We are updating 400 to 500 thousand rows of data a week. our update takes about 2 days to finish.

That looks very slow.

But you don't give any useful information - perhaps 2 days is the best you can get. Some question to start with:

• What database?
• What queries?
• How many queries?
• How do the tables look like?
• Which indices are there?
• How large are the tables?
• How many other processes access the tables?
• Where's the time spend, in the database, or the program collecting the data?
• How much of the spend time are you waiting to get locks?
• Are you using transactions?
• Are other processes using transactions?
• Are you sure it's a Perl questions, and not a database/SQL question, better answered in a forum with more expertise?

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