Oracle 11g R1: How to create indexes automatically in tablespaces?

Hello,
Obviously, due to maintenance and performance reasons it is better to put indexes in own tablespaces, separated from the data.
I would like to know now whether there is a way under Oracle 11g R1 to create every index automatically in a tablespace?..or the indexes can only be created manually?
Unfortunately i wasn't able to find any hint in the documentation or by googlin' it.
Thanks in advance.
Regards,
Lars

Hi Lars
I wouldn't be quite so sure having a separate tablespace just for indexes is better for either performance or maintenance reasons if I were you ...
For your enjoyment, some reasons why this simply is not true:
http://richardfoote.wordpress.com/2008/04/16/separate-indexes-from-tables-some-thoughts-part-i-everything-in-its-right-place/
http://richardfoote.wordpress.com/2008/04/18/separate-indexes-from-tables-some-thoughts-part-ii-there-there/
http://richardfoote.wordpress.com/2008/04/28/indexes-in-their-own-tablespace-availabilty-advantages-is-there-anybody-out-there/
http://richardfoote.wordpress.com/2008/05/02/indexes-in-their-own-tablespace-recoverability-advantages-get-back/
Cheers
Richard Foote
http://richardfoote.wordpress.com/

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Edited by: user8731258 on Jul 13, 2012 12:35 AM

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<b>NOTE :</b> That would also work with a global index.
Of course, it remains a rather dirty tweak...
;-)

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</xs:element>
<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 ordered collection tables in order 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 it to this particular case...
Thank you in advance...

If the schema is not annotated then xs:integer and xs:string are mapped to NUMBER and VARCHAR2(4000) datatypes, so you have to use those in your query in order to avoid unnecessary typecasting operations.
You should also use chained XMLTABLEs when accessing a parent/child relationship instead of a FLWOR expression, otherwise the CBO may not rewrite the XQuery correctly (maybe it's fixed in the latest release).
If you make those changes, the plan should show cleaner predicates :
SQL> SELECT EVENT_ID, ACTION_SUB_ID, MESSAGE_ID, ACTION_TYPE, ACTION_TIMESTAMP
2 FROM test_table,
3 XMLTABLE('/monitoring'
4    PASSING XML_CONTENT COLUMNS
5      EVENT_ID         VARCHAR2(4000) PATH 'eventId',
6      actions          XMLTYPE        PATH 'action'
7    ) T1,
8 XMLTABLE('/action'
9    PASSING actions COLUMNS
10      ACTION_SUB_ID    NUMBER PATH 'actionSubId',
11      ACTION_TYPE      VARCHAR2(4000) PATH 'type',
12      ACTION_TIMESTAMP NUMBER PATH 'time'
13 ) T2
14 WHERE EVENT_ID IS NOT NULL
15 AND ACTION_SUB_ID IS NOT NULL
16 ;
Execution Plan
Plan hash value: 1763884463
| Id | Operation                    | Name            | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT             |                 |   109 |   220K|     6 (17)| 00:00:01 |
|   1 | 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 FULL SCAN           | SYS_C007567     |    11 |       |     1   (0)| 00:00:01 |
|* 4 |   SORT JOIN                  |                 |   109 |   216K|     4 (25)| 00:00:01 |
|* 5 |    TABLE ACCESS FULL         | T_OR_MON_ACTION |   109 |   216K|     3   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   2 - filter("TEST_TABLE"."SYS_NC00012$" IS NOT NULL)
   4 - access("SYS_ALIAS_0"."NESTED_TABLE_ID"="TEST_TABLE"."SYS_NC0000800009$")
       filter("SYS_ALIAS_0"."NESTED_TABLE_ID"="TEST_TABLE"."SYS_NC0000800009$")
   5 - filter("SYS_ALIAS_0"."actionSubId" IS NOT NULL)
Note
   - dynamic sampling used for this statement (level=2)
Now, if still necessary, it all boils down to choosing a technique to index NULL values :
- composite index with a not null or constant column
- FBI
- bitmap
Pick one that best fits your data, selectivity and activity on the tables.

