sql-server-latches-object.md

title	SQL Server, Latches Object | Microsoft Docs
description	Learn about the SQLServer:Latches object, which provides counters to monitor internal SQL Server resource locks called latches.
ms.custom
ms.date	03/14/2017
ms.prod	sql
ms.prod_service	database-engine
ms.reviewer
ms.technology	performance
ms.topic	conceptual
helpviewer_keywords	Latches object SQLServer:Latches
ms.assetid	2393ea1c-2bf3-41c3-9f37-b9761144eeca
author	WilliamDAssafMSFT
ms.author	wiassaf

SQL Server, Latches Object

[!INCLUDE SQL Server] The SQLServer:Latches object in Microsoft [!INCLUDEssNoVersion] provides counters to monitor internal [!INCLUDEssNoVersion] resource locks called latches. Monitoring the latches to determine user activity and resource usage can help you to identify performance bottlenecks.

This table describes the [!INCLUDEssNoVersion] Latches counters.

SQL Server Latches counters	Description
Average Latch Wait Time (ms)	Average latch wait time (in milliseconds) for latch requests that had to wait.
Average Latch Wait Time Base	For internal use only.
Latch Waits/sec	Number of latch requests that could not be granted immediately.
Number of SuperLatches	Number of latches that are currently SuperLatches.
SuperLatch Demotions/sec	Number of SuperLatches that have been demoted to regular latches in the last second.
SuperLatch Promotions/sec	Number of latches that have been promoted to SuperLatches in the last second.
Total Latch Wait Time (ms)	Total latch wait time (in milliseconds) for latch requests in the last second.

See Also

Monitor Resource Usage (System Monitor)