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DbEnv::set_lk_detect |
#include <db_cxx.h>int DbEnv::set_lk_detect(u_int32_t detect);
int DbEnv::get_lk_detect(u_int32_t *lk_detectp);
Set if the deadlock detector is to be run whenever a lock conflict occurs, and specify what lock request(s) should be rejected. As transactions acquire locks on behalf of a single locker ID, rejecting a lock request associated with a transaction normally requires the transaction be aborted.
The database environment's deadlock detector configuration may also be configured 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 method detect parameter as a string; for example, "set_lk_detect DB_LOCK_OLDEST". Because the DB_CONFIG file is read when the database environment is opened, it will silently overrule configuration done before that time.
The DbEnv::set_lk_detect method configures a database environment, not only operations performed using the specified DbEnv handle.
The DbEnv::set_lk_detect method may be called at any time during the life of the application.
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 DbEnv::set_lk_detect method may fail and throw DbException, encapsulating one of the following non-zero errors, or return one of the following non-zero errors:
The DbEnv::get_lk_detect method returns the deadlock detector configuration.
The DbEnv::get_lk_detect method may be called at any time during the life of the application.
The DbEnv::get_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.
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