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https://github.com/supabase/index_advisor
PostgreSQL Index Advisor
https://github.com/supabase/index_advisor
Last synced: about 1 month ago
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PostgreSQL Index Advisor
- Host: GitHub
- URL: https://github.com/supabase/index_advisor
- Owner: supabase
- License: postgresql
- Created: 2023-02-13T20:51:08.000Z (over 1 year ago)
- Default Branch: main
- Last Pushed: 2024-04-12T16:59:05.000Z (7 months ago)
- Last Synced: 2024-04-13T21:54:14.527Z (7 months ago)
- Language: PLpgSQL
- Size: 1.09 MB
- Stars: 3
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# PostgreSQL Index Advisor
A PostgreSQL extension for recommending indexes to improve query performance.
## Features
- Supports generic parameters e.g. `$1`, `$2`
- Supports materialized views
- Identifies tables/columns obfuscaed by views
## API
#### Description
For a given *query*, searches for a set of SQL DDL `create index` statements that improve the query's execution time;
#### Signature
```sql
index_advisor(query text)
returns
table (
startup_cost_before jsonb,
startup_cost_after jsonb,
total_cost_before jsonb,
total_cost_after jsonb,
index_statements text[],
errors text[]
)
```
## Usage
For a minimal example, the `index_advisor` function can be given a single table query with a filter on an unindexed column.
```sql
create extension if not exists index_advisor cascade;
create table book(
id int primary key,
title text not null
);
select
*
from
index_advisor('select book.id from book where title = $1');
```
```markdown
startup_cost_before | startup_cost_after | total_cost_before | total_cost_after | index_statements | errors
---------------------+--------------------+-------------------+------------------+-----------------------------------------------------+--------
0.00 | 1.17 | 25.88 | 6.40 | {"CREATE INDEX ON public.book USING btree (title)"},| {}
(1 row)
```
More complex queries may generate additional suggested indexes
```sql
create extension if not exists index_advisor cascade;
create table author(
id serial primary key,
name text not null
);
create table publisher(
id serial primary key,
name text not null,
corporate_address text
);
create table book(
id serial primary key,
author_id int not null references author(id),
publisher_id int not null references publisher(id),
title text
);
create table review(
id serial primary key,
book_id int references book(id),
body text not null
);
select
*
from
index_advisor('
select
book.id,
book.title,
publisher.name as publisher_name,
author.name as author_name,
review.body review_body
from
book
join publisher
on book.publisher_id = publisher.id
join author
on book.author_id = author.id
join review
on book.id = review.book_id
where
author.id = $1
and publisher.id = $2
');
```
```markdown
startup_cost_before | startup_cost_after | total_cost_before | total_cost_after | index_statements | errors
---------------------+--------------------+-------------------+------------------+-----------------------------------------------------------+--------
27.26 | 12.77 | 68.48 | 42.37 | {"CREATE INDEX ON public.book USING btree (author_id)", | {}
"CREATE INDEX ON public.book USING btree (publisher_id)",
"CREATE INDEX ON public.review USING btree (book_id)"}
(3 rows)
```
## Install
Requires Postgres with [hypopg](https://github.com/HypoPG/hypopg) installed.
```sh
git clone https://github.com/supabase/index_advisor.git
cd index_advisor
sudo make install
```
## Run Tests
```sh
make install; make installcheck
```