SDBM_File のサイズ制限

There are a number of limits on the size of the data that you can store in the SDBM file. The most important is that the length of a key, plus the length of its associated value, may not exceed 1008 bytes.

SDBM_File - Tied access to sdbm files - metacpan.org

MENTA や NanoA では現状 SDBM_File をセッション情報のストレージとして使っているんだけど... これは... よくないなぁ >