idle-transact-sql.md

title	@@IDLE (Transact-SQL) | Microsoft Docs
ms.custom
ms.date	09/18/2017
ms.prod	sql
ms.prod_service	sql-database
ms.reviewer
ms.technology	t-sql
ms.topic	language-reference
f1_keywords	@@IDLE_TSQL @@IDLE
dev_langs	TSQL
helpviewer_keywords	time [SQL Server], idle ticks [SQL Server] @@IDLE function status information [SQL Server], idle time idle time [SQL Server]
ms.assetid	8f49c62a-8da5-4afd-a5eb-4df8ef8be755
author	MikeRayMSFT
ms.author	mikeray

@@IDLE (Transact-SQL)

[!INCLUDEtsql-appliesto-ss2008-xxxx-xxxx-xxx-md]

Returns the time that [!INCLUDEssNoVersion] has been idle since it was last started. The result is in CPU time increments, or "ticks," and is cumulative for all CPUs, so it may exceed the actual elapsed time. Multiply by @@TIMETICKS to convert to microseconds.

Note

If the time returned in @@CPU_BUSY, or @@IO_BUSY exceeds approximately 49 days of cumulative CPU time, you receive an arithmetic overflow warning. In that case, the value of @@CPU_BUSY, @@IO_BUSY and @@IDLE variables are not accurate.

Transact-SQL Syntax Conventions

Syntax

@@IDLE  

Return Types

integer

Remarks

To display a report containing several [!INCLUDEssNoVersion] statistics, run sp_monitor.

Examples

The following example shows returning the number of milliseconds [!INCLUDEssNoVersion] was idle between the start time and the current time. To avoid arithmetic overflow when converting the value to microseconds, the example converts one of the values to the float data type.

SELECT @@IDLE * CAST(@@TIMETICKS AS float) AS 'Idle microseconds',  
   GETDATE() AS 'as of';  

[!INCLUDEssResult]

I  
Idle microseconds  as of                   
----------------- ----------------------  
8199934           12/5/2006 10:23:00 AM   

See Also

@@CPU_BUSY (Transact-SQL)
sp_monitor (Transact-SQL)
@@IO_BUSY (Transact-SQL)
System Statistical Functions (Transact-SQL)