Timesten transactions ERR TT8261

Question

Hi,
I'm implementing a middleware in JAVA connecting to networked timesten 7.0 data stores,
client operations are executed at data stores , I chosed cache group type "user managed" with an autorefresh every 180 min
I can insert tuples into the cached table from ttisql utility.
when the middleware starts transactions, i get the following error: TT8261
[TimesTen][TimesTen 7.0.5.0.0 ODBC Driver][TimesTen]TT8261: Cache groups operations may not be performed while XA transactions are active -- file "cache.c", lineno 5129, procedure "sbCacheXARunning()"
     at com.timesten.jdbc.JdbcOdbc.createSQLException(JdbcOdbc.java:3187)
     at com.timesten.jdbc.JdbcOdbc.standardError(JdbcOdbc.java:3321)
     at com.timesten.jdbc.JdbcOdbc.standardError(JdbcOdbc.java:3286)
     at com.timesten.jdbc.JdbcOdbc.SQLExecute(JdbcOdbc.java:802)
     at com.timesten.jdbc.JdbcOdbcPreparedStatement.execute(JdbcOdbcPreparedStatement.java:321)
     at connectionsToDBMSs.DBConnectionThread.run(DBConnectionThread.java:64)
before getting the error, the application executes successfully following operations for each transaction branch:
Connection conn = My_Oracle_XA_Connection.getConnection();
// Get the XA resources
XAResource oxar = My_Oracle_XA_Connection.getXAResource();
// Create the Xids With the Same Global Ids
Xid xid = new TimesTenXid(tb.mother_transaction.formatid,tb.mother_transaction.global_transaction_id, tb.branch_qualifier);
tb.setXid(xid);
// Start the Resources
oxar.start (xid, XAResource.TMNOFLAGS);
I get the error when executing
nbu = statement.executeUpdate();
rest of the code:
// END both the branches -- IMPORTANT
                    oxar.end(xid, XAResource.TMSUCCESS);
                    // Prepare the RMs
                    int prp = oxar.prepare(xid);
                    //System.out.println("DB" + tb.dblevel_in_group + " prepare " + prp);
                    // create an instance of ReplyToTransactionBranch
                    ReplyToTransactionBranch rtb;
                    if (tb.type){ //update, insert, delete
                         rtb = new ReplyToTransactionBranch(prp,oxar,conn,nbu);}
                    else {//select
                         rtb = new ReplyToTransactionBranch(prp,oxar,conn,crs);}
                    rtb.setDBLevel(tb.dblevel_in_group);
tb.mother_transaction.owner.getReplyQueue().enqueueReply(rtb, tb.number-1);
                    tb.mother_transaction.owner.plusReply();
                    if(tb.mother_transaction.owner.check_recv_sent_eq())
                         tb.mother_transaction.owner.getRepFromDBConnThreads().notify_waiting_thread();
The waiting thread executes the following code
boolean do_commit = true;
               int r;
               int prep;
               for(r = 0; r < Number_of_sent_queries; r++){
                    prep = My_Reply_Queue.getReplyAt(r).prepare;
                    if (!((prep == XAResource.XA_OK) || (prep == XAResource.XA_RDONLY)))
          do_commit = false;
Iterator<TransactionBranch> it2 = transaction.getTransactionBranches().iterator();
          r = 0;
          while ( it2.hasNext() ){
               TransactionBranch tb2 = it2.next();
               prep = My_Reply_Queue.getReplyAt(r).prepare;
               if (prep == XAResource.XA_OK){
                    if (do_commit)     { //System.out.println("Commit " + tb2);
                         My_Reply_Queue.getReplyAt(r).oxar.commit(tb2.xid, false); }
               else { //System.out.println("Rollback " + tb2);
                    My_Reply_Queue.getReplyAt(r).oxar.rollback(tb2.xid); }
               // close connections
               My_Reply_Queue.getReplyAt(r).conn.close();
r++;
               }// &while
          // wake up Recovery Worker or any thread waiting on 'res'
          this.synchWithWorker.notify_waiting_thread();
               My_Reply_Queue.getReplyAt(r).conn = null;
Cheers,
p.s.: the code works executes correctly with oracle DB backends

Answer 1

You can use XA transactions or Cache Connect but not both. You can access TimesTen cached tables outside of XA transactions but not within them. You can access regular (non-replicated) TimesTen tables within XA transactions.
Note that XA transactions are by their nature fairly slow. Using TimesTen is unlikely to speed up an XA transaction significantly...
Chris