| The wait type PREEMPTIVE_COM_QUERYINTERFACE is ranked #37 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_COM_QUERYINTERFACE. This wait type is triggered when SQL Server is using a component object model (COM) component and is waiting for the component to respond to a query for information about its capabilities or interfaces. COM is a technology that allows different software components to communicate and interact with each other. SQL Server makes use of COM components in various ways, such as to access data from external sources or to perform specific tasks. When SQL Server needs to use a COM component, it must first query the component to determine what interfaces and capabilities it has. This is known as querying the components interface. The component then responds to the query and provides the requested information. However, the process of querying a COM components interface can sometimes take some time, depending on the complexity of the component and the amount of information being requested. In these cases, the SQL Server process will wait for the component to respond to the query before it can continue with its work. This waiting is what is known as a PREEMPTIVE_COM_QUERYINTERFACE wait. While the PREEMPTIVE_COM_QUERYINTERFACE 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 query interface process or increasing the systems resources. Overall, the PREEMPTIVE_COM_QUERYINTERFACE wait type is an important part of how SQL Server uses COM components to access data and perform tasks. By understanding this wait type and its potential impact on performance, database administrators can ensure that their systems are running efficiently and effectively. Applies toRelated WaitsPREEMPTIVE_FILESIZEGETPREEMPTIVE_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_CLOSEHANDLE 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 AlsoAll Wait Types |  |