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# Verifying Database Capabilities
Sometimes certain bits of code may only work on a certain database and/or
version. While we try to avoid such code as much as possible sometimes it is
necessary to add database (version) specific behaviour.
To facilitate this we have the following methods that you can use:
* `Gitlab::Database.postgresql?`: returns `true` if PostgreSQL is being used
* `Gitlab::Database.mysql?`: returns `true` if MySQL is being used
* `Gitlab::Database.version`: returns the PostgreSQL version number as a string
in the format `X.Y.Z`. This method does not work for MySQL
This allows you to write code such as:
```ruby
if Gitlab::Database.postgresql?
if Gitlab::Database.version.to_f >= 9.6
run_really_fast_query
else
run_fast_query
end
else
run_query
end
```
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