The only scalable delete in Postgres is DROP TABLE
3 days ago
- #Database Performance
- #Postgres
- #Data Management
- The most scalable data deletion methods in PostgreSQL involve dropping entire tables rather than performing large DELETE operations.
- Large DELETE operations don't immediately free up disk space, add write and replication overhead, and generate dead tuples that cause extra work for read queries and autovacuum processes.
- DROP TABLE and TRUNCATE operations are more efficient, as they directly remove files and free space for the OS, producing zero dead tuples and minimal overhead.
- A transactional approach using a temporary table can be effective for one-off deletions of large amounts of data, but requires locking the table.
- For ongoing deletions, partitioning tables (e.g., by date) can transform DELETE operations into DROP TABLE operations, improving scalability and database health.