Thanks. I did have sqlite_unicode => 1, and the db worked with non-ASCII text if I didn't try to compress it.

This seems to fix the problem:
    sub compressor {
        my $in = shift;
        $in = encode ('utf8', $in);
        my $out;
        gzip \$in => \$out;
        return ($out);
    }
    sub uncompressor {
        my $in = shift;
        my $out;
        gunzip \$in => \$out;
        return (decode ('utf8', $out));
    }

[download]


I tested it with some real-life sample data and the compression isn't doing too well: the source data is a 9.4MB text file that compresses down to a 2.4MB zip file. When I imort it without compression, I get a 19.7MB db file. With compression, the db file is 17.0MB. That's a little smaller than the original but not enough to make it worth it. I was hoping for something in the 10MB range (~50% compression). I imagine it could be because each string is compressed separately so repeated strings or parts of strings can't be exploited during compression. Is this a lost battle? If not, I would be grateful for suggestions on a better algorithm.

In reply to Re^4: How do I read from a compressed SQLite FTS4 database with DBD::SQLite? by elef
in thread How do I read from a compressed SQLite FTS4 database with DBD::SQLite? by elef

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