Create indexes with NOLOGGING option

Hello

Can you please provide solution on the following scenario?

If I create indexes with NOLOGGING Tablespace that is created with the LOGGING option, option can you please let me know what are the effects on the database?

If I create indexes using NOLOGGING on Tables that are created with the LOGGING option, can you please let me know that it is to increase performance during the creation / rebuild indexes?

Thank you

Published by: user12088323 on December 28, 2010 12:45

Published by: user12088323 on December 28, 2010 12:47

user12088323 wrote:
The database is in log mode archive. I would like to create indexes with NOLOGGING option on the tables to increase performance. The tables are created with the LOGGING option. Can you please let me know it's to create a bad effect on the database? If so, please explain.

Thank you

Published by: user12088323 on December 28, 2010 16:37

NOLOGGING will cease to produce data AGAIN... for which you want to execute the instructions.
Nothing wrong... it is created by ORACLE ;-)

read this and cross with your process. You can do it with nologging option.

http://www.Oracle.com/technetwork/database/RDB/0804-NOLOGGING-option-130004.PDF

hope you understood

Tags: Database

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http://richardfoote.files.WordPress.com/2007/12/index-internals-rebuilding-the-truth.PDF

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  <xs:element name="value" type="xs:string" oraxdb:propNumber="3795" oraxdb:global="true" oraxdb:SQLName="value" oraxdb:SQLType="VARCHAR2" oraxdb:memType="1" oraxdb:defaultTable="value748_TAB" oraxdb:defaultTableSchema="MYUSER"/>
  <xs:element name="key" type="xs:string" oraxdb:propNumber="3796" oraxdb:global="true" oraxdb:SQLName="key" oraxdb:SQLType="VARCHAR2" oraxdb:memType="1" oraxdb:defaultTable="key747_TAB" oraxdb:defaultTableSchema="MYUSER"/>
  <xs:element name="actionSubId" type="xs:integer" oraxdb:propNumber="3797" oraxdb:global="true" oraxdb:SQLName="actionSubId" oraxdb:SQLType="NUMBER" oraxdb:memType="2" oraxdb:defaultTable="actionSubId746_TAB" oraxdb:defaultTableSchema="MYUSER"/>
  <xs:element name="time" type="xs:integer" oraxdb:propNumber="3798" oraxdb:global="true" oraxdb:SQLName="time" oraxdb:SQLType="NUMBER" oraxdb:memType="2" oraxdb:defaultTable="time745_TAB" oraxdb:defaultTableSchema="MYUSER"/>
  <xs:element name="reservationType" type="xs:string" oraxdb:propNumber="3799" oraxdb:global="true" oraxdb:SQLName="reservationType" oraxdb:SQLType="VARCHAR2" oraxdb:memType="1" oraxdb:defaultTable="reservationType744_TAB" oraxdb:defaultTableSchema="MYUSER"/>
  <xs:element name="softwareVersion" type="xs:string" oraxdb:propNumber="3800" oraxdb:global="true" oraxdb:SQLName="softwareVersion" oraxdb:SQLType="VARCHAR2" oraxdb:memType="1" oraxdb:defaultTable="softwareVersion743_TAB" oraxdb:defaultTableSchema="MYUSER"/>
  <xs:element name="eventId" type="xs:string" oraxdb:propNumber="3801" oraxdb:global="true" oraxdb:SQLName="eventId" oraxdb:SQLType="VARCHAR2" oraxdb:memType="1" oraxdb:defaultTable="eventId742_TAB" oraxdb:defaultTableSchema="MYUSER"/>
  <xs:element name="vin" type="xs:string" oraxdb:propNumber="3802" oraxdb:global="true" oraxdb:SQLName="vin" oraxdb:SQLType="VARCHAR2" oraxdb:memType="1" oraxdb:defaultTable="vin741_TAB" oraxdb:defaultTableSchema="MYUSER"/>
</xs:schema>

How can I create an index on these tables of the ordered collection to improve performance?

I found the example at http://docs.Oracle.com/CD/E11882_01/AppDev.112/e23094/xdb_rewrite.htm#ADXDB5859 but am not able to apply to this particular case...

Thank you in advance...

If the schema is not annotated and XS: Integer and XS: String are mapped to types of data NUMBER and VARCHAR2 (4000), so you must use in your query to avoid typecasting unnecessary operations.

You must also use XMLTABLEs chained when accessing a parent/child instead of a FLWOR expression relationship, otherwise the CBO cannot rewrite the XQuery query correctly (maybe it's fixed in the latest version).

