SET PARTNER OFF can break mirroring by permanently removing its relationship. I confirm the intended outcome before either command.
Trigger Blocks Index Maintenance: How to Let Rebuilds Pass
A trigger blocks index maintenance when it guards every index event, because a rebuild is an index event too. This post shows the failure, then a trigger that reads EVENTDATA and lets rebuilds through while it still blocks create, drop and disable.
Prevent Unauthorized Index Modifications – SQL in Sixty Seconds #183
Many people asked me to create a video on the same topic, so we have Prevent Unauthorized Index Modifications. Here is the video.
Prevent Index Changes in SQL Server With a DDL Trigger
To prevent index changes in one database, create a DDL trigger on the index events that rolls back the statement and says why. This post tests the trigger, shows what it blocks, and lists the index changes that slip past it.
SQL SERVER – Trigger on Database to Prevent Table Creation
A Trigger on Database scope can reject CREATE_TABLE events. A customer required this rule, though I preferred ordinary permissions.
Index a Computed Column in SQL Server
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.