一、本地连接

1.1、说明

alter session 切换容器的语法

ALTER SESSION SET CONTAINER = container_name [SERVICE = service_name]

For container_name, specify one of the following:

• CDB$ROOT to switch to the CDB root

• PDB$SEED to switch to the CDB seed

• A PDB name to switch to the PDB

When the current container is the root, you can view the names of the PDBs in a CDB by querying the DBA_PDBS view

1.2、连接cdb

[oracle@oracle18c1 admin]$ ps -ef |grep pmon

oracle 3739 1 0 20:39 ? 00:00:00 ora_pmon_mycdb

oracle 9642 3635 0 22:03 pts/0 00:00:00 grep --color=auto pmon

[oracle@oracle18c1 admin]$ export ORACLE_SID=mycdb

[oracle@oracle18c1 admin]$ sqlplus / as sysdba

SQL*Plus: Release 18.0.0.0.0 - Production on Sat May 16 22:03:11 2020

Version 18.3.0.0.0

Copyright (c) 1982, 2018, Oracle. All rights reserved.

Connected to:

Oracle Database 18c Enterprise Edition Release 18.0.0.0.0 - Production

Version 18.3.0.0.0

SQL> show pdbs;

CON_ID CON_NAME OPEN MODE RESTRICTED

2 PDB$SEED READ ONLY NO

3 MYPDB1 READ WRITE NO

4 MYPDB2 READ WRITE NO

5 YOUPDB MOUNTED

1.3、cdb和pdb间的切换

1、切换到seed容器

SQL> alter session set container=PDB$SEED;

Session altered.

SQL> show pdbs;

CON_ID CON_NAME OPEN MODE RESTRICTED

2 PDB$SEED READ ONLY NO

2、由seed容器切换到mypdb1

SQL> alter session set container=mypdb1;

Session altered.

SQL> show pdbs;

CON_ID CON_NAME OPEN MODE RESTRICTED

3 MYPDB1 READ WRITE NO

3、由mypdb1切换到根cdb

SQL> alter session set container=CDB$ROOT;

Session altered.

SQL> show pdbs;

CON_ID CON_NAME OPEN MODE RESTRICTED

2 PDB$SEED READ ONLY NO

3 MYPDB1 READ WRITE NO

4 MYPDB2 READ WRITE NO

5 YOUPDB MOUNTED

二、远程连接

1、连接cdb

[oracle@oracle18c1 admin]$ sqlplus sys/Pa44w0rd@192.168.5.40:1521/mycdb as sysdba

SQL*Plus: Release 18.0.0.0.0 - Production on Sat May 16 22:10:58 2020

Version 18.3.0.0.0

Copyright (c) 1982, 2018, Oracle. All rights reserved.

Connected to:

Oracle Database 18c Enterprise Edition Release 18.0.0.0.0 - Production

Version 18.3.0.0.0

SQL> show pdbs;

CON_ID CON_NAME OPEN MODE RESTRICTED

2 PDB$SEED READ ONLY NO

3 MYPDB1 READ WRITE NO

4 MYPDB2 READ WRITE NO

5 YOUPDB MOUNTED

2、连接mypdb1

[oracle@oracle18c1 admin]$ sqlplus sys/Pa44w0rd@192.168.5.40:1521/mypdb1 as sysdba

SQL*Plus: Release 18.0.0.0.0 - Production on Sat May 16 22:10:42 2020

Version 18.3.0.0.0

Copyright (c) 1982, 2018, Oracle. All rights reserved.

Connected to:

Oracle Database 18c Enterprise Edition Release 18.0.0.0.0 - Production

Version 18.3.0.0.0

SQL> show pdbs;

CON_ID CON_NAME OPEN MODE RESTRICTED

3 MYPDB1 READ WRITE NO