After a network outage, queries stayed in KILLED/ROLLBACK with the undocumented wait PREEMPTIVE_OLEDB_RELEASE. What I saw and how to clear them.
SQL Server emergency? Email pinal@sqlauthority.com with URGENT in the subject line.
Specified Driver Is Invalid in SQL Server Setup: Error 0x84BB0001
The specified driver is invalid error stopped a SQL Server 2012 installation with code 0x84BB0001. The real clue sat in Detail.txt, in the performance counter files, and a fresh copy of the media fixed it. This post shows how to read the logs, check the counter files and confirm the media.
SQL SERVER – SQL Browser not Starting. Error – The SQL Configuration for SQL is Inaccessible or Invalid
After server hardening, SQL Browser would not start and the event log said the SQL configuration for SQL is inaccessible or invalid. Here is the fix.
Why to Use SQL Server Configuration Manager Over Services applet (services.msc)? – Interview Question of the Week #112
Why use SQL Server Configuration Manager Over Services applet (services.msc) to change a service account? The reasons, from permissions to passwords.
SQL SERVER – How to Apply Patch in AlwaysOn Availability Group Configuration?
A Patch in AlwaysOn Availability Group needs a sequence matched to the topology. I start this two-replica example with the secondary.
Number of Cluster Nodes Error: Add Node Fails on Enterprise Edition
The number of cluster nodes error stopped a client from adding a second node, even on Enterprise edition. Detail.txt showed the edition as Invalid. The file setup uses to read the edition was missing from the Shared folder.
SQL SERVER – Unable to See Tables (Objects) in SSMS
A client could query a table but was unable to see tables in SSMS Object Explorer. A DENY permission was the cause. Here is how I tracked it down.
SQL Server slow? Let's fix it together in about four hours.
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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.

