Problem indexing Oracle text

Similar Questions

• Big problem with Oracle Text

  Hi all
  I use the Oracle text to perform a full text search. I have my column indexed like that
  
  CREATE INDEX cm_property_text ON cm_property (text_value) INDEXTYPES IS CTXSYS. FRAMEWORK
  
  After that, I inserted a line in the text_value field have contain is: "I and you or other ', then run the synchronous command my index finger:
  
  Begin
  CTXSYS. CTX_DLL. SYNC_INDEX ('cm_property_text');
  end;
  
  Then I run the query to select out have the text_value line contains text value is "I and you".
  
  SELECT * FROM cm_property WHERE CONTAINS (text_value,' I / you "")
  
  But I got nothing. And I tried to change like this looking for text entry
  
  SELECT * FROM cm_property WHERE CONTAINS (text_value, ' I/you and/or other "" ");
  
  And I had a line that is the line that I inserted before.
  
  I have really no why? Who can help me to explain about this?
  
  Thank you very much!

  If you want to be able to search for empty words by default, you can use an empty stopwords list or which does not contain the words you want to search. For a single character escape, preface with-not. To escape a whole word or phrase, such as a keyword or reserved word, surround it with {}. Please see the demo below.

  SCOTT@orcl_11gR2> CREATE TABLE cm_property
    2    (text_value  VARCHAR2 (60))
    3  /
  
  Table created.
  
  SCOTT@orcl_11gR2> CREATE INDEX cm_property_text
    2  ON cm_property (text_value)
    3  INDEXTYPE IS CTXSYS.CONTEXT
    4  PARAMETERS ('STOPLIST CTXSYS.EMPTY_STOPLIST')
    5  /
  
  Index created.
  
  SCOTT@orcl_11gR2> INSERT INTO cm_property (text_value)
    2  VALUES ('I and you or other')
    3  /
  
  1 row created.
  
  SCOTT@orcl_11gR2> Begin
    2    CTXSYS.CTX_DDL.SYNC_INDEX ('cm_property_text');
    3  end;
    4  /
  
  PL/SQL procedure successfully completed.
  
  SCOTT@orcl_11gR2> SELECT token_text FROM dr$cm_property_text$i
    2  /
  
  TOKEN_TEXT
  ----------------------------------------------------------------
  AND
  I
  OR
  OTHER
  YOU
  
  5 rows selected.
  
  SCOTT@orcl_11gR2> SELECT * FROM cm_property
    2  WHERE  CONTAINS (text_value, 'I {and} you') > 0
    3  /
  
  TEXT_VALUE
  ------------------------------------------------------------
  I and you or other
  
  1 row selected.
  
  SCOTT@orcl_11gR2> SELECT * FROM cm_property
    2  WHERE  CONTAINS (text_value, 'I {and} you {or} other') > 0
    3  /
  
  TEXT_VALUE
  ------------------------------------------------------------
  I and you or other
  
  1 row selected.
  
  SCOTT@orcl_11gR2>
  

• Oracle text index - unexpected behavior

  We have a SEARCH_TABLE (in Oracle 12.1.0.1.0) with a couple of files (actually about 10,000,000 records):

  ID ADDRESS

  1     | WIMPEL | 57. 9733BK | GRONINGEN |

  2     | JOHAN WILSSTRAAT | 7 ||| 1333PV | ALMERE |

  3     | ABRAHAM KUYPERHOF | 10. 8091XN | WEZEP |

  
  

  To support research on the table addresses, we apply an Oracle text index:

  create index ST_CTX1 on SEARCH_TABLE (address)

  indexType is ctxsys.context

  parameters ("DATASTORE CTXSYS. DEFAULT_DATASTORE');

  
  

  Our research focuses on whole words (without jokers). When searching through the data, it usually comes back with the correct results.

  
  

  SELECT THE ID

  OF SEARCH_TABLE

  WHERE CONTAINS (ADDRESS, 'GRÖNING') > 0

  ;

  Returns nothing, that is correct. Once the search argument 'GRÖNING' is replaced by 'GRONINGEN', ID 1 is correctly selected. According to this behavior, the following query returns no records:

  SELECT THE ID

  OF SEARCH_TABLE

  WHERE CONTAINS (ADDRESS, 'ABR & KUYPERHOF') > 0

  ;

  
  

  Surprisingly, however, the following query returns record ID 3:

  SELECT THE ID

  OF SEARCH_TABLE

  WHERE CONTAINS (ADDRESS, ' A & KUYPERHOF ') > 0

  ;

  (Even if data does not contain the complete word 'A'). This unexpected behavior only seems to occur when you use "A" as the initial character.

