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AND c.index_id = i.index_id WHERE c.writes >= c.reads; END GO
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Note that because the read and write metrics are per operation, not per row, a DML operation that affects 100 rows will only count as one user update in this view.
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The table-valued function in listing 8 will return the top n queries, ordered in descending order by longest average CPU time, longest average elapsed time, highest average reads, highest logical reads, highest writes, or highest number of executions. Because this one query does not rely on database-specific catalog views, it can be created in the utility database and called from anywhere (passing database name, number of rows, and ordering preference). You can also add a WHERE clause to restrict the result set to objects matching a certain naming pattern or queries that executed at least n times.
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Listing 8 Finding inefficient queries
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USE AB_Utility; GO IF OBJECT_ID(N'dbo.AB_GetInefficientQueries', N'IF') IS NOT NULL DROP FUNCTION dbo.AB_GetInefficientQueries; GO CREATE FUNCTION dbo.AB_GetInefficientQueries ( @database_name SYSNAME, @number_of_rows INT, @order_by VARCHAR(15) ) RETURNS TABLE AS RETURN ( SELECT TOP (@number_of_rows) * FROM ( SELECT exec_object = AB_Utility.dbo.AB_GetTwoPartName( est.objectid, est.[dbid]), exec_statement = AB_Utility.dbo.AB_ParseSQLText(est.[text], qs.statement_start_offset, qs.statement_end_offset ), u.sqlserver_start_time, uptime_minutes = u.uptime, execution_count, first_execution_time = qs.creation_time, qs.last_execution_time, avg_cpu_time_milliseconds = qs.total_worker_time / (1000 * qs.execution_count), avg_logical_reads = qs.total_logical_reads / qs.execution_count,
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avg_physical_reads = qs.total_physical_reads / qs.execution_count, avg_writes = qs.total_logical_writes / qs.execution_count, avg_elapsed_time_milliseconds = qs.total_elapsed_time / (1000 * qs.execution_count) FROM sys.dm_exec_query_stats AS qs CROSS APPLY sys.dm_exec_sql_text(qs.[sql_handle]) AS est CROSS JOIN AB_Utility.dbo.AB_Uptime() AS u WHERE est.[dbid] = DB_ID(@database_name) ) x ORDER BY CASE @order_by WHEN 'cpu time' THEN avg_cpu_time_milliseconds WHEN 'logical reads' THEN avg_logical_reads WHEN 'physical reads' THEN avg_physical_reads WHEN 'writes' THEN avg_writes WHEN 'elapsed time' THEN avg_elapsed_time_milliseconds WHEN 'executions' THEN execution_count END DESC, exec_object ); GO USE [tempdb]; GO SELECT * FROM AB_Utility.dbo.AB_GetInefficientQueries ( 'msdb', 50, 'cpu time' ) -- WHERE exec_object NOT LIKE '%sp_get_composite_job_info%' -- WHERE execution_count >= 50;
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Starting with SQL Server 2005, the database engine started keeping track of indexes that the optimizer would have taken advantage of, if they existed. The missing index DMVs should be used only as a guide, and not as the final authority on how you should change your index structures. (As with other DMVs, the data does not persist between restarts. Also, be careful about relying on data for tables with indexes that have changed recently, as this can also clear out missing index information.) The function in listing 9 will return a slightly more useful output structure to help you determine which tables and indexes you should further investigate for fine tuning. This includes information about how long SQL Server has been up, when the last user seek or scan was for that specific query (because it may represent an ad hoc query outside of your normal workload), and the CREATE INDEX DDL if you wanted to follow through with the
My favorite DMVs, and why
suggestion. To use the function, you pass in the database name and the number of rows you want to return.
Listing 9 Finding missing indexes
USE AB_Utility; GO IF OBJECT_ID(N'dbo.AB_GetMissingIndexes', N'IF') IS NOT NULL DROP FUNCTION dbo.AB_GetMissingIndexes GO CREATE FUNCTION dbo.AB_GetMissingIndexes ( @database_name SYSNAME, @number_of_rows INT ) RETURNS TABLE AS RETURN ( SELECT TOP (@number_of_rows) *, -- must give credit to Tibor Karazsi here: [statement] = 'CREATE INDEX [<<index name>>]' + ' ON ' + [table] + ' (' + COALESCE(eq + COALESCE(', ' + iq, ''), iq) + ')' + COALESCE(' INCLUDE(' + ic + ');', ';') FROM ( SELECT [table] = AB_Utility.dbo.AB_GetTwoPartName( d.[object_id], d.database_id), eq = d.equality_columns, iq = d.inequality_columns, ic = d.included_columns, relative_benefit = (s.user_seeks + s.user_scans) * (s.avg_total_user_cost * s.avg_user_impact), s.user_seeks, s.user_scans, s.last_user_seek, s.last_user_scan FROM sys.dm_db_missing_index_details AS d INNER JOIN sys.dm_db_missing_index_groups AS g ON d.index_handle = g.index_handle INNER JOIN sys.dm_db_missing_index_group_stats AS s ON g.index_group_handle = s.group_handle WHERE d.database_id = DB_ID(@database_name) ) x CROSS JOIN AB_Utility.dbo.AB_Uptime() ORDER BY relative_benefit DESC );
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