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---
stage: none
group: unassigned
info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
---
# Managing PostgreSQL extensions **(FREE SELF)**
This guide documents how to manage PostgreSQL extensions for installations with an external
PostgreSQL database.
The following extensions must be loaded into the GitLab database:
| Extension | Minimum GitLab version |
|--------------|------------------------|
| `pg_trgm` | 8.6 |
| `btree_gist` | 13.1 |
| `plpgsql` | 11.7 |
In order to install extensions, PostgreSQL requires the user to have superuser privileges.
Typically, the GitLab database user is not a superuser. Therefore, regular database migrations
cannot be used in installing extensions and instead, extensions have to be installed manually
prior to upgrading GitLab to a newer version.
## Installing PostgreSQL extensions manually
In order to install a PostgreSQL extension, this procedure should be followed:
1. Connect to the GitLab PostgreSQL database using a superuser, for example:
```shell
sudo gitlab-psql -d gitlabhq_production
```
1. Install the extension (`btree_gist` in this example) using [`CREATE EXTENSION`](https://www.postgresql.org/docs/11/sql-createextension.html):
```sql
CREATE EXTENSION IF NOT EXISTS btree_gist
```
1. Verify installed extensions:
```shell
gitlabhq_production=# \dx
List of installed extensions
Name | Version | Schema | Description
------------+---------+------------+-------------------------------------------------------------------
btree_gist | 1.5 | public | support for indexing common datatypes in GiST
pg_trgm | 1.4 | public | text similarity measurement and index searching based on trigrams
plpgsql | 1.0 | pg_catalog | PL/pgSQL procedural language
(3 rows)
```
On some systems you may need to install an additional package (for example,
`postgresql-contrib`) for certain extensions to become available.
## A typical migration failure scenario
The following is an example of a situation when the extension hasn't been installed before running migrations.
In this scenario, the database migration fails to create the extension `btree_gist` because of insufficient
privileges.
```shell
== 20200515152649 EnableBtreeGistExtension: migrating =========================
-- execute("CREATE EXTENSION IF NOT EXISTS btree_gist")
GitLab requires the PostgreSQL extension 'btree_gist' installed in database 'gitlabhq_production', but
the database user is not allowed to install the extension.
You can either install the extension manually using a database superuser:
CREATE EXTENSION IF NOT EXISTS btree_gist
Or, you can solve this by logging in to the GitLab database (gitlabhq_production) using a superuser and running:
ALTER regular WITH SUPERUSER
This query will grant the user superuser permissions, ensuring any database extensions
can be installed through migrations.
```
In order to recover from this situation, the extension needs to be installed manually using a superuser, and
the database migration (or GitLab upgrade) can be retried afterwards.
|
