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<title>Berkeley DB: DbEnv::set_verbose</title>
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<h1>DbEnv::set_verbose</h1>
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#include <db_cxx.h>
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DbEnv::set_verbose(u_int32_t which, int onoff);
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<p>The DbEnv::set_verbose method turns additional informational and
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debugging messages in the Berkeley DB message output on and off. If
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<b>onoff</b> is set to
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the additional messages are output.
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<p>The <b>which</b> parameter must be set to one of the following values:
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<p><dt><a name="DB_VERB_CHKPOINT">DB_VERB_CHKPOINT</a><dd>Display checkpoint location information when searching the log for
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<p><dt><a name="DB_VERB_DEADLOCK">DB_VERB_DEADLOCK</a><dd>Display additional information when doing deadlock detection.
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<p><dt><a name="DB_VERB_RECOVERY">DB_VERB_RECOVERY</a><dd>Display additional information when performing recovery.
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<p><dt><a name="DB_VERB_REPLICATION">DB_VERB_REPLICATION</a><dd>Display additional information when processing replication messages.
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<p><dt><a name="DB_VERB_WAITSFOR">DB_VERB_WAITSFOR</a><dd>Display the waits-for table when doing deadlock detection.
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<p>The DbEnv::set_verbose method configures operations performed using the specified
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<a href="../api_cxx/env_class.html">DbEnv</a> handle, not all operations performed on the underlying
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<p>The DbEnv::set_verbose interface may be called at any time during the life of
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<p>The DbEnv::set_verbose 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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<p>The database environment's verbosity may also be set using the environment's
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<b>DB_CONFIG</b> file. The syntax of the entry in that file is a
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single line with the string "set_verbose", one or more whitespace characters,
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and the interface <b>which</b> argument as a string; for example,
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"set_verbose DB_VERB_CHKPOINT". Because the <b>DB_CONFIG</b> file is read when the database
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environment is opened, it will silently overrule configuration done
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<p>The DbEnv::set_verbose method may fail and throw an exception or return a non-zero error for the following conditions:
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<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
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<p>The DbEnv::set_verbose method may fail and throw an exception or return a non-zero error for errors specified for other Berkeley DB and C library or system methods.
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If a catastrophic error has occurred, the DbEnv::set_verbose method may fail and
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either return <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a> or throw a
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<a href="../api_cxx/runrec_class.html">DbRunRecoveryException</a>,
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in which case all subsequent Berkeley DB calls will fail in the same way.
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<a href="../api_cxx/env_class.html">DbEnv</a>
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<a href="../api_cxx/env_list.html">Database Environments and Related Methods</a>
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