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rkistner
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Apr 20, 2026
| Replication lag refers specifically to stage 2: the time or volume of changes that have been committed to the source but not yet processed by the PowerSync Service. On Postgres, this is reported as `replication_lag_bytes` (bytes of WAL ahead of the PowerSync replication slot). | ||
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| SQL Server has an additional source of latency inside stage 1: the CDC capture job itself runs on an interval (default 5 seconds on SQL Server, fixed at 20 seconds on Azure SQL), so changes do not appear in the CDC change tables instantly. See [SQL Server](#sql-server) below. |
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Potentially also worth looking at these pending updates (waiting on the next Service release): #392 We don't need to consolidate both PRs necessarily, can still merge 392 later, but just wanted to share in case it affects any of the content here. |
per replicated row, not with query complexity.
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maintenance-ops/replication-lag.mdxwith monitoring, common causes, and remediation stepsproduction-readiness-guide.mdxso the anchor resolves (for url reference)maintenance-ops/monitoring-and-alerting.mdxandmaintenance-ops/production-readiness-guide.mdx