Thanks Guys On Tue, Jan 26, 2010 at 4:15 PM, Markus Jelsma <[email protected]> wrote:
> Hello Paul and others, > > > Now we're on the subject of compaction, let me ask an question. I have > some importer somewhere that fills a clean db with about 3500 records, > futon now tells me its size is 4.2 MB. However, if i compact a fresh and > clean database (presumably without extraneous information such as old > revisions) it is suddenly just 2.4 MB! > > Can you, or someone, give an explanation on this matter? It smells like an > unwanted feature but i could be wrong :) > > To get things straight, this doesn't happen with just a two documents with > only a uuid ID and a revision number. > > > Cheers, > > > Paul Davis said: > > On Tue, Jan 26, 2010 at 4:56 PM, Sean Clark Hess <[email protected]> > > wrote: > >> I'm wondering if old versions of documents ever expire. On servers > >> that are disk-bound (like my tiny VPS slices will be) this could be > >> something I had to design around. > >> > >> For example, when importing data (millions of rows) from a relational > >> database, I want to be able to build a document a piece at a time. The > >> relational schema is wacked - it has information about a given > >> document in like 10 different tables, and I don't want to have to try > >> to hold everything in memory just so I only have to write the document > >> once. > >> > >> Any way to control it, or turn versioning off? Is it even a concern? > >> Thanks! > >> > > > > Sean, > > > > Compaction removes the bodies of old documents. The only information > > that remains is some historical information to allow for proper > > merging during replication. The number of historical descriptions is > > configurable so that even this information can be pruned during > > compaction. > > > > The closest you could get to purging all historical information is to > > set the rev_stemming parameter low and compacting to get rid of the > > extra data. I personally wouldn't worry too much about the > > rev_stemming parameter and instead just compact as much as needed > > during the import. > > > > HTH, > > Paul Davis > > > >
