Suggestion: Oracle text CONTEXT index on one or more columns ?

Hi,
I'm implementing Oracle text using CONTEXT ..... and would like to ask you for performance suggestion ...
I have a table of Articles .... with columns .. TITLE, SUBTITLE , BODY ...
Now is it better from performance point of view to move all three columns into one dummy column ... with name like FULLTEXT ... and put index on this single column,
and then use CONTAINS(FULLTEXT,'...')>0
Or is it almost the same for oracle if i put indexes on all three columns and then call:
CONTAINS(TITLE,'...')>0 OR CONTAINS(SUBTITLE,'...')>0 OR CONTAINS(BODY,'...')>0
I actually don't care if the result is a match in TITLE OR SUBTITLE OR BODY ....
So if i move into some FULLTEXT column, then i have duplicate data in a article row ... but if i create indexes for each column, than oracle has 2x more to index,optimize and search ... am I wright ?
Table has 1.8mil records ...
Thank you.
Kris

mackrispi wrote:
Now is it better from performance point of view to move all three columns into one dummy column ... with name like FULLTEXT ... and put index on this single column,
and then use CONTAINS(FULLTEXT,'...')>0What version of Oracle are you on? If 11 then you could use a virtual column to do this, otherwise you'd have to write code to maintain the column which can get messy.
mackrispi wrote:
Or is it almost the same for oracle if i put indexes on all three columns and then call:
CONTAINS(TITLE,'...')>0 OR CONTAINS(SUBTITLE,'...')>0 OR CONTAINS(BODY,'...')>0Benchmark it and find out :)
Another option would be something like this.
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:9455353124561
Were i you, i would try out those 3 approaches and see which meet your performance requirements and weigh that with the ease of implementation and administration.

Similar Messages

ORACLE TEXT Context index so big, why ?

Hi,
One year ago, I've created a context index, for a table that had 2 million rows , and the context index was around 2.8 Mil rows ....
Today we have 2.9mil rows but the Context index has 95 Mil rows ??
Last weekend I did a FULL optimize index and it took 28hours and it was still not finished .... so this weekend I droped the index and re-created
it .... it took 6 hours ....
Now I started CTX_REPORT.INDEX_STATS to see how it looks like .... cause I exprected 95mil to become like 3.5mil max not more ....
Can anyone please tell me what should I check to see why did this happen so that the last 900.000 records created 91 mil rows in index ?
If there would be something wrong, why would the last 900.000 rows create something that prev 2mil rows did not ...
HEre is index creation :
CREATE INDEX ART_IDX ON MS_ARTICLE(ORATEXT) INDEXTYPE IS CTXSYS.CONTEXT FILTER BY ID,ART_DATE,MEDIA_CODE ORDER BY
ART_DATE DESC PARAMETERS (' LEXER ART_LEX STOPLIST CTXSYS.EMPTY_STOPLIST sync(ON COMMIT) DATASTORE DS_ART');If anyone needs definition of lexer od datastore, then please tell me what do I have to do to get definitions of that.
Thank you.
KRis

Hi,
Ok there must be something I did wrong .... cause after running INDEX_STATS ...I got this results :
===========================================
                    STATISTICS FOR "PRESCLIP"."ART_IDX"
===========================================
indexed documents:                                              2,876,228
allocated docids:                                               2,876,228
$I rows:                                                       96,110,561
                             TOKEN STATISTICS
unique tokens:                                                  5,584,188
average $I rows per token:                                          17.21
tokens with most $I rows:
JE (0:TEXT)                                                      11,650
V (0:TEXT)                                                       11,183
IN (0:TEXT)                                                      10,085So I have expected Average rows per token to be 1 after droping and re-creating index ..... so what else must I do to get the number 96mil to 5.5mil ?
Thank you.
Kris

Oracle Text Context index keeps growing. Optimize seems not to be working

Hi,
In my application I needed to search through many varchar columns from differents tables.
So I created a materialized view in which I concatenate those columns, since they exceed the 4000 characters I merged them concatenating the columns with the TO_CLOBS(column1) || TO_CLOB(column)... || TO_CLOB(columnN).
The query is complex, so the refresh is complete on demand for the view. We refresh it every 2 minutes.
The CONTEXT index is created with the sync on commit parameter.
The index then is synchronized every two minutes.
But when we run the optimize index it does not defrag the index. So it keeps growing.
Any idea ?
Thanks, and sorry for my poor english.
Edited by: detryo on 14-mar-2011 11:06

