oracle如何自动切换,切换oracle用户命令

oracle数据库9i中如何设置自动切换重写日志

日志在写满以后会自动进行切换的，当然没有写满时也可以进行手工方式强制切换 alter system switch logfile;

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这个我就实在不知道了，9I上好你没有这个参数吧。找人问了问，人家也没说。

ORACLE 11G RAC数据库如何故障自动切换文档资料求解答

本文对Oracle11g中的自动数据库维护任务管理做一个总体介绍，文章保持简洁出于两个原因： 1、大部分人都还没有接触过这些设置。尽管这么说，如果你是在夜间处理维护任务的，如果在晚上打开一个维护窗口并不是一个好主意，你可能想要改变这一切。2、基本的管理任务都是自我控

oracle 11g dataguard能做到热备吗？能自动切换吗

dataguard的热备就是就是逻辑DG（有一点延迟，但是基本上数据量不大的话，还是可以的），现在用的不多，现在应用多的一般都是物理DG。因为物理DG比逻辑dg更加稳定，而且不会出现太大的资源调用，影响系统。

自动切换这里，要说明，dg的切换是有一套流程的，都可以自动有脚本完成，但是最后一步一定是手动的，所以不能完成全自动切换，最多就是半自动。

oracle数据库如何切换模式

oracle dg 三大模式切换

1、最大性能模式MAXIMUM PERFORMANCE --默认模式，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

和Oracle 之间自由切换，有什么好的解决方案么

1～尽量别用不标准的SQL。但是分页之类的语句没办法避免，只能够加参数动态在mybtais配置文件中切换。

2～mybtais用的时候别偷懒用接口自动生成dao的方式，dao还是老老实实在代码实现多个数据源切换。

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oracle如何自动切换,切换oracle用户命令

oracle数据库9i中如何设置自动切换重写日志

ORACLE 11G RAC数据库如何故障自动切换 文档资料求解答

oracle 11g dataguard能做到热备吗？能自动切换吗

oracle数据库如何切换模式

和Oracle 之间自由切换，有什么好的解决方案么

其他资讯

ORACLE 11G RAC数据库如何故障自动切换文档资料求解答