Overview of Transactions

Overview of Transactions¶

Let us go through the details related to Transactions.* We typically perform operations such as COMMIT and ROLLBACK via the applications.

• COMMIT will persist the changes in the database.
• ROLLBACK will revert the uncommitted changes in the database.
• We typically rollback the uncommitted changes in a transaction if there is any exception as part of the application logic flow.
• For example, once the order is placed all the items that are added to shopping cart will be rolled back if the payment using credit card fails.
• By default every operation is typically committed in Postgres. We will get into the details related to transaction as part of application development later.
• Commands such as COMMIT, ROLLBACK typically comes under TCL (Transaction Control Language)