If you make these changes, the plan should show the cleaner predicates:

SQL > SELECT EVENT_ID, MESSAGE_ID, ACTION_TYPE, ACTION_SUB_ID, ACTION_TIMESTAMP

2 FROM test_table

3 XMLTABLE ('/ monitoring ')

4 COLUMNS XML_CONTENT OF PASSAGE

5 WAY of VARCHAR2 (4000) EVENT_ID "ID."

6 actions for XMLTYPE PATH 'action '.

(7) T1,

8 XMLTABLE ('/ action')

Shares of PASSAGE 9 COLUMNS

NUMBER of ACTION_SUB_ID 10 PATH "actionSubId."

11 PATH of VARCHAR2 (4000) ACTION_TYPE "type."

12 WAY of NUMBER ACTION_TIMESTAMP 'time '.

(13) T2

14 WHERE EVENT_ID IS NOT NULL

15 AND ACTION_SUB_ID IS NOT NULL

16;

Execution plan

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

Hash value of plan: 1763884463

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

| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |

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

|   0 | SELECT STATEMENT |                 |   109.   220K |     6 (17). 00:00:01 |

|   1. THE MERGE JOIN.                 |   109.   220K |     6 (17). 00:00:01 |

|* 2 |   TABLE ACCESS BY INDEX ROWID | TEST_TABLE |    11.   352.     2 (0) | 00:00:01 |

|   3.    INDEX SCAN FULL | SYS_C007567 |    11.       |     1 (0) | 00:00:01 |

|* 4 |   JOIN TYPE.                 |   109.   216K |     4 (25) | 00:00:01 |

|* 5 | TABLE ACCESS FULL | T_OR_MON_ACTION | 106 S 216K | 3 (0) | 00:00:01 |

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

Information of predicates (identified by the operation identity card):

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

2 - filter("TEST_TABLE".") (' SYS_NC00012$ ' IS NOT NULL)

4 - access("SYS_ALIAS_0".") NESTED_TABLE_ID "=" TABLE_TEST. " ("' SYS_NC0000800009$ ')

filter ("SYS_ALIAS_0". "NESTED_TABLE_ID"="TABLE_TEST" "." " ("SYS_NC0000800009$")

5 - filter("SYS_ALIAS_0"." actionSubId» IS NOT NULL)

Note

-----

-dynamic sample used for this survey (level = 2)

Now, if it is still necessary, everything boils down to choosing a technique for index NULL values:

-composite index with a column not zero or constant

-FBI

-bitmap image

Choose the one that best fits your data, the selectivity and activity on the tables.

Cannot create indexes on the flow table

Hello
I'm new to ODI.
The problem is that during the execution of an interface, I get the error of the "IKM Oracle Dimension to slow variation"
The command in step "Create unique index on the flow table:
creating index < % = odiRef.getTable ("L", "INT_NAME", "A") % > idx
on < % = odiRef.getTable ("L", "INT_NAME", "A") % > (< % = odiRef.getColList ("", "[column]", ",", "", "SCD_NK") % >)
< % = odiRef.getUserExit ("FLOW_TABLE_OPTIONS") % >
generate the following statement which lacks the name of the column between the (_)
Create index I$ _MYTABLE_idx
I have $_MYTABLE)
NOLOGGING
The result is that the interface fails with the error 936: 42000: java.sql.SQLException: ORA-00936: lack of expression caused by the previous command wrong.
Please, can you help me?
Thank you very much
Angelo

Hello

I'm really really sorry! I just realized that you are working on the SCD. Basically, you are looking for all the column mapped as SCD_NK (key to slowly change natural Dimensions) insofar as shown here

Substitution QAnywhere

IF you need to read this

SCD Type 2 - ODIExperts.com

Let me know.

Creating INDEX on a BLOB column in a separate tablespace

Hello

Our database contains 2 storage spaces :
-Tablespace DATA : is reserved to hold the data.
-Tablespace INDX: is reserved to hold the index.

For some reason, that we must create the indexes on columns of type blob and the pending order are:
SQL > CREATE INDEX my_index ON DOC_CONTENTS (doc_content) INDEXTYPE IS CTXSYS. CONTEXT; / / doc_content a blob type.
SQL> index created
Now, all indexes are created in the tablespace for DATA that is not good, they should be created in the tablespace INDX (now is empty)
For this reason, and after a search, I specified the tablespace INDX , which will contain the index, and the used command is:
SQL > CREATE INDEX my_index ON DOC_CONTENTS (doc_content) INDEXTYPE IS CTXSYS. CONTEXT TABLESPACE INDX;
*
ERROR on line 1:
ORA-29850: invalid option for creating domain index
NB: also, when I try to use the same command with varchar column, it works.
SQL > CREATE INDEX my_index ON DOC_CONTENTS (doc_name) TABLESPACE INDX; / / doc_content a type VARCHAR2.
SQL> index created

Do you have an idea on how to create indexes on a blob column in a different tablespace?

