The following DMV query retrieves the usage statistics for existing indexes. User Seeks – A high number indicates a well utilized index. User Scans – Number of times the index has been scanned. Could indicate improper ordering of the composite columns User Lookups – Indicates a different index was used for criteria and the actual [...]
Archive of posts filed under the DMV Queries category.
Missing Indexes DMV
This query will show the indexes that are missing ordered according to those having the most impact. It will also provide the create index script needed in order to help you create the index. SELECT mid.statement ,migs.avg_total_user_cost * (migs.avg_user_impact / 100.0) * (migs.user_seeks + migs.user_scans) AS improvement_measure,OBJECT_NAME(mid.Object_id), ‘CREATE INDEX [missing_index_' + CONVERT (varchar, mig.index_group_handle) + [...]
Find Long Running Queries
SELECT TOP 10 ObjectName = OBJECT_NAME(qt.objectid) ,DiskReads = qs.total_physical_reads — The worst reads, disk reads ,MemoryReads = qs.total_logical_reads –Logical Reads are memory reads ,Executions = qs.execution_count ,AvgDuration = qs.total_elapsed_time / qs.execution_count ,CPUTime = qs.total_worker_time ,DiskWaitAndCPUTime = qs.total_elapsed_time ,MemoryWrites = qs.max_logical_writes ,DateCached = qs.creation_time ,DatabaseName = DB_Name(qt.dbid) FROM sys.dm_exec_query_stats AS qs CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS qt [...]
Find Queries Taking Most CPU (Processor)
If your box is CPU bound then this is the script you need. The first query will order the results based on the queries that have used the most CPU time since the SQL Server instance has been restarted (or the server has been rebooted). The second query orders the results based upon the average [...]
Find Queries Using Most Memory (IO)
This query returns back the queries that use the most IO. This can mean that either the query is reading from disk more than usual or occupying and utilizing a large amount of buffer cache. These are typical symptoms of queries that do not have the proper indexes or queries that simply read a lot [...]
View Active Connections
With SQL Server 2005+, it is very easy to view the specifics of connection information. This is very useful because when troubleshooting slowdowns. Luckily there are a few dynamic management views that provide insight into connection and session information. The following query groups the connections according the program that is connected to SQL Server. This [...]
Find Dependent Objects
One new feature that SQL Server 2008 offers is more reliable dependency information. SQL Server 2005 offered a DMV (dynamic management view) called sys.sql_dependencies. It is now replaced by a more reliable sys.sql_expression_dependencies. The following script will show all the procedures that reference a given table name, along with the columns the procedure references also. [...]
Find Resource Currently Involved in Blocking
SELECT DISTINCT objname = object_name(p.object_id) FROM sys.partitions p JOIN sys.dm_tran_locks t1 ON p.hobt_id = t1.resource_associated_entity_id Popular search terms:find blocking using dmvfind resource sql server blockingfinding resource in sql blockinghow to find blcoking in sql server using dmvidentify blocking using dmv
Find Queries Using Most CPU
SELECT TOP 5 object_name(objectID) ,[Avg CPU Time] = total_worker_time/execution_count ,execution_count ,Plan_handle ,query_plan FROM sys.dm_exec_query_stats AS qs CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) ORDER BY total_worker_time/execution_count DESC; Popular search terms:microsoft SQL Server identify query using most memorysql server 2005 what consumes most cpufind which mssql query using cputop queries by cpusql server find highest cpu
Find Most Executed Queries
SELECT TOP 50 qs.execution_count ,OBJECT_NAME(objectid) ,query_text = SUBSTRING( qt.text, qs.statement_start_offset/2, (CASE WHEN qs.statement_end_offset = -1 THEN len(convert(nvarchar(max), qt.text)) * 2 ELSE qs.statement_end_offset END – qs.statement_start_offset)/2) ,qt.dbid ,dbname = db_name(qt.dbid) ,qt.objectid FROM sys.dm_exec_query_stats qs CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt ORDER BY qs.execution_count DESC Popular search terms:most executed queriesfind most executed queries sql servermost executed query sql [...]
