Decomposing the GitLab backend database, Part 2: Final migration and results

Part 2 of the series on decomposing the GitLab backend database delves into the migration process and its outcomes, detailing the decision to opt for a full downtime approach over a zero downtime one due to the lack of an easy rollback strategy and negligible business requirements for zero downtime. The migration involved pausing GitLab services and blocking user-level traffic to allow for comprehensive testing, resulting in a successful migration completed in 93 minutes. The team conducted several rehearsals in a staging environment to identify and resolve potential issues, which proved critical to the migration's success. Post-migration performance improvements included reduced CPU utilization and vacuuming saturation, increased headroom, and decreased query duration, leading to enhanced database efficiency. The team's meticulous preparation, including a production readiness review, ensured a smooth transition and provided confidence in tackling potential challenges.

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