How to create index

In sql*plus i do as follows:
sql>create table xmltable(id number primary key,xml_text varchar2(2000));
sql>insert into xmltable values(1,'c:\temp\a1.xml');
sql>insert into xmltable values(2,'c:\temp\a2.xml');
sql>insert into xmltable values(3,'c:\temp\a3.xml');
The contents of file "a1.xml" located at directory "c:\temp" are:
<Order>
<tradeType>2</tradeType>
<tradeAmount>-2000.0</tradeAmount>
<webSiteCode>dangdang</webSiteCode>
<sellerCode>dangdang</sellerCode>
<orderNumber>A20021</orderNumber>
<tradeDate>2001-12-12</tradeDate>
<currencyType>156</currencyType>
</Order>
now if I want to create index what should I do?
I have created index in interMedia text manager (I don't know how to set the index options)
but when I executed the following statement:
sql>select id from xmltable
where contains(xml_text,'156 within currencyType')>0;
I find the error:ORA-20000: interMedia Text error: currencyType is not existed
why?????

In order to index XML files located in the file system, you have to define some indexing parameters. First, create a preference for the datastore type:
begin
ctx_ddl.create_preference('COMMON_DIR','FILE_DATASTORE');
ctx_ddl.set_attribute('COMMON_DIR','PATH','c:\temp');
end;
Then, define a XML section group, e.g.:
begin
ctx_ddl.create_section_group('XML_GROUP','xml_section_group');
ctx_ddl.add_zone_section('XML_GROUP', 'Order', 'Order');
ctx_ddl.add_zone_section('XML_GROUP', 'currencyType', 'currencyType');
end;
Now you can create the index:
create index myindex on xmltable(xml_text)
indextype is ctxsys.context
parameters ('datastore COMMON_DIR section group XML_GROUP');
Your select statement should work fine now. For more information about indexing, I recommend taking a look at the Oracle Text Reference.
Roman

I want information in practical sceario how to create indexes?

hi,
i want complete information about indexes? how create indexes in real time?

" Secondary Database
First it must be stated that table design is a more logical work while index design is rather technical. In table design it might make sense to place certain fields (client, company code, ...) in the beginning. In index design, this is not advisable. Very important for an index is that it contains very selective fields in the beginning. Those are fields like object numbers. Not selective are client, company code, ...
Indexes should be small (few fields). The Database optimizer can combine two or more indexes to execute a query.
Indexes of one table should be disjoint (have few common fields), in order not to confuse the optimizer which index to use.
Note that each index slows the inserts into the table down. Updates are only slowed down if indexed fields are updated. In general, heavy inserted tables should have only few indexes while heavy selected tables might have more.
" Creating Secondary Indexes
Procedure
1.In the maintenance screen of the table, choose Indexes.
If indexes already exist on the table, a list of these indexes is displayed. Choose .
2.In the next dialog box, enter the index ID and choose
The maintenance screen for indexes appears.
3.Enter an explanatory text in the field Short text.
You can then use the short text to find the index at a later time, for example with the R/3 Repository Information System.
4.Select the table fields to be included in the index using the input help for the Field name column.
The order of the fields in the index is very important. See What to Keep in Mind for Secondary Indexes.
5.If the values in the index fields already uniquely identify each record of the table, select Unique index.
A unique index is always created in the database at activation because it also has a functional meaning (prevents double entries of the index fields).
6.If it is not a unique index, leave Non-unique index selected.
In this case you can use the radio buttons to define whether the index should be created for all database systems, for selected database systems or not at all in the database.
7.Select for selected database systems if the index should only be created for selected database systems.
Click on the arrow behind the radio buttons. A dialog box appears in which you can define up to 4 database systems with the input help. Select Selection list if the index should only be created on the given database systems. Select Exclusion list if the index should not be created on the given database systems. Choose .
8.Choose activate.
" Result
The secondary index is automatically created in the database during activation if the corresponding table was already created there and index creation was not excluded for the database system.
You can find information about the activation flow in the activation log, which you can call with Utilities ® Activation log. If errors occurred when activating the index, the activation log is automatically displayed.
" How to Check if an Index is Used
Procedure
1.Open a second session and choose System -> Utilities ->Performance trace.
The Trace Requests screen appears.
2.Select Trace on.
The SQL trace is activated for your user, that is all the database operations under your user are recorded.
3.In the first window, perform the action in which the index should be used.
If your database system uses a cost-based optimizer, you should perform this action with as representative data as possible. A cost-based optimizer tries to determine the best index based on the statistics.
4.In the second session, choose Trace off and then Trace list.
Result
The format of the generated output depends on the database system used. You can determine the index that the database used for your action with the EXPLAIN function for the critical statements (PREPARE, OPEN, REPOPEN).
" What to Keep in Mind for Secondary Indexes
How well an existing index supports data selection from a table largely depends on whether the data selected with the index represents the data that will ultimately be selected. This can best be shown using an example.
' Example :
An index is defined on fields FIELD1, FIELD2, FIELD3 and FIELD4 of table BSPTAB in this order. This table is accessed with the SELECT statement:
SELECT * FROM BSPTAB WHERE FIELD1 = X1 AND FIELD2 = X2 AND FIELD4= X4.
Since FIELD3 is not specified more exactly, only the index sorting up to FIELD2 is of any use. If the database system accesses the data using this index, it will quickly find all the records for which FIELD1 = X1 and FIELD2 = X2. You then have to select all the records for which FIELD4 = X4 from this set.
The order of the fields in the index is very important for the accessing speed. The first fields should be those which have constant values for a large number of selections. During selection, an index is only of use up to the first unspecified field.
Only those fields that significantly restrict the set of results in a selection make sense for an index.
Reward points if it is usefull.....
Girish