What are you using to determine that the index is fragmented? Can you post a reproducible test case? Please see my test of what you described below, showing that the optimization does defragment the index.
SCOTT@orcl_11gR2> -- table:
SCOTT@orcl_11gR2> create table test_tab
2    (col1 varchar2 (10),
3      col2 varchar2 (10))
4 /
Table created.
SCOTT@orcl_11gR2> -- materialized view:
SCOTT@orcl_11gR2> create materialized view test_mv3
2 as
3 select to_clob (col1) || to_clob (col2) clob_col
4 from   test_tab
5 /
Materialized view created.
SCOTT@orcl_11gR2> -- index with sync(on commit):
SCOTT@orcl_11gR2> create index test_idx
2 on test_mv3 (clob_col)
3 indextype is ctxsys.context
4 parameters ('sync (on commit)')
5 /
Index created.
SCOTT@orcl_11gR2> -- inserts, commits, refreshes:
SCOTT@orcl_11gR2> insert into test_tab values ('a', 'b')
2 /
1 row created.
SCOTT@orcl_11gR2> commit
2 /
Commit complete.
SCOTT@orcl_11gR2> exec dbms_mview.refresh ('TEST_MV3')
PL/SQL procedure successfully completed.
SCOTT@orcl_11gR2> insert into test_tab values ('c a', 'b d')
2 /
1 row created.
SCOTT@orcl_11gR2> commit
2 /
Commit complete.
SCOTT@orcl_11gR2> exec dbms_mview.refresh ('TEST_MV3')
PL/SQL procedure successfully completed.
SCOTT@orcl_11gR2> -- query works:
SCOTT@orcl_11gR2> select * from test_mv3
2 where contains (clob_col, 'ab') > 0
3 /
CLOB_COL
ab
c ab d
2 rows selected.
SCOTT@orcl_11gR2> -- fragmented index:
SCOTT@orcl_11gR2> column token_text format a15
SCOTT@orcl_11gR2> select token_text, token_first, token_last, token_count
2 from   dr$test_idx$i
3 /
TOKEN_TEXT      TOKEN_FIRST TOKEN_LAST TOKEN_COUNT
AB                        1          1           1
AB                        2          3           2
C                         3          3           1
3 rows selected.
SCOTT@orcl_11gR2> -- optimizatino:
SCOTT@orcl_11gR2> exec ctx_ddl.optimize_index ('TEST_IDX', 'REBUILD')
PL/SQL procedure successfully completed.
SCOTT@orcl_11gR2> -- defragmented index after optimization:
SCOTT@orcl_11gR2> select token_text, token_first, token_last, token_count
2 from   dr$test_idx$i
3 /
TOKEN_TEXT      TOKEN_FIRST TOKEN_LAST TOKEN_COUNT
AB                        2          3           2
C                         3          3           1
2 rows selected.
SCOTT@orcl_11gR2>

Rikaichan (add-on) doesn't work at my office. It gives this error "Javascript application: the index for one or more dictionaries needs to be created. This may take a while on slower computers". And then the PC freezes. What should I do?

I'm using Firefox 3.6.17, and have installed Rikaichan 2.02. Once I've installed the Japanese-English dictionary, I then click on Rikaichan to get it started, and it always gives a "Javascript Application" error:
'''"The index for one or more dictionaries needs to be created. This may take a while on slower computers"'''
Rikaichan always works fine on my laptop, but I just can't seem to install it properly at work. Is there some sort of office security screwing it up?

venicespent,
Boot into your Mavericks Recovery partition by hold down the command and R keys whilst booting. You'll see a screen that looks like this:
Click on the Disk Utility item to open Disk Utility. You should see your boot drive (usually named "Macintosh HD" unless you've changed it) in the column on the left of the screen. Select your boot partition and click on the "Verify" button. Let your Mac do it's thing - if you get green text telling you that everything seems to be OK, then your disk should not be damaged. If, however, you get red text telling you that the disk needs to be repaired, click on the "Repair" button. If the disk can be repaired, you should be good to go. If the disk cannot be repaired then the drive is damaged.
But before you do anything, make certain that you have backups!!!
Clinton
MacBook Pro (15-inch Late 2011), OS Mavericks 10.9.4, 16GB RAM, 960GB SSD, 27” Apple Thunderbolt Display

SSIS Error Text was truncated or one or more characters had no match in the target code page

