As a DBA, implementing a new database consists of a variety of aspects like correct table structure, tuning the stored procedures, creating right indexes, and many more. But all of these items, the stress testing and performance benchmarking play one of the most crucial roles. There are many tools available for stress testing, but they can […]
Find Query with Implicit Conversion in the Plan Cache
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In my previous blog, I discussed about “Which are the queries using a particular index or table?“. Today’s post, I am going to show how you can find all queries with Implicit Conversion in SQL Server. What is an implicit conversion? Implicit conversions occur whenever data with two different data types are being compared. Implicit conversions will often harm […]
Which are the queries using a particular index or table?
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The DMV sys.dm_db_index_usage_stats and sys.dm_db_index_operational_stats give you excellent detailed information about how the indexes are being used and what operations are occurring (select, insert, update, delete) in the database. But they don’t tell you a particular index or table is being used by which all the queries. So, when you want to tune the existing […]
Find Missing Indexes For All SQL Server Databases
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DMV (Database Management View) and DMO (Database Management Objects) were added in 2005. There have been huge improvements in each new edition of SQL Server. It provides us a lot of useful information about SQL Server like – expensive queries, wait type, missing index…., and the list goes on and on… In this blog, I […]
SQL Server Logical Query Processing
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Recently, while reviewing one of the stored procedure performance, I suggested a couple of changes to a developer to improve the performance of the SP. One of the suggestions was to replace DISTINCT with GROUP BY. A few days later, he came back to me with a performance matrix to show that there was no […]
How to Check SQL Server View Utilization
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If you are working on SQL Server optimization delicately, you may get often queries that how to find if any index, table or view is being used in database or not. In recent past, we went live for one of the critical application. The developers decided to check through all the indexes utilization including View indexes […]
How SQL Compilation Can Prove the Server CPU
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It is relatively easy to spot CPU-bound system. But, the source of CPU pressure is not always easy to pinpoint. The CPU can be driven by many factors on the server such as; Memory pressure which is causing SQL Server to continually move data in and out of the memory. Disk latency Bad indexes Poorly […]
SQL Performance – Using Query Hint OPTION (FAST N)
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It is fun working with SQL/Application developer where you exchange a lot of technical thoughts to find the root of the issues. Recently, one of the developers optimized the OLTP system stored procedure by putting the query hint OPTION (FAST ‘N’). But, he was not sure enough about the drawback of the query hint. So, he […]
Finding Input Parameters in an Execution Plan
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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 […]