  The following query (with the search starting with the character 'J' argument) returns no data. Which is the expected behavior.

  SELECT the ID

  OF SEARCH_TABLE

  WHERE CONTAINS (ADDRESS, 'J & WILSSTRAAT') > 0

  ;

  Anyone has an idea why the text index returns with A situations? Any ideas on how to solve this problem are appreciated.

  Mark

  According to the list of empty words by default in 11.2, the letters a, d, i, s, and t are listed, so would be removed from the wanted list of tokens.  Thus, 'A & WILSSTRAAT' becomes '& WILSTRAAT' and search text line with a single word.  'j' is not an empty word, so it is considered to be a token is valid and is not in your tables.  Look in CTXSYS. CTX_STOPWORDS to see what you have.

• Oracle Text, multi_column_datastore describe index

  Referring to the Re: Oracle Text, ctxsys.context problem with column number
  
  TOAD or SQL Navigator, you can click on an object any (such as a table, index) and click on the "script" tab where the code is generated to create.
  
  Assuming that I am a person who sees the index for the first time where/how I can find multi_columns/settings with which the index has been created?
  
  For example:

  exec ctx_ddl.drop_preference( 'myds' );
  exec ctx_ddl.create_preference( 'myds', 'MULTI_COLUMN_DATASTORE' );
  exec ctx_ddl.set_attribute( 'myds', 'COLUMNS', 'item_barcode, item_title, item_subtitle' );
  CREATE INDEX i_index_test
     ON item (item_title)
     INDEXTYPE IS ctxsys.context
     PARAMETERS ( 'datastore myds' );

  And script says:
  

  CREATE INDEX PLSQL.I_INDEX_TEST ON PLSQL.ITEM
  (ITEM_TITLE)
  INDEXTYPE IS CTXSYS.CONTEXT
  PARAMETERS('datastore myds')
  NOPARALLEL;

  Where can I find datastore "myds"?

  You can use ctx_report to get information about an index.

  I use it for SQL * more like this:

  set pagesize 0
  set heading off
  set trimspool on
  set long 500000
  
  spool index.sql
  
  select ctx_report.create_index_script('MyIndexName') from dual;
  
  spool off
  

  The only thing it will not give you is the source for all of the procedures used in the user_datastore. You can get to user_sources.

• 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');
  ctx_ddl.set_attribute exec ('MAH_SEARCH', 'COLUMNS', 'OBJEKTUM_NEV, KERESES_SZOVEG_1, KERESES_SZOVEG_2');
  
  create index MAX_KERES_CTX on MAH_KERESES_MV (OBJEKTUM_NEV)
  indexType is ctxsys.context
  parameters ("DATASTORE MAH_SEARCH");
  But the query returns no rows, although if I make the query with the 'like' operator, and then I get the results as expected:
  
  SELECT id, OBJEKTUM_NEV
  OF MAH_KERESES_MV
  WHERE CONTAINS (OBJEKTUM_NEV, "C") > 0;
  
  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.
  You can improve this by using SUBSTRING_INDEX, but making your much bigger index. And you could always hit the 'expansions too' problem if %C % expansion is more than about 15,000 words (depending on version and different settings).

  Also be aware of differences in case - %C % will match 'fact' or 'FACT', as part of a CONTAINS, but not part of a TYPE.

• Problem with the Oracle text markup

  Hello
  
  I have a problem with the Oracle text markup.
  
  I am looking for keywords in a text which is composed by a question and answer.
  Here is the structure of my text:
  & lt; div class = 'question' & gt;
  & lt; a & gt; the title of my question & lt; /a & gt;
  & lt; div class = "reply & gt;
  content of response
  & lt; / div & gt;
  & lt; / div & gt;
  
  It is possible to search those keywords in the question or answer only. For this, I use the stored procedure:
  
  {call CTX_DOC. MARKUP)
  index_name = >?
  textkey = >?
  text_Query = >?
  restab = >?
  query_id = >?
  startTag = >?
  (EndTag = >?)}
  
  _with these parameters: _
  
  index_name = < my index >
  textkey = < id for the search text >
  text_Query = < a query containing the keywords >
  restab = < a table SQL to store the marked text >
  query_id = < id >
  startTag = ' < span class =-"highlight\" >. "
  EndTag = "</span >.
  
  The markup should be done only in the place you want (question, answer, or both).
  The markup is good when I search a keyword throughout the text, in the question or answer only.
  * If I search two key words in the question or answer, the markup is bad *.
  
  _Example: __
  I am looking for the words "* Internet *" in question only.
  Here's the query passed to the stored procedure:
  + * text_query * = 'service & internet' INPATH (//div[@class = 'question'] / has) +.
  
