Commit (data management)

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In computer science and data management, a commit is the making of a set of tentative changes permanent, marking the end of a transaction and providing Durability as in Atomicity, Consistency, Isolation, and Durability (ACID) transactions. A commit is an act of committing. The record of commits is called the commit log.

In terms of transactions, the opposite of commit is to discard the tentative changes of a transaction, a rollback.

The transaction, commit and rollback concepts are key to the ACID property of databases.^[1]

A COMMIT statement in SQL ends a transaction within a relational database management system (RDBMS) and makes all changes visible to other users. The general format is to issue a BEGIN WORK (or BEGIN TRANSACTION, depending on the database vendor) statement, one or more SQL statements, and then the COMMIT statement. Alternatively, a ROLLBACK statement can be issued, which undoes all the work performed since BEGIN WORK was issued. A COMMIT statement will also release any existing savepoints that may be in use.

• Atomic commit
• Two-phase commit protocol
• Three-phase commit protocol

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