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Friday, November 19, 2010

Flashback - 10g or Later

Today i need to post on flashback feature on oracle database (10g or later)


One of my friend needed step by step configuration of Flashback. Here we go..

1. Database should be on archivelog mode

Startup the database with mount option:
(Simple Example of the procedure)

connect as sysdba

SQL*Plus: Release - Production on Fri Nov 19 14:40:28 2010

Copyright (c) 1982, 2005, Oracle. All rights reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release - Production
With the Partitioning, OLAP and Data Mining options

SQL> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 3
Next log sequence to archive 5
Current log sequence 5

SQL> shut immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.

SQL> startup mount;
ORACLE instance started.

Total System Global Area 603979776 bytes
Fixed Size 1220796 bytes
Variable Size 184553284 bytes
Database Buffers 411041792 bytes
Redo Buffers 7163904 bytes
Database mounted.

Enable the Flashback:

SQL> alter database flashback on;

Database altered.


System altered.


System altered.

SQL> alter system set DB_RECOVERY_FILE_DEST_SIZE=1G;

System altered.

SQL> alter database open;

Now connect as a normal user who has default tablespace as someone other than SYSTEM

SQL> conn balaji/balaji

SQL> create table test (id number(2), name varchar(30));

Table created.

SQL> insert into table test values (3, 'INDIA');
1 row inserted

SQL> insert into table test values(4,'SRILANKA');
1 row inserted

SQL> select * from test;

---------- --------------------

SQL> select tablespace_name from dba_segments where segment_name like 'TEST';


Note the user balaji has the default tablespace as USERS.

Drop the table test:

SQL> drop table test;

Table dropped.

SQL> select * from test;
ERROR at line 1:
ORA-00942: table or view does not exist

Using Flashback to get the table from recycle bin:

SQL> flashback table "TEST" to before drop;

Flashback complete.

SQL> select * from test;

---------- --------------------


Points to remember:
Flashback option will not work for SYSTEM tablespace objects.

You will receive:
SQL> flashback table "TEST" to before drop;
flashback table "TEST" to before drop
ERROR at line 1:
ORA-38305: object not in RECYCLE BIN

This is not about SYS objects, this is about SYSTEM tablespace... I can create a sys.table (logged as sys) on USER tablespace and then recover it through flashback.

Recycle functionality is available only for non-system locally-managed tablespaces.

Hope it helps... Cheers!!!

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