Speeding up pgstream snapshots for PostgreSQL
10 months ago
- #Performance Optimization
- #PostgreSQL
- #CDC
- pgstream is an open-source CDC tool for PostgreSQL, supporting DDL changes replication, modular deployment, and multiple targets like Postgres, Elasticsearch, and webhooks.
- The snapshot process in pgstream involves capturing and restoring the source schema, reading data, and writing it to the target, initially using pg_dump/pg_restore for schema handling.
- Performance issues were identified in the write path during snapshots, leading to optimizations like using COPY FROM for bulk inserts and deferring index creation.
- Benchmarks showed significant performance improvements, making pgstream snapshots faster than pg_dump/pg_restore for large datasets.
- Future enhancements include automatic batch configuration for consistent memory usage and performance across different table shapes.