Schema changes/old

This page contains historical information. It may be outdated or unreliable.

What?

How do you know if you need to request a schema change? If you are changing anything in how the database is setup (columns, tables, column types, etc), you need to use this process.

Guidelines

• All schema changes must be optional for your code; schema changes can take a while to propagate across the entire WMF cluster so your code should not depend on them.
• All schema changes must be reviewed by DB Ops and/or Platform Engineering.
• To get your schema change reviewed, open a ticket in Phabricator with all pertinent information.
• Please create your ticket as soon as possible as it can take time to review and deploy the change, working around other Deployments.
• We use a tracking ticket in Phabricator to list all schema change tickets.

See also

• How to do a schema change
• 2015 proposal: Schema changes/Coordination proposal