This question has nothing to do with the Oracle objects, but is related to Oracle Text, then perhaps that some moderator moves text objects.

To specify a storage space for a ctxsys.context Oracle Text index domain index tables, you must create a storage preference, specify storage spaces in attributes of this preference, then use this preference in settings of creating index. Please see the example below which shows first create domain index tables in the default users tablespace, then the creation of the field tables to be indexed in the example tablespace.

Scott@orcl_11gR2 >-test environment:

Scott@orcl_11gR2 > doc_contents CREATE TABLE

2 (doc_content BLOB)

3.

Table created.

Scott@orcl_11gR2 > INSERT INTO doc_contents VALUES

2 (UTL_RAW. CAST_TO_RAW ("test data"))

3.

1 line of creation.

Scott@orcl_11gR2 >-create domain index tables in default users tablespace:

Scott@orcl_11gR2 > my_index CREATE INDEX

2 doc_contents (doc_content)

3 INDEXTYPE IS CTXSYS. FRAMEWORK

4.

The index is created.

Scott@orcl_11gR2 > SELECT index_name, nom_tablespace

2 FROM user_indexes

3. WHERE index-name LIKE '% MY_INDEX % '.

4.

INDEX_NAME TABLESPACE_NAME

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

MY_INDEX

DR.$ MY_INDEX$ X USERS

2 selected lines.

Scott@orcl_11gR2 > SELECT table_name, nom_tablespace

2 FROM user_tables

3 WHERE table_name LIKE '% MY_INDEX % '.

4.

TABLE_NAME, TABLESPACE_NAME

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

DR. MY_INDEX$ I HAVE USERS

USERS R DR$ MY_INDEX$

DR.$ MY_INDEX$ N

DR.$ MY_INDEX$ K

4 selected lines.

Scott@orcl_11gR2 >-creating the tables index field in example of tablespace:

Scott@orcl_11gR2 > my_index DROP INDEX

2.

The index is deleted.

Scott@orcl_11gR2 > start

2 ctx_ddl.create_preference ("mystore', 'BASIC_STORAGE'");

3 ctx_ddl.set_attribute ("mystore', 'I_TABLE_CLAUSE',")

4 "tablespace storage example (original 1 K) ');

5 ctx_ddl.set_attribute ("mystore', 'K_TABLE_CLAUSE',")

6 "tablespace storage example (original 1 K) ');

7 ctx_ddl.set_attribute ("mystore', 'R_TABLE_CLAUSE',")

8 ' lob tablespace storage example (original 1 K)

9 (data) store as (storage off in row cache)');

10 ctx_ddl.set_attribute ("mystore', 'N_TABLE_CLAUSE',")

11 "tablespace storage example (original 1 K) ');

12 ctx_ddl.set_attribute ("mystore', 'I_INDEX_CLAUSE',")

13 ' example of tablespace storage (initial 1 K) compress 2 ');

14 ctx_ddl.set_attribute ("mystore', 'P_TABLE_CLAUSE',")

15 "tablespace storage example (original 1 K) ');

16 ctx_ddl.set_attribute ("mystore', 'S_TABLE_CLAUSE',")

17 "tablespace storage example (original 1 K) ');

18 end;

19.

PL/SQL procedure successfully completed.

Scott@orcl_11gR2 > my_index CREATE INDEX

2 doc_contents (doc_content)

3 INDEXTYPE IS CTXSYS. FRAMEWORK

4 PARAMETERS ('STORAGE mystore')

5.

The index is created.

Scott@orcl_11gR2 > SELECT index_name, nom_tablespace

2 FROM user_indexes

3. WHERE index-name LIKE '% MY_INDEX % '.

4.

INDEX_NAME TABLESPACE_NAME

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

MY_INDEX

DR.$ MY_INDEX$ X FOR EXAMPLE

2 selected lines.

Scott@orcl_11gR2 > SELECT table_name, nom_tablespace

2 FROM user_tables

3 WHERE table_name LIKE '% MY_INDEX % '.

4.

TABLE_NAME, TABLESPACE_NAME

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

DR. MY_INDEX$ I EXAMPLE

DR.$ MY_INDEX$ R EXAMPLE

DR.$ MY_INDEX$ N

DR.$ MY_INDEX$ K

4 selected lines.

Post edited by: BarbaraBoehmer (corrected for error due to the already existing preference)

Create indexes with NOLOGGING option

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