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“Monitor long-running open transactions” concerns Lock waits remain while session is inactive; the reported problem instead is Columnstore contains many small delta rowgroups. Monitor open and deleted rowgroup ratios.

“Monitor Query Store regressed queries” concerns Query Store captures a new high-cost plan; the reported problem instead is Columnstore contains many small delta rowgroups. Monitor open and deleted rowgroup ratios.

“Monitor index usage and storage overhead” concerns A single recommendation ignores write/storage cost; the reported problem instead is Columnstore contains many small delta rowgroups. Monitor open and deleted rowgroup ratios.

“Inspect isolation and row-version conflict errors” concerns App treats concurrency conflict as permanent failure; the reported problem instead is Actual plan warns of spill and high memory grant. Inspect sort/hash spills and underestimated row counts.

“Inspect Query Store plans and parameter distributions” concerns The cached query plan favors one selectivity pattern; the reported problem instead is Actual plan warns of spill and high memory grant. Inspect sort/hash spills and underestimated row counts.

“Inspect isolation level and observed read anomalies” concerns Concurrent updates produce inconsistent intermediate totals; the reported problem instead is Actual plan warns of spill and high memory grant. Inspect sort/hash spills and underestimated row counts.

“Fix application transaction lifetime and safely handle the blocker” concerns Lock waits remain while session is inactive; the reported problem instead is Actual plan warns of spill and high memory grant. Fix cardinality/index design or query shape before increasing resources.

“Make transactions access resources consistently and retry chosen victims” concerns Deadlock graphs repeatedly identify the same pair of statements; the reported problem instead is Actual plan warns of spill and high memory grant. Fix cardinality/index design or query shape before increasing resources.

“Create or revise composite index key order for dominant filters” concerns Existing index begins with a rarely filtered column; the reported problem instead is Actual plan warns of spill and high memory grant. Fix cardinality/index design or query shape before increasing resources.

“Benchmark lookups before/after on representative dataset” concerns Existing index begins with a rarely filtered column; the reported problem instead is Actual plan warns of spill and high memory grant. Replay representative sort with captured plans.

“Replay concurrent update/read workload against a sandbox copy” concerns Readers wait for exclusive locks during updates; the reported problem instead is Actual plan warns of spill and high memory grant. Replay representative sort with captured plans.

“Replay affected query with prior and candidate plan on snapshot” concerns Query Store captures a new high-cost plan; the reported problem instead is Actual plan warns of spill and high memory grant. Replay representative sort with captured plans.

“Query performance returns without incorrect forced assumptions” concerns Query Store captures a new high-cost plan; the reported problem instead is Actual plan warns of spill and high memory grant. Spill events decrease and query remains correct.

“Deadlocks fall and transaction invariants remain intact” concerns Deadlock graphs repeatedly identify the same pair of statements; the reported problem instead is Actual plan warns of spill and high memory grant. Spill events decrease and query remains correct.

“Both workloads meet latency goals with correct row results” concerns The cached query plan favors one selectivity pattern; the reported problem instead is Actual plan warns of spill and high memory grant. Spill events decrease and query remains correct.

“Monitor plan forcing and parameter regression” concerns The cached query plan favors one selectivity pattern; the reported problem instead is Actual plan warns of spill and high memory grant. Monitor tempdb waits and memory grants.

“Monitor row versioning and tempdb or persistent version-store pressure” concerns Readers wait for exclusive locks during updates; the reported problem instead is Actual plan warns of spill and high memory grant. Monitor tempdb waits and memory grants.

“Monitor Query Store regressed queries” concerns Query Store captures a new high-cost plan; the reported problem instead is Actual plan warns of spill and high memory grant. Monitor tempdb waits and memory grants.

“Inspect isolation level and observed read anomalies” concerns Concurrent updates produce inconsistent intermediate totals; the reported problem instead is App treats concurrency conflict as permanent failure. Inspect isolation and row-version conflict errors.

“Inspect sort/hash spills and underestimated row counts” concerns Actual plan warns of spill and high memory grant; the reported problem instead is App treats concurrency conflict as permanent failure. Inspect isolation and row-version conflict errors.

“Inspect wait stats, isolation settings and transaction duration” concerns Readers wait for exclusive locks during updates; the reported problem instead is App treats concurrency conflict as permanent failure. Inspect isolation and row-version conflict errors.

“Improve batching and supported rowgroup maintenance strategy” concerns Columnstore contains many small delta rowgroups; the reported problem instead is App treats concurrency conflict as permanent failure. Apply bounded retry with idempotency after handling conflicts.

“Make transactions access resources consistently and retry chosen victims” concerns Deadlock graphs repeatedly identify the same pair of statements; the reported problem instead is App treats concurrency conflict as permanent failure. Apply bounded retry with idempotency after handling conflicts.

“Fix cardinality/index design or query shape before increasing resources” concerns Actual plan warns of spill and high memory grant; the reported problem instead is App treats concurrency conflict as permanent failure. Apply bounded retry with idempotency after handling conflicts.

“Run simultaneous test writer and reader transactions” concerns Concurrent updates produce inconsistent intermediate totals; the reported problem instead is App treats concurrency conflict as permanent failure. Run two conflicting sandbox updates with retry policy.

“Bulk-load comparable test batches and run aggregates” concerns Columnstore contains many small delta rowgroups; the reported problem instead is App treats concurrency conflict as permanent failure. Run two conflicting sandbox updates with retry policy.

“Replay concurrent update/read workload against a sandbox copy” concerns Readers wait for exclusive locks during updates; the reported problem instead is App treats concurrency conflict as permanent failure. Run two conflicting sandbox updates with retry policy.

“Compressed rowgroups and scan efficiency improve” concerns Columnstore contains many small delta rowgroups; the reported problem instead is App treats concurrency conflict as permanent failure. Invariant preserved and expected one transaction eventually succeeds.

“Deadlocks fall and transaction invariants remain intact” concerns Deadlock graphs repeatedly identify the same pair of statements; the reported problem instead is App treats concurrency conflict as permanent failure. Invariant preserved and expected one transaction eventually succeeds.

“Spill events decrease and query remains correct” concerns Actual plan warns of spill and high memory grant; the reported problem instead is App treats concurrency conflict as permanent failure. Invariant preserved and expected one transaction eventually succeeds.

“Monitor index usage and storage overhead” concerns A single recommendation ignores write/storage cost; the reported problem instead is App treats concurrency conflict as permanent failure. Monitor retry storms and repeat conflicts.

“Monitor plan forcing and parameter regression” concerns The cached query plan favors one selectivity pattern; the reported problem instead is App treats concurrency conflict as permanent failure. Monitor retry storms and repeat conflicts.

“Monitor Query Store regressed queries” concerns Query Store captures a new high-cost plan; the reported problem instead is App treats concurrency conflict as permanent failure. Monitor retry storms and repeat conflicts.