Hmm... Maybe it is creating the journal but not really using it with synchronous=off.
You might try pragma journal_mode = off. That might keep it from creating a journal, but if you already tried using synchronous=off, my guess is journal_mode=off won't run any faster. Jim On 3/18/09, Nikolas Stevenson-Molnar <steve...@evergreen.edu> wrote: > I've actually been running it with synchronous=off. Unfortunately, it > doesn't seem to run any faster and still creates a journal file. > > _Nik > > On Mar 17, 2009, at 6:05 PM, Jim Wilcoxson wrote: > >> Drop is executed within a transaction, which means that every record >> you touch has to be backed up to the journal first, then modified in >> the database. I'm guessing that if you use pragma synchronous=off, it >> would speed up the drop index, but you'd take a chance on corrupting >> the database if the machine crashed during the drop. >> >> It would probably be faster to make a copy of the database (all >> sequential I/O), then drop the index with synchronous=off in one of >> the copies (no journal I/O), then use vacuum if you want to really >> clean up the DB. If something goes wrong, you still have your backup >> copy. >> >> I haven't actually tried this; let us know if it makes a big >> difference. >> >> Jim >> >> On 3/17/09, Nikolas Stevenson-Molnar <steve...@evergreen.edu> wrote: >>> Hi, >>> >>> I'm trying to drop an index on a table with about 8 million rows and >>> it's taking a very long time. I can understand why building the index >>> would take some time, but why dropping it? And is there any way to >>> speed it up? >>> >>> Thanks! >>> _Nik >>> _______________________________________________ >>> sqlite-users mailing list >>> sqlite-users@sqlite.org >>> http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users >>> >> >> >> -- >> Software first. Software lasts! >> _______________________________________________ >> sqlite-users mailing list >> sqlite-users@sqlite.org >> http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > > _______________________________________________ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > -- Software first. Software lasts! _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
