Access to a local SQL Server or download SQL Server Express for free from Microsoft.Course Will Cover:īasic select, inner join, left outer join, right outer join, semi join, anti semi join, left outer join w/ exclusion, right outer join with exclusion, full outer join, cross join, cross apply, outer apply, equi vs non equi join, two inner joins, full outer join w/ exclusion, inner and outer join, except, intersect and union. Intended for database programmers and new administrators who are familiar with TRANSACT SQL, may know simple joins, who would like to know more about OUTER JOINS, LEFT JOINS, RIGHT JOINS, CROSS JOINS, and SELF JOINS. She primarily focuses on the database domain, helping clients build short and long term multi-channel campaigns to drive leads for their sales pipeline.Learn more and enroll today! Improve your SQL query skills by learning how to connect tables with different JOIN types. Nupur Dave is a social media enthusiast and an independent consultant. If you need help with any SQL Server Performance Tuning Issues, please feel free to reach out at is also a CrossFit Level 1 Trainer (CF-L1) and CrossFit Level 2 Trainer (CF-L2). Pinal is an experienced and dedicated professional with a deep commitment to flawless customer service. To freely share his knowledge and help others build their expertise, Pinal has also written more than 5,500 database tech articles on his blog at. Pinal has authored 13 SQL Server database books and 40 Pluralsight courses. He holds a Masters of Science degree and numerous database certifications. Pinal Dave is an SQL Server Performance Tuning Expert and independent consultant with over 17 years of hands-on experience. Note: It goes without saying, please test all the script on your development server and after they pass your test, deploy them on production server. If you need further help with this script, do leave a comment or send me email at my email address. ON dm_mig.index_handle = dm_mid.index_handle INNER JOIN sys.dm_db_missing_index_details dm_mid ON dm_oup_handle = dm_mig.index_group_handle INNER JOIN sys.dm_db_missing_index_group_stats dm_migs + ISNULL (' INCLUDE (' + dm_mid.included_columns + ')', '') AS Create_StatementįROM sys.dm_db_missing_index_groups dm_mig + CASE WHEN dm_mid.equality_columns IS NOT NULL AND dm_mid.inequality_columns + ' (' + ISNULL (dm_mid.equality_columns,'') + REPLACE(REPLACE(REPLACE(ISNULL(dm_mid.equality_columns,''),', ','_'),'','')ĪND dm_mid.inequality_columns IS NOT NULL THEN '_' 'CREATE INDEX [IX_' + OBJECT_NAME(dm_mid.OBJECT_ID,dm_mid.database_id) + '_' OBJECT_NAME(dm_mid.OBJECT_ID,dm_mid.database_id) AS , The index creation script is also provided in the last column.ĭm_migs.avg_user_impact*(dm_er_seeks+dm_er_scans) Avg_Estimated_Impact,ĭm_migs.last_user_seek AS Last_User_Seek, You should pay attention to Avg_Estimated_Impact when you are going to create an index. Additionally, this script sometime does not give accurate information so use your common sense.Īnyway, the scripts is a good starting point. You should not create more than 5-10 indexes per table. Please note, if you should not create all the missing indexes this script suggest. In this blog post we will discuss about Missing Index. Here is the script from my script bank, which I use to identify missing indexes on any database. A proper index can improve the performance and a bad index can hamper the performance. Performance Tuning is quite interesting and Index plays a vital role in it.
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