The query execution plan is a map of work which SQL Server is going to perform to execute a query. It provides a lot of useful information like operators, cost, estimated rows, actual rows, predicate details, parallelism, and much more information to troubleshoot the performance issue. During the troubleshooting of the performance issues, I would […]
Figuring out Time-Out Prone queries
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Recently, I was helping one of the community attendees on the SQL Server Query Time-Out issue. Once we are done with troubleshooting, he asked a very excellent question; “I am dealing with very critical OLTP systems. As my company has been expanding the business, the data is rapidly growing. It is causing a lot of […]
Getting Query Execution Statistics
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If you hate things that are slow, I bet you certainly want to know the reason for the slowness. So, if you are SQL Developer and your query run slow, you would prefer to have query execution statistics so that you can figure out what causing the query to run slow. To get the query execution statistics, […]
Over-Indexing can hurt your SQL Server performance
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Indexes are a vast subject and well documented elsewhere on the web. But, it is still a very commonly asked topic. In order to improve your queries (applications) and databases performance, we create indexes. But those created indexes may not be very useful over the period because of your application requirement changes, the queries against […]
Top Function – Performance Gain
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Recently, I presented at Singapore SQL Pass Chapter on the topic T-SQL Fun, and the most of the attendees were a developer. During the session, I discussed TOP function, and I throw a question to the audience – “Not using Top function especially when you can use it – Can it cause performance problem or […]