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Berkeley DB: DbEnv::set_lk_detect
DbEnv::set_lk_detect
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#include <db_cxx.h>
int
DbEnv::set_lk_detect(u_int32_t 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_MAXLOCKS
- Abort the transaction with the
greatest number of locks.
- DB_LOCK_MINLOCKS
- Abort the transaction with the
fewest locks.
- DB_LOCK_MINWRITE
- Abort the transaction with the
fewest write locks.
- 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 be used only 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 database 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 detect argument 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.
Errors
The DbEnv::set_lk_detect 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.
Called after DbEnv::open was called.
The DbEnv::set_lk_detect 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_lk_detect 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
DbEnv, DbLock
See Also
DbEnv::set_lk_conflicts,
DbEnv::set_lk_detect,
DbEnv::set_lk_max,
DbEnv::set_lk_max_lockers,
DbEnv::set_lk_max_locks,
DbEnv::set_lk_max_objects,
DbEnv::lock_detect,
DbEnv::lock_get,
DbEnv::lock_id,
DbLock::put,
DbEnv::lock_stat,
and
DbEnv::lock_vec.
Copyright Sleepycat Software
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