How to create index category for TREX in ECC for E-recruiting

Hi guys,
   i have finished the settings in SKPR07 transaction for SSR and attached to the HR_KW the SSR id.
   But i don't know how to create or generate the index category.
   From the posts of this forum someone told me to regenerate the index in SKPR07 , but i failed.
   Can anyone show me the way?
   Thanks in advance.
    sheery

The solution is so simple you want to kick yourself....
You need to upload a document. The index catagory is created automatically. I recommend simply adding an attachment to a candidates profile.
;p)

How to create index for a column of a view

Hi,
I have created view for a table and then i am trying to create index for a column of that view. i am using the query "CREATE INDEX index_name ON view_name (col)". but Mysql is showing error like "view_name is not a base table".
How can i do that......

As mentioned this is a java forum not a mysql forum, but as I know the answer - you can't create an index directly on a view in mysql.

Oracle 11g xe Failed to create the required folder

Hi all...
I had installed RHEL 4.. Actually i am installing oracle 11g XE in linux..
but i got an error message and displayed that below
[root@localhost Disk1]# rpm -ivh oracle-xe-11.2.0-1.0.x86_64.rpm
Preparing... ########################################### [100%]
1:oracle-xe ########################################### [100%]
Executing post-install steps...
You must run '/etc/init.d/oracle-xe configure' as the root user to configure the database.
[root@localhost Disk1]# su -
[root@localhost ~]# /etc/init.d/oracle-xe configure
Oracle Database 11g Express Edition Configuration
This will configure on-boot properties of Oracle Database 11g Express
Edition. The following questions will determine whether the database should
be starting upon system boot, the ports it will use, and the passwords that
will be used for database accounts. Press <Enter> to accept the defaults.
Ctrl-C will abort.
Specify the HTTP port that will be used for Oracle Application Express [8080]:
Specify a port that will be used for the database listener [1521]:
Specify a password to be used for database accounts. Note that the same
password will be used for SYS and SYSTEM. Oracle recommends the use of
different passwords for each database account. This can be done after
initial configuration:
Confirm the password:
Do you want Oracle Database 11g Express Edition to be started on boot (y/n) [y]:y
Starting Oracle Net Listener...Done
Configuring database...grep: /u01/app/oracle/product/11.2.0/xe/config/log/*.log: No such file or directory
grep: /u01/app/oracle/product/11.2.0/xe/config/log/*.log: No such file or directory
Done
/bin/chmod: cannot access `/u01/app/oracle/diag': No such file or directory
Starting Oracle Database 11g Express Edition instance...Done
Installation completed successfully.
Regards
delphi

Yes ,. Me too got the same problem after running /etc/init.d/ oracle-xe configure.
Do you want Oracle Database 11g Express Edition to be started on boot (y/n) [y]:
Starting Oracle Net Listener...Done
Configuring database...grep: /u01/app/oracle/product/11.2.0/xe/config/log/*.log: No such file or directory
grep: /u01/app/oracle/product/11.2.0/xe/config/log/*.log: No such file or directory
Done
/bin/chmod: cannot access `/u01/app/oracle/diag': No such file or directory
Starting Oracle Database 11g Express Edition instance...Done
Installation completed successfully.
when i check the location manually the the diag folder and the log file is not created. also no .dbf files in oradata folder!!
Anyone have resolution for this??

Oracle 11g R1: How to create indexes automatically in tablespaces?

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