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diff --git a/doc/administration/troubleshooting/postgresql.md b/doc/administration/troubleshooting/postgresql.md index f8cb45dd00d..e4d1696ea93 100644 --- a/doc/administration/troubleshooting/postgresql.md +++ b/doc/administration/troubleshooting/postgresql.md @@ -179,3 +179,43 @@ Once saved, [reconfigure GitLab](../restart_gitlab.md#omnibus-gitlab-reconfigure NOTE: These are Omnibus GitLab settings. If an external database, such as a customer's PostgreSQL installation or Amazon RDS is being used, these values don't get set, and would have to be set externally. + +### Temporarily changing the statement timeout + +WARNING: +The following advice does not apply in case +[PgBouncer](../postgresql/pgbouncer.md) is enabled, +because the changed timeout might affect more transactions than intended. + +In some situations, it may be desirable to set a different statement timeout +without having to [reconfigure GitLab](../restart_gitlab.md#omnibus-gitlab-reconfigure), +which in this case would restart Puma and Sidekiq. + +For example, a backup may fail with the following errors in the output of the +[backup command](../../raketasks/backup_restore.md#back-up-gitlab) +because the statement timeout was too short: + +```plaintext +pg_dump: error: Error message from server: server closed the connection unexpectedly +``` + +You may also see errors in the [PostgreSQL logs](../logs.md#postgresql-logs): + +```plaintext +canceling statement due to statement timeout +``` + +To temporarily change the statement timeout: + +1. Open `/var/opt/gitlab/gitlab-rails/etc/database.yml` in an editor +1. Set the value of `statement_timeout` to `0`, which sets an unlimited statement timeout. +1. [Confirm in a new Rails console session](../operations/rails_console.md#using-the-rails-runner) + that this value is used: + + ```shell + sudo gitlab-rails runner "ActiveRecord::Base.connection_config[:variables]" + ``` + +1. Perform the action for which you need a different timeout + (for example the backup or the Rails command). +1. Revert the edit in `/var/opt/gitlab/gitlab-rails/etc/database.yml`. |