postgres=# select * from sessions where video_id = 'EYwh18PBitM';
B-tree build and batching WAL records
Batch or compress WAL records during B-tree construction.
session summary
The group explored reducing WAL volume during B-tree index creation by batching full-page images, which could later let compressors reuse context across similar pages. After tracing the sorted B-tree build and its page-flush routine, they changed it to postpone writes and emit roughly 31 pages in one WAL record. The build and basic tests worked, but compression itself was not implemented, replication coverage was uncertain, and macOS library and overheating problems prevented the intended size and performance comparison.
timecodes
- Patch status and PostgreSQL CI infrastructure
- Why full-page images limit WAL compression
- Reusing compression context across B-tree pages
- Measuring current multi-page WAL records
- Tracing the sorted B-tree build path
- Designing deferred page flushing and batching
- Implementing the multi-page WAL batch
- Successful 31-page records and missing benchmarks