Problem copying data from postgres to Oracle via dg4odbc

Question

Hi All,
I am trying to migrate data from a postgres moodle database to an oracle one.  I have set up dg4odbc and it is mainly working, except when I try to insert select for some tables only.
Eg.
SQL*Plus: Release 11.2.0.3.0 Production on Wed Feb 12 13:28:37 2014
Copyright (c) 1982, 2011, Oracle.  All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> insert into M_ASSIGNFEEDBACK_COMMENTS(
assignment
,commenttext
,commentformat
,id
,grade
select
"assignment"
,"commenttext"
,"commentformat"
,"id"
,"grade"
from "mdl_assignfeedback_comments"@"to_moodle";
  2    3    4    5    6    7    8    9  10  11  12  13  14  insert into M_ASSIGNFEEDBACK_COMMENTS(
ERROR at line 1:
ORA-28502: internal communication error on heterogeneous database link
ORA-02063: preceding line from TO_MOODLE
But the select part of the statement works.
SQL> select "assignment" ,"commenttext" ,"commentformat" ,"id" ,"grade" from "mdl_assignfeedback_comments"@"to_moodle";
2 3 4 5 6 7 assignment
commenttext
commentformat id grade
4
Excellent work
1 1 1 5 1 2 2 10
Excellent work
1 3 3 11 1 4 4
SQL>
And it works if I leave out the commenttext field which is of postgres type text
1 insert into M_ASSIGNFEEDBACK_COMMENTS(
2 assignment
3 ,commentformat
4 ,id
5 ,grade
6 )
7 select
8 "assignment"
9 ,"commentformat"
10 ,"id"
11 ,"grade"
12* from "mdl_assignfeedback_comments"@"to_moodle"
SQL> /
4 rows created.
Other text fields in other tables seem to work fine however.
My database and the postgres database are Unicode character set
NLS_CHARACTERSET AL32UTF8
NLS_NCHAR_CHARACTERSET AL16UTF16
My initmdl_dev23.ora config
HS_FDS_CONNECT_INFO = MDL_DEV23
HS_FDS_TRACE_LEVEL = 4
HS_FDS_TRACE_FILE_NAME=/tmp/ora_hs_trace.log
HS_FDS_SHAREABLE_NAME = /usr/lib64/libodbc.so
HS_LANGUAGE=american_america.we8mswin1252 # this had to be set due to some bug with the postgres connection?
HS_NLS_NCHAR=UCS2
HS_FDS_REMOTE_DB_CHARSET=AL32UTF8
HS_KEEP_REMOTE_COLUMN_SIZE=LOCAL
# ODBC specific environment variables #
set ODBCINI=/etc/odbc.ini
Table Desc Oracle
SQL> desc M_ASSIGNFEEDBACK_COMMENTS
Name                      Null?    Type
ID                      NOT NULL NUMBER(10)
ASSIGNMENT                  NOT NULL NUMBER(10)
GRADE                      NOT NULL NUMBER(10)
COMMENTTEXT                        CLOB
COMMENTFORMAT                  NOT NULL NUMBER(4)
Table Desc Postgres
mdl_dev23=> \d mdl_assignfeedback_comments
                            Table "public.mdl_assignfeedback_comments"
    Column    |  Type  |                                Modifiers                    
---------------+----------+----------------------------------------------------------------
id            | bigint  | not null default nextval('mdl_assignfeedback_comments_id_seq'::
regclass)
assignment    | bigint  | not null default 0
grade        | bigint  | not null default 0
commenttext  | text    |
commentformat | smallint | not null default 0

