ORACLE TEXT INDEX ON COLUMN VARCHAR2

Hi all
I find a search in our application very slow so I thought using ORACLE TEXT CTXCAT index based search but I find some inconsistencies. How can this be avoided... The following query should not return if I can replace with the text of the oracle, but I find few values... why result... I also gave some results of the sample below...

SELECT first_name
Of uc_partner_ms
WHERE
Upper (first_name) LIKE '% WIE % '.
less
SELECT first_name
Of uc_partner_ms
WHERE CATSEARCH (name,'* wie *', null) > 0

RESULTS...

Hans-Werner Mrowiec
Heinz Oesterwiemann GmbH
Helmut Froitzheim GmbH, Neuwied
Heribert Schwies
Hermann Twieling GmbH & Co. KG
Breitwieser Horst
Horst-Dieter Swie

The script used to create indexes is

Start
ctx_ddl.create_preference ('mylex', 'BASIC_LEXER');
ctx_ddl.set_attribute ('mylex', 'index_themes', 'NO');
ctx_ddl.set_attribute ('mylex', 'mixed_case', 'NO');
end;

CREATE INDEX partner_index ON uc_partner_ms (first name)
INDEXTYPE IS CTXSYS. CTXCAT
parameters ('mylex LEXER');


Where am I wrong that I couldn't guess a trend in the other that all results be lowercase...

(1) what is the difference tag brings in the query?

This is the QUERY MODEL, which allows you to use the CONTEXT GRAMMAR on the CTXCAT index, as if you were using CONTAINS. There are examples in the documentation here:

http://download.Oracle.com/docs/CD/B19306_01/text.102/b14218/csql.htm#i1000002

(2) is it a good idea to replace catsearch for like operator leader %?

The wildcard character for a CATSEARCH operator on a CTXCAT index is the asterisk. The wildcard character for an operator CONTAINS a CONTEXT index is a percent sign. CATSEARCH does not support major wildcards, you can use a word followed by an asterisk, but not preceded by an asterisk. The percent sign is not a valid wildcard with CATSEARCH. However, when you use the query template and specify GRAMMAR = "CONTEXT". Then, it's as if you were using a CONTAINS operator with a CONTEXT index, so you can use a wildcard of beginning and the % sign is the wildcard character. You can use AS with signs of percentage before and after, but it is likely to be very slow, because it cannot use an index. If the main characters using generic is going to be a frequent requirement, then you would probably be better with a hint of CONTEXT with a BASIC_WORDLIST valued SUBSTRING_INDEX true for optimal speed.

(3) also, I read in 10 g, the maximum number of rows returned is only 15000. is this true?

N ° you probably read about the WILDCARD_MAXTERMS of 15,000 in 10 g limit. This is the maximum number of separate tokens (not lines) that can match a wildcard character without producing an error. In 11g the maximum is 50,000. The default values are lower. If you want to allow a large number of generic searches that match a large number of chips, then you probably assign the WILDCARD_MAXTERMS the most. However, there will always be some queries that are too general, you should plan to trap the error and returns a comprehensible message to your user, asking them that their search is too broad and to enter a value for more specific search.

Tags: Database

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    3 (i_OpenSearchText-online 1000345, 342345, laptop, 123, SDILK143',)

    4 o_result =>: g_ref);

    5 END;

    6.

    PL/SQL procedure successfully completed.

    Scott@orcl12c > g_ref PRINT

    ORDER_NUMBER CUSTOMER_NUM GENERIC_PRODUCT_NAME_EXT ENTITLEMENT_REF DEVICE_ASSET_ID S

    --------------- --------------- ------------------------- --------------- --------------- -

    1000345 342345 123 SDILK143 laptop

    1 selected line.

    Scott@orcl12c > START

    2 prc_open_search

    3 (i_OpenSearchText-online '1000345',

    4 o_result =>: g_ref);

    5 END;

    6.

    PL/SQL procedure successfully completed.

    Scott@orcl12c > g_ref PRINT

    ORDER_NUMBER CUSTOMER_NUM GENERIC_PRODUCT_NAME_EXT ENTITLEMENT_REF DEVICE_ASSET_ID S

    --------------- --------------- ------------------------- --------------- --------------- -

    1000345 342345 123 SDILK143 laptop

    1000345 543243 portable 321 341KLIDS

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  • The text index can do for me?

