#include <db_cxx.h>

int
DbEnv::set_lk_detect(u_int32_t lk_detect);

Description

Set if the deadlock detector is to be run whenever a lock conflict occurs, and specify which transaction should be aborted in the case of a deadlock. The specified value must be one of the following list:

DB_LOCK_DEFAULT

Use the default policy as specified by db_deadlock.

DB_LOCK_OLDEST

Abort the oldest transaction.

DB_LOCK_RANDOM

Abort a random transaction involved in the deadlock.

DB_LOCK_YOUNGEST

Abort the youngest transaction.

The DbEnv::set_lk_detect interface may only be used to configure Berkeley DB before the DbEnv::open interface is called.

The DbEnv::set_lk_detect 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 deadlock detector configuration 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_lk_detect", one or more whitespace characters, and the interface lk_detect argument as a string, for example, "set_lk_detect DB_LOCK_OLDEST". Configuration in the DB_CONFIG file silently overrules configuration done using the DbEnv::set_lk_detect method.

Errors

EINVAL

An invalid flag value or parameter was specified.

Called after DbEnv::open was called.

Classes

See Also