Database reliabilityBeginner
Audit database migration reliability
Did a release make database migrations less reliable?
Measure migration success, rollback behavior, and duration by application release.
The dataset and query remain in this browser.
Expected result
Migration success rate by release
100%
2026.07.1
50%
2026.07.2
100%
2026.07.3
| release | migration_runs | successful_runs | failed_runs | success_rate_pct | average_duration_ms |
|---|---|---|---|---|---|
| 2026.07.1 | 3 | 3 | 0 | 100 | 1,300 |
| 2026.07.2 | 4 | 2 | 2 | 50 | 1,450 |
| 2026.07.3 | 2 | 2 | 0 | 100 | 1,125 |
How to read the query
- The release reliability rate counts rolled-back operations as unsuccessful.
- Duration trends can reveal increasingly expensive schema changes before they fail.
- The migration identifier remains available for drilling into individual executions.
How to interpret the results
- 1Block promotion when a release contains an unexplained failed or rolled-back migration.
- 2Review long-running migrations for locking and deploy-window risk.
- 3Separate retry success from first-attempt success if your runner emits attempts.
Related lessons
Keep the result
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