# DbEnv::set_verbose

`

###

    #include <db_cxx.h>

    int
    DbEnv::set_verbose(u_int32_t which, int onoff);

# Description

The DbEnv::set_verbose method turns additional informational and debugging messages in the Berkeley DB message output on and off. If onoff is set to non-zero, the additional messages are output.

The which parameter must be set to one of the following values:

DB_VERB_CHKPOINT
  Display checkpoint location information when searching the log for checkpoints.

DB_VERB_DEADLOCK
  Display additional information when doing deadlock detection.

DB_VERB_RECOVERY
  Display additional information when performing recovery.

DB_VERB_WAITSFOR
  Display the waits-for table when doing deadlock detection.

The DbEnv::set_verbose interface may be used to configure Berkeley DB at any time during the life of the application.

The DbEnv::set_verbose method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success.

The environment's verbosity may also be set using the environment's DB_CONFIG file. The syntax of the entry in that file is a single line with the string "set_verbose", one or more whitespace characters, and the interface which argument as a string, for example, "set_verbose DB_VERB_CHKPOINT". Configuration in the DB_CONFIG file silently overrules configuration done using the DbEnv::set_verbose method.

# Errors

EINVAL
  An invalid flag value or parameter was specified.

### Class

DbEnv

# See Also

DbEnv::close, DbEnv::open, DbEnv::remove, DbEnv::err, DbEnv::strerror, DbEnv::version, DbEnv::set_cachesize, DbEnv::set_errcall, DbEnv::set_errfile, DbEnv::set_error_stream, DbEnv::set_errpfx, DbEnv::set_paniccall, and DbEnv::set_verbose.`

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