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---
stage: Enablement
group: Sharding
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
---
# Multiple Databases
In order to scale GitLab, the GitLab application database
will be [decomposed into multiple
databases](https://gitlab.com/groups/gitlab-org/-/epics/6168).
## CI Database
Support for configuring the GitLab Rails application to use a distinct
database for CI tables was added in [GitLab
14.1](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/64289). This
feature is still under development, and is not ready for production use.
By default, GitLab is configured to use only one main database. To
opt-in to use a main database, and CI database, modify the
`config/database.yml` file to have a `main` and a `ci` database
configurations. For example, given a `config/database.yml` like below:
```yaml
development:
adapter: postgresql
encoding: unicode
database: gitlabhq_development
host: /path/to/gdk/postgresql
pool: 10
prepared_statements: false
variables:
statement_timeout: 120s
test: &test
adapter: postgresql
encoding: unicode
database: gitlabhq_test
host: /path/to/gdk/postgresql
pool: 10
prepared_statements: false
variables:
statement_timeout: 120s
```
Edit the `config/database.yml` to look like this:
```yaml
development:
main:
adapter: postgresql
encoding: unicode
database: gitlabhq_development
host: /path/to/gdk/postgresql
pool: 10
prepared_statements: false
variables:
statement_timeout: 120s
ci:
adapter: postgresql
encoding: unicode
database: gitlabhq_development_ci
migrations_paths: db/ci_migrate
host: /path/to/gdk/postgresql
pool: 10
prepared_statements: false
variables:
statement_timeout: 120s
test: &test
main:
adapter: postgresql
encoding: unicode
database: gitlabhq_test
host: /path/to/gdk/postgresql
pool: 10
prepared_statements: false
variables:
statement_timeout: 120s
ci:
adapter: postgresql
encoding: unicode
database: gitlabhq_test_ci
migrations_paths: db/ci_migrate
host: /path/to/gdk/postgresql
pool: 10
prepared_statements: false
variables:
statement_timeout: 120s
```
### Migrations
Any migrations that affect `Ci::BaseModel` models
and their tables must be placed in two directories for now:
- `db/migrate`
- `db/ci_migrate`
We aim to keep the schema for both tables the same across both databases.
|
