On 2019-08-18 16:17, Luca Ferrari wrote: > I'm just curious to better understand the naming convention behind wal > files, because I've seen on a system of mine that the wals created > were: > > 000000050000020E000000FF > 000000050000020F00000000 > > while I was expecting 20E0x100. You are in principle correct. This naming system is a historical accident. The actual LSN associated with the first file is 0000020EFF000000 and so the next one is naturally 0000020F00000000 The reason the zeroes are in there comes from a time when PostgreSQL didn't fully support 64-bit integers, and the LSNs and the files were tracked internally as pairs of 32-bit integers. -- Peter Eisentraut http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
