### DbEnv::cdsgroup_begin |

`

###

    #include <db_cxx.h>

    int
    DbEnv::cdsgroup_begin(DbTxn **tid);

### Description: DbEnv::cdsgroup_begin

The DbEnv::cdsgroup_begin method allocates a locker ID in an environment configured for Berkeley DB Concurrent Data Store applications. It copies a pointer to a DbTxn that uniquely identifies the locker ID into the memory to which tid refers. Calling the DbTxn::commit method will discard the allocated locker ID.

See Berkeley DB Concurrent Data Store applications for more information about when this is required.

The DbEnv::cdsgroup_begin method may be called at any time during the life of the application.

The DbEnv::cdsgroup_begin 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.

### Errors

If the maximum number of lockers has been reached, the DbEnv::cdsgroup_begin method will fail and either return ENOMEM or throw a DbMemoryException.

### Class

DbEnv, DbTxn

### See Also

Transaction Subsystem and Related Methods`

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