I discussed the method to change the database and table collation with my client during the Comprehensive Database Performance Health Check.
Slowest Cached Queries in SQL Server: Time, Reads and Plan
To find the slowest cached queries in SQL Server, rank each statement by its average elapsed time and keep its plan beside it. This post builds a small workload, reads sys.dm_exec_query_stats with the plan, and shows why a database filter on the sql text hides every ad hoc query.
sp_updatestats and Disabled Indexes: What Gets Updated
sp_updatestats and disabled indexes: the procedure updates statistics on disabled nonclustered indexes and skips a table whose clustered index is disabled. This post proves both, times the cost of disabled indexes against dropped ones on a million rows, and generates a targeted update that skips them.
Top N Plus Others: Grouping the Rest Into One Row
Create top N plus others summaries with deterministic category ranking, one remainder total, stable labels, and explicit display ordering.
Infinite Loop – SQL in Sixty Seconds #144
Lots of people wrote feedback about it and wanted me to explain in this video so I have built this new Video where I discuss Infinite Loop.
SQL SERVER – Change Database and Table Collation
To Change Database collation, I separate its default from existing character-column settings. The customer moved from case-insensitive to case-sensitive behavior.
WHILE 1 = 1 Loop in T-SQL: Run Forever, Stop Safely
A WHILE 1 = 1 loop never ends on its own, so every one needs a planned exit. This post builds a once-a-second sampler with three ways out, a stop flag, a round limit and a time limit, then shows how to stop a loop from a second window and what the recursion limit does.
Efficiency Trick – Query Shortcut – SQL in Sixty Seconds #143
I have built a new SQL in Sixty Seconds video which describes how Query Shortcut works and how we can change them. Let us learn today.
Default Query Shortcuts in SSMS: Alt+F1, Ctrl+1 and Ctrl+2
The default query shortcuts in SSMS are Alt+F1, Ctrl+1 and Ctrl+2, and each runs a system procedure on the text you select. This post shows what sp_help, sp_who and sp_lock return, why sp_lock has a better replacement, and which keys you can change.
JOIN Elimination in SQL Server: When a Table Drops Out
JOIN elimination removes a joined table from the plan when the query does not need it. This post proves it with STATISTICS IO, then tests nine variations to show when it applies and when it does not, including a foreign key that has lost its trust.