I'm not sure but I think there is a bug in the sdbm module.
The same code runs fine on intel hardware but not on my alpha.
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I found this by running subversion which calls apr_dbm_* and like functions. Every time subversion calls apr_dbm_exists(dbm, key) this funtion returns false (Verified with gdb).
FWIW some 64-bit bugs were fixed in the sdbm interface some time ago (Jan 23 2003)... the first Apache release with the fix was 2.0.45... hopefully you're using newer code that that... otherwise, upgrade!