# Getting started with 12c

Back in July I finally got Oracle 12c installed on my laptop as documented in this post: url

But, that was as far as I got.  The last thing I did was get an error message creating a user.  Well, I figured out how to create a new user and a few other things.  I’m working with the ORCL database that comes with the install and all the parameters, etc. that come with it.

Evidently the default install comes with a PDB called PDBORCL.  So, I have two tns entries one for the parent CBD and one for the child PDB and they look like this:

ORCL.WORLD =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.133.128)
(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl.mydomain.com)
)
)

PDB.WORLD =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.133.128)
(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = pdborcl.mydomain.com)
)
)

I guess the service name has the name of the PDB in it.

So, if I connect as SYSTEM/password@orcl I’m connected to the CDB and if I connect to SYSTEM/password@pdb I’m connected to the PDB.  When I connected to the PDB I could create a new user without getting an error.

But, when I first tried connecting to the PDB I got this error, even though the database was up:

ORA-01033: ORACLE initialization or shutdown in progress

So, to bring the database up (by the way, I’m on 64 bit Linux) after booting the Linux VM the following steps were required:

lsnrctl start

sqlplus / as sysdba

startup

alter session set container=PDBORCL;

startup

Probably this could all be scripted but that’s what I did today.

Interestingly there is only one pmon:

$ps -ef | grep pmon oracle 29495 1 0 06:52 ? 00:00:00 ora_pmon_orcl But you get different results when you query dba_data_files depending on whether connected to the CDB or PDB: CDB FILE_NAME ------------------------------------------ /u01/app/oracle/oradata/orcl/system01.dbf /u01/app/oracle/oradata/orcl/sysaux01.dbf /u01/app/oracle/oradata/orcl/undotbs01.dbf /u01/app/oracle/oradata/orcl/users01.dbf PDB FILE_NAME -------------------------------------------------------------- /u01/app/oracle/oradata/orcl/pdborcl/system01.dbf /u01/app/oracle/oradata/orcl/pdborcl/sysaux01.dbf /u01/app/oracle/oradata/orcl/pdborcl/SAMPLE_SCHEMA_users01.dbf /u01/app/oracle/oradata/orcl/pdborcl/example01.dbf So, I guess each PDB has its own SYSTEM and SYSAUX tablespaces? Lastly when running my scripts to poke around I edited my sqlplus header script to report which container you are in. It looks like this now: set linesize 32000 set pagesize 1000 set long 2000000000 set longchunksize 1000 set head off; set verify off; set termout off; column u new_value us noprint; column n new_value ns noprint; column c new_value cs noprint; select name n from v$database;
select user u from dual;
SELECT SYS_CONTEXT('USERENV', 'CON_NAME') c FROM DUAL;

set sqlprompt &ns:&cs:&us>

set head on
set echo on
set termout on
set trimspool on

spool &ns..&cs..logfilename.log

Replace “logfilename” with whatever you want for your script name.

It puts out a prompt like this:

CDB

ORCL:CDB$ROOT:SYSTEM> PDB ORCL:PDBORCL:SYSTEM> And the log file names: ORCL.CDB$ROOT.sessions.log

ORCL.PDBORCL.sessions.log

Anyway, this is just a quick post about my first attempts to get around in 12c.

– Bobby

## About Bobby

I live in Chandler, Arizona with my wife and three daughters. I work for US Foods, the second largest food distribution company in the United States. I've been working as an Oracle database administrator and PeopleSoft administrator since 1994. I'm very interested in Oracle performance tuning.
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