Overview of Transactions

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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 COMMITROLLBACK typically comes under TCL (Transaction Control Language)