Build index on olap's table

Hi,
I am on an OLAP application which has a table having millions of records, and the table doesn't have any index. When checking the data found one particular column has total less than 50 distinct values which likely to be a good candidate for building index against. Another column on the same table is composed of [fixed_character_string]_[random_value], e.g. BLABLABLA_000000001, BLABLABLA_000000002, etc. what kind of index should I build, normal index for the first one, and bitmap index for the second?
Last, This is a partitioned table.
Regards

rac100g wrote:
When checking the data found one particular column has total less than 50 distinct values which likely to be a good candidate for building index against. Not true.
rac100g wrote:
Another column on the same table is composed of [fixed_character_string]_[random_value], e.g. BLABLABLA_000000001, BLABLABLA_000000002, Sounds like you should have 2 columns and not one.
In general, we're not going to be able to help you much with the level of detail you have given us.
If you want to share DDL's for the tables, data volumes / distributions as well as the types of queries your application is going to be issuing then we may be able to get somewhere. You may also want to look at using enterprise manager / tuning pack (if your licensed for it), check the documentation for your version (which you should always mention when posting a question).

Similar Messages

Building index from multiple master and child relationship tables

Hello,
My question is:
Is it possible to create the index for master and child tables?
If yes, can you please point me out to any links or give me an example.
Actually i just followed this below link to create the index using multiple tables
Building index from multiple tables for text search
I am able to create the index using above link,but problem accured , when i search for one master data column value then it is returning many rows with same master data for each child row.
for example
SELECT
a.conc_program_name,
a.conc_program_desc,
b.param_name
FROM a_master a, b_child b
WHERE b.report_dtls_id = a.report_id
AND CONTAINS (a.dummy, 'PAY') > 0
Which retruns
PAY Master A
PAY Master B
PAY Master C
Please let me know is there any way i can restrict this to single row with concatination of child data like
PAY Master A B C
Another doubt is ,i have the column value like p_consolidation_set_id,when i give this in CONTAINS (a.dummy, 'p_consolidation_set_id') > 0 ,then not able to get the any results.
please let me what shall i do for this issue.
Thanks
Message was edited by:
user496798

There are various ways to concatenate the values. One nice generic solution is to use Tom Kyte's stragg function:
http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:2196162600402
If p_consolidation_set_id is a variable name, not a value, then do not put quotes around it.
Message was edited by:
Barbara Boehmer

Tip: Improving The Performance Of OLAP DML Table Inserts

Quick Oracle OLAP Tip:
If you need to write the contents of a variable, or a group of variables, to a relational table, you would normally use the SQL INSERT command. Normal practice is to loop round all of the variables' dimension values, inserting the variable values into the relational tables one by one, until the variable has been completely loaded into your database table.
Oracle 9i OLAP however introduces two new commands, SQL PREPARE and SQL EXECUTE (http://download-west.oracle.com/docs/cd/B10501_01/olap.920/a95298/sql5.htm#1027902) , that allow us to prepare our INSERT statement in such a way that it uses bind variables to pass values to the Oracle tables. Bind variables are generally a 'good thing' and reduce the amount of time Oracle has to spend parsing your SQL insert statements. In addition, you can specify additional options with SQL PREPARE to specify 'direct path' insertions (quicker as they bypass the normal SQL engine and directly load data into Oracle blocks), nologging (to eliminate redo log generation), and to nominate individual partitions to load data in to. It's worth noting that there's an error in the current OLAP DML documentation that suggest that any OLAP DML insert operation into an Oracle table locks the entire table, preventing other AW processes from inserting into the table until you commit. This is actually incorrect, and full-table locking only occurs if you use the DIRECT=YES option, which locks the table in the same way that SQL*Loader locks the table as they both use the Direct Path API.
However, an even better solution than using SQL EXECUTE and SQL PREPARE is to use the OLAP_TABLE feature in Oracle 9i (http://download-west.oracle.com/docs/cd/B10501_01/olap.920/a95295/olap_tab.htm#73729) to create a view against your AW variable, then use this view as the source for a "INSERT INTO table SELECT * FROM source" SQL statement, optionally using the /*+ INSERT APPEND */ option if you want to carry out direct path insertions. By using OLAP TABLE and having the SQL engine insert multiple variable values into our target table, rather than having an OLAP DML program loop through the variable and carry out multiple single-row insertions, we were able to increase our write performance by an order of magnitude compared to our earlier SQL INSERT command. One thing to bear in mind though is that, if you are running many copies of the program concurrently, using direct path insertions may well cause lock contention, as each process will obtain an exclusive table lock while the direct insertion takes place. In the case of concurrent processes, it may be better to use conventional path insertions (but still use SQL PREPARE and EXECUTE, or OLAP TABLE) as these only require row-level exclusive locks.

