Preface: What is an InnoDB log sequence number?
The Log sequence number (LSN) is an important database parameter
used by InnoDB in many places.
The most important use is for crash recovery and buffer pool purge control.
Internally, the InnoDB LSN counter never goes backward.
And, when InnoDB writes 50 bytes to the redo logs, the LSN increases by 50 bytes.
As such we can count LSN in …