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<title>Berkeley DB: Db::set_feedback</title>
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<h1>Db::set_feedback</h1>
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#include <db_cxx.h>
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void (*db_feedback_fcn)(DB *dbp, int opcode, int pct));
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<p>Some operations performed by the Berkeley DB library can take non-trivial
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amounts of time. The Db::set_feedback method can be used by
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applications to monitor progress within these operations.
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<p>When an operation is likely to take a long time, Berkeley DB will call the
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specified callback method. This method must be declared with
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three arguments: the first will be a reference to the enclosing database
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handle; the second a flag value; and the third the percent of the
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operation that has been completed, specified as an integer value between
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0 and 100. It is up to the callback method to display this
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information in an appropriate manner.
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<p>The <b>opcode</b> argument may take on any of the following values:
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<p><dt><a name="DB_UPGRADE">DB_UPGRADE</a><dd>The underlying database is being upgraded.
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<p><dt><a name="DB_VERIFY">DB_VERIFY</a><dd>The underlying database is being verified.
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<p>The Db::set_feedback interface may be called at any time during the life of
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<p>The Db::set_feedback method either returns a non-zero error value or throws an exception that
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encapsulates a non-zero error value on failure, and returns 0 on success.
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