START TRANSACTION

START TRANSACTION

START TRANSACTION

7

SQL - Language Statements

START TRANSACTION

start a transaction block

START TRANSACTION [

transaction_mode

[, ...] ]

where

transaction_mode

is one of:

ISOLATION LEVEL { SERIALIZABLE | REPEATABLE READ | READ COMMITTED | READ UNCOMMITTED } READ WRITE | READ ONLY [ NOT ] DEFERRABLE

Description#

This command begins a new transaction block. If the isolation level, read/write mode, or deferrable mode is specified, the new transaction has those characteristics, as if SET TRANSACTION was executed. This is the same as the BEGIN command.

Parameters#

Refer to ??? for information on the meaning of the parameters to this statement.

Compatibility#

In the standard, it is not necessary to issue START TRANSACTION to start a transaction block: any SQL command implicitly begins a block. PostgreSQL's behavior can be seen as implicitly issuing a COMMIT after each command that does not follow START TRANSACTION (or BEGIN), and it is therefore often called “autocommit”. Other relational database systems might offer an autocommit feature as a convenience.

The DEFERRABLE \<transaction_mode> is a PostgreSQL language extension.

The SQL standard requires commas between successive \<transaction_modes>, but for historical reasons PostgreSQL allows the commas to be omitted.

See also the compatibility section of ???.

See Also#