To index a computed column, define the formula once on the table and create a normal index on it. This post loads 200,000 rows, shows the scan, then the seek after the index, and tests the rules that decide whether SQL Server accepts the column.
Reading the Connectivity Ring Buffer for Dropped Connections
The error log says nothing, but the connectivity ring buffer may remember. Here is how to read it and what it cannot tell you.
Size and Rows of Each Table in SQL Server, Indexes Included
To list the size and rows of each table, add up the pages from sys.dm_db_partition_stats and split them into data, index and unused space. This post shows three traps in the common join query and checks the corrected result against sp_spaceused.
MAX Columns Ever Existed in Table – SQL in Sixty Seconds #182
Earlier I wrote about SQL SERVER – MAX Columns ID Used in Table and lots of people asked me to create a video on this topic. Let us see the video.
Free Space in Database Files: Check Data and Log Files
To see the free space in database files, compare each file’s size with the pages it uses. This post gives one query for data and log files, adds the free space on the drive, and checks the log figure against a second source.
SQL SERVER – Rename View
When I rename view objects, I inspect references and retained definitions first. SSMS and sp_rename both need dependency planning.
SQL SERVER – High Frequency Cached Query Counts and Statement Metrics
I measure High Frequency cached statements with decimal executions-per-second arithmetic. A customer wanted to identify the busiest queries.