By Ian W. Stirk

SQL Server DMVs in motion indicates you ways to procure, interpret, and act at the info captured by means of DMVs to maintain your procedure in most sensible form. The over a hundred code examples assist you grasp DMVs and provides you an immediately reusable SQL library. you will additionally discover ways to use Dynamic administration services (DMFs), which offer extra info that make it easier to enhance your system's functionality and future health.

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You saw earlier, in the section titled “Quickly find a cached plan,” how you can use a cached plan to target the area costing the most in terms of performance. 3 Indexes Perhaps the main tool for improving the performance of your queries is the index. ). Additionally, indexes are also useful for sorting and providing unique constraints. The DMVs record many index-related details, including how often an index is used, how it’s used (as part of a scan, as a lookup, by the application, or by system routines), whether it isn’t used at all, any concurrency problems accessing the indexes, and details of any missing indexes.

These DMVs contain information relating to various aspects of Service Broker, including activated tasks, forwarded messages, connections, and queue monitors. SQL Server Operating System These DMVs contain information relating to various aspects of the SQL Server Operating System (SQLOS), including performance counters, memory pools, schedulers, system information, tasks, threads, wait statistics, waiting tasks, and memory objects. Transaction These DMVs contain information relating to various aspects of transactions, including snapshot, database, session, and locks.

But before you can dive into using DMVs, you need to ensure that you’re aware of certain prerequisites. The first of these relates to permissions to the DMVs/DMFs, and the second relates to circumstances under which you might want to clear the DMVs. 1 Permissions There are two levels of DMV and DMF usage, namely, server-scoped and database-scoped. Server-scoped requires VIEW SERVER STATE permission on the server, and databasescoped requires VIEW DATABASE STATE permission on the database. Granting VIEW SERVER STATE permission infers VIEW DATABASE STATE permission on all the databases on the server.

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