There is indeed some overhead in Perl-arrays, so it is correct that the array will take more space in memory than in the MySQL-table.

But 10 queries per second is not much and MySQL should be able to keep up with that number of requests, assuming that the record ID you search on is indexed.

Another thing to consider: as you are speaking of web-pages, I assume your script will run on the web-server. Is it a CGI-script or does it run under mod_perl? If it is a simple CGI-script, you will have to build your array for every request and that will take ages. Under mod_perl you will only pay that start-up cost once, but I still think a SELECT into your data-table will be the best solution.

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

In reply to Re: read a huge mysql Table into memory by CountZero
in thread read a huge mysql Table into memory by hiX0r

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