I the same issue or something close.
Except I have one Field (27) that get a trunacation error
Error:
Data conversion failed. The data conversion for column "Column 27" returned status value 4 and status text "Text was truncated or one or more characters had no match in the target code page.".
The "output column "Column 27" (91)" failed because truncation occurred, and the truncation row disposition on "output column "Column 27" (91)" specifies failure on truncation. A truncation error occurred on the specified object of the specified component.
Data looks like:Red Text is the field that is throwing the error!
00000412,
0000000011411001,
0273508793,
01,
"RUTH           ",
"EDWARDS             ",
19500415,20080401,
"N",
04488013,
"1",
"F",
365094,
20080401,
000472162716,
"1447203880    ",
43995202341210,
00120.000,
0010,
00008.26,
00004.96,
000.00,
00002.70,
00007.66,
0,
"PROMETH/COD SYP 6.25-10 ",
"Y",
"Promethazine w/ Codeine Syrup 6.25-10 MG/5ML               ",
0000,
"001C",
610020,"WELLP1537",
"O",
"N",
00,
"D",
"S",
"G",
"ID01V012008782",
"TOM AHL CHRYSLER              ",
"M",
"M",
"PBD $20/10+40%/20%            ",
00008.26,
"1184641367"

I have found four things that I always check when I run into this problem. I have yet to find a time when one of these didn't work (specifically helps when reading data from flat files but I suppose most of the four would apply to any source). Check out my blog post, content repeated below:
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Caution: If you do set the "Flat File Source" to "RD_IgnoreFailure" as mentioned above, always take time to review the data loaded in the target table to ensure that the integrity of the data was not jeopardized.
Note: I have found that when the "DataType" for both the "External Columns" and "Output Columns" is manually updated that it does not remain the same when the advanced editor is reopened. For this reason, try Steps 1 and 2 before setting the "Output Columns" manually.
4. The last thing to try, and this applies specifically to loading data from Excel files as opposed to text or CSV is to set the package to run in 32-bit mode. Click on "Project" on the top menu and select "Data Imports Properties...". Click on "Debugging" under the "Configuration Properties" and set the "Run64BitRuntime" to "False".
Working with data from flat files can sometimes be difficult in SSIS. By using one or many of the approaches I have listed above you should be able to create a repeatable process that is frequently needed within most SSIS packages. Be very careful when setting data types within SSIS and make sure to do it upfront when necessary because it can be harder to debug later in the development process. If the proper changes are made it should not be a surprise to feel a big SSIS developer sense of relief when the screen shows all green.
Let me know if this works!
Check out my blog!

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Hello everyone,
SQL server 2012, SSIS package, we are getting the following error for some of the mapped columns,
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We're fetching the data from CSV file and dumping that to staging table i.e. SQL server 2012.
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Thanks, <b>Ankit Shah</b> <hr> Inkey Solutions, India. <hr> Microsoft Certified Business Management Solutions Professionals <hr> http://ankit.inkeysolutions.com

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web: www.ronnierahman.com

The workflow could not update the item, possibly because one or more columns for the item require a different type of information. Outcome: Unknown Error

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Hi,
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Stunpals - Disclaimer: This posting is provided "AS IS" with no warranties.

Oracle Text, create index (indextype is ctxsys.context)

Dear sirs,
I am a new user of Oracle Text (Oracle 11g release 11.2) and I am unable to create an index of type ctxsys.context). Any suggestions?:
code:
drop table mytable;
drop index myindex force;
create table mytable(id number primary key, docs clob);
insert into mytable values(111555,'this text will be indexed');
insert into mytable values(111556,'this is a default datastore example');
commit;
create index myindex on mytable(docs)
indextype is ctxsys.context
parameters ('DATASTORE CTXSYS.DEFAULT_DATASTORE');
+++++++
error messages:
create index myindex on mytable(docs)
ERROR at line 1:
ORA-29855: error occurred in the execution of ODCIINDEXCREATE routine
ORA-20000: Oracle Text error:
ORA-06508: PL/SQL: could not find program unit being called
ORA-06512: at "CTXSYS.DRUE", line 160
ORA-06512: at "CTXSYS.TEXTINDEXMETHODS", line 366

Please check for invalid objects. Log on as sys or system and run:
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Post the results here and we'll advise the next step.
If any objects owned by CTXSYS are invalid you may need to recompile the CTXSYS schema.

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I have Oracle Server(Express) installed on a Windows server.
I would like for Oracle to build a Full-Text Catalog of the files on a separate file server based on file paths in a table in the database.
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I can get Oracle text up and running, using the URL_Datastore:
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File_Datastore worked fine.
I was staying away from File_Datastore because the information I gathered from googling suggested that file_datastore would only work locally.
Now I just have to get Oracle to pull data out of tables in a MS-SQL database on the local network (don't have a clue yet), and then have it index compiled file paths.
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Hi Experts,
I am on Oracle on 11.2.0.2 on Linux. I have implemented Oracle Text. My Oracle Text indexes are fragmented but I am getting an error while running the optimize_index error. Following is the error:
begin
ctx_ddl.optimize_index(idx_name=>'ACCESS_T1',optlevel=>'FULL');
end;
ERROR at line 1:
ORA-20000: Oracle Text error:
ORA-06512: at "CTXSYS.DRUE", line 160
ORA-06512: at "CTXSYS.CTX_DDL", line 941
ORA-06512: at line 1
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ctx_ddl.optimize_index(idx_name=>'BVSCH1.ACCESS_T1',optlevel=>'FULL');
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ORA-06512: at "CTXSYS.DRUE", line 160
ORA-06512: at "CTXSYS.CTX_DDL", line 941
ORA-06512: at line 1
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How about check the following?
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Oracle Text ALTER INDEX Performance

