Postgresql

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 …

Analyze PostgreSQL Query Times with pg_stat_statements PostgreSQL 13 renamed the timing columns of pg_stat_statements: total_time became total_exec_time, mean_time became mean_exec_time, and the same suffix went onto the minimum, maximum and standard deviation columns. A query copied from an older tutorial fails on a …

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 …

Prioritize PostgreSQL Table Analysis: Unlocking Performance Insights Maintaining optimal PostgreSQL database performance requires regular table analysis. This process lets the query planner make informed decisions based on accurate table statistics. This article dives into a valuable PostgreSQL script revealing tables …

PostgreSQL Performance Boost: Understanding Vacuum, Analyze, and Bloat Maintaining peak PostgreSQL database performance means understanding the crucial processes of vacuuming and analysis. Left unchecked, dead tuples (deleted or updated rows) can lead to table bloat, slowing queries and wasting space. This article …

Mastering PostgreSQL Locks: Troubleshooting and Performance Insights In a busy PostgreSQL database, multiple transactions might try to access the same resources simultaneously. Locks are PostgreSQL's way of handling concurrency, ensuring data consistency and preventing conflicts. This article dives into PostgreSQL lock …

PostgreSQL Lock Troubleshooting: Unlocking Blocked Processes 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 designed to expose blocked …

Find Unused PostgreSQL Indexes Before They Cost You Which indexes have gone unused since the statistics were last reset? pg_stat_all_indexes counts every index scan per index, and an index whose idx_scan is still zero after weeks of normal traffic is a candidate to drop. The query below lists those indexes, largest …

Identifying Unused Indexes in PostgreSQL: Optimizing Storage and Performance In PostgreSQL, indexes act as shortcuts, accelerating data retrieval within tables. However, unused indexes can become a burden, consuming storage space and potentially impacting performance. This article explores a PostgreSQL code snippet …