| The wait type PREEMPTIVE_OS_FILEOPS is ranked #57 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. The PREEMPTIVE_OS_FILEOPS wait type in SQL Server indicates that a task is waiting on a file operation performed by the operating system. This wait type typically occurs when a query is accessing data or files that are located outside of the SQL Server instance, such as on a network share or in the file system. When a query is executed in SQL Server, it is compiled into an execution plan by the query optimizer. The execution plan specifies the sequence of operations that SQL Server will use to retrieve the requested data. If the query involves accessing data or files that are located outside of the SQL Server instance, the execution plan will include a reference to the external resource. When the query is executed, SQL Server will send a request to the operating system to access the external resource. The PREEMPTIVE_OS_FILEOPS wait type occurs while SQL Server is waiting for the operating system to complete the file operation and return the requested data. The presence of the PREEMPTIVE_OS_FILEOPS wait type does not necessarily indicate a problem with SQL Server. However, if this wait type is occurring frequently and for long periods of time, it could indicate that the queries being executed are accessing external resources that are slow or heavily utilized. In these cases, it may be necessary to optimize the queries or to add additional hardware resources to improve performance. In summary, the PREEMPTIVE_OS_FILEOPS wait type in SQL Server indicates that a task is waiting on a file operation performed by the operating system. While this is a normal part of the operation of SQL Server, frequent occurrences of this wait type could indicate a potential performance issue that should be addressed. Applies toRelated WaitsPREEMPTIVE_COM_QUERYINTERFACEPREEMPTIVE_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_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_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 |  |