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<title>Berkeley DB Reference Guide: Release 3.1: DB-&gt;stat</title>
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<td><dl><dt>Berkeley DB Reference Guide:<dd>Upgrading Berkeley DB Applications</dl></td>
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Release 3.1: DB-&gt;stat
For Btree database statistics, the <a href="../../api_c/db_stat.html">DB-&gt;stat</a> method field
bt_nrecs has been removed, replaced by two fields:
bt_nkeys and bt_ndata. The bt_nkeys field returns
a count of the unique keys in the database. The bt_ndata field
returns a count of the key/data pairs in the database. Neither exactly
matches the previous value of the bt_nrecs field, which returned
a count of keys in the database, but, in the case of Btree databases,
could overcount as it sometimes counted duplicate data items as unique
keys. The application should be searched for any uses of the
bt_nrecs field and the field should be changed to be either
bt_nkeys or bt_ndata, whichever is more appropriate.
For Hash database statistics, the <a href="../../api_c/db_stat.html">DB-&gt;stat</a> method field
hash_nrecs has been removed, replaced by two fields:
hash_nkeys and hash_ndata. The hash_nkeys field
returns a count of the unique keys in the database. The
hash_ndata field returns a count of the key/data pairs in the
database. The new hash_nkeys field exactly matches the previous
value of the hash_nrecs field. The application should be
searched for any uses of the hash_nrecs field, and the field
should be changed to be hash_nkeys.
For Queue database statistics, the <a href="../../api_c/db_stat.html">DB-&gt;stat</a> method field
qs_nrecs has been removed, replaced by two fields:
qs_nkeys and qs_ndata. The qs_nkeys field returns
a count of the unique keys in the database. The qs_ndata field
returns a count of the key/data pairs in the database. The new
qs_nkeys field exactly matches the previous value of the
qs_nrecs field. The application should be searched for any uses
of the qs_nrecs field, and the field should be changed to be
qs_nkeys.
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