DBI bind_param_inout question

The syntax is $csr->bind_param_inout(':var',\$perlvar,$maxlength)

My question is what is $maxlength in relation to the database.

If my statement is returning a number (a sequence value) how big do I  
need it to be?

My sql is

insert into reservedroom (id, requesttime, roomid, day, purpose,  
reserver,email, affil,requesterpid)  
values 
(reservedid 
.nextval,sysdate,:roomid,:theday,:purp,:reserve,:remail,:affil,:pid)  
returning id into :newrez"

and the bind_param_inout parameter is :newrez.

This value will never get higher than 999,999,999 (the database has  
been running for 6 or 7 years now and currval = 127,616).

-- 
Bruce Johnson
University of Arizona
College of Pharmacy
Information Technology Group

Institutions do not have opinions, merely customs