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“Monitor Query Store regressed queries” concerns Query Store captures a new high-cost plan; the reported problem instead is Readers wait for exclusive locks during updates. Monitor row versioning and tempdb or persistent version-store pressure.

“Monitor version-store usage and long transactions” concerns Concurrent updates produce inconsistent intermediate totals; the reported problem instead is Readers wait for exclusive locks during updates. Monitor row versioning and tempdb or persistent version-store pressure.

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

“Inspect index key order and WHERE/JOIN predicate patterns” concerns Existing index begins with a rarely filtered column; the reported problem instead is Deadlock graphs repeatedly identify the same pair of statements. Collect deadlock XML and lock acquisition order.

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

“Inspect sort/hash spills and underestimated row counts” concerns Actual plan warns of spill and high memory grant; the reported problem instead is Deadlock graphs repeatedly identify the same pair of statements. Collect deadlock XML and lock acquisition order.

“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 Deadlock graphs repeatedly identify the same pair of statements. Make transactions access resources consistently and retry chosen victims.

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

“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 Deadlock graphs repeatedly identify the same pair of statements. Make transactions access resources consistently and retry chosen victims.

“Run two conflicting sandbox updates with retry policy” concerns App treats concurrency conflict as permanent failure; the reported problem instead is Deadlock graphs repeatedly identify the same pair of statements. Run synchronized concurrent transfers using dummy accounts.

“Run simultaneous test writer and reader transactions” concerns Concurrent updates produce inconsistent intermediate totals; the reported problem instead is Deadlock graphs repeatedly identify the same pair of statements. Run synchronized concurrent transfers using dummy accounts.

“Replay concurrent update/read workload against a sandbox copy” concerns Readers wait for exclusive locks during updates; the reported problem instead is Deadlock graphs repeatedly identify the same pair of statements. Run synchronized concurrent transfers using dummy accounts.

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

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

“Both workloads meet latency goals with correct row results” concerns The cached query plan favors one selectivity pattern; the reported problem instead is Deadlock graphs repeatedly identify the same pair of statements. Deadlocks fall and transaction invariants remain intact.

“Monitor tempdb waits and memory grants” concerns Actual plan warns of spill and high memory grant; the reported problem instead is Deadlock graphs repeatedly identify the same pair of statements. Monitor deadlock rate and transaction retries.

“Monitor plan forcing and parameter regression” concerns The cached query plan favors one selectivity pattern; the reported problem instead is Deadlock graphs repeatedly identify the same pair of statements. Monitor deadlock rate and transaction retries.

“Monitor index usage and storage overhead” concerns A single recommendation ignores write/storage cost; the reported problem instead is Deadlock graphs repeatedly identify the same pair of statements. Monitor deadlock rate and transaction retries.

“Inspect actual plans, existing overlapping indexes and workloads” concerns A single recommendation ignores write/storage cost; the reported problem instead is The cached query plan favors one selectivity pattern. Inspect Query Store plans and parameter distributions.

“Compare plans, duration and deployment timestamp” concerns Query Store captures a new high-cost plan; the reported problem instead is The cached query plan favors one selectivity pattern. Inspect Query Store plans and parameter distributions.

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

“Choose supported snapshot-based isolation consistent with application needs” concerns Concurrent updates produce inconsistent intermediate totals; the reported problem instead is The cached query plan favors one selectivity pattern. Use appropriate plan-stability or parameter-sensitivity strategy based on supported engine.

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

“Correct indexing/statistics or use an approved plan correction mechanism” concerns Query Store captures a new high-cost plan; the reported problem instead is The cached query plan favors one selectivity pattern. Use appropriate plan-stability or parameter-sensitivity strategy based on supported engine.

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

“Benchmark lookups before/after on representative dataset” concerns Existing index begins with a rarely filtered column; the reported problem instead is The cached query plan favors one selectivity pattern. Benchmark small and large tenant parameter sets in test SQL.

“Benchmark candidate and baseline indexes under mixed reads/writes” concerns A single recommendation ignores write/storage cost; the reported problem instead is The cached query plan favors one selectivity pattern. Benchmark small and large tenant parameter sets in test SQL.

“Query performance returns without incorrect forced assumptions” concerns Query Store captures a new high-cost plan; the reported problem instead is The cached query plan favors one selectivity pattern. Both workloads meet latency goals with correct row results.

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

“Read latency improves without lost-update application logic” concerns Readers wait for exclusive locks during updates; the reported problem instead is The cached query plan favors one selectivity pattern. Both workloads meet latency goals with correct row results.

“Monitor deadlock rate and transaction retries” concerns Deadlock graphs repeatedly identify the same pair of statements; the reported problem instead is The cached query plan favors one selectivity pattern. Monitor plan forcing and parameter regression.

“Monitor Query Store regressed queries” concerns Query Store captures a new high-cost plan; the reported problem instead is The cached query plan favors one selectivity pattern. Monitor plan forcing and parameter regression.

“Monitor stats modification counts and plan churn” concerns Outdated statistics misestimate filtered cardinality; the reported problem instead is The cached query plan favors one selectivity pattern. Monitor plan forcing and parameter regression.