h_nelem.so

berkeley db 4.6.21的源码。berkeley db是一个简单的数据库管理系统

m4_comment([$Id: h_nelem.so,v 10.12 2000/03/18 21:43:08 bostic Exp $])

m4_ref_title(Access Methods,
    Hash table size, @hash table size, am_conf/h_hash, am_conf/recno)

m4_p([dnl
When setting up the hash database, knowing the expected number of elements
that will be stored in the hash table is useful.  This value can be used
by the Hash access method implementation to more accurately construct the
necessary number of buckets that the database will eventually require.])

m4_p([dnl
The anticipated number of elements in the hash table can be specified by
calling the m4_refT(dbh_set_h_nelem).  If not specified, or set too low,
hash tables will expand gracefully as keys are entered, although a slight
performance degradation may be noticed.  In order for the estimated number
of elements to be a useful value to m4_db, the m4_refT(dbh_set_h_ffactor)
must also be called to set the page fill factor.])

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