ORACLE 切换个实例，启动多个实例_centos oracle切换实例

//切换用户
[root@CentosDB ~]# su - oracle
上一次登录：五 7月 16 10:05:08 CST 2021pts/0 上
//切换实例
[oracle@CentosDB ~]$ export ORACLE_SID=orcl
[oracle@CentosDB ~]$ sqlplus /nolog
 
SQL*Plus: Release 11.2.0.1.0 Production on Fri Jul 16 11:33:44 2021
Copyright (c) 1982, 2009, Oracle.  All rights reserved.
 
SQL> conn / as sysdba
Connected.
SQL> show parameter name
 
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_file_name_convert                 string
db_name                              string      orcl
db_unique_name                       string      orcl
global_names                         boolean     FALSE
instance_name                        string      orcl
lock_name_space                      string
log_file_name_convert                string
service_names                        string      orcl
SQL>
//切换到另一个实例
[oracle@CentosDB ~]$ export ORACLE_SID=orcl
[oracle@CentosDB ~]$ sqlplus /nolog
 
SQL*Plus: Release 11.2.0.1.0 Production on Fri Jul 16 11:33:44 2021
Copyright (c) 1982, 2009, Oracle.  All rights reserved.
 
SQL> show parameter name
SP2-0640: Not connected
SQL> conn / as sysdba
Connected.
SQL> show parameter name
 
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_file_name_convert                 string
db_name                              string      orcl
db_unique_name                       string      orcl
global_names                         boolean     FALSE
instance_name                        string      orcl
lock_name_space                      string
log_file_name_convert                string
service_names                        string      orcl
SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64
With the Partitioning, OLAP, Data Mining and Real Application Testing options
[oracle@CentosDB ~]$ clear
[oracle@CentosDB ~]$ export ORACLE_SID=zsny
[oracle@CentosDB ~]$ sqlplus /nolog
 
SQL*Plus: Release 11.2.0.1.0 Production on Fri Jul 16 11:38:12 2021
Copyright (c) 1982, 2009, Oracle.  All rights reserved.
 
SQL> conn / as sysdba
Connected to an idle instance.
SQL> show parameter name
ORA-01034: ORACLE not available
Process ID: 0
Session ID: 0 Serial number: 0
 
//启动另一个实例
SQL> startup
ORACLE instance started.
 
Total System Global Area 1302769664 bytes
Fixed Size                  2213056 bytes
Variable Size             805309248 bytes
Database Buffers          486539264 bytes
Redo Buffers                8708096 bytes
Database mounted.
Database opened.
SQL>
//启动监听
[oracle@CentosDB ~]$ lsnrctl start

[root@CentosDB ~]# su - oracle
上一次登录：三 10月 20 09:53:30 CST 2021pts/0 上
//关闭监听器
[oracle@CentosDB ~]$ lsnrctl stop
 
LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 20-OCT-2021 10:20:00
 
Copyright (c) 1991, 2009, Oracle.  All rights reserved.
 
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))
The command completed successfully
[oracle@CentosDB ~]$ sqlplus /nolog
 
SQL*Plus: Release 11.2.0.1.0 Production on Wed Oct 20 10:20:53 2021
Copyright (c) 1982, 2009, Oracle.  All rights reserved.
 
SQL> conn / as sysdba
Connected to an idle instance.
SQL> shutdown immediate
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux-x86_64 Error: 2: No such file or directory
//关闭数据库
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
//启动数据库
SQL> startup
ORACLE instance started.
 
Total System Global Area 1904054272 bytes
Fixed Size                  2214496 bytes
Variable Size            1442842016 bytes
Database Buffers          452984832 bytes
Redo Buffers                6012928 bytes
Database mounted.
Database opened.
SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64                                                                                        bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
//启动监听器
[oracle@CentosDB ~]$ lsnrctl start
 
LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 20-OCT-2021 10:22:43
 
Copyright (c) 1991, 2009, Oracle.  All rights reserved.
 
Starting /u01/app/oracle/product/11.2.0/db_1/bin/tnslsnr: please wait...
 
TNSLSNR for Linux: Version 11.2.0.1.0 - Production
System parameter file is /u01/app/oracle/product/11.2.0/db_1/network/admin/liste                                                                                        ner.ora
Log messages written to /u01/app/oracle/diag/tnslsnr/CentosDB/listener/alert/log                                                                                        .xml
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1521)))
 
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 11.2.0.1.0 - Production
Start Date                20-OCT-2021 10:22:43
Uptime                    0 days 0 hr. 0 min. 0 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/oracle/product/11.2.0/db_1/network/admin/list                                                                                        ener.ora
Listener Log File         /u01/app/oracle/diag/tnslsnr/CentosDB/listener/alert/l                                                                                        og.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1521)))
The listener supports no services
The command completed successfully
[oracle@CentosDB ~]$