InterMedia Text with USER_DATASTORE and ORA-03113

Question

Hi,
I have problems using Oracle's InterMedia Text-index with a
USER_DATASTORE. I'm using Oracle 8.1.7 on Windows NT 4.0.
What I try to do is to create a context-index on multiple columns
of multiple tables. I created a table containing the original
tablenames and primary keys plus a char(1)-column to index, a
user_datastore, a procedure in a user-schema, a
wrapping-procedure in ctxsys' schema and finally the index. All
works fine so far but I get an ORA-03113 "end-of-file on
communication channel" error when querying the table with
contains. The procedure itself works.
Here's what I tried in detail:
I created a table "alldocs" containing the tablename and
primary-key-value of each line of each table plus a dummy-column
for the index:
create table alldocs(
table varchar2(30) not null,
id number not null,
data char(1),
primary key(tabelle, id)
I filled this table:
insert into alldocs (select 'MYDOCS', id, 'a' from mydocs);
insert into alldocs (select 'OTHERDOCS', id, 'b' from otherdocs);
The user's procedure - only dummy for testing - is:
create procedure test.GetAllDocsData(row IN ROWID, data IN OUT
NOCOPY CLOB) IS
     tabname varchar2(30);
     myid     number;
     tmpclob clob;
begin
     dbms_lob.createtemporary(tmpclob, TRUE);
     dbms_lob.writeappend(tmpclob, 34, 'Ein Text mit ca. 20
Zeichen Ldnge.');
     data := tmpclob;
end;
In ctxsys' schema I defined the following procedure and the
datastore:
create or replace procedure sysGetAllDocsData(rid in rowid, tlob
in out clob) is
begin
test.GetAllDocsData(rid, tlob);
end sysGetAllDocsData;
grant execute on sysGetAllDocsData to test;
call ctx_ddl.create_preference('MyUserDS', 'user_datastore');
call ctx_ddl.set_attribute('MyUserDS', 'procedure',
'sysGetAllDocsData');
call ctx_ddl.set_attribute('MyUserDS', 'output_type', 'CLOB');
Finally I defined the index:
create index test.alldocs_ctx on test.alldocs(data)
     indextype is ctxsys.context
     parameters ('DATASTORE CTXSYS.MyUserDS FILTER
CTXSYS.INSO_FILTER LEXER BASIC_LEXER');
This all works without errors. But when querying like this:
select * from test.alldocs where contains('data', 'Text')>0
the answer is
ORA-03113: end-of-file on communication channel
I hope someone can help.
Greetings
Ralf

Answer 1

Hi Ralf,
please define first your own preferences like this:
exec CTX_DDL.drop_preference('MY_LEXER');
exec CTX_DDL.create_preference('MY_LEXER','BASIC_LEXER');
exec CTX_DDL.set_attribute('MY_LEXER','ALTERNATE_SPELLING',
'GERMAN');
exec CTX_DDL.set_attribute('MY_LEXER','BASE_LETTER','YES');
exec CTX_DDL.set_attribute('MY_LEXER','MIXED_CASE', 'NO');
exec CTX_DDL.set_attribute('MY_LEXER','INDEX_THEMES','NO');
exec CTX_DDL.set_attribute('MY_LEXER','INDEX_TEXT', 'YES');
exec CTX_DDL.set_attribute('MY_LEXER','COMPOSITE', 'GERMAN');
exec ctx_ddl.Drop_Preference ('MY_FILTER');
exec ctx_ddl.Create_Preference ('MY_FILTER','NULL_FILTER');
exec ctx_ddl.drop_section_group ('MY_SECTION');
exec ctx_ddl.create_section_group
('MY_SECTION','NULL_SECTION_GROUP');
and then create your index with this preferences. You only need
an INSO filter if you want to index pdf,word,...
create index test.alldocs_ctx on test.alldocs(data)
     indextype is ctxsys.context
     parameters ('DATASTORE CTXSYS.MyUserDS FILTER
CTXSYS.INSO_FILTER LEXER BASIC_LEXER');create index test.alldocs_ctx on test.alldocs(data)
     indextype is ctxsys.context
     parameters ('
DATASTORE CTXSYS.MyUserDS
lexer MY_LEXER
filter MY_FILTER
section group MY_SECTION');
Then see in the token table what tokens are in the index:
select token_text from dr$alldocs_ctx$i;
If you got also an ORA-3113 see in alert.log if there is a trace
referenced with this error and have a look in this file to find a
better error message.
Good luck.
Thomas