On Sat, Mar 30, 2013 at 11:41 AM, Roy Smith <r...@panix.com> wrote: > In article <mailman.3971.1364595940.2939.python-l...@python.org>, > Dennis Lee Bieber <wlfr...@ix.netcom.com> wrote: > >> If using MySQLdb, there isn't all that much difference... MySQLdb is >> still compatible with MySQL v4 (and maybe even v3), and since those >> versions don't have "prepared statements", .executemany() essentially >> turns into something that creates a newline delimited "list" of >> "identical" (but for argument substitution) statements and submits that >> to MySQL. > > Shockingly, that does appear to be the case. I had thought during my > initial testing that I was seeing far greater throughput, but as I got > more into the project and started doing some side-by-side comparisons, > it the differences went away.
How much are you doing per transaction? The two extremes (everything in one transaction, or each line in its own transaction) are probably the worst for performance. See what happens if you pepper the code with 'begin' and 'commit' statements (maybe every thousand or ten thousand rows) to see if performance improves. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
