详解Oracle dg 三种模式切换
2015-12-22 11:16
531 查看
oracle dg 三大模式切换
===================================
1 最大性能模式MAXIMUM PERFORMANCE ------默认模式
===================================
一 最大性能模式特点
192.168.1.181 SQL> select database_role,protection_mode,protection_level from v$database; DATABASE_ROLE PROTECTION_MODE PROTECTION_LEVEL ---------------- -------------------- -------------------- PRIMARY MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE SQL> col dest_name for a25 SQL> select dest_name,status from v$archive_dest_status; DEST_NAME STATUS ------------------------- --------- LOG_ARCHIVE_DEST_1 VALID LOG_ARCHIVE_DEST_2 VALID SQL> show parameter log_archive NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ log_archive_config string dg_config=(orcl,db01) log_archive_dest_1 string location=/home/oracle/arch_orc l valid_for=(all_logfiles,all_ roles) db_unique_name=orcl log_archive_dest_2 string service=db_db01 LGWR ASYNC val id_for=(online_logfiles,primar y_roles) db_unique_name=db01 SQL> archive log list Database log mode Archive Mode Automatic archival Enabled Archive destination /home/oracle/arch_orcl Oldest online log sequence 31 Next log sequence to archive 33 Current log sequence 33 192.168.1.183 SQL> select database_role,protection_mode,protection_level from v$database; DATABASE_ROLE PROTECTION_MODE PROTECTION_LEVEL ---------------- -------------------- -------------------- PHYSICAL STANDBY MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE SQL> col dest_name for a25 SQL> select dest_name,status from v$archive_dest_status; DEST_NAME STATUS ------------------------- --------- LOG_ARCHIVE_DEST_1 VALID LOG_ARCHIVE_DEST_2 VALID SQL> show parameter log_archive NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ log_archive_config string dg_config=(db01,orcl) log_archive_dest_1 string location=/home/oracle/arch_db0 1 valid_for=(all_logfiles,all_ roles) db_unique_name=db01 log_archive_dest_2 string service=db_orcl LGWR ASYNC val id_for=(online_logfiles,primar y_roles) db_unique_name=orcl SQL> archive log list Database log mode Archive Mode Automatic archival Enabled Archive destination /home/oracle/arch_orcl Oldest online log sequence 31 Next log sequence to archive 33 Current log sequence 33 192.168.1.181 SQL> alter system switch logfile; SQL> archive log list Database log mode Archive Mode Automatic archival Enabled Archive destination /home/oracle/arch_orcl Oldest online log sequence 32 Next log sequence to archive 34 Current log sequence 34 192.168.1.183 SQL> archive log list Database log mode Archive Mode Automatic archival Enabled Archive destination /home/oracle/arch_db01 Oldest online log sequence 32 Next log sequence to archive 0 Current log sequence 34
===================================
2 最大性能模式--切换到-->最大高可用 (默认是最大性能模式---MAXIMUM PERFORMANCE)
===================================
192.168.1.181 SQL> select DATABASE_ROLE,PROTECTION_MODE,PROTECTION_LEVEL from v$database; DATABASE_ROLE PROTECTION_MODE PROTECTION_LEVEL ---------------- -------------------- -------------------- PRIMARY MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE SQL> show parameter log_archive_dest_2 NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ log_archive_dest_2 string service=db_db01 LGWR ASYNC val id_for=(online_logfiles,primar y_roles) db_unique_name=db01 192.168.1.181 SQL> shutdown immediate 192.168.1.183 SQL> alter database recover managed standby database cancel; SQL> shutdown immediate 192.168.1.181 SQL> startup mount; SQL> alter database set standby database to maximize availability; SQL> alter system set log_archive_dest_2='service=db_db01 LGWR SYNC valid_for=(online_logfiles,primary_roles) db_unique_name=db01' scope=spfile; 192.168.1.183 SQL> startup nomount SQL> alter database mount standby database; SQL> alter system set log_archive_dest_2='service=db_orcl LGWR SYNC valid_for=(online_logfiles,primary_roles) db_unique_name=orcl' scope=spfile; SQL> shutdown immediate SQL> startup nomount SQL> alter database mount standby database; 192.168.1.181 SQL> startup SQL> col dest_name for a25 SQL> select dest_name,status from v$archive_dest_status; DEST_NAME STATUS ------------------------- --------- LOG_ARCHIVE_DEST_1 VALID LOG_ARCHIVE_DEST_2 VALID SQL> show parameter log_archive_dest_2 NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ log_archive_dest_2 string service=db_db01 LGWR SYNC vali d_for=(online_logfiles,primary _roles) db_unique_name=db01 SQL> select database_role,protection_level,protection_mode from v$database; DATABASE_ROLE PROTECTION_LEVEL PROTECTION_MODE ---------------- -------------------- -------------------- PRIMARY MAXIMUM AVAILABILITY MAXIMUM AVAILABILITY SQL> archive log list Database log mode Archive Mode Automatic archival Enabled Archive destination /home/oracle/arch_orcl Oldest online log sequence 34 Next log sequence to archive 36 Current log sequence 36 192.168.1.183 SQL> col dest_name