SOME 12C NEW FEATURES FOR ORACLE DATABASE ADMINS

12C NEW FEATURES:

1) Like sysdba, sysoper & sysasm, we have new privileges, in Oracle 12.1.0.

    sysbackup for Backup operations

    sysdg for Data Guard operations

    syskm for Key management

 

2) Oracle Database 12c Data Pump will allow turning off redo for the import operation (only).

   $ impdp ... transform=disable_archive_logging:y

 

3) CAN CREATE INVISIBLE COLUMNS AND WE CHANGE IT TO VISIBLE OR INVISIBLE

 

4) Moving and Renaming datafile is now ONLINE, no need to put datafile in offline.

   SQL> alter database move datafile 'path' to 'new_path';

 

5). Restricting PGA size  - Pre Oracle 12c R1, there was no option to limit and control the PGA size. Although, you set a certain size to PGA_AGGREGATE_TARGET initialization parameter, in 12c we can restrict using PGA_AGGREGATE_LIMIT parameter.

 

6) ASM: Introduction of Flex ASM, ASM would run only on 3 instances on a cluster even if more than 3, the instances that not have an ASM would request remote ASM, typically like SCAN. In normal conditions in a node if ASM fails the entire node will be useless, where in 12c the ability to get the extent map from remote ASM instance makes the node useful.

 

7) RMAN: Running SQL commands and executing PLSQL procedures in RMAN without SQL keyword.

   RMAN> select * from v$session;

 

8) Table level restoration i.e. object level using RMAN

 

9) In Oracle 12c, ACTIVE DUPLICATE DATABASE doesn’t not required any pre backup existence to clone the database, RMAN first takes backup of datafiles into backupsets, and transmit to the auxiliary location and will be restored/recovered subsequently.

 

10) New NOOPEN clause in 12c ACTIVE DUPLICATE DATABASE, will prevent opening database immediately after the cloning process completion and the database will remain in MOUNT state and we have to manually open the database.

11)Patching:

Centralised patching. We can retrieve OPatch information using sqlplus query, using DBMS_QOPATCH package

SQL> select dbms_qopatch.get_opatch_lsinventory() from dual;

 

12) New initialization parameters in Oracle 12c Release 1

temp_undo_enabled (=false|true)

DB_FLASH_CACHE_FILE

DB_FLASH_CACHE_SIZE

enable_ddl_logging

 

13) New tables/views in Oracle Database 12c

dba_pdbs

v$pdbs

cdb_data_files

 

14) New Packages in 12c Oracle Release 1

dbms_pdb

dbms_qopatch

UTL_CALLSTACK

dbms_redact