pl/perl problem of memory

Hi,

I load data in a varible of type text, and i arrive to out of memory message.

I want to know if it exists a function which allows to empty a variable and the place uses in memory without destroy it (because I use the variable again).

In fact, now i put the variable to '' ( $myvar = '' ) but it seems that Perl don't empty totally memory.

Best regards,

Nicolas Giroire