Comment 7 for bug 530456

Another one with mysqltuner-2.1-rev17 and 5.1.40-log MySQL Community Server :

Query cache efficiency (%): 0.00
Use of uninitialized value in pattern match (m//) at mysqltuner.pl line 223 (#1)
    (W uninitialized) An undefined value was used as if it were already
    defined. It was interpreted as a "" or a 0, but maybe it was a mistake.
    To suppress this warning assign a defined value to your variables.

    To help you figure out what was undefined, perl tells you what operation
    you used the undefined value in. Note, however, that perl optimizes your
    program and the operation displayed in the warning may not necessarily
    appear literally in your program. For example, "that $foo" is
    usually optimized into "that " . $foo, and the warning will refer to
    the concatenation (.) operator, even though there is no . in your
    program.

Use of uninitialized value in concatenation (.) or string at mysqltuner.pl line
        230 (#1)
Use of uninitialized value in string eq at mysqltuner.pl line 231 (#1)
% query cache used:
Query cache low memory prunes: 0.00 per day