1 link tagged with all of: reliability + write ahead log + tom lane + process per connection + postgres
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Snowflake interviews Tom Lane, a core Postgres developer for 25 years, about the architectural decisions that have kept the database stable and reliable. He discusses why the process-per-connection model works, how the write-ahead log handles crash recovery, and the trade-offs the project continues to navigate.
- Postgres uses isolated OS processes per connection instead of threads, which simplifies code and improves crash resistance—if one session crashes, it doesn't corrupt shared state or require a full system restart.
- The write-ahead log (WAL) lets transactions commit as soon as log data hits disk, even though table changes may still sit in shared buffers; this batching approach reduces random disk I/O compared to writing scattered changes immediately.
- Connection pooling tools like PgBouncer solve the overhead problem of managing thousands of connections, though the core project hasn't fully integrated pooling into Postgres itself.
postgres
tom lane
process per connection
write ahead log
reliability