you can use Execution plain
http://stackoverflow.com/questions/7359702/how-do-i-obtain-a-query-execution-plan
and add index.
Index according to the fields you ask queries can improve performance greatly larger!
You can use the statistics for building indexes:
http://www.mssqltips.com/sqlservertip/2979/querying-sql-server-index-statistics/
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Create/drop index on a busy table

Hello,
It's kind-a of a funny question but how do you create or drop a index on a very busy table? (by making the users wait...)
I tried:
lock table <table> in exclusive mode
then in another session (session2)
update <table> set col1 = 'a';
(this session now waits)
then back a the first session:
create index bla on <table> (col1);
And what happens is that the lock is released immediatelly, and in session2 the update updates and I get the standard "RESOURCE BUSY" error.
Any ideas on how to do that ?
Thanks

Jozsef wrote:
Hi there,
I have done similar things couple of times before and I have used a pretty good method to obtain a rough (and it was really a rough, but enough) estimation.
Sorry folks, it does not work properly for create index...this method only works for SELECT statments, SO IGNORE IT :(
It nearly works in 10g:
| Id | Operation              | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | CREATE INDEX STATEMENT |       | 10000 | 40000 |    10   (0)| 00:00:01 |
|   1 | INDEX BUILD NON UNIQUE| T1_I1 |       |       |            |          |
|   2 |   SORT CREATE INDEX    |       | 10000 | 40000 |            |          |
|   3 |    TABLE ACCESS FULL   | T1    | 10000 | 40000 |     6   (0)| 00:00:01 |
Note
   - estimated index size: 196K bytesThe "Note" tells you Oracle's estimate of the final space allocation needed for the index. There are various reasons why the estimate is not very accurate, and why it's not a good estimate of the space requirement in the TEMP tablespace, but it gives you a figure that is probably in the right ballpark (factor of 2 out, either way, probably).
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
"For every expert there is an equal and opposite expert."
Arthur C. Clarke

Create an index on a huge table

hi gurus
I am going to create an index on a very large table(194GB) with the temporary tablespace size is 80G.
I am afraid that during the index creation the temporary tablespace is not enouth to hold the data needed
to create the index,because i only have 80g in temporary tablespace. How do i estimated the size i need to create a such large index and is there an effcient way to do such index creation?
thank u in advance.

Jozsef wrote:
Hi there,
I have done similar things couple of times before and I have used a pretty good method to obtain a rough (and it was really a rough, but enough) estimation.
Sorry folks, it does not work properly for create index...this method only works for SELECT statments, SO IGNORE IT :(
It nearly works in 10g:
| Id | Operation              | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | CREATE INDEX STATEMENT |       | 10000 | 40000 |    10   (0)| 00:00:01 |
|   1 | INDEX BUILD NON UNIQUE| T1_I1 |       |       |            |          |
|   2 |   SORT CREATE INDEX    |       | 10000 | 40000 |            |          |
|   3 |    TABLE ACCESS FULL   | T1    | 10000 | 40000 |     6   (0)| 00:00:01 |
Note
   - estimated index size: 196K bytesThe "Note" tells you Oracle's estimate of the final space allocation needed for the index. There are various reasons why the estimate is not very accurate, and why it's not a good estimate of the space requirement in the TEMP tablespace, but it gives you a figure that is probably in the right ballpark (factor of 2 out, either way, probably).
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
"For every expert there is an equal and opposite expert."
Arthur C. Clarke

