Kill a stuck backend postgres
Force-kill a backend by pid; note: try pg_cancel_backend first to cancel the query only
SELECT pg_terminate_backend(<pid>); -- graceful first: SELECT pg_cancel_backend(<pid>);
more postgres
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Top queries by total time
SELECT query, calls, total_exec_time, mean_exec_time, rows FROM pg_stat_statements ORDER BY total_exec_time DESC LIMIT 20;
EXPLAIN with buffers
EXPLAIN (ANALYZE, BUFFERS, VERBOSE) SELECT ... ; -- shared hit/read shows cache vs disk I/O
Blocking lock tree
SELECT pid, pg_blocking_pids(pid) AS blocked_by, wait_event_type, query FROM pg_stat_activity WHERE cardinality(pg_blocking_pids(pid)) > 0;
Replication lag bytes
SELECT client_addr, state, pg_wal_lsn_diff(pg_current_wal_lsn(), replay_lsn) AS replay_lag_bytes, write_lag, flush_lag, replay_lag FROM pg_stat_replication;
Biggest databases
SELECT datname, pg_size_pretty(pg_database_size(datname)) AS size FROM pg_database ORDER BY pg_database_size(datname) DESC;