  In the question, these words are well marked.
  In response, only the first word is marked.
  
  * Why the first keyword is also marked in the response while the query specifies a search in question only? *
  
  The same problem appears when I search for the same keywords in the response only.
  In this case, in the answer, these words are marked as well.
  In the issue, only the first word is marked.
  
  Thanks for your help
  
  Edited by: user11088931 Apr 21. 2009 06:17

  Try text_query = (service & internet) INPATH (//div/a)

  Single quotes in a query do nothing. I think that your request has been treated as

  Service & (internet INPATH (//div/a))

• All parameter memory index for Oracle text indexes

  Hi Experts,

  I'm on Oracle 11.2.0.3 on Linux and have implemented Oracle Text. I'm not an expert in this area and need help on a question. I created the Oracle text index with the default setting. However, in a white paper of oracle, I read that the default setting is perhaps not good. Excerpt from the white paper by Roger Ford:

  URL:http://www.oracle.com/technetwork/database/enterprise-edition/index-maintenance-089308.html

  "(Part of this white paper below. )" ...)

  Index memory as mentioned above, $I entries cached emptied out on the disk each time the indexing memory is exhausted. The default index to installing memory is a simple 12MB, which is very low. At the time of creating indexes, users can specify up to 50 MB, but it is still quite low.                                   

  This would be by a CREATE INDEX, something like statement:

   CREATE INDEX myindex ON mytable(mycol) INDEXTYPE IS ctxsys.context PARAMETERS ('index memory 50M');  

  Allow index of the parameters of memory beyond 50 MB, the CTXSYS user must first of all increase the value of the MAX_INDEX_MEMORY parameter, like this:

   begin ctx_adm.set_parameter('max_index_memory', '500M'); end;  

  The parameter memory must never be high point causes paging, because this will have a serious effect on indexing speed. The smallest of dedicated systems, it is sometimes advantageous to temporarily reduce the amount of memory consumed by the Oracle SGA (for example by reducing DB_CACHE_SIZE and/or SHARED_POOL_SIZE) during the index creation process. Once the index has been created, the size of the SGA can be increased again to improve query performance. & quot;

  (End of the excerpt from the white paper)

  
  My question is:

  (1) to apply this procedure (ctx_adm.set_parameter) obliged me to log on as user CTXSYS. Is this fair? or can it be avoided and will be based on the application schema? The CTXSYS user is locked by default and I had to unlock it. Is this OK to do it in production?

  (2) what value I should use for the max_index_memory there are 500 MB - my SGA is 2 GB in Dev / QA and / 3 GB in the production. Also in the creation of the index which is the value should I set for the parameter memory index - I had left to default, but how do I change now? Should it be 50 MB as shown in the example above?

  (3) the white paper also refer to the reconstruction of an index to an interval like once a month: ALTER INDEX DR$ index_name$ X REBUILD online;

  -Is this good advice? I would like to ask the experts once before doing this.  We are on Oracle 11 g and the white paper was drafted in 2003.

  Basically, while I read the book, I'm still not clear on many aspects and need help to understand this.

  Thank you

  OrauserN

  Index entries are built in memory, and then flushed to disk, memory is exhausted. With a setting of high index memory will mean the index entries can be longer and less fragmented, which provides better performance of the query.  Conversely, a small memory parameter index will mean emptied the disk pieces are smaller, so queries (especially on common words) will have to do a lot more e/s to extract several pieces of index for the words.

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

  Dear Sirs,
  
  I am a new user of text Oracle (Oracle 11 g release 11.2) and I'm 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, "it is an example of default data store");
  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 on line 1:
  ORA-29855: an error has occurred in the execution of routine ODCIINDEXCREATE
  ORA-20000: Oracle text error:
  ORA-06508: PL/SQL: called program unit is not found
  ORA-06512: at "CTXSYS. DRUE", line 160
  ORA-06512: at "CTXSYS. TEXTINDEXMETHODS', line 366

  Please check for invalid objects. Connect as sys or system and run:

  Select object owner, object_name, object_type where status = 'INVALID ';

  View the results here and we will advise the next step.
  If all the objects owned by CTXSYS are not valid, you will need to recompile the schema CTXSYS.

• Oracle Text Index

  Hi all
  
  I have a question about the Oracle text Index:
  
  The used Oracle text index after entering data in the CLOB column or before? or anytime.
  
