Re^5: How do I read from a compressed SQLite FTS4 database with DBD::SQLite?

Greetings, elef

Have you tried any of the other different forms of compression IO::Compress offers? My personal experiences when creating archives, seems to indicate the xz algorithm provides better results, more often than not. I notice IO::Compress also offers IO::Compress::Xz. Of course all the algorithm's have different results given the type of input data. But thought it worth mentioning.

Best Wishes.

--Chris

#!/usr/bin/perl -Tw
use Perl::Always or die;
my $perl_version = (5.12.5);
print $perl_version;

Comment on Re^5: How do I read from a compressed SQLite FTS4 database with DBD::SQLite?

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Re^6: How do I read from a compressed SQLite FTS4 database with DBD::SQLite? by elef (Friar) on Nov 30, 2013 at 09:57 UTC
Thanks for the suggestion. I use ActivePerl on Widows and IO::Compress::Xz is not in PPM. I tried to install it from the cpan shell but running the script fails with `Can't locate auto/Compress/Raw/Lzma/autosplit.ix in @INC`. Maybe I will try to get the module installed in a linux VM and see how it performs. I do have IO::Compress::Zip so I tried that but the compressed db was much larger than the an uncompressed one with the same data... It's starting to look like I'm in a dead end. Again, I think the compression is failing this badly because each column in each record is compressed separately by the FTS engine and I have text here in small chunks (sentences). But I don't think it would be feasible to structure the db differently because of the way the data is used (you search for a term or phrase and the program shows you each sentence that it occurs in, along with its translation in a different language).	[reply] [d/l]
Re^7: How do I read from a compressed SQLite FTS4 database with DBD::SQLite? by taint (Chaplain) on Nov 30, 2013 at 19:54 UTC
Ahh, I hadn't thought Windows wouldn't have it. Sorry, my bad. I seem to remember that LZMA had an "off by one" issue, a few years ago. Maybe that's why it isn't yet in the ActiveState edition. Yea, I think the only way to accomplish your goal most effectively. Would be to compress the contents of the rows/tables, without compressing the tables/rows, themselves. But, as you seem to have stated, it's probably not feasible. Best wishes, elef. --Chris #!/usr/bin/perl -Tw use Perl::Always or die; my $perl_version = (5.12.5); print $perl_version;	[reply]