Use CREATE INDEX CONCURRENTLY with a failure and cleanup plan
Concurrent index creation performs multiple table scans and waits for transactions so writes can continue, but it takes longer and can leave an invalid index after failure.
Run pg_dump in production with consistency, load, and restore proof
Pg_dump takes a consistent database snapshot without blocking ordinary readers and writers, but it adds read load and does not include cluster-wide roles or physical recovery state.
Read pg_stat_activity without confusing idle sessions with blockers
Pg_stat_activity exposes one row per server process with transaction, query, wait, and client state; state and wait_event must be interpreted together.
Use pg_stat_statements to rank cumulative PostgreSQL query cost
Pg_stat_statements groups normalized statements and accumulates planning and execution statistics; totals reflect the collection window, not one trace.
Run PostgreSQL ANALYZE when estimates are wrong, not as a ritual
ANALYZE samples table data and updates planner statistics; column distribution, correlation, and statistics targets shape estimates without changing query semantics.
pg_cancel_backend vs pg_terminate_backend: choose the smaller interruption
Pg_cancel_backend requests cancellation of the current query while preserving the session; pg_terminate_backend ends the session and rolls back its open transaction.
Choose PostgreSQL sslmode without disabling identity verification
Sslmode controls whether libpq attempts encryption and whether it validates the server certificate chain and hostname; require does not provide the same identity check as verify-full.
Run EXPLAIN ANALYZE in production without surprising writes or load
EXPLAIN shows the planner estimate, while ANALYZE executes the statement and records actual timing and row counts; executing a write statement still writes unless contained and rolled back.
Build a PostgreSQL lock tree from blockers to waiting sessions
Pg_locks shows held and awaited lockable objects while pg_blocking_pids connects a waiting backend to direct blockers, including parallel-query relationships.
Monitor PostgreSQL replication slots before WAL fills the disk
A replication slot retains WAL or row-change information until its consumer confirms progress; inactive or lagging slots can therefore pin storage indefinitely.
PostgreSQL autovacuum not keeping up: measure dead tuples and age
The search intent behind this problem is preventing bloat and transaction-ID risk without aggressive guessing.
PostgreSQL backup restore test: prove recovery, not file creation
The search intent behind this problem is validating logical or physical backups end to end.
PostgreSQL checkpoint latency spikes: WAL and storage diagnosis
The search intent behind this problem is correlating write bursts with checkpoint behavior.
PostgreSQL connection pool sizing without folklore
The search intent behind this problem is balancing concurrency against memory and contention.
PostgreSQL deadlock detected: read the graph, not the victim
When finding the conflicting transaction order, speed comes from ordering the investigation—not from typing more commands.
PostgreSQL idle in transaction: why it blocks cleanup
The search intent behind this problem is locating sessions holding snapshots and locks.
PostgreSQL index not used: statistics, casts, and selectivity
The search intent behind this problem is explaining why the planner chooses another path.
PostgreSQL lock timeout: fail predictably during deploys
The search intent behind this problem is preventing migrations from waiting indefinitely.
PostgreSQL major upgrade checklist for low-risk production
The search intent behind this problem is inventorying compatibility, extensions, space, and rollback.
PgBouncer session vs transaction pooling: compatibility tradeoffs
When choosing pooling behavior without breaking session state, speed comes from ordering the investigation—not from typing more commands.
PostgreSQL query suddenly slow: plan change, locks, or cache?
The search intent behind this problem is comparing the current execution with workload and wait state.
PostgreSQL read replica returns stale data: define the consistency need
The search intent behind this problem is measuring replay position before changing application routing.
PostgreSQL replication lag: bytes, time, replay, or workload?
The search intent behind this problem is identifying where primary-to-replica progress stalls.
PostgreSQL sequential scan: when it is correct and when it hurts
When deciding whether an index would reduce total work, speed comes from ordering the investigation—not from typing more commands.