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List PostgreSQL Enum Types and Their Values with SQL
Apr 6, 2026 / · 4 min read · postgresql administration schema database data types pg_type pg_enum information_schema pg_namespace ·How to List All Enum Types in a PostgreSQL Database PostgreSQL supports user-defined enum types — a fixed ordered set of string values stored efficiently as integers. Enums are common in application schemas for columns like status, role, or priority. Once created, their allowed values are managed in the database …
Read MoreList Foreign Key Constraints in PostgreSQL
Apr 5, 2026 / · 4 min read · postgresql administration schema database pg_constraint information_schema ·List Foreign Key Constraints in PostgreSQL Foreign key constraints enforce referential integrity between tables. They guarantee that a value in one table's column always has a matching row in another table. Knowing which foreign keys exist — and how they are defined — is essential before dropping tables, renaming …
Read MoreList PostgreSQL Object Comments with SQL
Apr 4, 2026 / · 4 min read · postgresql administration schema database pg_description pg_statio_all_tables information_schema pg_class pg_index pg_namespace pg_proc ·List PostgreSQL Object Comments with SQL PostgreSQL allows you to attach plain-text comments to tables, columns, indexes, functions, and other database objects using the COMMENT ON command. These comments are stored in the system catalog and are visible in psql, pgAdmin, and any tool that reads pg_description. They are …
Read MoreDetect Soft Delete Patterns in PostgreSQL
Apr 3, 2026 / · 5 min read · postgresql database administration performance autovacuum bloat information_schema pg_stat_user_tables ·Detecting Soft Delete Patterns in PostgreSQL Soft deletes are a common application pattern. Instead of removing a row with a DELETE statement, the application marks it as deleted by setting a column — typically deleted_at — to a non-null timestamp. The row stays in the table forever. The application simply filters it …
Read MoreIdentify Insert-Only Tables in PostgreSQL
Apr 2, 2026 / · 5 min read · postgresql database administration performance autovacuum monitoring pg_stat_user_tables pg_stat_bgwriter ·Identify Insert-Only Tables in PostgreSQL Using pg_stat_user_tables Not all PostgreSQL tables behave the same way. Most application tables have a mix of inserts, updates, and deletes. A minority of tables receive only inserts. These append-only tables — event logs, audit trails, sensor readings, message queues — have …
Read MoreGrant SELECT on All Tables in PostgreSQL
Mar 27, 2026 / · 4 min read · postgresql database administration sql queries security access control permissions etl postgres dba pg_default_acl ·Grant SELECT on All Tables in PostgreSQL This PostgreSQL script creates a read-only user and grants SELECT privileges on all existing tables in a schema, plus ensures the same access is automatically applied to any future tables created in that schema. Purpose and Overview Third-party ETL tools, reporting tools, and …
Read MoreKill Idle PostgreSQL Sessions with SQL
Mar 24, 2026 / · 5 min read · postgresql database administration sql queries connection management performance tuning pg_stat_activity postgres dba ·Kill Idle PostgreSQL Sessions with SQL These PostgreSQL scripts terminate idle sessions that have been inactive for more than 15 minutes. Two variants are provided: one that targets idle sessions across all databases on the server, and one scoped to only the currently connected database. Purpose and Overview Idle and …
Read MoreCount PostgreSQL Sessions by State with SQL
Mar 23, 2026 / · 4 min read · postgresql database administration sql queries connection management monitoring pg_stat_activity postgres dba ·Count PostgreSQL Sessions by State This PostgreSQL query returns a count of all server sessions grouped by their current state. It gives a fast at-a-glance view of how connections are distributed across active, idle, and problematic states. Purpose and Overview PostgreSQL tracks the state of every backend connection in …
Read MorePostgreSQL Miscellaneous Settings Query Guide
Mar 22, 2026 / · 5 min read · postgresql database administration sql queries configuration system views pg_settings postgres dba ·PostgreSQL Miscellaneous Settings Query Guide This PostgreSQL query retrieves configuration settings that fall outside all standard category groups — including customized options, process title settings, and any settings added by extensions or custom builds. It works as a catch-all complement to the other …
Read MorePostgreSQL Preset Options Settings Query Guide
Mar 21, 2026 / · 4 min read · postgresql database administration sql queries configuration system views pg_settings postgres dba ·PostgreSQL Preset Options Settings Query Guide This PostgreSQL query retrieves preset option settings from the pg_settings system view. Preset options are read-only, compiled-in values that describe fundamental characteristics of the PostgreSQL installation — they cannot be changed at runtime. Purpose and Overview …
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