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.

Tags: Database

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29855 00000 - "an error occurred in the execution of routine ODCIINDEXCREATE.
* Cause: Cannot run the ODCIIndexCreate routine.
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CTX_DDL. CREATE_PREFERENCE ("your_lexer", "BASIC_LEXER");

CTX_DDL. SET_ATTRIBUTE ("your_lexer", "' SKIPJOINS,"., @-"'); -to jump. , @ - ' symbols

END;

/

CREATE INDEX my_index2 ON COMPANY (COMPANY_NAME)

INDEXTYPE IS CTXSYS. CONTEXT IN PARALLEL

PARAMETERS ("LEXER your_lexer");
```
SELECT
company_name
FROM company
WHERE CATSEARCH(company.COMPANY_NAME, 'LLC','') > 0
ORDER BY company.COMPANY_ID;
```
output
company_name
1 LSG SOLUTIONS LLC
2 Properties@Oklahoma, LLC
only 2 rows back but must return 3

It helps if you post a copy and paste of effective enforcement of the full code, including the results. You posted an index of context with the query with catsearch, which requires a ctxcat index. You must be a context clue that you did not post and did not add your lexer to. The following table shows it returns all the lines of 3 as planned using either a with catsearch ctxcat index or a context index with contains, as long that you include the lexer in your create index. You must also be sure that the index is created, or synchronized after inserting or updating data.

Scott@ORCL >-version:

Scott@ORCL > SELECT banner version of v$.

BANNER

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

Oracle Database 11 g Enterprise Edition Release 11.2.0.1.0 - 64 bit Production

PL/SQL Release 11.2.0.1.0 - Production

CORE 11.2.0.1.0 Production

AMT for 64-bit Windows: Version 11.2.0.1.0 - Production

NLSRTL Version 11.2.0.1.0 - Production

5 selected lines.

Scott@ORCL >-table and the test data:

Scott@ORCL > CREATE TABLE 'SOCIETY '.

2 ("COMPANY_ID" NUMBER (10,0) NULL NOT ACTIVATE,)

3 'COMPANY_NAME' VARCHAR2 (50 BYTE),

VARCHAR2 (50 BYTE) 4 "ADDRESS1"

5 "ADDRESS2" VARCHAR2 (10 BYTE),

VARCHAR2 (40 BYTE) 6 'CITY',

7 VARCHAR2 (20 BYTE) 'STATE ', HE SAID.

NUMBER (5.0) 8 'ZIP '.

(9) THE CREATION OF IMMEDIATE SEGMENT

PCTFREE 10 10 PCTUSED 40 INITRANS, MAXTRANS NOCOMPRESS SLAUGHTER 1 255

11 STORAGE (INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645)

12 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS USER_TABLES DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT 1)

TABLESPACE 13 "USERS."

Table created.

Scott@ORCL > START

2 insert in SOCIETY (COMPANY_ID, COMPANY_NAME, Address1, Address2, CITY, STATE, ZIP) values (1, 'LSG SOLUTIONS LLC', null, null, null, null, null);

3 insert in SOCIETY (COMPANY_ID, COMPANY_NAME, Address1, Address2, CITY, STATE, ZIP) values (2,' LOVE "S TRAVEL', null, null, null, null, null);

4 insert into SOCIETY (COMPANY_ID, COMPANY_NAME, Address1, Address2, CITY, STATE, ZIP) values (3, 'DEVON ENERGY', null, null, null, null, null);

5 insert into SOCIETY (COMPANY_ID, COMPANY_NAME, Address1, Address2, CITY, STATE, ZIP) values (4, 'SONIC INC', null, null, null, null, null);

6 insert in SOCIETY (COMPANY_ID, COMPANY_NAME, Address1, Address2, CITY, STATE, ZIP) values (5, "MSCI", null, null, null, null, null);

7 insert into SOCIETY (COMPANY_ID, COMPANY_NAME, Address1, Address2, CITY, STATE, ZIP) values (6, 'ERNEST AND YOUNG', null, null, null, null, null);

8 insert in SOCIETY (COMPANY_ID, COMPANY_NAME, Address1, Address2, CITY, STATE, ZIP) values (7, "JOHN DEER", null, null, null, null, null);

9 insert in SOCIETY (COMPANY_ID, COMPANY_NAME, Address1, Address2, CITY, STATE, ZIP) values (8,'Properties@Oklahoma, LLC', null, null, null, null, null);

10 insert into SOCIETY (COMPANY_ID, COMPANY_NAME, Address1, Address2, CITY, STATE, ZIP) values (9, 'D.D.T L.L.C.', null, null, null, null, null);

11 END;

12.

PL/SQL procedure successfully completed.

Scott@ORCL >-lexer:

Scott@ORCL > START

CTX_DDL 2. CREATE_PREFERENCE ("your_lexer", "BASIC_LEXER");

CTX_DDL 3. SET_ATTRIBUTE ("your_lexer", "' SKIPJOINS,"., @-"'); -to jump. , @ - ' symbols

4 END;

5.

PL/SQL procedure successfully completed.

Scott@ORCL >-ctxcat index and using catsearch queries:

Scott@ORCL > CREATE INDEX my_index2 ON COMPANY (COMPANY_NAME)

2 INDEXTYPE IS CTXSYS. CTXCAT PARALLEL

3 PARAMETERS ("LEXER your_lexer");

The index is created.

Scott@ORCL > SELECT

2 company_name

3 the COMPANY

4. WHERE the CATSEARCH (company.COMPANY_NAME, 'LLC', ") > 0

5 ORDER BY company.COMPANY_ID;

COMPANY_NAME

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

LSG SOLUTIONS LLC

Properties@Oklahoma, LLC

D.D.T L.L.C.

3 selected lines.

Scott@ORCL >-context and using the query index contains:

Scott@ORCL > CREATE INDEX my_index3 ON COMPANY (COMPANY_NAME)

2 INDEXTYPE IS CTXSYS. CONTEXT IN PARALLEL

3 PARAMETERS ("LEXER your_lexer");

The index is created.

Scott@ORCL > SELECT

2 company_name

3 the COMPANY

4 WHERE CONTAINS (company.COMPANY_NAME, 'LLC') > 0

5 ORDER BY company.COMPANY_ID;

COMPANY_NAME

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

LSG SOLUTIONS LLC

Properties@Oklahoma, LLC

D.D.T L.L.C.

3 selected lines.

All parameter memory index for Oracle text indexes

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