A wait stats collection script saves snapshots of sys.dm_os_wait_stats into a table, so you can compare two snapshots instead of reading totals since the last restart. This post builds the tables and a snapshot procedure, creates a small load, and reports the change with a category for each wait. It also covers idle waits, restarts and retention.
SQL SERVER – Get Wait Stats Related to Specific Session ID With sys.dm_exec_session_wait_stats
From SQL Server 2016, sys.dm_exec_session_wait_stats shows wait stats for a specific session ID. Here is how to use it, and why it fails on older versions.
What is the Biggest Limitation of ISDATE() Function? – Interview Question of the Week #137
Why does ISDATE(‘6666-04-30’) return 1 but ISDATE(‘1111-04-30’) return 0? Here are what I see as the two biggest limitations of the ISDATE() function.
SQL Server Management Studio (SSMS) – Unable to Connect to SSIS – The Specified Service Does Not Exist as an Installed Service
After installing SSMS 17.2, I was unable to connect to SSIS on my machine. The error said the specified service does not exist, which was misleading.
SCOM – Alert: SQL Server Cannot Authenticate Using Kerberos Because the Service Principal Name (SPN) is Missing, Misplaced, or Duplicated
SCOM warned that SQL Server cannot use Kerberos because the Service Principal Name (SPN) is missing. Here is how I checked and fixed the SPNs for a client.
SQL SERVER – Puzzle – Write a Shortest Code to Produce Zero
This Zero puzzle asks for the shortest SQL Server code within three restrictions. I want the exact code and character count.
SQL SERVER – Learning DATEDIFF_BIG Function in SQL Server 2016
DATEDIFF returns INT and overflows with Msg 535 on large ranges. SQL Server 2016 adds DATEDIFF_BIG, which returns BIGINT. Here is a simple example.