo1故障
- ORA-00600: internal error code, arguments: [16703], [1403], [4] 原因
月归档:三月 2011
Data Guard常用视图
查看进程的活动状况—v$managed_standby
select process,client_process,sequence#,status from v$managed_standby;
PROCESS列显示进程信息
CLIENT_PROCESS列显示对应的主数据库中的进程
SEQUENCE#列显示归档redo的序列号
STATUS列显示的进程状态
确认redo应用进度—v$archive_dest_status
select dest_name,archived_thread#,archived_seq#,applied_thread#,recovery_mode, applied_seq#,db_unique_name from v$archive_dest_status where status=’VALID’;
检查归档文件路径及创建信息—v$archived_log
select name,creator,sequence#,applied,completion_time from v$archived_log;
select dest_id,max(sequence#) from v$archived_log group by dest_id;
查询归档历史—v$log_history
查询当前数据的基本信息—v$database信息
Data guard事件—v$dataguard_status
select message from v$dataguard_status;
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Data Guard switchover切换(Logical Standby Database)
1)Verify it is possible to perform a switchover on the primary database.
SELECT SWITCHOVER_STATUS FROM V$DATABASE;–TO STANDBY/SESSIONS ACTIVE
2)Prepare the current primary database for the switchover
ALTER DATABASE PREPARE TO SWITCHOVER TO LOGICAL STANDBY;–PREPARING SWITCHOVER
ALTER DATABASE PREPARE TO SWITCHOVER CANCEL;–cancel(终止操作)
3)Prepare the target logical standby database for the switchover
ALTER DATABASE PREPARE TO SWITCHOVER TO PRIMARY;
–PREPARING DICTIONARY–>PREPARING SWITCHOVER
ALTER DATABASE PREPARE TO SWITCHOVER CANCEL;–cancel(终止操作)
4)Ensure the current primary database is ready for the future primary
database’s redo stream
SELECT SWITCHOVER_STATUS FROM V$DATABASE;–TO LOGICAL STANDBY
5)Switch the primary database to the logical standby database role
ALTER DATABASE COMMIT TO SWITCHOVER TO LOGICAL STANDBY;
6)Ensure all available redo has been applied to the target logical standby
database that is about to become the new primary database
SELECT SWITCHOVER_STATUS FROM V$DATABASE;–TO PRIMARY
7)Switch the target logical standby database to the primary database role
ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY;
8)Start SQL Apply on the new logical standby database
ALTER DATABASE START LOGICAL STANDBY APPLY IMMEDIATE;
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11g data guard(LOGICAL STANDBY)配置
1、Create a Physical Standby Database
11g data guard(PHYSICAL STANDBY)配置
2、Stop Redo Apply on the Physical Standby Database
ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;
3、Prepare the Primary Database to Support a Logical Standby Database
1)Prepare the Primary Database for Role Transitions
*.log_archive_dest_1='LOCATION=/u01/archive valid_for=(online_logfiles,all_roles) db_unique_name=first' *.log_archive_dest_3='LOCATION=/u01/archive/standby VALID_FOR=(STANDBY_LOGFILES,STANDBY_ROLE) DB_UNIQUE_NAME=first' *.log_archive_dest_state_3='enable' --其他不修改
2)Build a Dictionary in the Redo Data
EXECUTE DBMS_LOGSTDBY.BUILD;
4、Transition to a Logical Standby Database
1)Convert to a Logical Standby Database
ALTER DATABASE RECOVER TO LOGICAL STANDBY db_name;
Note:
(1)如果数据库是open状态,需要重启,然后置于mount状态
(2)取消使用:RECOVER MANAGED STANDBY DATABASE CANCEL;
(3)如果执行到一半,然后取消,导致原物理库损坏(不能同步),从主库中重新生成备库的control file,然后启动物理库同步
2)Adjust Initialization Parameters for the Logical Standby Database
SHUTDOWN; STARTUP MOUNT; alter system set log_archive_dest_3='LOCATION=/u01/archive/standby VALID_FOR=(STANDBY_LOGFILES,STANDBY_ROLE) DB_UNIQUE_NAME=second'; alter system set log_archive_dest_1='LOCATION=/u01/archive valid_for=(online_logfiles,all_roles) db_unique_name=second'; alter system set LOG_ARCHIVE_DEST_STATE_3='ENABLE';
5、Open the Logical Standby Database
ALTER DATABASE OPEN RESETLOGS;
–开启实时应用
ALTER DATABASE START LOGICAL STANDBY APPLY IMMEDIATE;
–开启应用
ALTER DATABASE START LOGICAL STANDBY APPLY;
–关闭应用
ALTER DATABASE STOP LOGICAL STANDBY APPLY;
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