Optimize Lite query store collector: CTE + 60min window#137
Merged
erikdarlingdata merged 1 commit intodevfrom Feb 19, 2026
Merged
Optimize Lite query store collector: CTE + 60min window#137erikdarlingdata merged 1 commit intodevfrom
erikdarlingdata merged 1 commit intodevfrom
Conversation
Restructure the Query Store collection query to avoid nvarchar(max) query_sql_text in GROUP BY. Aggregation and ranking now happen in a CTE that only touches sys.query_store_query, query_store_plan, and query_store_runtime_stats. The expensive join to sys.query_store_query_text is deferred until after TOP 100 filtering, dramatically reducing sort memory and I/O. Also narrows the lookback window from 24 hours to 60 minutes to match the collection interval and reduce scan volume. Addresses #134. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Summary
sys.query_store_query_textjoin until after TOP 100 filteringnvarchar(max)column from GROUP BY, reducing sort memory and I/ODetails
The original query joined
query_store_query_text(which containsnvarchar(max)query text) before grouping, forcing SQL Server to sort massive text values. The CTE approach:Test plan
dotnet build -c Debug— zero warningsAddresses #134.
🤖 Generated with Claude Code