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Berkeley DB: DbEnv::set_lk_detect
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DbEnv::set_lk_detect
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#include <db_cxx.h>
int
DbEnv::set_lk_detect(u_int32_t detect);
int
DbEnv::get_lk_detect(u_int32_t *lk_detectp);
Description: DbEnv::set_lk_detect
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.
Parameters
detect- The detect parameter configures the deadlock detector. The
specified value must be one of the following list:
DB_LOCK_DEFAULT- Use whatever lock policy was specified when the database environment
was created. If no lock policy has yet been specified, set the lock
policy to DB_LOCK_RANDOM.
DB_LOCK_EXPIRE- Reject lock requests which have timed out. No other deadlock detection
is performed.
DB_LOCK_MAXLOCKS- Reject the lock request for the locker ID with the most locks.
DB_LOCK_MAXWRITE- Reject the lock request for the locker ID with the most write locks.
DB_LOCK_MINLOCKS- Reject the lock request for the locker ID with the fewest locks.
DB_LOCK_MINWRITE- Reject the lock request for the locker ID with the fewest write locks.
DB_LOCK_OLDEST- Reject the lock request for the locker ID with the oldest lock.
DB_LOCK_RANDOM- Reject the lock request for a random locker ID.
DB_LOCK_YOUNGEST- Reject the lock request for the locker ID with the youngest lock.
Errors
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:
EINVAL- An
invalid flag value or parameter was specified.
Description: DbEnv::get_lk_detect
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.
Parameters
lk_detectp- The DbEnv::get_lk_detect method returns the
deadlock detector configuration in lk_detectp.
Class
DbEnv, DbLock
See Also
Locking Subsystem and Related Methods
Copyright (c) 1996,2008 Oracle. All rights reserved.