ALLOW_PAGE_LOCKS OFF prevents a rowstore index from being reorganized. A controlled example shows the maintenance error, checks the index setting and verifies that enabling page locks allows REORGANIZE without changing the stored rows.
Raising a Database Compatibility Level Safely
Raise a compatibility level safely by capturing a Query Store baseline, changing one database, comparing plans, and keeping a tested reversal.
Calculating the Cost of a Slow Query
Cost of a slow query includes frequency, CPU, reads, waits, and user time; learn to turn SQL Server measurements into a practical tuning priority.
Resource Governor: Capping a Runaway Report
Capping a runaway report with Resource Governor uses workload groups, pools, and a tested classifier to limit one workload safely.
Columns With No Statistics: Read Each Warning
A columns-with-no-statistics warning needs a column-by-column investigation. Compare warning lists before and after targeted statistics creation, and check the actual query behavior before deciding that a missing statistic caused poor performance.
No Join Predicate: Verify the Relationship Before Tuning
No join predicate prompts a relationship check. Compare all combinations with exact customer-order pairs before changing indexes or hiding duplicates.
Your First Extended Events Session
Build your first Extended Events session for slow SQL calls, choose a bounded ring buffer or file target, and read the captured result.