I have a perl script that is doing a CTAS. The table creates successfully (I can query the table after program exits with error). The reason it is exiting with an error is because the return code from the execute is undef. On smaller create tables this same code works fine. On larger longer running queries (about 40 min) is when it gets the return value of undf On the connect RaiseError is turned off. Below is the execute statement. 
$sth->execute() or do {
        $msg = "ERROR:$0: Error in SQL execute:\n$DBI::errstr";
        $dbh->rollback();
        confess "$msg";
    };

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Has anyone come across this before or how can one not trip the error in this case? Below is trace from a run: 
    DBI::st=HASH(0x15783d0) trace level set to 0x0/14 (DBI @ 0x0/0) in
+ DBI 1.609-ithread (pid 26383)
    -> execute for DBD::Oracle::st (DBI::st=HASH(0x16e9b28)~0x15783d0)
+ thr#154e010
   dbd_st_execute CREATE (out0, lob0)...
Statement Execute Mode is 0 (DEFAULT)
        OCIStmtExecute(19c18d8,19cd328,19b9f68,1,0,0,0,mode=DEFAULT,0)
+=SUCCESS
        OCIAttrGet(19cd328,OCI_HTYPE_STMT,7fffb492eec8,0,OCI_ATTR_ROW_
+COUNT,19b9f68)=SUCCESS
        OCIAttrGet(19cd328,OCI_HTYPE_STMT,7fffb492eece,0,OCI_ATTR_SQLF
+NCODE,19b9f68)=SUCCESS
        dbd_st_execute CREATE returned (SUCCESS, rpc2211750915, fn1, o
+ut0)
    <- execute= undef at ./test_query.pl line 80
    -> finish for DBD::Oracle::st (DBI::st=HASH(0x16e9b28)~0x15783d0) 
+thr#154e010
    <- finish= 1 at ./test_query.pl line 98
    -> DESTROY for DBD::Oracle::st (DBI::st=HASH(0x15783d0)~INNER) thr
+#154e010
        dbd_st_destroy
        OCIHandleFree(19cd328,OCI_HTYPE_STMT)=SUCCESS
    <- DESTROY= undef

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In reply to sth->execute returns undef when successful by Anonymous Monk

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