# DB_ENV->set_verbose

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    #include <db.h>

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

# Description

The DB_ENV->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_REPLICATION
  Display additional information when processing replication messages.

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

The DB_ENV->set_verbose method configures operations performed using the specified DB_ENV handle, not all operations performed on the underlying database environment.

The DB_ENV->set_verbose interface may be called at any time during the life of the application.

The DB_ENV->set_verbose method 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

The DB_ENV->set_verbose method may fail and return a non-zero error for the following conditions:

EINVAL
  An invalid flag value or parameter was specified.

The DB_ENV->set_verbose method may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions. If a catastrophic error has occurred, the DB_ENV->set_verbose method may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.

# Class

DB_ENV

# See Also

Database Environments and Related Methods`

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