  
  CREATE the INDEX Ora_TXT_Index_ON_Test ON te1 (name) INDEXTYPE IS CTXSYS. CONTEXT;
  
  EXEC DBMS_STATS. GATHER_TABLE_STATS (waterfall of the USER 'TE1' = > TRUE);
  
  concerning

  Hello
  a text index is not used in the normal way. You must use a clause in your SQL statement that is looking for your text by using the keyword Index of contains. An Oracle text Index will be refreshd of way manual or if you specify validation to your index.

  Perhaps this links help
  http://Oracle-text-de.blogspot.co.at/2008/06/scoring-MIT-Oracle-text.html
  http://docs.Oracle.com/CD/B19306_01/text.102/b14218/cqoper.htm

  concerning
  Peter

• Oracle Text Index rebuilt manually or automatically by DEFAULT

  For the following statement:
  
  "The Oracle * text (officially called Oracle and Oracle Intermedia context) utility allows us to analyze through a column of large text and indexes on the words in the column."
  
  Unlike the ordinary tree or bitmap index, index of context, ctxcat and ctxrule Oracle may be * set isn't content update is changed.* like most of Oracle databases will use with standard relational tables ctxcat index, you must decide on a refresh interval.  Oracle provides the SYNC operator for this.  The default value is SY ^ NC = MANUAL and you must manually synchronize the index with CTX_DDL. SYNC_INDEX.
  
  SYNC (MANUAL |) EACH interval 'string ' | ON VALIDATION)]
  
  «As a result, Oracle Text indexes are only useful for removing full table scans when tables are read-only in large part and/or end users don't mind not having 100% search reminder»
  
  -My question: the statement above claims: "Oracle indexes context, ctxcat and ctxrule can be configured to not update the content is changed. '." " Then what is the default setting for updating the index, manual or automatic? For example:
  
  First of all, I created an index like this: create index users_address_idx on users (address) indextype is ctxsys.ctxcat;
  
  Then, I made a few changes on the table such that change the values of the column address for several lines.
  
  The Oracle system will rebuild the ctxcat index automatically?
  
  What does the ' default is SY ^ NC = MANUAL "as shown in the quote?
  
  
  Thank you for helping.
  
  Scott
  

  scottjhn wrote:
  This source: http://www.dba-oracle.com/oracle_tips_like_sql_index.htm States:

  All first upward, please do not use the Web sites which present only part of the information and instead to advertise their services.

  -My question: the statement above claims: "Oracle indexes context, ctxcat and ctxrule can be configured to not update the content is changed. '." " Then what is the default setting for updating the index, manual or automatic? For example:

  First of all, I created an index like this: create index users_address_idx on users (address) indextype is ctxsys.ctxcat;

  Then, I made a few changes on the table such that change the values of the column address for several lines.

  The Oracle system will rebuild the ctxcat index automatically?

  No, the deafult is SYNC = MANUAL
  http://docs.Oracle.com/CD/B28359_01/text.111/b28304/csql.htm#CIHGAAFI
  >

  What does the ' default is SY ^ NC = MANUAL "as shown in the quote?

  This means that the need for the Index to synchronize manually
  http://docs.Oracle.com/CD/B28359_01/text.111/b28304/cddlpkg.htm#i998469

• Oracle Text Index add to Stop List

  Hi all
  
  I have an Oracle (CTXCAT) Index of text on my Oracle 10 g Standard Edition.
  I also have a stop for the tokens in this index list.
  Now, I want to add a few empty words more to the stop list.
  Please guide me...
  
  
  Thanks and greetings
  Alexander gelin

  I think you can do optimization for your specific token token for the Index Rebuild, so no need to fast/full optimization.

  alter index myidx rebuild parameters ('OPTIMIZE TOKEN ORACLE');
  
  OR
  
  begin
    ctx_ddl.optimize_index('myidx','token', TOKEN=>'Oracle');
  end;
  

  If you are not attending the transactions on the base table, you can even synchronize the index rebuild.

  alter index myidx parameters ('SYNC 2M');
  
  OR
  
  begin
  ctx_ddl.sync_index('myindex', '2M');
  end;
  

• Error while creating or rebuilding Oracle text Lexer keyword index

  Hi all
  I am getting following error when I create oracle text indexes using lexer & keyword in the list of stopwords.
  Please help me if any body know.
  Thanks in advance.
  
