Question: Why Query Store Actual Operation Mode is Not Same as Requested? Query Regression (poor performing queries, once working great)
SQL Server emergency? Email pinal@sqlauthority.com with URGENT in the subject line.
Session Wait Stats: Find the Query Behind a Wait Type
Session wait stats tell you which session produced a wait type, and the input buffer tells you which query that session ran. This post shows how to see who waits right now, how to read the wait history of each session, and how to join them to the query text. It also explains the THREADPOOL wait.
SQL SERVER – Upgrade Rule Failure Error: No Custom Security Extensions
Let us learn about upgrade the rule failure error in this blog post and learn how we can fix the error. Locate RSReportServer.config
Parallel Plans: Reading Gather Streams and Repartition Streams
Read Gather Streams and other parallel exchanges, inspect rows per thread and spill evidence, and relate exchange waits to actual work.
Does GROUP BY Sort Results? Only ORDER BY Guarantees It
Does GROUP BY sort the rows it returns? No: only ORDER BY guarantees an order. This post builds a small demo, shows one GROUP BY query returning two different orders, and reads the plans that explain why.
SQL SERVER – Upgrade Error: The Specified Service Does Not Exist as an Installed Service
An upgrade from SQL Server 2008 R2 to 2014 failed after the product key step with: the specified service does not exist. Here is the fix.
SQL SERVER – Log Shipping Error: Only Members of the Sysadmin Fixed Server Role Can Perform This Operation
They have observed that Log Shipping Copy and Log Shipping Restore jobs have been failing with log shipping error. Let us fix them.
SQL Server slow? Let's fix it together in about four hours.
In my Comprehensive Database Performance Health Check, you share your screen, I guide you, and we fix your biggest performance troublemakers. No passwords. No remote access.
You keep every script, and the know-how to fix it yourself next time.
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Over 400 customers have worked with me this way, and not one shared a password. See all consulting options.
Who We Are
Pinal Dave is an SQL Server Performance Tuning Expert and independent consultant with over 24 years of hands-on experience. He holds a Masters of Science degree and numerous database certifications.
Pinal has authored 19 books and 125 Pluralsight courses. To freely share his knowledge and help others build their expertise, Pinal has also written more than 5,800 database tech articles on his blog at https://blog.sqlauthority.com.
Pinal is also a CrossFit Level 1 Trainer (CF-L1) and CrossFit Level 2 Trainer (CF-L2).
Nupur Dave is a social media enthusiast and an independent consultant. She primarily focuses on the database domain, helping clients build short and long-term multi-channel campaigns to drive leads for their sales pipeline.
Shaivi Pinalkumar Dave is a book author and a women’s artistic gymnast.

