pg_hint_plan15

This Release

pg_hint_plan15 1.5.2

Date

2024-08-29

Status

Stable

Other Releases

Abstract

Query hints in SQL comments

Description

This library adds support for query hints in SQL comments in PostgreSQL 15.

Released By

michaelpq

License

BSD

Resources

Special Files

Tags

Extensions

pg_hint_plan 1.5.2: Query hints in SQL comments

Documentation

synopsis: Synopsis
hint_details: Details in hinting
hint_table: The hint table
description: Description
hint_list: Hint list
requirements: requirements
functional_limitations: Functional limitations
errors: Errors
index: pg_hint_plan 1.5
installation: Installation
uninstallation: Uninstallation

README

pg_hint_plan 1.5

pg_hint_plan makes it possible to tweak PostgreSQL execution plans using so-called “hints” in SQL comments, like /*+ SeqScan(a) */.

PostgreSQL uses a cost-based optimizer, that uses data statistics, not static rules. The planner (optimizer) estimates costs of each possible execution plans for a SQL statement, then executes the plan with the lowest cost. The planner does its best to select the best execution plan, but it is far from perfect, since it may not count some data properties, like correlation between columns.

For more details, please see the various documentations available in the docs/ directory:

PGXN

PostgreSQL Extension Network

pg_hint_plan15

Extensions

Documentation

README

Contents

pg_hint_plan 1.5