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Matts (1087)

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I work for MessageLabs [] in Toronto, ON, Canada. I write spam filters, MTA software, high performance network software, string matching algorithms, and other cool stuff mostly in Perl and C.

Journal of Matts (1087)

Wednesday March 13, 2002
07:23 AM


[ #3482 ]

DBD::SQLite 0.11 is now on CPAN. This upgrades to SQLite 2.4.0, adding views and a few other niceties. I also had to fix the transaction model because running under mod_perl with Apache::DBI it continuously locked up solid. This was because under AutoCommit=0, I would immediately do a "BEGIN TRAN", which locked the database, and even when I issued a commit, it would do "COMMIT TRAN" followed by another "BEGIN" immediately. So now it only does "BEGIN TRAN" when you actually execte some SQL, and just flags whether I'm in a transaction or not. I believe this is how DBD::Sybase does it too.

I also found a couple of bugs in the core SQLite library, which I mailed the author about and he said he'd fix them in the next release (they're nothing major - just cause compiler warnings).

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  • I wonder what the performance is on huge (over 1 GB) unindexed tables, say using a basic 'select'.

    I also wonder if there are any free vector/text based solutions out there (besides csv/dbm).

    Thanks for the info. I *do* take interest in these posts, in case our Oracle server is taken from us. :(

    • I wonder what the performance is on huge (over 1 GB) unindexed tables, say using a basic 'select'.

      Why don't you find out for me?
      • Damn. I was hoping you already had something set up. :)

        If I get a chance, I'll give it a shot in the next couple of weeks.

        Oh, and in case anyone wants a rough comparison of an RDMS versus a commercial text-based solution (in our case, it was BRS by Dataware Technologies), we had eight databases joined, at roughly 4 GB per database, and I could get about 100,000 results in less than a second. With Oracle, I hit my IO limits on a single unindexed 1GB table before I get results.

        And you only think I'm e

  • Want me to make a PPM available for this? (I have a few already at the OI SF site [].) I just built DBD::SQLite on NT 4.0 with VC++ and all tests passed, superfine. I'm getting ready to run the SPOPS tests using it as well, but I'm sure they'll be ok too.