Transactional cursor error

Question

Hi there.
I am new to BDB and am using version 4.8.26.
I am experiencing an issue with the Db::cursor() method. It blows up with a DBException where the 'what' informs me "Error:Unable to create variable object"
Can someone please review the code below and tell me what I am doing wrong?
Thanks alot in advance!!
CTOR
          BDBManager(const std::string& env, u_int32_t pagesize, u_int32_t lg_buf_size): m_dbEnv(0){
               u_int32_t envflags =
                         DB_CREATE
                         | DB_RECOVER
                         | DB_INIT_TXN
                         | DB_INIT_MPOOL
                         | DB_INIT_LOG
                         | DB_INIT_LOCK;
               u_int32_t dbflags = DB_CREATE;//don't perform I/O to write to logging subsystem
               * because we are using transactions we need to make sure the
               * log file can hold at least a couple of
               m_dbEnv.set_lg_bsize(lg_buf_size);
               m_dbEnv.open(env.c_str(), envflags, 0);
               m_dbEnv.set_flags(DB_TXN_NOSYNC, 1);
               m_rawMsgs = new Db(&m_dbEnv, 0);
               m_rawMsgs->set_bt_compare(&sortkey);
               m_rawMsgs->open(NULL, "raw.db", NULL, DB_BTREE, dbflags, 0);
               m_state = new Db(&m_dbEnv, 0);
               m_state->set_bt_compare(&sortkey);
               m_state->set_pagesize(pagesize);
               m_state->set_flags(DB_DUPSORT);
               m_state->open(NULL, "state.db", NULL, DB_BTREE, dbflags, 0);
My Dodgy Method
          void openTxn(){
               m_currentTxn = NULL;
               m_putCurs = NULL;
               m_dbEnv.txn_begin(NULL, &m_currentTxn, 0);
               if(tx){
                    try{
                         m_state->cursor(m_currentTxn, &m_putCurs, 0);//cursor only needed for state
                    catch(DbException dbE){
                         m_state->err(dbE.get_errno(), dbE.what());
                    catch(std::exception e){
                         m_state->errx(e.what());
     private:
          static int sortkey(Db* db, const Dbt* a, const Dbt* z){
               u_int64_t aa,zz;
               memcpy(&aa, a->get_data(), sizeof(u_int64_t));
               memcpy(&zz, z->get_data(), sizeof(u_int64_t));
               return (aa-zz);
          DbEnv m_dbEnv;
          Db* m_rawMsgs;
          Db* m_state;
          DbTxn* m_currentTxn;
          Dbc* m_putCurs;

Answer 1

Hello,
"Error:Unable to create variable object" is not a Berkeley DB error.
Is there any issue with space where the program is being run? If you
are not compiling without optimization you could try that.
Are any other errors raised? You can also set verbose messaging
which could provide more information on what the problem is.
You can set verbose error messages with either:
http://download.oracle.com/docs/cd/E17076_02/html/api_reference/CXX/envset_errfile.html
http://download.oracle.com/docs/cd/E17076_02/html/api_reference/CXX/dbset_errfile.html
Thanks,
Sandra