  
  Error from the 1 in the command line:
  CREATE INDEX TXT_INX_TEXT_SEARCH ON TEXT_SEARCH (BFILE_DOC)
  
  Post INDEXTYPE IS "CTXSYS. "" (LOCAL) CONTEXT.
  PARTITION SETTINGS "BEFORE_2007" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q1_2007" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q2_2007" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q3_2007" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q4_2007" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q1_2008" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q2_2008" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q3_2008" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q4_2008" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q1_2009" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q2_2009" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q3_2009" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q4_2009" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "THE_REST' ('LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)')
  )
  Error in the command line: 1 column: 13
  Error report:
  SQL error: ORA-29855: error when executing routine ODCIINDEXCREATE
  ORA-20000: Oracle text error:
  DRG-11000: invalid keyword LEXER
  ORA-06512: at "CTXSYS. DRUE", line 160
  ORA-06512: at "CTXSYS. TEXTINDEXMETHODS', line 365
  29855 00000 - "an error occurred in the execution of routine ODCIINDEXCREATE.
  * Cause: Cannot run the ODCIIndexCreate routine.
  * Action: Check if the routine was coded correctly.
  
  
  Kind regards
  Jack R.

  Hello

  It works if you put a clause of additional PARAMETERS to the end, so the creation looks like:
  CREATE INDEX TXT_INX_TEXT_SEARCH ON TEXT_SEARCH (BFILE_DOC)
  INDEXTYPE IS "CTXSYS. "" (LOCAL) CONTEXT.
  PARTITION SETTINGS "BEFORE_2007" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q1_2007" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q2_2007" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q3_2007" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q4_2007" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q1_2008" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q2_2008" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q3_2008" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q4_2008" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q1_2009" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q2_2009" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q3_2009" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "Q4_2009" ("LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)"),
  PARTITION SETTINGS "THE_REST' ('LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)')
  )
  PARAMETERS ('LEXER dd_lexer list of words EMPTY dd_stoplist SYNC (ON COMMIT)')<==>

  Hope this helps

  Herald tiomela

• 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.

• (9.2.0.5.0) 9i - Oracle Text - Indexing of Oracle files on the FTP server

  I'm using Oracle 9i (9.2.0.5.0) and I cannot upgrade to a newer version of Oracle DB.
  I am new to this technology, and I have not tried it yet myself.
  
  I was reading some articles, documents or references on Oracle text technology and I find that Oracle text must be able to create an index of context on files residing on the FTP server.
  I also discovered that, for this purpose, a 'URL_DATASTORE' should be used.
  
  I'd be happy if someone can answer my question before I decide to start using this technology:
  Is there a limitation that I should be informed when creating index of context on files residing on the FTP server? (file size limit, limitation of the types of files supported)
  -In the creation of the index process are the files indexed, downloaded and copied in the Oracle database permanently or only temporarily until the index is created?
  -Everything is of incremental indexing (when I add new files in the data store that I don't have to rebuild the entire index)?
  There there a formula between context index disk size and the disk size indexed files?
  
  Kind regards
  
  Michal

  Is there a limitation that I should be informed when creating index of context on files residing on the FTP server? (file size limit, limitation of the types of files supported)
  Maximum file size is configurable up to 2 GB. No limitation on the file type from the data store itself, but if you want to process binary file list filter suported file formats will apply (see the appendix in the Administrator's guide)

  -In the creation of the index process are the files indexed, downloaded and copied in the Oracle database permanently or only temporarily until the index is created?
  That temporarily

  -Everything is of incremental indexing (when I add new files in the data store that I don't have to rebuild the entire index)?
  The question, I suspect that you see this as a robot - you expect to provide the address of an FTP site and have it look for all documents. This isn't how it works. Instead, you must place all of the URLS in a table, and text will index these URLS (and only these URLs)

  If new files are added, you must reorganize somehow having the new lines added to your table. Then the text will do an incremental update, it will not have to rebuild the entire index.

  There there a formula between context index disk size and the disk size indexed files?
  It varies a lot depending on the data types and indexing of selected options, but a typical result is that the index will be 40% of the total size of the file. However, if the documents are in the format (for example, Word, PDF) the percentage will be much smaller.

• 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
  27,386.25	305 441	0.09	16.50	15.82	9.98	ddr8uck5s5kp3		Start ctxsys.drvdml.com_sync_i...
  14,618.81	213 980	0.07	8.81	8.39	27.79	02yb6k216ntqf		begin ctxsys.syncrn (: idxownid,...)

  
  More top sql full text:

  ddr8uck5s5kp3	begin ctxsys.drvdml.com_sync_index (: idxname,: idxmem,: partname); end
  02yb6k216ntqf	begin ctxsys.syncrn (: idxownid,: idxoname,: idxid,: ixpid,: rtabnm,: flg); end;

  Now if I do optimization of the complete index that more often, and not only once night 15:00 will be this average, the load on DB sync on commit will decrease? If Yes, how many times should I optimized and the optimization itself does not lead to a load? Can anyone suggest?

  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