SET LOCK_TIMEOUT (Transact-SQL)

Makale
03.09.2024

Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW)

Specifies the number of milliseconds a statement waits for a lock to be released.

Transact-SQL syntax conventions

Syntax

syntaxsql

SET LOCK_TIMEOUT timeout_period

Arguments

timeout_period
Is the number of milliseconds that will pass before Microsoft SQL Server returns a locking error. A value of -1 (default) indicates no time-out period (that is, wait forever).

When a wait for a lock exceeds the time-out value, an error is returned. A value of 0 means to not wait at all and return a message as soon as a lock is encountered.

Remarks

At the beginning of a connection, this setting has a value of -1. After it is changed, the new setting stays in effect for the remainder of the connection.

The setting of SET LOCK_TIMEOUT is set at execute or run time and not at parse time.

The READPAST locking hint provides an alternative to this SET option.

CREATE DATABASE, ALTER DATABASE, and DROP DATABASE statements do not honor the SET LOCK_TIMEOUT setting.

Permissions

Requires membership in the public role.

Examples

A: Set the lock timeout to 1800 milliseconds

The following example sets the lock time-out period to 1800 milliseconds.

SQL

SET LOCK_TIMEOUT 1800;  
GO

Examples: Azure Synapse Analytics and Analytics Platform System (PDW)

B. Set the lock timeout to wait forever for a lock to be released.

The following example sets the lock timeout to wait forever and never expire. This is the default behavior that is already set at the beginning of each connection.

SQL

SET LOCK_TIMEOUT -1;

The following example sets the lock time-out period to 1800 milliseconds. In this release, Azure Synapse Analytics will parse the statement successfully, but will ignore the value 1800 and continue to use the default behavior.

SQL

SET LOCK_TIMEOUT 1800;

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