# DBENV->set_verbose

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    #include <db.h>

    int
    DBENV->set_verbose(DB_ENV *dbenv, u_int32_t which, int onoff);

# Description

The DBENV->set_verbose function 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 function returns a non-zero error value on failure and 0 on success.

The database 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". Because the DB_CONFIG file is read when the database environment is opened, it will silently overrule configuration done before that time.

# Errors

EINVAL
  An invalid flag value or parameter was specified.

# See Also

DBENV->close, db_env_create, DBENV->open, DBENV->remove, DBENV->err, db_strerror, db_version, DBENV->set_cachesize, DBENV->set_errcall, DBENV->set_errfile, DBENV->set_errpfx, DBENV->set_flags, DBENV->set_mutexlocks, DBENV->set_paniccall, and DBENV->set_verbose.`

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