Make WAL smaller

[MMeent]

First part (WAL record block header improvements) sent¹.

The second part of reducing the main WAL record header from 24B to <16B has been submitted ² and added to to the commitfest too³.

This work is also documented on the PostgreSQL wiki⁴.

Footnotes

1. https://www.postgresql.org/message-id/flat/CAEze2WjuJqVeB6EUZ1z75_ittk54H6Lk7WtwRskEeGtZubr4bQ%40mail.gmail.com ↩

2. https://www.postgresql.org/message-id/flat/CAEze2WgcW5SkPO_TGTqirRcCS_FN0xEZqUsXDE6pPz2TYzXQBA@mail.gmail.com ↩

3. https://commitfest.postgresql.org/43/4386/ ↩

4. https://wiki.postgresql.org/wiki/Updating_the_WAL_infrastructure ↩

[andreasscherbaum]

Current status: Returned with feedback

Decision from alignment meeting: Let's stop this here.