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“Track index usage and storage overhead” addresses the missing index dmv caution situation—a single recommendation ignores write/storage cost. The observed failure is: Existing index begins with a rarely filtered column. Monitor index seek usage and write cost.

“Monitor version-store usage and long transactions” concerns Concurrent updates produce inconsistent intermediate totals; the reported problem instead is Existing index begins with a rarely filtered column. Monitor index seek usage and write cost.

“Monitor Query Store regressed queries” concerns Query Store captures a new high-cost plan; the reported problem instead is Existing index begins with a rarely filtered column. Monitor index seek usage and write cost.

“Collect deadlock XML and lock acquisition order” concerns Deadlock graphs repeatedly identify the same pair of statements; the reported problem instead is Lock waits remain while session is inactive. Inspect blocking_session_id, active transaction DMVs and lock owner.

“Inspect columnstore rowgroup DMVs and ingestion batch pattern” concerns Columnstore contains many small delta rowgroups; the reported problem instead is Lock waits remain while session is inactive. Inspect blocking_session_id, active transaction DMVs and lock owner.

“Inspect wait stats, isolation settings and transaction duration” concerns Readers wait for exclusive locks during updates; the reported problem instead is Lock waits remain while session is inactive. Inspect blocking_session_id, active transaction DMVs and lock owner.

“Apply bounded retry with idempotency after handling conflicts” concerns App treats concurrency conflict as permanent failure; the reported problem instead is Lock waits remain while session is inactive. Fix application transaction lifetime and safely handle the blocker.

“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 Lock waits remain while session is inactive. Fix application transaction lifetime and safely handle the blocker.

“Choose supported snapshot-based isolation consistent with application needs” concerns Concurrent updates produce inconsistent intermediate totals; the reported problem instead is Lock waits remain while session is inactive. Fix application transaction lifetime and safely handle the blocker.

“Benchmark small and large tenant parameter sets in test SQL” concerns The cached query plan favors one selectivity pattern; the reported problem instead is Lock waits remain while session is inactive. Open a test transaction and reproduce blocked update.

“Replay concurrent update/read workload against a sandbox copy” concerns Readers wait for exclusive locks during updates; the reported problem instead is Lock waits remain while session is inactive. Open a test transaction and reproduce blocked update.

“Run simultaneous test writer and reader transactions” concerns Concurrent updates produce inconsistent intermediate totals; the reported problem instead is Lock waits remain while session is inactive. Open a test transaction and reproduce blocked update.

“Compressed rowgroups and scan efficiency improve” concerns Columnstore contains many small delta rowgroups; the reported problem instead is Lock waits remain while session is inactive. Transactions complete without persistent idle blocking.

“Spill events decrease and query remains correct” concerns Actual plan warns of spill and high memory grant; the reported problem instead is Lock waits remain while session is inactive. Transactions complete without persistent idle blocking.

“Invariant preserved and expected one transaction eventually succeeds” concerns App treats concurrency conflict as permanent failure; the reported problem instead is Lock waits remain while session is inactive. Transactions complete without persistent idle blocking.

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

“Monitor version-store usage and long transactions” concerns Concurrent updates produce inconsistent intermediate totals; the reported problem instead is Lock waits remain while session is inactive. Monitor long-running open transactions.

“Monitor index usage and storage overhead” concerns A single recommendation ignores write/storage cost; the reported problem instead is Lock waits remain while session is inactive. Monitor long-running open transactions.

“Inspect isolation and row-version conflict errors” concerns App treats concurrency conflict as permanent failure; the reported problem instead is Columnstore contains many small delta rowgroups. Inspect columnstore rowgroup DMVs and ingestion batch pattern.

“Inspect Query Store plans and parameter distributions” concerns The cached query plan favors one selectivity pattern; the reported problem instead is Columnstore contains many small delta rowgroups. Inspect columnstore rowgroup DMVs and ingestion batch pattern.

“Inspect blocking_session_id, active transaction DMVs and lock owner” concerns Lock waits remain while session is inactive; the reported problem instead is Columnstore contains many small delta rowgroups. Inspect columnstore rowgroup DMVs and ingestion batch pattern.

“Choose supported snapshot-based isolation consistent with application needs” concerns Concurrent updates produce inconsistent intermediate totals; the reported problem instead is Columnstore contains many small delta rowgroups. Improve batching and supported rowgroup maintenance strategy.

“Update appropriate statistics or adjust stats maintenance process” concerns Outdated statistics misestimate filtered cardinality; the reported problem instead is Columnstore contains many small delta rowgroups. Improve batching and supported rowgroup maintenance strategy.

“Use appropriate plan-stability or parameter-sensitivity strategy based on supported engine” concerns The cached query plan favors one selectivity pattern; the reported problem instead is Columnstore contains many small delta rowgroups. Improve batching and supported rowgroup maintenance strategy.

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

“Run simultaneous test writer and reader transactions” concerns Concurrent updates produce inconsistent intermediate totals; the reported problem instead is Columnstore contains many small delta rowgroups. Bulk-load comparable test batches and run aggregates.

“Load skewed fixture and compare query plans before/after stats refresh” concerns Outdated statistics misestimate filtered cardinality; the reported problem instead is Columnstore contains many small delta rowgroups. Bulk-load comparable test batches and run aggregates.

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

“Cardinality estimates and plan selection improve appropriately” concerns Outdated statistics misestimate filtered cardinality; the reported problem instead is Columnstore contains many small delta rowgroups. Compressed rowgroups and scan efficiency improve.

“Spill events decrease and query remains correct” concerns Actual plan warns of spill and high memory grant; the reported problem instead is Columnstore contains many small delta rowgroups. Compressed rowgroups and scan efficiency improve.

“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.