LIVE Troubleshooting on Production Server – Plan Cache Bloating
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LIVE Troubleshooting on Production Server – Physical vs Logical IO
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SARGability and Selectivity in SQL Server
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Finding Expensive Lookups in SQL Server
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Why are Missing Index Hints Missing
This blog post first appeared on SQLMaestros. Let’s understand a few reasons why SQL Server (sometimes) does not show missing index hints. We are using AdventureWorks2016 database for the demo. Let’s make a copy of Sales.Customer table as Sales.CustomerDup SELECT * INTO sales.customerdup FROM sales.customer Before jumping into the actual query, have a look at [...]
Extended Events Tips & Tricks (GUI)
This blog post first appeared on SQLMaestros. In this video blog post, you will see a couple of tips and tricks related to SQL Server Extended Events Graphical User Interface. You will learn things like, Filtering, Grouping, Aggregation, Bookmarks, Saving/Opening Settings, Exporting XEvents data to a table, and more. Overall, the idea is to show you [...]
SSMS & ADS – July 2020 Release
This blog post first appeared on SQLMaestros SQL Server Management Studio 18.6 and Azure Data Studio July 2020 release, 1.20. Your favourite SSMS has been updated again. Version 18.6 is released. The long pending Database Diagram issue has been fixed along with couple of other fixes. There are new features too. Checkout the release notes. For [...]
Double Read – Reading The Same Record Twice
In this blog post, we will observe Double Read Phenomenon in SQL Server. You will see how the same record is read twice in a single SELECT query/operation. First watch this video. Now, explanation. So why does this happen? Let’s go step by step. Step 1 First, user 1 fires an UPDATE in an explicit [...]
Script: Find Top 10 CPU Intensive Queries
This blog post first appeared on SQLMaestros If you want to find the top ‘n’ queries that are currently in the cache, which are consuming more CPU, then you are at the right place. sys.dm_exec_query_stats DMV contains all the information about the resource (CPU, Memory, I/O) consuming queries that are currently in the cache. We [...]
Script: How to Identify Whether Optimizer is Reusing the Plans or Not
This blog post first appeared on SQLMaestros If you want to identify non parameterized queries that are hogging your SQL Server plan cache then you are at the right place. sys.dm_exec_query_stats DMV becomes very handy when we are looking out for statistical information related to queries. Upon executing the above DMV, we will see a [...]