> I've done some manual benchmarking running my script 'time script.pl'
> I realise my script uses some of the time, bench marking shows that
> %50 of the time is spent in dbd:execute.
The perl drivers don't currently use database level prepared statements
which would give a small boost.
But your best bet is to switch to using COPY instead of INSERT. Two ways
to do this.
1) Drop DBD::Pg and switch to the Pg driver for Perl instead (non-DBI
compliant) which has functions similar to putline() that allow COPY to
be used.
2) Have your perl script output a .sql file with the data prepared (COPY
statements) which you feed into the database via psql.
You can probably achieve a 50% increase in throughput.
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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
