APEX Training

Thursday, 19 March 2009

Using Oracle Text with Table Data

Using LIKE clause with large tables may be a serious performance problem, involving full table scans for even a very small result set. The time you need to get a result will increase tremendously. Using Oracle Text may help you overcome those issues. In this simple example in my Demo Application I am showing how to start using Oracle Text on a table. There are also many other features included with Oracle Text such as preferred terms, fuzzy searches, highlighting, and much more. All explained in Oracle Text Documentation. Try it out.



25 comments:

JohnA said...

How can I tell if I have oracle text installed?

Denes Kubicek said...

John,

Oracle Text should be there by default. Check if there is CTXSYS User. If not, then either the database has been upgraded from an early version where it was not a default, or someone has removed it.

Denes Kubicek

Saima said...

Hello There...
I am using Oracle 9i and logged in by SCOTT schema is EMP, I've used your code script as it is.. but got this error message

ORA-20000 :Oracle Text Error
DRG-12607: Only CTXSYS can create Multi-Column preferences

Is your script is complete?? Please need further help.Thanks

Denes Kubicek said...

The step by step explanation says:

"GRANT EXECUTE ON ctx_ddl TO schema_name;"

Have you done that part?

Denes Kubicek

Saima said...

Really thanks for your urgent Reply!
Yes have tried... and got thir error message

ORA-04042: Procedure,function,package,or package body does not exist


Again thanks and Regrads...

Saima said...

Hello
Now have successfully granted.
Now in my Enterprise Manager of Oracle 9i I can view object of my schema scott as
GRANTED
Priviliege | Schema | Object
EXECUTE | CTXSYS | CTX_DDL

But facing the same problem of that erroe have earlier posted to you.
Please help if you can,
Thanks and Best Regards

Sruthi said...

Hi,

The demo doen't work now. Also, you haven't mentioned how the search text is highlighted? Could you please explain that?

Thanks,

Denes Kubicek said...

The demo works now. Someone must have deleted the indexes. Highlighting is standard apex highlighting.

Denes Kubicek

Emmanuel said...

It can index a blob field or should I do differently?

Because I did it like you explain but just wanted varchar fields and not by the content of the blob field

which is my fault?

Denes Kubicek said...

I don't understand what you are asking.

Denes Kubicek

Emmanuel said...

as index a blob field?

examples: .pdf, .docx, .txt...
I need to seek within content

Denes Kubicek said...

O.K. now I understand. See this example:

http://apex.oracle.com/pls/otn/f?p=31517:76

Denes Kubicek

Emmanuel said...

Denes thanks is what I needed!
I will try and tell you!!

Emmanuel said...

Hi, Denes!
There are problems with indexing versions .pdf or .docx ??

Denes Kubicek said...

Are you using 11g database?

Denes Kubicek

Emmanuel said...

Yes, Oracle 11g.

Denes Kubicek said...

I had the same problem with 11g and I asked for a solution here:

http://forums.oracle.com/forums/message.jspa?messageID=4044126#4044126

Never had a chance to try the tips. You may give it a shot.

Denes Kubicek

Emmanuel said...

is wonderful! It worked for. Pdf but not for. Docx
Anyway it's great. Thank you very much!!

Denes Kubicek said...

O.K. What worked?

Denes Kubicek

Emmanuel said...

as you say?

Denes Kubicek said...

My question was:

Was it this part:

"I have found that, although it should not make a difference, sometimes it helps to explicitly declare the filter in your parameters when creating the index:"

?

Denes Kubicek

Emmanuel said...

Yes!
that part is it works:
...FILTER TXSYS.AUTO_FILTER...



but the documents .docx not indexed

Denes Kubicek said...

Does it index .doc files or .xls?

Denes Kubicek

Emmanuel said...

- Document generated by Office Word 2007 with extension .docx are not indexed.

- Document generated by Office Word 2003 if they are indexed.

- Document generated by Office Excel 2003 with extension .xls if they are indexed but not displayed for ctx_doc.snippet.

Document generated by Office Excel 2007 with extension .xlsx are not indexed.

Denes Kubicek said...

O.K. thanks for checking. So only .docx and .xlsx are not indexed?

Denes Kubicek