Below is the trace: Fyi: the perl script in question reads in metadata and builds out the create table statement then calls a procedure that does the prepare, execute and finish. For the trace I copied the CTAS it was executing and put it in a simple perl script with RaiseError. Just to see how that would work. With RaiseError it does not get an error, but you can see it is returning the undef. Thank you for the repsoneses so far. 
 DBI::st=HASH(0x15783d0) trace level set to 0x0/14 (DBI @ 0x0/0) in DB
+I 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 Re^2: sth->execute returns undef when successful by Anonymous Monk
in thread sth->execute returns undef when successful by Anonymous Monk

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