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BEGIN WORK

Name

BEGIN WORK — Begins a transaction
  
BEGIN [ WORK | TRANSACTION ]
  

Inputs

None

Outputs

BEGIN

This signifies that a new transaction has been started.

NOTICE: BeginTransactionBlock and not in default state

This indicates that a transaction was already in progress. The current transaction is not affected.

Description

BEGIN initiates a user transaction which Postgres will guarantee is serializable with respect to all concurrently executing transactions. Postgres uses two-phase locking to perform this task. If the transaction is committed, Postgres will ensure either that all updates are done or else that none of them are done. Transactions have the standard ACID (atomic, consistent, isolatable, and durable) property.

Notes

The keyword TRANSACTION is just a cosmetic alternative to WORK. Neither keyword need be specified.

Refer to the LOCK statement for further information about locking tables inside a transaction.

Use COMMIT or ROLLBACK to terminate a transaction.

Usage

To begin a user transaction:

BEGIN WORK;
  

Compatibility

BEGIN is a Postgres language extension.

SQL92

There is no explicit BEGIN WORK command in SQL92; transaction initiation is always implicit and it terminates either with a COMMIT or with a ROLLBACK statement.

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