Calling a backend JOB in oracle express

Question

Hello,
I have oracle 10g Express installed, which is working fine.
I have created a backend database job to update an index automatically every time a change is made to the require table.
Code is:-
DECLARE
X NUMBER;
BEGIN
SYS.DBMS_JOB.SUBMIT
( job => X
,what => 'EXECUTE IMMEDIATE ''alter index approvals_index1 rebuild online parameters (''''sync memory 45M'''')'';
EXECUTE IMMEDIATE ''alter index my_index1 rebuild online parameters (''''sync memory 45M'''')'';'
,next_date => to_date('01/01/4000 00:00:00','dd/mm/yyyy hh24:mi:ss')
,interval => 'to_date(''01/01/4000 00:00:00'',''dd/mm/yyyy hh24:mi:ss'')'
,no_parse => TRUE
SYS.DBMS_OUTPUT.PUT_LINE('Job Number is: ' || to_char(x));
END;
commit;
I am then using a pl/sql function in my app on the create / update page of the table in question as follows:-
dbms_job.run(79);
Job 79 being the code above.
This returns an error saying job cannot complete.
This will not run in my installation, but it works in my work instance which is 10g with apex 2.2 installed on top.
Why is this? and how do i get around the problem ?
Many Thanks To All
Rob

Answer 1

Clarification: this is a text index.
You need to resync it rather than rebuild it: http://download-uk.oracle.com/docs/cd/B19306_01/text.102/b14217/quicktour.htm#sthref78.
You probably need to schedule the job. Alternative approaches are to run the job at short intervals anyway (AskTom runs it every few minutes - see first answer on http://asktom.oracle.com/pls/ask/f?p=4950:8:3528069288840489084::NO::F4950_P8_DISPLAYID,F4950_P8_CRITERIA:37336837188020), or to run CTX_DDL.SYNC_INDEX as part of your submit process.