September 18, 2025 at 7:37 am
Statistics Collection Interval: Defines the level of granularity for the collected runtime statistic, expressed in minutes. The default is 60 minutes. Consider using a lower value if you require finer granularity or less time to detect and mitigate issues. Keep in mind that the value directly affects the size of Query Store data. Use SQL Server Management Studio or Transact-SQL to set a different value for Statistics Collection Interval:
does this mean that query store would run after 60 seconds ,please explain?
Stale Query Threshold (Days): Time-based cleanup policy that controls the retention period of persisted runtime statistics and inactive queries, expressed in days. By default, Query Store is configured to keep the data for 30 days, which might be unnecessarily long for your scenario.
Avoid keeping historical data that you don't plan to use. This practice reduces changes to read-only status.
Q2) if 30 days are not expired and 1000 mb size has not reached, does it change the read only status , question is when this state query threshold is going to change the status to read only.
is this sate query is any way related to Size Based Cleanup Mode?
if QUERY_CAPTURE_MODE = CUSTOM: is set with
STALE_CAPTURE_POLICY_THRESHOLD = 1 hour with
EXECUTION_COUNT=30
that meas if a query executes 30 times in an hour then only it will be sotred.
my question is if a query is not stored as it executed 29 time only. then will get the benefit of "Quickly find and fix a plan performance regression by forcing the previous query plan. Fix queries that have recently regressed in performance due to execution plan changes."
q2) an other dbout i have is above quote unquote ,means it does it automaticlay or we have to check the regression tab to force a plan?
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