Scattered notes on MariaDB undo log.
Ivan
Undo log Undo log in MariaDB/InnoDB is divided into a set of rollback segments (128) which reside in dedicated tablespaces (data files) (undo0XXX) including historically the one number Zero (0) that resides in the system tablespace starting at page 6 (FSP_FIRST_RSEG_PAGE_NO / fsp0types.h) (at...