pg_hint_plan14 1.4.2

This Release
pg_hint_plan14 1.4.2
Date
Status
Stable
Abstract
Query hints in SQL comments
Description
This library adds support for query hints in SQL comments in PostgreSQL 14.
Released By
michaelpq
License
BSD
Resources
Special Files
Tags

Extensions

pg_hint_plan 1.4.2
Query hints in SQL comments

Documentation

installation
Installation
uninstallation
Uninstallation
index
pg_hint_plan 1.4
functional_limitations
Functional limitations
errors
Errors
requirements
Requirements
hint_list
Hint list
description
Description
hint_table
The hint table
hint_details
Details in hinting
synopsis
Synopsis

README

Contents

pg_hint_plan 1.4

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:

  1. Description
  2. The hint table
  3. Installation
  4. Unistallation
  5. Details in hinting
  6. Errors
  7. Functional limitations
  8. Requirements
  9. Hints list

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