Data Monitoring
MySQL: Threads running versus connected
MySQL has many connections but only a few statements executing. Compare Threads_connected and Threads_running with application pool waits.
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Data Monitoring
MySQL: Performance Schema instrumentation
A diagnostic table is empty although the workload is active. Check instruments, consumers and retained history capacity for the required event type.
Read article : MySQL: Performance Schema instrumentationData Monitoring
MySQL: Statement digest ranking
A query with low average time dominates total database work. Compare digest execution counts, total latency and per-call latency.
Read article : MySQL: Statement digest rankingData Monitoring
MySQL: Slow query log thresholds
Users report timeouts but the configured slow log captures little. Compare logging thresholds, statement duration and whether the relevant workload qualifies for collection.
Read article : MySQL: Slow query log thresholdsData Monitoring
MySQL: InnoDB row lock waits
Updates queue behind a transaction that appears unrelated. Inspect lock wait relationships and transaction context using supported Performance Schema tables.
Read article : MySQL: InnoDB row lock waitsData Monitoring
MySQL: Metadata lock waits
A schema change hangs behind an application transaction. Compare metadata lock evidence, active DDL and long transactions referencing the object.
Read article : MySQL: Metadata lock waitsData Monitoring
MySQL: Deadlock trend interpretation
Deadlock retries succeed but transaction latency grows. Compare deadlock evidence, retry count and end-to-end application duration.
Read article : MySQL: Deadlock trend interpretationData Monitoring
MySQL: Replica receiver versus applier
A replica receives changes but fails to apply them. Inspect replica status and worker errors, distinguishing retrieval progress from execution progress.
Read article : MySQL: Replica receiver versus applierData Monitoring
MySQL: Seconds behind source limitations
A lag indicator is zero while the business still sees stale replica data. Compare receiver state, applied positions and a known source transaction watermark.
Read article : MySQL: Seconds behind source limitationsData Monitoring
MySQL: Replication worker bottlenecks
One replica worker holds back overall progress. Inspect per-worker application evidence and transaction distribution.
Read article : MySQL: Replication worker bottlenecksData Monitoring
MySQL: Binary log retention headroom
A disconnected replica risks losing required source history. Compare its recovery position with source binary log retention and expected outage duration.
Read article : MySQL: Binary log retention headroomData Monitoring
MySQL: Buffer pool read behavior
A database slowdown is blamed on cache size without workload context. Compare interval buffer pool reads, logical requests and storage latency.
Read article : MySQL: Buffer pool read behaviorStart with the foundations
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