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Can we retrieve data after TRUNCATE?
Recover data lost due to a TRUNCATE operation without backups. If you’ve accidentally executed a TRUNCATE statement and you have a full database backup, given that no changes occurred after the table was truncated, you can simply recover the data by overwriting the original database with the backup.
Can we rollback after TRUNCATE in Oracle?
Quote: A TRUNCATE statement does not generate any undo information and it commits immediately. It is a DDL statement and cannot be rolled back. TRUNCATE does apparently do a COMMIT before and after it executes, which would explain why there is no ROLLBACK.
Can we DELETE after COMMIT?
All Data Manipulation Language (DML) changes are done as part of a transaction. They are not permanent until they are confirmed using the COMMIT statement. Once committed, the only way you can revert a change is to issue a new DML statement to alter the data.
Can we truncate database?
In order to truncate all tables in your database you must first remove all the foreign key constraints, truncate the tables, and then restore all the constraints. Load the data for all tables in the database. Execute a cursor to drop all constraints. Truncate all tables.
How to use flashback to rollback a truncate?
AT THE SAME TIME OTHER CHANGES ARE HAPPENING IN THE DATABASE AND THESE CHANGES WILL BE RECOVERED AFTER THE FLASHBACK IS DONE SQL> insert into scott.myobj2 select * from scott.myobj2; 356874 rows created.
Is there way to undo Flashback Table statement?
One thing you must remember about flashback operation is that undo of data is controlled by UNDO_RETENTION parameter. In simpler words, if undo data is available, then only tables can be restored back. Once you trigger FLASHBACK TABLE statement on any table, it cannot be rolled back.
Is there a way to flashback a table?
No, You can’t flashback a truncated table. But you can use traditional backup/recovery or FLASHBACK database to restore the table’s data. Try to flashback database to a earlier timestamp or System change number and export and import the truncated table.
Can a FDA be activated after a truncate?
By default they are disabled for all tables, but it can be activated, and will preserve your data even after a truncate. Moreover, even if you have the FDAs, you cannot just flashback the table, because TRUNCATE is a DDL operation, and will throw you an error that the table definition has been changed.