#include <db_cxx.h> int Db::get_pagesize(u_int32_t *pagesizep);
        The Db::get_pagesize() method returns the database's current page size, as
        set by the Db::set_pagesize()
        method. Note that if Db::set_pagesize() was not called by your
        application, then the default pagesize is selected based on the underlying filesystem I/O block size.
        If you call Db::get_pagesize() before you have opened the
        database, the value returned by this method is therefore the underlying filesystem I/O block size.
    
         The Db::get_pagesize() method may be called only after the database has been opened.
    
         The Db::get_pagesize() 
            
            
                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.