Python, MS SQL, and batch inserts

ericwoodworth at ericwoodworth at
Tue Apr 21 22:08:08 CEST 2009

On Apr 21, 4:01 pm, ericwoodwo... at wrote:
> On Apr 21, 3:36 pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> > Philip Semanchuk wrote:
> > > ... If you're doing a mass insert to populate a blank table it also often
> > > helps to postpone index creation until after the table is populated....
> > I forget the name of the SQL Server bulk loader, but for large loads, I
> > used to populate a fresh table with the bulk data, then do UPDATEs and
> > INSERTs to get the data spread out into the main tables.  You (the OP)
> > might try a scheme like that.
> > --Scott David Daniels
> > Scott.Dani... at Acm.Org
> Hmm..I think I'm going to move my question over to a SQL forum because
> this is starting to feel like a SQL, rather than a python issue to me.
> Three times now after letting the system "rest" where I go off an do
> other things and then run my script it completes in 10 seconds.  If I
> drop tables and start fresh immediately after that it takes 35
> seconds.  If I drop the tables and wait an hour and then run the
> script it'll finish in 10 seconds again.
> That makes me think it's a SQL config or optimization issue more than
> a python issue.
> oh and the times I listed above were totals from the start of
> execution so the string.join() was taking 0.047 seconds to run.  It
> was taking 9 seconds to get my data from the com object and format it
> but the join was quite fast.

Also if I restart SQL it will respond very quickly as well...down to
10 secs again.  Not sure why.

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