Pg_index on Postgres Scripts

List PostgreSQL Object Comments with SQL

Sat, 04 Apr 2026 00:00:00 +0000

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 one of the most underused features for keeping a schema self-documenting.

This SQL query lists comments on every column across all tables in your database, showing the schema, table name, column name, and the comment text. It is useful for auditing schema documentation, onboarding new team members, and verifying that comments are in place before a schema handover.

Find PostgreSQL Index Bloat and Wasted Space

Tue, 31 Mar 2026 00:00:00 +0000

How to Find Index Bloat and Wasted Space in PostgreSQL

Just like tables, PostgreSQL indexes can become bloated over time. When rows are updated or deleted, the old index entries are not removed immediately. They stay in the index as dead entries, wasting space and slowing down index scans.

B-tree indexes are the most common type in PostgreSQL and the most prone to bloat. This query estimates how much space is wasted in each B-tree index, so you can decide which ones need to be rebuilt.

Identify Large PostgreSQL Indexes for Optimization

Sun, 17 Mar 2024 00:00:00 +0000

Unveiling Your PostgreSQL Indexes: A Deep Dive with Code

In the realm of relational databases, efficient data retrieval is paramount. PostgreSQL achieves this partly through the magic of indexes. But have you ever wondered what lurks beneath the surface of these indexes? This post delves into a powerful Postgres Database code snippet that empowers you to unlock the secrets hidden within your indexes.

Sample Code

 1SELECT n.nspname AS schemaname,
 2 c.relname AS tablename,
 3 i.relname AS indexname,
 4 t.spcname AS tablespace,
 5 pg_get_indexdef(i.oid) AS indexdef,
 6 pg_size_pretty(pg_total_relation_size(i.oid)) AS index_size
 7FROM pg_index x
 8 JOIN pg_class c ON c.oid = x.indrelid
 9 JOIN pg_class i ON i.oid = x.indexrelid
10 LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
11 LEFT JOIN pg_tablespace t ON t.oid = i.reltablespace
12WHERE (c.relkind = ANY (ARRAY['r'::"char", 'm'::"char", 'p'::"char"]))
13 AND (i.relkind = ANY (ARRAY['i'::"char", 'I'::"char"]))
14 order by index_size asc;