Greetings,
We have encountered some ehancement issues with Oracle Text and really need assistance.
We are using Oracle 9i (Release 9.0.1) Standard Edition
We are using a very simple Oracle text environmet, with CTXSYS.CONTEXT indextype on Domain Indexes.
We have indexed two text columns in one table, one of these columns is CLOB.
Currently if one of these columns is modified, we are using a trigger to automatically ALTER the index.
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Is this right? should it be this slow?
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How can we enable it?
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Would using a trigger be the best way to do this?
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If you are going to sync your index on every update, you need to make sure that you are optmizing it on a regular basis to remove index fragmentation and remove deleted rows.
you can set up a dmbs_job to do a ctx_ddl.optmize and run a full optmize periodically.
Also, depending on the number of rows you have, and also the size of the data, you might want to look at using a CTXCAT index, which is transactional, stays in sync automatically and does not need to be optimized. CTXCAT indexes do not work well on large text objects (they are good for a couple lines of text at most) so they may not suit your dataset.

APEX app using Oracle Text to index pages that require authorzation

Hi Gurus and APEX Dev team
My team need to develop an APEX App that will index all our documents spread across various servers. Some of the documents require Single sign on access (e.g. KIX.oraclecorp.com) and some require other authorization methods (e.g. Metalink) . The Question is , Is it possible to index the pages that require authorization using Oracle text. If yes How? I have implemented the demo app which can index pages that do not require authorization.
Thanks a million
regards
Bala

Hello,
Unless I misunderstand you, the fact that the pages require authentication doesn't really matter, it is the underlying data you want to index correct? If so then you would index them in exactly the same way that you would index any table data using Oracle Text/interMedia.
John.
Blog: http://jes.blogs.shellprompt.net
Work: http://www.apex-evangelists.com
Author of Pro Application Express: http://tinyurl.com/3gu7cd
REWARDS: Please remember to mark helpful or correct posts on the forum, not just for my answers but for everyone!

Ctxsys.context index on registered schema xmltype column

9iR2
Is it possible to create a text index (indextype is ctxsys.context) on a schema registered xmltype column?
I tried it, the index creation works fine.
After the first insert statement the Oracle process seems to hang. (CPU 100%, increasing memory consumption)

Yes, I previously entered some data.
Test case:
1. register schema
begin
DBMS_XMLSCHEMA.REGISTERSCHEMA('http://localhost/JobPositionSeeker-1_1.xsd',
getDocument('JobPositionSeeker-1_1.xsd'), TRUE, TRUE, FALSE, FALSE
end;
2. create table
CREATE TABLE application_xml of XMLType
XMLSCHEMA "http://localhost/JobPositionSeeker-1_1.xsd" ELEMENT "JobPositionSeeker"
3. entered some data
4. created the index
create index applicant on application_xml ( SYS_NC_ROWINFO$)
indextype is ctxsys.context
5. select using index
select value(a).getClobVal() from application_xml a
where contains( value(a),'%ai% INPATH(//PersonalData/PersonName/FamilyName)')>0
6. insert another record
-> crash

Change display of result set from 'showing data as rows, to showing data as one or more columns'

Hi Everyone,
I am interested in changing the way that data is displayed in my result set.
Essentially I want to display a selection of rows (1 to n) as columns, the following diagram explains my intentions -
Perhaps one of the greatest challenges here is the fact that I do not have a concrete number of rows (or BIN numbers).
Each stock item could be stored in one or more BINS, which I will not know until running my query.
Any suggestions here will be greatly appreciated.
Kind Regards,
David

Can you explain on what basis you select those BinLabels? There're lots of other labels also available on your sample data so whats the rule which determines which all BinLabels should be selected?
Please Mark This As Answer if it helps to solve the issue Visakh ---------------------------- http://visakhm.blogspot.com/ https://www.facebook.com/VmBlogs
Agree with Visakh16's opinion. In addition, it might be helpful if you can post your DDL here.
Regards,
Elvis Long
TechNet Community Support

Suggestion: Oracle text CONTEXT index on one or more columns ?

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