#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 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 DbEnv::set_verbose method may fail and throw an exception or return a non-zero error for the following conditions:

EINVAL

An invalid flag value or parameter was specified.

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. If a catastrophic error has occurred, the DbEnv::set_verbose method may fail and either return DB_RUNRECOVERY or throw an exception encapsulating DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.

Class

See Also