Can i rollback after commit

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Can I rollback a transaction I've already committed? Asked 9 years, 1 month ago. Active 4 months ago. Viewed k times. Is it possible to rollback now, after I've already committed? Any help? Improve this question. Craig Ringer k 59 59 gold badges silver badges bronze badges.

How about a transaction within a transaction? If the inner 2nd transaction is committed, what is the invariant that we should expect? Rolling back the outer 1st transaction also rolls back the 2nd transaction?

What is expected here? For example: db. I think you misunderstand the meaning of the word "commit". No, there's no query that will "undo" a committed data-modifying query. If you have a backup of the database, you can restore the backup and use DBA tools in MySQL's case, it's mysqlbinlog to "replay" all data-modifying queries from the logs since the backup back to the database, but skip over the problem query. How commit and rollback works in Oracle? What is a Transaction?

Can we rollback to same savepoint more than once? What is transaction control in Oracle? These are used to manage the changes made to the data in a table by DML statements.

It also allows statements to be grouped together into logical transactions. Why is my cauliflower not producing a head? What is internal and external criticism of historical sources?

Co-authors This statement also erases all savepoints in the transaction and releases transaction locks. You can see any changes you have made during the transaction by querying the modified tables, but other users cannot see the changes. After you commit the transaction, the changes are visible to other users' statements that execute after the commit.

If you do not explicitly commit the transaction and the program terminates abnormally, then the last uncommitted transaction is automatically rolled back. A normal exit from most Oracle utilities and tools causes the current transaction to be committed. A normal exit from an Oracle precompiler program does not commit the transaction and relies on Oracle Database to roll back the current transaction. The savepoint remains valid and can be rolled back to again later, if needed. The COMMIT statement commits the database changes that were made during the current transaction, making the changes permanent.

The ROLLBACK statement backs out, or cancels, the database changes that are made by the current transaction and restores changed data to the state before the transaction began. To illustrate the concept of a transaction, consider a banking database. This is because triggers fire during a transaction. When the trigger fires the current transaction is still not complete. The larger the number of rows processed, the more performance is gained by using a bulk collect.

Here instead of fetching one row, we bulk collect all the rows at once. To do that we need to use dynamic SQL. Triggers have an additional wrinkle: they are fired as part of the transaction, and they have a limitation that forbids us from issuing a commit inside their body. No, it will always commit. It is autocommit statement. Drops Once fired can not be rolled back.