The table data in database is the canonical form. You can delete the transaction logs, and temporarily lose some reliability. It is very common to delete the transaction logs when not needed. When databases are backed up, they either dump the logical data or take snapshot of the data. Then can take stream of transaction logs for syncing or backup until the next checkpoint.
I'm pretty sure journalled filesystem recycle the journal. There are log-structured filesystem but they aren't used much beyond low-level flash.
I'm pretty sure journalled filesystem recycle the journal. There are log-structured filesystem but they aren't used much beyond low-level flash.