Re^3: fastest method to use DBI

[targetsmart]

in reply to Re^2: fastest method to use DBI
in thread fastest method to use DBI

is it the right way to get the fastest fetch?
I don't know, you have run it and give some statistics on the time taken, memory consumption of the perl program, etc.

It would be great help if get an expert comment on the code
I am not a database expert, but IMHO using the database query's OFFSET AND LIMIT is the best way to fetch huge number of records, it is will take only minimum memory(depending on the offset and limit values), and effective values for limit will enable you to fetch all records in a optimum number of fetch cycles.

[zwon]

Let me to oppose. OFFSET is not good for performance at all (BTW there's no OFFSET in Oracle AFAIK). When you executing query like

SELECT name,phone ORDER BY name OFFSET 1000000 LIMIT 10

your database should iterate over first 1000000 records before it will start returning records, this is very slow.