    Hi all

    I have the following question to und of the oracle text index requirements:
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INSERT INTO t1 (STR)
VALUES ('Abcd');

INSERT INTO t1 (STR)
VALUES ('abcd');

INSERT INTO t1 (STR)
VALUES ('Aabcd');

INSERT INTO t1 (STR)
VALUES ('Abcd-ef');

INSERT INTO t1 (STR)
VALUES ('Abcd ef');

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INSERT INTO t1 (STR)
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INSERT INTO t1 (STR)
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INSERT INTO t1 (STR)
VALUES ('Abcdij');

INSERT INTO t1 (STR)
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COMMIT;
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  CTX_DDL.SET_ATTRIBUTE('SUBSTR_PREF','SUBSTRING_INDEX','TRUE');

  CTX_DDL.CREATE_PREFERENCE('pj_lex', 'BASIC_LEXER');
  CTX_DDL.SET_ATTRIBUTE('pj_lex', 'PRINTJOINS', '-');
  
  CTX_DDL.CREATE_PREFERENCE('mcds_t1_str', 'MULTI_COLUMN_DATASTORE');
  CTX_DDL.SET_ATTRIBUTE('mcds_t1_str', 'COLUMNS', '''XZX''||STR');
END;
/

CREATE INDEX IDX_T1_STR ON T1
(STR)
INDEXTYPE IS CTXSYS.CONTEXT
PARAMETERS('wordlist  SUBSTRING_PREF
            LEXER     pj_lex
            DATASTORE mcds_t1_str
            memory    50m')
NOPARALLEL;
    My requirements are: when I look for "abcd" (WHERE contains (STR, "Frederick" |: var1 |)) » %') > 0) :
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    Concerning

    S Max wrote:
    Hi, thanks!
    Is it possible to the value ' * ' as PRINTJOINS and SKIPJOINS?

    Of course, everything is in the base lexer:

    INSERT INTO t1 (STR)
VALUES ('Abcd*ef');

BEGIN
  CTX_DDL.DROP_PREFERENCE('SUBSTR_PREF');
  CTX_DDL.DROP_PREFERENCE('pj_lex');
end;

drop INDEX IDX_T1_STR

CREATE INDEX IDX_T1_STR ON T1
(STR)
INDEXTYPE IS CTXSYS.CONTEXT

select *
from t1
where
contains (str,'abcd') > 0

STR
Abcd ef
Abcd
abcd
Abcd-ef
Abcd - ef
Abcd - 12
Abcd_ef12
Abcd*ef

    But you don't do this with XYZ as a prefix and a wild card.

  • Performance issues and options to reduce the loading with the Oracle text implementation

    Hi Experts,

    My database on Oracle 11.2.0.2 on Linux. We have Oracle implemented for the fuzzy search. Our oracle text indexes are defined as sync on commit that we cannot afford to have stale data.  Now our application done literally thousands of inserts/modifications/deletions of these columns where we have these Oracle text index defined. Thus, we see a significant impact on performance because the oracle text synchronization routines is called on each commit. We do nightly index optimization (optimization full every night at 3:00).  The text index oracle internal operations are appearing at the top of the sql page in our AWR report and fears it causes a lot of load on the DB.  Since we do optimization of the complete index once during the night, I think I should change that, and if I do, he's going to help us?

    For example, here are some data of AWR report my one day:

    Time elapsed (s) Executions Time by Exec (s) % Total % CPU %IO SQL ID SQL module SQL text
    27,386.25305 4410.0916.5015.829.98ddr8uck5s5kp3Start ctxsys.drvdml.com_sync_i...
    14,618.81213 9800.078.818.3927.7902yb6k216ntqfbegin ctxsys.syncrn (: idxownid,...)


