On 8/9/07, Simon Riggs <simon@2ndquadrant.com> wrote: On Thu, 2007-08-09 at 15:46 +0530, Pavan Deolasee wrote:
>
> What if we just track the amount of potentially dead space in the
> relation
> (somebody had suggested that earlier in the thread) ? Every committed
> UPDATE/DELETE and aborted UPDATE/INSERT would increment
> the dead space. Whenever page fragmentation is repaired, either during
> normal operation or during vacuum, the dead space is reduced by the
> amount of reclaimed space. Autovacuum triggers whenever the percentage
> of dead space increases beyond a threshold.
>
> We can some fine tuning to track the space consumed by redirect-dead
> line pointers.
Sounds great.
So do we have consensus here ? Fortunately, I think there won't be any
changes to user interface. Users can still use the vacuum_scale_factor to
tune autovacuum, but instead of percentage of dead tuples, it would
signify percentage of dead space in the relation.
Thanks,
Pavan
--
Pavan Deolasee
EnterpriseDB
http://www.enterprisedb.com