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SQL Diagnostic Manager allows you to monitor your tempdb database with a = number of charts and alerts to help you avoid costly performance issues cau= sed by a full tempdb. The tempdb system database is a workspace used to hol= d temporary user objects, results created through queries and sorts, and ot= her objects created by the SQL Server Database Engine. Because of the large= amount of data stored in tempdb, users can run out of disk space, which ca= uses the entire server and all of its databases to become unresponsive. SQL= Diagnostic Manager seeks to resolve some of these issues by providing a mo= nitoring solution that features a series of tempdb-specific charts, views, = and alerts.
The te= mpdb system database, along with the Master, Model, and MSDB databases, is = provided by default with SQL Server and is a shared resource available to a= ll users connected to a single SQL Server instance. Each time you start SQL= Server, it re-creates tempdb based on the Model database. Tempdb can fill = up quickly when you are low on disk space or have a low maximum size for da= tabase growth. Certain workloads may cause excessive space usage or create = contention in tempdb, which can affect performance on the entire server.
Tempdb monitoring is supported o= n SQL Server 2005 and above servers only.
The te= mpdb version store collects the data necessary to support row versioning. E= ach time a data value changes, a new version of the row is created and stor= ed for as long as the oldest active transaction needs to access it. Once th= e row version is no longer needed it is removed from tempdb by a cleanup jo= b which runs once per minute. As a result, long-running transactions preven= t cleanup of older entries into the tempdb version store, causing grow= th which can affect performance and cause tempdb to run out of space.
Tempdb= resource contention or waits is usually the result of heavy use on too few= tempdb files and occurs when the system attempts to allocate pages. T= he tempdb contention chart displays latch wait time (in milliseconds) for t= he allocation pages of tempdb. The three tracked allocation page types are:=
Latch = contention of this sort is usually an indication that you should create mor= e tempdb data files. In some situations, using Trace Flag 1118 may also all= eviate tempdb contention.
Tempdb= includes the following specific alerts: