Oracle rollback | rollback - oracle tutorial - sql tutorial




What is Oracle Rollback ?

  • Rollback is the inverse of Commit Statement.
  • This statement is used to undo the work performed by the current transaction or a transaction that is in doubt.
  • Rollback restore the state of the database to the last commit point.
 rollback

Syntax:

ROLLBACK;
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Example:

 oracle rollback after commit
  1. Delete From the “wikitechy table”.
  2. ROLLBACK is the keyword.
  3. SELECT from the wikitechy table.
  4. The Output has been processed according to rollup statement.

Difference between ROLLBACK

  • As both ROLLBACK and COMMIT Commands are TCC (Transaction Control Commands), but are not similar to eachother. Here is the difference:
ROLLBACK COMMIT
To undo the work/changes
that are committed
or done by COMMIT clause
we use the ROLLBACK Command.
It is reverse of COMMIT.

It rollbacks all the changes
of the current transactions.

In other words ROLLBACK restore
the state of the database
to the last commit point.
Whatever changes we have made/ done
in our transaction cannot be fixed until we commit that transaction
and this can be possible by using COMMIT statement.

In other words it will make our changes permanent
that cannot be rolled back.
Syntax
ROLLBACK;
Syntax
COMMIT;
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Syntax: when both are used at the same time:

BEGIN [WORK]
COMMIT [WORK] [AND [NO] CHAIN] [[NO] RELEASE]
ROLLBACK [WORK] [AND [NO] CHAIN] [[NO] RELEASE]
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