New collector query-stats reads sys.dm_exec_query_stats for the statements
that ran since the previous collection, grouped by query_hash (SQL Server
2008+) or sql_handle + offsets (2005, via legacy ODBC; literals only). Only
the 50 heaviest by CPU, duration, reads and executions, text cut to 4000
characters, no plan XML. The database comes from the plan's dbid attribute,
because ad hoc batches (as Dynamics AX sends) have none in sql_text.
QueryStatsDelta diffs against the previous collection: a statement seen
before with the same plan gets the difference, a plan compiled since then
counts in full, a recompiled or evicted plan or counters that went
backwards start over (never negative), a restart gives no delta. Up to 2000
statements are remembered between collections.
Repository migration 0006: insight.QueryStatSamples (deltas, top 100 per
collection) and insight.QueryTexts (text once per statement), kept for
Retention:RawDays. The text is customer data: never stored as a JSON
snapshot and never part of hub submissions. Window queries for metrics,
waits (raw and hourly), file I/O, blocking, deadlocks, findings active in a
window and top SQL by CPU/duration/reads/executions.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Søren Eggert Lundsteen Olsen
bb3b38e77f