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Replicas lack true MVCC support

6/10 Medium

PostgreSQL replicas apply WAL updates, making replicas identical copies of the master at any point in time. They don't have true replica MVCC support, preventing queries from reading different versions of data on replicas compared to the primary. This design poses significant constraints for distributed systems.

PostgreSQL
Category
architecture
Workaround
none
Freshness
persistent
Scope
single_lib
Upstream
wontfix
Recurring
Yes
Buyer Type
enterprise

Sources

Collection History

Query: “What are the most common pain points with PostgreSQL for developers in 2025?”3/29/2026

Postgres does not have true replica MVCC support. The fact that replicas apply WAL updates results in them having a copy of on-disk data identical to the master at any given point in time.

Created: 3/29/2026Updated: 3/29/2026