1. dataguard主备切换   1.1. 查看当前主备库是否具备切换条件 on slave select sequence#,first_time,next_time,archived,applied from v$archived_log where SEQUENCE#=(select max(SEQUENCE#) from v$archived_log); SEQUENCE# FIRST_TIME NEXT_TIME ARCHIVED APPLIED ---------- ------…

1. primary库设置dataguard相关参数   1.1. 强制primay库在任何状态下必须记录日志 SYS@userdata>select FORCE_LOGGING from v$database; FORCE_LOG --------- NO SYS@userdata>alter database force logging; Database altered. SYS@userdata>select FORCE_LOGGING from v$database; FORC…

1.  v$database    查看当前数据库的角色和保护模式 primary库查看 column NAME format a10 column PROTECTION_MODE format a20 column PROTECTION_LEVEL format a20 column DATABASE_ROLE format a20 select NAME,PROTECTION_MODE,PROTECTION_LEVEL,DATABASE_ROLE from v$database; NAME…

Oracle dataguard主库删除备库需要的归档时,会导致gap事情的产生,或者备库由于网络或物理故障原因,倒是备库远远落后于主库,都会产生gap事件,本例模拟gap事件的产生以及处理. 1. 查看当前dataguard同步状态 primary库查看 as MB,ARCHIVED,STATUS from v$log; THREAD# GROUP# SEQUENCE# MB ARCHIVED STATUS ---------- ---------- ---------- ----------…

1. 检查主备库的状态 on primary column DATABASE_ROLE format a20 column OPEN_MODE format a15 column PROTECTION_MODE format a20 column SWITCHOVER_STATUS format a20 select DATABASE_ROLE,OPEN_MODE,PROTECTION_MODE,SWITCHOVER_STATUS from v$database; DATABASE_ROLE O…

本次测试环境 系统版本 CentOS release 6.8 主机名 ec2t-userdata-01 ec2t-userdata-01 IP地址 10.189.102.118 10.189.100.195 数据库版本 11.2.0.4.0 数据库角色 primary standby Oracle 11.2.0.4.0下载地址 https://updates.oracle.com/Orion/Services/download/p13390677_112040_Linux-x86-64_1of7…

1. 设置备库的闪回目录 show parameter db_recovery_file; NAME TYPE VALUE ------------------------------------ --------------------------------- ------------------------------------------- db_recovery_file_dest string /u01/app/oracle/fast_recovery_area db_recove…

1. 检查当前主备库同步状态 on primary select ads.dest_id,max(sequence#) "Current Sequence", max(log_sequence) "Last Archived" from v$archived_log al, v$archive_dest ad, v$archive_dest_status ads where ad.dest_id=al.dest_id and al.dest_id=ads.dest_…

Oracle DataGuard主备切换可以使用传统的手动命令切换,也可以使用dgmgr切换,本文记录手动切换. (一)将主库切换为物理备库 STEP1:查看主库状态 SQL> SELECT OPEN_MODE, DATABASE_ROLE, SWITCHOVER_STATUS, FORCE_LOGGING, DATAGUARD_BROKER, GUARD_STATUS FROM V$DATABASE; OPEN_MODE DATABASE_ROLE SWITCHOVER_STATUS FOR…

Oracle 12C 物理Standby 主备切换switchover Oracle 12C 物理Standby 主备切换switchover Table of Contents 1. 简述 2. 切换检查 3. 问题及解决方法 3.1. ORA-16470 3.2. ORA-16475 3.2.1. dirty redo log 3.2.2. log_archive_dest_n 4. 切换角色 4.1. 切换备库角色为主库 4.2. 打开新的主库 4.3. 重启新的备库 5. 切换后的后续步…