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ORACLE如何切换到用户需要的数据库？
1、使用组合键“Win + R”打开运行对话框，在输入框中输入 regedit 并回车打开“注册表编辑器”。
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2、在“注册表编辑器”对话框，依次展开 HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\KEY_OraDb10g_home1名称为 ORACLE_SID 的数据 orcl 即 Oracle数据库的SID。
3、在远程连接工具 XShell使用 root 用户或者 oracle 用户连接 Linux/Unix Oracle数据库服务器。
4、输入命令 su - oracle 切换到 oracle 用户即可。
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
3ORACLE数据库日志有哪几种模式，如何在不同模式中切换？
有两种模式：
一：日志模式，日志模式的设置分为Archive
Mode和No
Archive
Mode。
二：自动归档模式：自动归档模式的设置分为：Enabled和Disabled
可用可用archive
log
list命令来查看数据库的现行日志和自动归档模式的设置。
希望对你有帮助。
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