On Wed, Dec 03, 2003 at 01:47:55PM -0600, Smart,Dan wrote: > Is there a reason that the journal needs to be synced more than once per > day? Why is the default set to 100KB?
The default was reasonable for most users. There's no need, really,
to sync more than once a day, but a large journal means a large sync
time/memory use when it does happen.
> Is the goal to get the journal syncing about the same frequency as an expiry
> run is made?
If you're not learning to the journal (ie: it only gets atime updates),
you could just let the journal sync when the expire happens, since the
atime updates are for the expire only.
The goal, however, is just to make sure the DB is up-to-date periodically.
It's more efficient to journal the changes than it is to lock the DB
when updating atimes. Then at some point, the journal gets synced in
one lump.
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