    More top sql full text:

    ddr8uck5s5kp3begin ctxsys.drvdml.com_sync_index (: idxname,: idxmem,: partname);
    end
    02yb6k216ntqf

    begin ctxsys.syncrn (: idxownid,: idxoname,: idxid,: ixpid,: rtabnm,: flg); end;

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    Thank you

    OrauserN

    It's to you which values you want to experiment.  Since 1 G, which is the same as 1024M is the maximum I could try that assigning to an index and see what effect it has.  You can use the same AWR report that you used previously and compare performance.  To determine when paging depends on your operating system and what tools you have.  Another option might be to use TRANSACTIONAL, that allows searching for unsynchronized lines and allow you to synchronize every five minutes, like Herald suggested, without any latency problem.  You can read about it here (scroll down to transaction):

    http://docs.Oracle.com/CD/E11882_01/text.112/e24436/csql.htm#CCREF23731

  • Oracle Text multi column index based query returns no rows

    Hello

    I have a MAH_KERESES_MV table with 3 columns OBJEKTUM_NEV, KERESES_SZOVEG_1, KERESES_SZOVEG_2. I create the following Oracle multi column text index:

    ctx_ddl.create_preference exec ('MAH_SEARCH', 'MULTI_COLUMN_DATASTORE');
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    SELECT id, OBJEKTUM_NEV
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    Can some body please help? TIA,

    Tamas

    You can do it in Oracle Text, well it is not necessarily desirable.

    You can search the

    WHERE CONTAINS(OBJEKTUM_NEV, '%C%')>0;

    And it will probably work in a simple test. However, using a leader like this wildcard prevents them the index on the table "list of words" used, so such a request can be very slow on a large system.
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  • Text Oracle (type index CTXCAT) index does not not with wild-card leader

    Hi Experts,

    We are on Oracle 11.2.0.2 on Solaris 10 and I implemented the Oracle text as in the example below:
    CREATE TABLE TEST_USER
(
  FIRST_NAME  VARCHAR2(64 CHAR)                 NOT NULL,
  LAST_NAME   VARCHAR2(64 CHAR)                 NOT NULL
);


CREATE INDEX TEST_USER_IDX3 ON TEST_USER
(FIRST_NAME)
INDEXTYPE IS CTXSYS.CTXCAT
PARAMETERS('LEXER cust_lexer');


CREATE INDEX TEST_USER_IDX4 ON TEST_USER
(LAST_NAME)
INDEXTYPE IS CTXSYS.CTXCAT
PARAMETERS('LEXER cust_lexer');

Dont worry about the cust_lexer, it is for diacritical search and it is not relevant to this question so I am not copying the code for the preference I created etc.
Now I have a row of data in the table with first_name column as Supervisor. If I run the below sql, it gives output:

SELECT *
  FROM test_user
 WHERE catsearch (first_name, 'Supervisor', NULL) > 0;

FIRST_NAME                     LAST_NAME
------------------------------ ------------------------------
Supervisor                     upervisor

--even the below sql with wild card (*) at the end works fine...
SQL> SELECT *
  2    FROM test_user
  3   WHERE catsearch (first_name, 'Super*', NULL) > 0;

FIRST_NAME                     LAST_NAME
------------------------------ ------------------------------
Supervisor                     upervisor


However the below sql queries doesn't give any output, though they should return the same row as above!

SQL> SELECT *
  2    FROM test_user
  3   WHERE catsearch (first_name, '*visor', NULL) > 0;

no rows selected


SQL> SELECT *
  2    FROM test_user
  3   WHERE catsearch (first_name, '*vis*', NULL) > 0;

no rows selected
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    Thank you

    Published by: orausern on January 16, 2013 10:59

    Published by: orausern on 16 January 2013 11:00

    Published by: orausern on 16 January 2013 11:07

    When you create a ctxcat index, it creates different tables index field. You can query like this:

    select dr$token from dr$TEST_USER_IDX3$i;

    ... to see which tokens are created by the indexing. In your case, I think that you will find just the word 'controller' in the name, is that you can go. This documentation gives to think than catsearch and wildcards don't mix, unless you use the query template feature.

    I'm more familiar with CTXSYS. CONTEXT clues, though:

    drop index TEST_USER_IDX3;

SQL> CREATE INDEX TEST_USER_IDX3 ON TEST_USER
  2  (FIRST_NAME)
  3  INDEXTYPE IS CTXSYS.CONTEXT;

SQL> select * from test_user where contains (first_name, '%vis%')>0;

FIRST_NAME                                                       LAST_NAME
---------------------------------------------------------------- -----------
Supervisor                                                       Ubervisor

    Anyway, since I've linked the document, I think you might need to check the query patterns.

