Wait Type PREEMPTIVE_OS_CLOSEHANDLE

The wait type PREEMPTIVE_OS_CLOSEHANDLE is ranked #63 by Stedman Solutions and Database Health Monitor.

Wait statistics, in the context of SQL Server, refer to the amount of time that a query spends waiting to access data in the database. When a client application requests data from the database, the request is placed in a queue and the client application must wait for its turn to access the data. The time that the query spends waiting is called a "wait" and is tracked by SQL Server. This information can be used to identify potential performance bottlenecks and optimize the performance of the database. Wait statistics are commonly used by database administrators to diagnose and troubleshoot performance issues in SQL Server.


In order to ensure that data is accessed efficiently and consistently, SQL Server uses various "wait types" to manage how requests for data are processed.

One of these wait types is called PREEMPTIVE_OS_CLOSEHANDLE. This wait type is triggered when SQL Server is attempting to close a handle to a file or other resource and is waiting for the operating system (OS) to complete the operation.

A "handle" is a reference to a file or other resource that is managed by the OS. When a SQL Server process needs to access a file or resource, it must first open a handle to it. This allows the process to read from or write to the file or resource. Once the process is finished, it must then close the handle to release the resources that were being used.

The process of closing a handle can sometimes take some time, depending on the type and size of the file or resource. In these cases, the SQL Server process will wait for the OS to complete the handle closure before it can continue with its work. This waiting is what is known as a PREEMPTIVE_OS_CLOSEHANDLE wait.

While the PREEMPTIVE_OS_CLOSEHANDLE wait type is generally not a cause for concern, it can sometimes indicate a performance issue if it is occurring frequently or for long periods of time. In these cases, it may be necessary to investigate the cause of the issue and take steps to improve performance, such as optimizing the handle closure process or increasing the systems resources.

Overall, the PREEMPTIVE_OS_CLOSEHANDLE wait type is an important part of how SQL Server manages requests to close handles to files and resources. By understanding this wait type and its potential impact on performance, database administrators can ensure that their systems are running efficiently and effectively.

Applies to

Related Waits

PREEMPTIVE_COM_QUERYINTERFACE
PREEMPTIVE_FILESIZEGET
PREEMPTIVE_HADR_LEASE_MECHANISM
PREEMPTIVE_OLEDBOPS
PREEMPTIVE_OS_AUTHENTICATIONOPS
PREEMPTIVE_OS_AUTHORIZATIONOPS
PREEMPTIVE_OS_AUTHZGETINFORMATIO
PREEMPTIVE_OS_AUTHZINITIALIZECON
PREEMPTIVE_OS_AUTHZINITIALIZERES
PREEMPTIVE_OS_BACKUPREAD
PREEMPTIVE_OS_CLUSTEROPS
PREEMPTIVE_OS_CREATEFILE
PREEMPTIVE_OS_CRYPTACQUIRECONTEX
PREEMPTIVE_OS_CRYPTIMPORTKEY
PREEMPTIVE_OS_CRYPTOPS
PREEMPTIVE_OS_DELETEFILE
PREEMPTIVE_OS_DEVICEOPS
PREEMPTIVE_OS_DTCOPS
PREEMPTIVE_OS_ENCRYPTMESSAGE
PREEMPTIVE_OS_FILEOPS
PREEMPTIVE_OS_FLUSHFILEBUFFERS
PREEMPTIVE_OS_GENERICOPS
PREEMPTIVE_OS_GETCOMPRESSEDFILES
PREEMPTIVE_OS_GETDISKFREESPACE
PREEMPTIVE_OS_GETFILEATTRIBUTES
PREEMPTIVE_OS_GETFINALFILEPATHBY
PREEMPTIVE_OS_GETPROCADDRESS
PREEMPTIVE_OS_LIBRARYOPS
PREEMPTIVE_OS_LOADLIBRARY
PREEMPTIVE_OS_LOOKUPACCOUNTSID
PREEMPTIVE_OS_MOVEFILE
PREEMPTIVE_OS_NETVALIDATEPASSWOR
PREEMPTIVE_OS_PIPEOPS
PREEMPTIVE_OS_QUERYREGISTRY
PREEMPTIVE_OS_REPORTEVENT
PREEMPTIVE_OS_REVERTTOSELF
PREEMPTIVE_OS_SECURITYOPS
PREEMPTIVE_OS_SERVICEOPS
PREEMPTIVE_OS_SQLCLROPS
PREEMPTIVE_OS_WAITFORSINGLEOBJEC
PREEMPTIVE_OS_WRITEFILEGATHER
PREEMPTIVE_XE_CALLBACKEXECUTE
PREEMPTIVE_XE_GETTARGETSTATE
PREEMPTIVE_XE_SESSIONCOMMIT
PREEMPTIVE_XE_TARGETFINALIZE
PREEMPTIVE_XE_TARGETINIT

See Also


All Wait Types