Question

Is it possible to get the size of the result-set when doing a query?

I need to set a proper MySQL cache_limit (MB) and therefore I am trying out some queries, but I need to know the sizes of the result-sets to fine-tune my cache configurations.

What exactly does query_cache_limit do when measuring the size of a query (or result)…

Answer 1

As a rouph estimate you coud try

<?php
// This is only an example, the numbers below will
// differ depending on your system

echo memory_get_usage() . "\n"; // 36640

$a = mysql_fetch_assoc($result);

echo memory_get_usage() . "\n"; // 57960

unset($a);

echo memory_get_usage() . "\n"; // 36744

?>

or

echo strlen(serialize(mysql_fetch_assoc($result)));