| The wait type PREEMPTIVE_FILE_MAPPING is ranked #86 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. What Are Wait Types?Wait types in SQL Server are like little flags that show what the server is waiting for before it can complete a task. Picture a chef waiting for an oven to preheat�it�s not a problem unless the delay happens too often or takes too long. Wait types help you figure out where SQL Server is getting held up. What Does PREEMPTIVE_FILE_MAPPING Mean?The PREEMPTIVE_FILE_MAPPING wait type pops up when SQL Server needs to work with the operating system to handle file operations, specifically something called "memory-mapped files." These are files�like database files�that SQL Server maps into memory to read or write data more efficiently. The �PREEMPTIVE� part means SQL Server steps outside its usual routine and lets the operating system take over for a bit to manage this. Simply put, this wait happens when SQL Server is busy setting up or adjusting how it accesses its files through memory. It�s a normal part of managing database files, but it involves coordination with the operating system, which can take a little time. Why Should You Care?Seeing PREEMPTIVE_FILE_MAPPING occasionally isn�t a big deal�it�s just SQL Server doing its job. But if this wait type shows up a lot or lasts longer than usual, it might point to an issue. Maybe the disk is slow, or there�s a bottleneck in how memory is being used. That could slow down your queries and make the whole server feel sluggish. How to Track ItTo keep tabs on this wait type, you�ll want a tool that monitors SQL Server waits over time. The Historic Waits monitoring feature in Database Health Monitor is a great choice. It records details about waits like PREEMPTIVE_FILE_MAPPING, showing you when they occur, how long they stick around, and how frequent they are. This helps you spot if file mapping is causing delays worth investigating. Wait types like PREEMPTIVE_FILE_MAPPING give you a peek into what�s slowing down your SQL Server. By understanding and monitoring them, you can keep your database running smoothly. For a reliable way to track waits and optimize performance, give Database Health Monitor a try�it�s a go-to tool for DBAs looking to stay on top of SQL Server health.
Applies toRelated WaitsPREEMPTIVE_CLUSAPI_CLUSTERRESOURPREEMPTIVE_COM_COCREATEINSTANCE PREEMPTIVE_COM_CREATEACCESSOR PREEMPTIVE_COM_GETDATA PREEMPTIVE_COM_QUERYINTERFACE PREEMPTIVE_COM_RELEASE PREEMPTIVE_COM_RELEASEROWS PREEMPTIVE_COM_SEQSTRMREAD PREEMPTIVE_COM_SETPARAMETERINFO PREEMPTIVE_COM_SETPARAMETERPROPE PREEMPTIVE_DTC_BEGINTRANSACTION PREEMPTIVE_FILESIZEGET PREEMPTIVE_HADR_LEASE_MECHANISM PREEMPTIVE_OLEDB_RELEASE 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_DEVICEIOCONTROL 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_LOGONUSER 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_SETFILEVALIDDATA PREEMPTIVE_OS_SQLCLROPS PREEMPTIVE_OS_VERIFYTRUST PREEMPTIVE_OS_WAITFORSINGLEOBJEC PREEMPTIVE_OS_WRITEFILE PREEMPTIVE_OS_WRITEFILEGATHER PREEMPTIVE_SERVICE_CONTROL_MANAGE PREEMPTIVE_SERVICE_CONTROL_MANGE PREEMPTIVE_SHAREDMEM_GETDATA PREEMPTIVE_XE_CALLBACKEXECUTE PREEMPTIVE_XE_DISPATCHER PREEMPTIVE_XE_GETTARGETSTATE PREEMPTIVE_XE_SESSIONCOMMIT PREEMPTIVE_XE_TARGETFINALIZE PREEMPTIVE_XE_TARGETINIT All Wait Types |  |
