Use APPROX_PERCENTILE_CONT for large response-time summaries, compare exact percentiles, and interpret the documented rank error bound.
Finding Schedule Clashes: Overlapping Sessions per Attendee
An attendee says two sessions run at the same time. Here is how to find every overlapping pair once, and why touching is not a clash.
Finding Queries That Spill With total_spills in Query Stats
Rank total_spills and recent counters, inspect plans, compare Query Store tempdb use, and investigate estimates before increasing grants.
Agent Job Step Retries: Retry Attempts and Retry Interval
Configure Agent retry attempts and minute intervals, inspect retry history, and distinguish transient failures from unsafe replays.
Session State in SQL Server With Memory-Optimized Tables
Store transient session state in memory-optimized SQL Server tables with native reads and writes, expiry checks, and clear durability rules.
Checking Constraints After a Bulk Load With DBCC CHECKCONSTRAINTS
Run DBCC CHECKCONSTRAINTS after a controlled bulk-load bypass, inspect violations, and restore enabled trusted CHECK and foreign-key rules.
Prepared Statements and Plan Reuse From Application Code
Inspect prepared statements, handle lifetimes, parameter types, cached Prepared plans, and the limits of optimize for ad hoc workloads.