12c OCM note 02 -- database Vs instance / CDB architect / connect to CDB, PDBs/ Tools

database Vs instance
=================
11g:
single instance: one database -- one instance
RAC: one database -- two or more instances

12c:
non-CDB: same as 11g
CDB:
single instance: one or more databases -- one instance
RAC: one or more databases -- two or more instances




CDB architect
=================
One instance is shared by multiple databases(cdb$root, pdb$seed, other pdbs)


Connect to CDB, PDBs
=================

Connect to root： sqlplus / as sysdba conn / as sysdba

EZ connect： sqlplus sys/oracle@localhost/PRODCDB.example.com:1521 as sysdba sqlplus sys/oracle@host02/PRODCDB.example.com:1521 as sysdba sqlplus sys/oracle@192.168.59.59/PRODCDB.example.com:1521 as sysdba

tns： sqlplus sys/oracle@tns_prodcdb as sysdba

switch container：

alter session set container=cdb$root; Connect to PDB： EZ connect： sqlplus sys/oracle@localhost/pdbprod1.example.com:1521 as sysdba sqlplus sys/oracle@192.168.59.59/pdbprod1.example.com:1521 as sysdba tns： sqlplus sys/oracle@tns_pdb1 as sysdba switch container： alter session set container=PDBPROD2; ---Some useful views col name format a20 col pdb format a10 select name,pdb from cdb_services order by con_id; select name,pdb from v$services order by con_id;

Tools
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SQL developer
OEM
TOAD --- Not recommended.