SQL

pg_settings — Query PostgreSQL Configuration Parameters The live configuration PostgreSQL is running with and the values written in postgresql.conf are not always the same. A parameter that requires a server restart has already been updated in the file but the old value is still in effect. A reload that produced a …

Monitor PostgreSQL Active Sessions with pg_stat_activity pg_stat_activity is the system view that shows every backend process running against a PostgreSQL server right now — one row per server process, with the client address, the query it is running, how long it has been running, and what kind of backend it is. A …

Monitor Running Queries in PostgreSQL with pg_stat_activity Where pg_stat_statements aggregates queries that already finished and pgBadger reads logs after the fact, pg_stat_activity is the real-time snapshot: one row per server process, showing what each one is doing at the moment the query runs. It is the right …

Restarting All PostgreSQL Sequences with SQL Script Database administrators often face challenges with PostgreSQL sequences, especially after data has been deleted or when tables have been re-imported. Sequences drive the generation of auto-incrementing values (like primary keys using SERIAL or BIGSERIAL), and …

How to Analyze PostgreSQL Query Cache-Hit Ratio Using pg_stat_statements Purpose Measuring the cache-hit ratio of your PostgreSQL queries is essential for understanding and optimizing how efficiently your database serves data from memory versus disk. This article explains how to use the pg_stat_statements extension to …

PostgreSQL Lock Monitoring: Gain Insights into Locks with Query and Age Purpose This PostgreSQL SQL query equips you to monitor locks held by active database sessions along with their associated queries and age. This detailed information proves invaluable for performance tuning, troubleshooting lock conflicts, and …

PostgreSQL Lock Monitoring: Identify Blocking Locks and Resolve Application Conflicts Purpose In a busy PostgreSQL environment, transactions can sometimes become blocked, waiting for other transactions to release locks. This can slow performance and even cause stalls. This article dissects a powerful PostgreSQL script …

PostgreSQL: Identify Slow Running Queries in Real-Time Purpose This PostgreSQL SQL query provides a real-time snapshot of sessions whose current query (or, for idle sessions, most recent query) started more than 30 seconds ago. It acts as a powerful alternative to a traditional slow query log, helping you proactively …

PostgreSQL Performance Tuning: Analyze Cache Hit Ratio with pg_stat_statements Purpose This PostgreSQL query empowers you to gain critical insights into the efficiency of your query workload by measuring the cache hit ratio from the pg_stat_statements extension. Cache hit ratio is a crucial metric for evaluating how …

Monitor PostgreSQL Recovery Status with pg_is_in_recovery Is this server a standby, and is it still applying WAL? One SELECT answers both questions. It calls pg_is_in_recovery() and the functions that report how far a standby has received and replayed the write-ahead log (WAL), and it adds the two legacy …