Login and connect CDB and PDB

[email protected]> select name from v$datafile;

NAME
------------------------------------------------------------------------------------------------------------------------
/oradata/ORCL/system01.dbf
/oradata/ORCL/sysaux01.dbf
/oradata/ORCL/undotbs01.dbf
/oradata/ORCL/pdbseed/system01.dbf
/oradata/ORCL/pdbseed/sysaux01.dbf
/oradata/ORCL/users01.dbf
/oradata/ORCL/pdbseed/undotbs01.dbf

7 rows selected.

[email protected]> show pdbs

    CON_ID CON_NAME                       OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
         2 PDB$SEED                       READ ONLY  NO
[email protected]>

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1 Connect CDB and PDB

1.1  Set up  ORACLE_SID
 To configure  ORACLE_SID, Use  OS  Verify connection  cdb1
[[email protected]:/home/oracle]$ export ORACLE_SID=cdb1
[[email protected]:/home/oracle]$ echo $ORACLE_SID

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1.2 Connect to the multi tenant database cdb1

Set up ORACLE_SID After the environment variable , Use it directly sqlplus Local operating system authentication login

[[email protected]:/home/oracle]$ sqlplus / as sysdba

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dbca  After the establishment of the database , tnsnames.ora  Has been added to  ORCL
[[email protected]:/home/oracle]$ cat $ORACLE_HOME/network/admin/tnsnames.ora
# tnsnames.ora Network Configuration File: /u01/app/oracle/product/19.3.0/db/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.

LISTENER_ORCL =
  (ADDRESS = (PROTOCOL = TCP)(HOST = orcl19C)(PORT = 1521))


ORCL =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = orcl19C)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl)
    )
  )

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Use tnsnames Service name login

[[email protected]:/home/oracle]$ sqlplus sys/[email protected] as sysdba

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1.3 Check whether the database is a multi tenant database

[email protected]> select name,cdb from v$database;

NAME      CDB
--------- ---
ORCL      YES

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1.4 View the currently connected container

[email protected]>  show con_name

CON_NAME
------------------------------
CDB$ROOT
[email protected]> show con_id

CON_ID
------------------------------
1

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1.5 View pluggable database pdb state

[email protected]> select name,con_id,open_mode from v$pdbs;

NAME                               CON_ID OPEN_MODE
------------------------------ ---------- ----------
PDB$SEED                                2 READ ONLY

[email protected]> show pdbs

    CON_ID CON_NAME                       OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
         2 PDB$SEED                       READ ONLY  NO

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1.6 Connect to pluggable database pdb

 Method 1 :alter session set container
[email protected]> alter session set container=pdb1;
[email protected]> show con_name

 Method 2 : Use the service name to connect 
 see  pdb1  service name 
[email protected]> select name,con_id from v$services;
ezconnect  The way 
 Use  ezconnect  The way , Specify the hostname explicitly （ip  Address ）、 Port number 、 service name 
[[email protected] ~]$ sqlplus sys/[email protected]:1521/pdb1 as sysdba

 To configure  tnsnames.ora  increase  pdb1
 Write client network configuration file  tnsnames.ora, increase  pdb1  Configuration of 
[[email protected] ~]$ cd $ORACLE_HOME/network/admin
[[email protected] admin]$ vi tnsnames.ora
pdb1 =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = orcl19C)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl)
    )
  )
  
sqlplus  Connect through the service name  pdb1
[[email protected] ~]$ sqlplus sys/[email protected] as sysdba
[email protected]> show con_name
[email protected]> show pdbs

cdb  Use  connect  Command switch to  pdb
 View current container 
[email protected]> show pdbs
sqlplus  Use in  connect  The command switches directly to  pdb1
[email protected]> conn sys/[email protected] as sysdba
[email protected]> show pdbs

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1.7 pdb Switch back to the cdb

1.7.1  Method 1 :alter session set container
[email protected]> alter session set container=cdb$root;
[email protected]> show pdbs

 It is recommended to switch or connect through the service name 
[email protected]> conn sys/[email protected] as sysdba

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