Switching between pluggable database – alter session set container

-
Alter session set container - <pdb_name> can be used to switch between pluggable databases of multitenant Oracle setup.
With Oracle multitenant being Oracles preferred implementation method with non-cdb architecture is deprecated in Oracle 12c - (Refer screen below , https://docs.oracle.com/database/121/UPGRD/deprecated.htm#BABDBCJI), alter session set container does become a common command to use.

Alter session set container example

 oracle@pcitdb:~$ sqlplus sys as sysdba  
 SQL*Plus: Release 12.2.0.1.0 Production on Wed Jul 22 16:57:54 2020  
 Copyright (c) 1982, 2016, Oracle. All rights reserved.  
 Enter password:  
 Connected to:  
 Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production  
 SQL> set lines 1000  
 SQL> show pdbs;  
   CON_ID CON_NAME            OPEN MODE RESTRICTED  
 ---------- ------------------------------ ---------- ----------  
      2 PDB$SEED            READ ONLY NO  
      3 PRMUATPDB           READ WRITE NO  
      4 PRMGLD31            MOUNTED  
      5 PRMDEVPDB           MOUNTED  
      7 PRMINTGR            READ WRITE NO  
 SQL> alter session set container=PRMINTGR;  
 Session altered.  
 SQL> show pdbs;  
   CON_ID CON_NAME            OPEN MODE RESTRICTED  
 ---------- ------------------------------ ---------- ----------  
      7 PRMINTGR            READ WRITE NO  
 SQL> show user;  
 USER is "SYS"  
 SQL>
Also if you are too lazy to type the whole command every time you switch between pdbs, best option is to have sql files created with alter sessions set container command in home directory so script can be executed to switch to PDB.
 oracle@pcitdb:~$ cat PRMINTGR.sql  
 alter session set container=PRMINTGR;  
 oracle@pcitdb:~$ sqlplus sys as sysdba  
 SQL*Plus: Release 12.2.0.1.0 Production on Wed Jul 22 23:36:17 2020  
 Copyright (c) 1982, 2016, Oracle. All rights reserved.  
 Enter password:  
 Connected to:  
 Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production  
 SQL> @PRMINTGR  
 Session altered.  
 SQL> show pdbs;  
   CON_ID CON_NAME            OPEN MODE RESTRICTED  
 ---------- ------------------------------ ---------- ----------  
      7 PRMINTGR            READ WRITE NO  
 SQL>

Comments

Post a Comment

Popular posts from this blog

ORA-16433: The database or pluggable database must be opened in read/write

-
Image
ORA-16433 is an error returned when a database cannot be opened. This can be a result of multiple conditions including, The inconsistency of the database Physical corruption Loss of dependent files or access issues etc.. More often than not the solution is to recover from available backups, but there can be situations where backups are not available, specially on UAT or Test setups. Although not the ideal scenario, in this type of situation you might want to open the databases even with inconsistency.  In Comes --> _ALLOW_RESETLOGS_CORRUPTION First, if you are in a position to use _ALLOW_RESETLOGS_CORRUPTION=TRUE, that means it has to be a critical moment, and when you come across more ora- errors while you are trying to reopen the databsae, that can be annoying. Note - _ALLOW_RESETLOGS_CORRUPTION=TRUE must only be used after Oracle support confirmation as a last resort. Also make sure to take cold backup before proceeding. Basic steps to be followed to resolve ORA 16433 after
Read more

Wait for unread message on broadcast channel - Blocking Sessions

-
Image
What is Wait for unread message on broadcast channel wait event? Wait for unread message on broadcast channel is a wait event where source destination communication is involved and the database is waiting for a reply from remote party. Mostly this wait is seen related to data pump export (expdp) or import (impdp) operations. Although categorized in idle wait class "Wait for unread message on broadcast channel" can become the blocking session for some other sessions. Common causes for stuck sessions waiting on this wait event includes, Broken databases links, where remote database is not responding. Abnormally killed remote processes causing the sessions to wait. When a session is waiting on "Wait for unread message on broadcast channel" it can become a blocking session for dependent sessions. Most probably these sessions will be waiting on "library cache pin" or related concurrency wait events. The blocking_session column of (g)v$session view
Read more

ORA-14126 - While splitting max value partition

-
Oracle version -- Oracle 9i to 11g While splitting partitions, SQL> alter TABLE ARBOR.CDR_BILLED split PARTITION CDR_BILLED_MAXVALUE at (TO_DATE('2014-09-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN')) into (partition CDR_BILLED_01SEP14,partition CDR_BILLED_MAXVALUE) TABLESPACE "C01_CDR_BILL" update global indexes; 2 into (partition CDR_BILLED_01SEP14,partition CDR_BILLED_MAXVALUE) TABLESPACE "C01_CDR_BILL" update global indexes * ERROR at line 2: ORA-14126: only a <parallel clause> may follow description(s) of resulting partitions 4:58:56 PM The reason for above error is while splitting max value partition, it is not allowed to explicitly provide a tablespace. The splitted partition will be reside on the same tablespace as the max value partitions. Below can be used without the tablespace clause to split the max value partition, alter TABLE ARBOR.CDR_BILLED split PARTITION CDR_BILLED_
Read more