SET AUTOCOMMIT - MySQL

Overview

The SET AUTOCOMMIT command controls whether autocommit mode is enabled or disabled for the current session. In autocommit mode, every statement is automatically committed when it is executed. When autocommit mode is disabled, transactions can be created and statements can be grouped together before being committed as a single unit.

Syntax

SET AUTOCOMMIT=0 | 1

Options/Flags

  • 0: Disables autocommit mode.
  • 1: Enables autocommit mode.

Examples

  • Enable autocommit mode:
SET AUTOCOMMIT=1;
  • Disable autocommit mode:
SET AUTOCOMMIT=0;

Common Issues

  • Unsaved changes: When autocommit mode is disabled, any uncommitted changes will be lost if the session is terminated unexpectedly or if a connection reset occurs. It is important to explicitly commit transactions when autocommit mode is disabled.
  • Performance impact: Disabling autocommit mode can impact performance as it introduces additional overhead for managing transactions. For write-heavy workloads, it is recommended to use autocommit mode.

Integration

SET AUTOCOMMIT can be used in conjunction with other MySQL commands, such as:

  • BEGIN: Begins a transaction when autocommit mode is disabled.
  • COMMIT: Commits the current transaction and makes the changes permanent.
  • ROLLBACK: Rolls back the current transaction and discards any uncommitted changes.