#include <db_cxx.h> int DbEnv::get_memory_init(DB_MEM_CONFIG type, u_int32_t *countp);
The DbEnv::get_memory_init() method returns
the number of objects to allocate and initialize when an
environment is created. The count is returned for a specific named
structure. The count for each structure is set using the
DbEnv::set_memory_init()
method.
The DbEnv::get_memory_init() method may be
called at any time during the life of the application.
The DbEnv::get_memory_init()
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 struct parameter identifies the structure for which you want an object count returned. It must be one of the following values:
DB_MEM_DATABASE
Initialize the number of databases in the environment.
DB_MEM_DATABASE_LENGTH
Initialize the maximum combined length of a database's directory and name strings.
DB_MEM_EXTFILE_DATABASE
Initialize the number of database files and subdatabases using external files.
DB_MEM_LOCK
Initialize locks. A thread uses this structure to lock a page (or record for the QUEUE access method) and hold it to the end of a transaction.
DB_MEM_LOCKOBJECT
Initialize lock objects. For each page (or record) which is locked in the system, a lock object will be allocated.
DB_MEM_LOCKER
Initialize lockers. Each thread which is active in a transactional environment will use a locker structure either for each transaction which is active, or for each non-transactional cursor that is active.
DB_MEM_LOGID
Initialize the log fileid structures. For each database handle which is opened for writing in a transactional environment, a log fileid structure is used.
DB_MEM_REP_SITE
If using replication, initialize the maximum number of sites in the replication group.
DB_MEM_TRANSACTION
Initialize transaction structures. Each active transaction uses a transaction structure until it either commits or aborts.
DB_MEM_THREAD
Initialize thread identification structures. If thread tracking is enabled then each active thread will use a structure. Note that since a thread does not signal the BDB library that it will no longer be making calls, unused structures may accumulate until a cleanup is triggered either using a high water mark or by running DbEnv::failchk() .