If you're doing a huge SELECT or batched INSERT/UPDATEs, the operation may be more efficient -- but the transactions will be longer, which means you will create issues with other connections. unless you grab exclusive locks on tables, you also run a higher risk of integrity errors.
In my experience, if the DB is in active use, you'll be better off with the shortest transactions possible. I'm a big fan of loading things in parallel instead of serial, but I do that for display -- not to select data for a long write operation. -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at http://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
