Snippet Name: FLASHBACK: SYS commands and queries
Description: A set of commands and queries related to flashback functionality.
The Flashback Data Archive can be used to automatically track and maintain historical changes to all Oracle data in a highly application transparent, secure and efficient manner. Flashback query allows a user to view the data quickly and easily the way it was at a particular time in the past, even when it is modified and committed, be it a single row or the whole table.
Also see:
» FLASHBACK: Oracle 10G enhancements
» FLASHBACK: AS OF clause
» FLASHBACK: Initialization Parameters
» FLASHBACK: Syntax Elements
Comment: (none)
Language: PL/SQL
Highlight Mode: PLSQL
Last Modified: March 13th, 2009
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SELECT current_scn
FROM v$database;
SELECT oldest_flashback_scn,
oldest_flashback_time
FROM gv$flashback_database_log;
GRANT flashback ANY TABLE TO user1;
-------------------------------
SHUTDOWN IMMEDIATE;
startup mount EXCLUSIVE;
-- be sure to substitute your SCN
FLASHBACK DATABASE TO SCN 19516617;
OR
FLASHBACK DATABASE TO RESTORE POINT bef_damage;
/*
FLASHBACK DATABASE TO TIMESTAMP (SYSDATE-1/24);
FLASHBACK DATABASE TO TIMESTAMP timestamp'2002-11-05 14:00:00';
FLASHBACK DATABASE
TO TIMESTAMP to_timestamp('2002-11-11 16:00:00', 'YYYY-MM-DD HH24:MI:SS');
*/
-- this will fail
ALTER database OPEN;
-- this will succeed
ALTER database OPEN resetlogs;
========================
SELECT *
FROM gv$flashback_database_stat;
ALTER system switch logfile;
shutdown IMMEDIATE;
startup mount EXCLUSIVE;
ALTER database flashback off;
ALTER database noarchivelog;
ALTER database OPEN;
SELECT flashback_on, log_mode
FROM v$database; |
