On Thu, Dec 10, 2009 at 8:12 PM, Marius Gedminas <mar...@gedmin.as> wrote:
> On Thu, Dec 10, 2009 at 02:07:06PM -0500, Jim Fulton wrote: > > On Thu, Dec 10, 2009 at 1:50 PM, Marius Gedminas <mar...@gedmin.as> > wrote: > > > On Thu, Dec 10, 2009 at 12:41:11PM -0500, Jim Fulton wrote: > > >> On Thu, Dec 10, 2009 at 11:54 AM, Marius Gedminas <mar...@gedmin.as> > wrote: > > >> In 3.9 for FileStorage, if you give a starting tid that is toward the > > >> end of the file, > > >> it will scan backward, saving a lot of time. > > > > > > Ah, but how can I get a valid tid that is toward the end of the file? > > > I assume that if I give a tid that doesn't exist, I'll get an error -- > > > which is the behavior oldstate() exhibits -- rather than the next > > > existing transaction after that timestamp, or I could fudge by getting > > > the current timestamp and subtracting 24 hours. > > > > No, the iterator starts at the first transactions who's tid is >= the > > start tid. > > > > So, guess a time and use repr(ZODB.TimeStamp.TimeStamp(...)) > > Cool! Thank you, > > Marius Gedminas > -- > > another way is to use the fstools.prev_txn starting at the end of the file to grab the newest transactions, the script i send to the list last week uses it to poke a large zodb to just get the contents of the last 20 transactions without iterating through the whole thing or guessing a timestamp. https://mail.zope.org/pipermail/zodb-dev/attachments/20091207/531fc1e4/attachment.obj cheers, kapil
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