https://github.com/ossc-db/pg_hint_plan

Extension adding support for optimizer hints in PostgreSQL
https://github.com/ossc-db/pg_hint_plan

Last synced: 3 months ago
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Extension adding support for optimizer hints in PostgreSQL

• Host: GitHub
• URL: https://github.com/ossc-db/pg_hint_plan
• Owner: ossc-db
• License: other
• Created: 2016-05-13T06:29:45.000Z (over 8 years ago)
• Default Branch: master
• Last Pushed: 2024-08-29T03:33:37.000Z (4 months ago)
• Last Synced: 2024-08-29T04:28:33.714Z (4 months ago)
• Language: C
• Homepage:
• Size: 2.4 MB
• Stars: 686
• Watchers: 30
• Forks: 102
• Open Issues: 4
• Metadata Files:
  • Readme: README.md

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README

        
# pg\_hint\_plan 1.8

`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:

1. [Description](docs/description.md)

1. [The hint table](docs/hint_table.md)

1. [Installation](docs/installation.md)

1. [Uninstallation](docs/uninstallation.md)

1. [Details in hinting](docs/hint_details.md)

1. [Errors](docs/errors.md)

1. [Functional limitations](docs/functional_limitations.md)

1. [Requirements](docs/requirements.md)

1. [Hints list](docs/hint_list.md)

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