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Berkeley DB: db count
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db count
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db count key
Description(db count)
The db count command returns a count of the number of duplicate
data items for the key given. If the key does not exist, a value of 0
is returned. If there are no duplicates, or if the database does not
support duplicates, but a key/data pair exists, a value of 1 is
returned. If an error occurs, a Berkeley DB error message is returned or a
Tcl error is thrown.
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