Answer 1

Here is the info for the table that works:-
Oracle Table
SQL> desc m_assign
Name                       Null?    Type
ID                       NOT NULL NUMBER(10)
COURSE                    NOT NULL NUMBER(10)
NAME                       NOT NULL VARCHAR2(255 CHAR)
INTRO                       NOT NULL CLOB
INTROFORMAT                   NOT NULL NUMBER(4)
ALWAYSSHOWDESCRIPTION               NOT NULL NUMBER(2)
NOSUBMISSIONS                   NOT NULL NUMBER(2)
SUBMISSIONDRAFTS               NOT NULL NUMBER(2)
SENDNOTIFICATIONS               NOT NULL NUMBER(2)
SENDLATENOTIFICATIONS               NOT NULL NUMBER(2)
DUEDATE                   NOT NULL NUMBER(10)
ALLOWSUBMISSIONSFROMDATE           NOT NULL NUMBER(10)
GRADE                       NOT NULL NUMBER(10)
TIMEMODIFIED                   NOT NULL NUMBER(10)
REQUIRESUBMISSIONSTATEMENT           NOT NULL NUMBER(2)
COMPLETIONSUBMIT               NOT NULL NUMBER(2)
CUTOFFDATE                   NOT NULL NUMBER(10)
TEAMSUBMISSION                NOT NULL NUMBER(2)
REQUIREALLTEAMMEMBERSSUBMIT           NOT NULL NUMBER(2)
TEAMSUBMISSIONGROUPINGID           NOT NULL NUMBER(10)
BLINDMARKING                   NOT NULL NUMBER(2)
REVEALIDENTITIES               NOT NULL NUMBER(2)
ATTEMPTREOPENMETHOD               NOT NULL VARCHAR2(10 CHAR)
MAXATTEMPTS                   NOT NULL NUMBER(6)
MARKINGWORKFLOW               NOT NULL NUMBER(2)
MARKINGALLOCATION               NOT NULL NUMBER(2)
Postgres table
mdl_dev23=> \d mdl_assign
                                           Table "public.mdl_assign"
           Column            |          Type          |                        Modifiers                       
-----------------------------+------------------------+---------------------------------------------------------
id                          | bigint                 | not null default nextval('mdl_assign_id_seq'::regclass)
course                      | bigint                 | not null default 0
name                        | character varying(255) | not null default ''::character varying
intro                       | text                   | not null
introformat                 | smallint               | not null default 0
alwaysshowdescription       | smallint               | not null default 0
nosubmissions               | smallint               | not null default 0
submissiondrafts            | smallint               | not null default 0
sendnotifications           | smallint               | not null default 0
sendlatenotifications       | smallint               | not null default 0
duedate                     | bigint                 | not null default 0
allowsubmissionsfromdate    | bigint                 | not null default 0
grade                       | bigint                 | not null default 0
timemodified                | bigint                 | not null default 0
requiresubmissionstatement  | smallint               | not null default 0
completionsubmit            | smallint               | not null default 0
cutoffdate                  | bigint                 | not null default 0
teamsubmission              | smallint               | not null default 0
requireallteammemberssubmit | smallint               | not null default 0
teamsubmissiongroupingid    | bigint                 | not null default 0
blindmarking                | smallint               | not null default 0
revealidentities            | smallint               | not null default 0
attemptreopenmethod         | character varying(10)  | not null default 'none'::character varying
maxattempts                 | integer                | not null default (-1)
markingworkflow             | smallint               | not null default 0
markingallocation           | smallint               | not null default 0
Indexes:
    "mdl_assi_id_pk" PRIMARY KEY, btree (id)
    "mdl_assi_cou_ix" btree (course)
    "mdl_assi_tea_ix" btree (teamsubmissiongroupingid)
Insert works fine
SQL> insert into M_ASSIGN(
markingworkflow
,blindmarking
,completionsubmit
,sendlatenotifications
,sendnotifications
,name
,teamsubmissiongroupingid
,timemodified
,duedate
,introformat
,attemptreopenmethod
,revealidentities
,cutoffdate
,submissiondrafts
,course
,alwaysshowdescription
,intro
,maxattempts
,requireallteammemberssubmit
,teamsubmission
,requiresubmissionstatement
,allowsubmissionsfromdate
,nosubmissions
,id
,markingallocation
,grade
select
"markingworkflow"
,"blindmarking"
,"completionsubmit"
,"sendlatenotifications"
,"sendnotifications"
,nvl("name",' ')
,"teamsubmissiongroupingid"
,"timemodified"
,"duedate"
,"introformat"
  2    3    4    5    6    7    8    9   10   11   12   13   14   15   16   17   18   19   20   21   22   23   24   25   26   27   28   29   30   31   32   33   34   35   36   37   38   39   40  ,nvl("attemptreopenmethod",' ')
,"revealidentities"
,"cutoffdate"
,"submissiondrafts"
,"course"
,"alwaysshowdescription"
,"intro"
,"maxattempts"
,"requireallteammemberssubmit"
,"teamsubmission"
,"requiresubmissionstatement"
,"allowsubmissionsfromdate"
,"nosubmissions"
,"id"
,"markingallocation"
,"grade"
from "mdl_assign"@"to_moodle";
41   42   43   44   45   46   47   48   49   50   51   52   53   54   55   56 
20 rows created.
Link to trace file for "working" insert
https://www.dropbox.com/s/blplgfuzsjds9ht/mdl_dev23_agt_12834.trc