    There's a specific forum Oracle Text here, however, and if you can get Barbara Boehmer to read your question there, she'll probably have a definitive answer for you.

    PS: She may already have provided in Re: wildcard search, on which she stated that "since catsearch does not support wildcards left you need context...» ».

  • Text index CONTEXT Oracle which gives bad results!

    Expert Oracle Text,

    I'm on Oracle 11.2.0.2 on Solaris 10 and have implemented the Oracle text features using the CONTEXT index type, and I'm getting a few problems in. I have a need for research with joker as % and giving the wrong exit. Here's the scenario where I get incorrect results:
     

--creating preferences etc 
exec   ctxsys.ctx_ddl.create_preference ('cust_lexer', 'BASIC_LEXER'); 
exec   ctxsys.ctx_ddl.set_attribute ('cust_lexer', 'base_letter', 'YES'); -- removes diacritics 
exec   ctxsys.ctx_ddl.create_preference ('cust_wl', 'BASIC_WORDLIST') 
exec   ctxsys.ctx_ddl.set_attribute ;    ('cust_wl', 'SUBSTRING_INDEX', 'true'); 

--table set up 
CREATE TABLE TEST_USER 
( 
  FULL_NAME  VARCHAR2(64 CHAR)                  NOT NULL, 
  LAST_NAME  VARCHAR2(64 CHAR)                  NOT NULL 
); 


CREATE INDEX TEST_USER_IDX5 ON TEST_USER 
(FULL_NAME) 
INDEXTYPE IS CTXSYS.CONTEXT 
PARAMETERS('LEXER cust_lexer WORDLIST cust_wl SYNC (ON COMMIT)'); 

--data set up 
Insert into TEST_USER 
   (FULL_NAME, LAST_NAME) 
Values 
   ('Supervisor upervisor', 'upervisor'); 
Insert into TEST_USER 
   (FULL_NAME, LAST_NAME) 
Values 
   ('JOSEPH WILSON', 'WILSON'); 
Insert into TEST_USER 
   (FULL_NAME, LAST_NAME) 
Values 
   ('CHRISTOPHER Phil', 'TAYLOR'); 
Insert into TEST_USER 
   (FULL_NAME, LAST_NAME) 
Values 
   ('PAUL HERNANDEZ', 'HERNANDEZ'); 
Insert into TEST_USER 
   (FULL_NAME, LAST_NAME) 
Values 
   ('Betty Jipes', 'Jones'); 
Insert into TEST_USER 
   (FULL_NAME, LAST_NAME) 
Values 
   ('One Anna', 'Anna'); 
Insert into TEST_USER 
   (FULL_NAME, LAST_NAME) 
Values 
   ('Three Anna', 'Anna'); 
Insert into TEST_USER 
   (FULL_NAME, LAST_NAME) 
Values 
   ('Two Anna', 'Anna'); 
Insert into TEST_USER 
   (FULL_NAME, LAST_NAME) 
Values 
   ('Four Anna', 'Anna'); 
Insert into TEST_USER 
   (FULL_NAME, LAST_NAME) 
Values 
   ('Gary Barrow', 'Barrow'); 
COMMIT; 

--query using CONTAINS which gives WRONG output - because out intention is to return only those strings that START WITH the letter P but it returns another string that has P not at the starting!! 

SQL> select full_name from test_user where contains(full_name,'P%')>0; 

FULL_NAME 
---------------------------------------------------------------- 
PAUL HERNANDEZ 
CHRISTOPHER Phil 

-- I need output as follows in which the second value is not returned...meaning 'CHRISTOPHER Phil' should NOT be returned by the CONTAINS clause just as the LIKE operator below doesn't return it. 
SQL> select full_name from test_user where full_name like 'P%'; 

FULL_NAME 
---------------------------------------------------------------- 
PAUL HERNANDEZ
    Please can anyone suggest what to do about it?

    Thank you
    OrauserN

    No, you can skip all those, if you use SUBSTRING_INDEX.

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