for a25 SQL> select dest_name,status from v$archive_dest_status; DEST_NAME STATUS ------------------------- --------- LOG_ARCHIVE_DEST_1 VALID LOG_ARCHIVE_DEST_2 VALID SQL> show parameter log_archive_dest_2 NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ log_archive_dest_2 string service=db_orcl LGWR SYNC vali d_for=(online_logfiles,primary _roles) db_unique_name=orcl SQL> select database_role,protection_level,protection_mode from v$database; DATABASE_ROLE PROTECTION_LEVEL PROTECTION_MODE ---------------- -------------------- -------------------- PHYSICAL STANDBY MAXIMUM AVAILABILITY MAXIMUM AVAILABILITY SQL> archive log list Database log mode Archive Mode Automatic archival Enabled Archive destination /home/oracle/arch_db01 Oldest online log sequence 35 Next log sequence to archive 0 Current log sequence 36 192.168.1.181 SQL> alter system switch logfile; SQL> archive log list Database log mode Archive Mode Automatic archival Enabled Archive destination /home/oracle/arch_orcl Oldest online log sequence 35 Next log sequence to archive 37 Current log sequence 37 192.168.1.183 SQL> archive log list Database log mode Archive Mode Automatic archival Enabled Archive destination /home/oracle/arch_db01 Oldest online log sequence 36 Next log sequence to archive 0 Current log sequence 37
===================================
3 最大高可用--切换到-->最保护能模式
===================================
DG最大保护模式Maximum protection
192.168.1.181 SQL> shutdown immediate 192.168.1.183 SQL> shutdown immediate 192.168.1.181 SQL> alter database set standby database to maximize protection; SQL> shutdown immediate 192.168.1.183 SQL> startup nomount SQL> alter database mount standby database; 192.168.1.181 SQL> startup SQL> col dest_name for a25 SQL> select dest_name,status from v$archive_dest_status; DEST_NAME STATUS ------------------------- --------- LOG_ARCHIVE_DEST_1 VALID LOG_ARCHIVE_DEST_2 VALID SQL> show parameter log_archive_dest_2 NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ log_archive_dest_2 string service=db_db01 LGWR SYNC vali d_for=(online_logfiles,primary _roles) db_unique_name=db01 SQL> select database_role,protection_level,protection_mode from v$database; DATABASE_ROLE PROTECTION_LEVEL PROTECTION_MODE ---------------- -------------------- -------------------- PRIMARY MAXIMUM PROTECTION MAXIMUM PROTECTION SQL> archive log list Database log mode Archive Mode Automatic archival Enabled Archive destination /home/oracle/arch_orcl Oldest online log sequence 37 Next log sequence to archive 39 Current log sequence 39 192.168.1.183 SQL> col dest_name for a25 SQL> select dest_name,status from v$archive_dest_status; DEST_NAME STATUS ------------------------- --------- LOG_ARCHIVE_DEST_1 VALID LOG_ARCHIVE_DEST_2 VALID SQL> show parameter log_archive_dest_2 NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ log_archive_dest_2 string service=db_db01 LGWR SYNC vali d_for=(online_logfiles,primary _roles) db_unique_name=db01 SQL> select database_role,protection_level,protection_mode from v$database; DATABASE_ROLE PROTECTION_LEVEL PROTECTION_MODE ---------------- -------------------- -------------------- PRIMARY MAXIMUM PROTECTION MAXIMUM PROTECTION SQL> archive log list Database log mode Archive Mode Automatic archival Enabled Archive destination /home/oracle/arch_db01 Oldest online log sequence 37 Next log sequence to archive 0 Current log sequence 39 192.168.1.181 SQL> alter system switch logfile; SQL> archive log list Database log mode Archive Mode Automatic archival Enabled Archive destination /home/oracle/arch_orcl Oldest online log sequence 38 Next log sequence to archive 40 Current log sequence 40 192.168.1.183 SQL> archive log list Database log mode Archive Mode Automatic archival Enabled Archive destination /home/oracle/arch_db01 Oldest online log sequence 37 Next log sequence to archive 0 Current log sequence 40
附:Oracle DG管理模式和只读模式相互切换
将standby数据库开启至只读模式(用于primary非常忙时,可以在standby跑一些报表)
$sqlplus “/as sysdba” SQL>startup mount SQL>alter database open read only; [@more@]
将只读模式standby数据库切换至管理模式
$sqlplus “/as sysdba” SQL>alter database recover managed standby database disconnect from session;
将管理模式的standby数据库切换至只读模式
$sqlplus “/as sysdba” SQL>alter database recover managed standby database cancel; SQL>alter database open read only;
以上内容给大家介绍了Oracle dg 三种模式切换的相关知识,希望大家喜欢。
您可能感兴趣的文章:
相关文章推荐
- 基于 Red Hat 的发行版 Oracle Linux 正式发布Oracle Linux 7.1
- Oracle Containers for J2EE远程安全漏洞(CVE-2014-0413)
- Oracle 10g R2不能使用EM的问题
- 表空间操作
- PreparedStatement中in子句的处理
- VMware下RedHat4.8_64位安装Oracle 10g RAC--简略脚本
- oracle sql日期比较
- 基于 Red Hat 的发行版 Oracle Linux 正式发布Oracle Linux 7.1
- OS block size和Oracle block size,查找OS Blocksize的方法
- 架构纵横谈之二 ---- 架构的模式与要点
- oracle中创建数据库和表空间的几点总结
- 数据库自动备份脚本
- PostgreSQL教程(二):模式Schema详解
- oracle的nvl函数的使用介绍
- 解决oracle用户连接失败的解决方法
- oracle的一些tips技巧
- Oracle 下的开发日积月累
- Oracle存储过程之数据库中获取数据实例
- Windows下ORACLE 10g完全卸载的方法分析