pg_hint_plan15

This Release

pg_hint_plan15 1.5.1

Date

2023-10-05

Status

Stable

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 1.5.1: Query hints in SQL comments

Documentation

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

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, which utilizes data statistics, not static rules. The planner (optimizer) esitimates costs of each possible execution plans for a SQL statement then the execution plan with the lowest cost finally be executed. The planner does its best to select the best best execution plan, but is not always perfect, since it doesn't count some properties of the data, for example, 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