Indexes on a fact table

Hi All,
We are trying to build a data warehouse. The data marts would be accessed by cognos reporting layer. In the data marts we have around 9 dimension tables and 1 fact table. For each month we will have around 21-25 million records in the fact table. Out of 9 dimensions there dim1 and dim2 have 21 million and 10 million records respectively. The rest 7 dimensions are very small like less than 10k records.
In cognos reports they are trying to join the some dimension tables and the fact table to populate some reports. they are taking around 5-6 min.
I have around 8 B-Tree indexes on this fact table with all possible combination of columns. I believe that these many indexes is not improving the performance. So I decided to create a aggregated table with measures. But in cognos there are some reports which give detailed information from the fact table and that are taking around 8 min.
please advice as to what type indexes can be created on fact tables.
I read that we can create bit map indexes based on join conditions but the documentation says that it can include columns only from dimension tables and not fact tables. Should the indexed columns be keys in dimensional tables?
I have observed that the fact table is around 1.5gb. But each index is around 1.9 -2gb. I was kind of surprised when I saw that figure. Does it imply that index scan and table lookup would take more time than the full table scan? And hence it is not using the indexes.
Any help is greatly appreciated.
Thanks
Hari

What sort of queries are you running? Do you have an example (with a query plan)?
Are indexes even useful? Or are you accessing too much data to make indexes worthwhile?
Are you licensed to use partitioning? If so, are your fact tables partitioned? Are the queries doing partition pruning?
Are you using parallelism? If so, is parallel query actually being invoked?
If creating aggregate tables is a potentially useful strategy, you would want to use materialized views with query rewrite.
Justin

INDEX UNIQUE SCAN instead of   INDEX FULL SCAN or TABLE ACCESS FULL

I have calculated statistics in all tables and indexes
I have a table and a view and when I put it
SELECT *
FROM TABLE_A A
INNER JOIN VIEW_B B ON A.KEY_ID = B.PFK_KEY_ID
WHERE (B.FK_ID_XXX = 1)
If I see the execution plan:
In TABLE_A make a
TABLE ACCESS BY INDEX ROWID
INDEX UNIQUE SCAN (FIELD_A_TABLE_A_PK)
Itâs OK. I NEED IT (INDEX UNIQUE SCAN)
But If I put
SELECT A.Field_1, A.Field_2, A.Field_3, A.Field_4
FROM TABLE_A A
INNER JOIN VIEW_B B ON A.KEY_ID = B.PFK_KEY_ID
WHERE (B.FK_ID_XXX = 1)
In table A make a TABLE ACCESS FULL.
Then If I put:
SELECT /*+ INDEX(A FIELD_A_TABLE_A_PK) */ A.Field_1, A.Field_2, A.Field_3, A.Field_4
FROM TABLE_A A
INNER JOIN VIEW_B B ON A.KEY_ID = B.PFK_KEY_ID
WHERE (B.FK_ID_XXX = 1)
If I see the execution plan:
In TABLE_A make a
TABLE ACCESS BY INDEX ROWID
INDEX UNIQUE SCAN (FIELD_A_TABLE_A_PK)
Itâs OK. I NEED IT (INDEX UNIQUE SCAN)
Finally, If I put other tables and views in the query (I NEED IT)
For example:
SELECT /*+ INDEX(A FIELD_A_TABLE_A_PK) */ A.Field_1, A.Field_2, A.Field_3, A.Field_4
FROM TABLE_A A
INNER JOIN VIEW_B B ON A.KEY_ID = B.PFK_KEY_ID
INNER JOIN TABLE_Câ¦.
LEFT JOIN VIEW_Dâ¦.
WHERE (B.FK_ID_XXX = 1)
If I see the execution plan:
In TABLE_A make a
TABLE ACCESS BY INDEX ROWID
INDEX FULL SCAN (FIELD_A_TABLE_A_PK)
I need INDEX UNIQUE SCAN instead of INDEX FULL SCAN or TABLE ACCESS FULL.
How can obtain it?
What happens???
Thanks!

Notice the difference in cardinality between your two select statements:
SELECT STATEMENT, GOAL = ALL_ROWS Cost=5 Cardinality=1
SELECT STATEMENT, GOAL = ALL_ROWS Cost=10450 Cardinality=472161Apparently since the optimizer believed the first statement was going to return one row, it used an index. But in the second statement it believed it was going to return nearly the whole table (didn't you say it had around 500k rows?). Hence full table scan.

Can we change the fields of database unique index in a customised table?

Hi all..
I want to know that can we create or change or delete the database unique index of a customized table?
In my case, there is a customised table with 4 primary keys with all the records to be maintained thru transaction code SM30.
There is database unique index maintained for this table which has 2 fields. These 2 fields are out of the 4 primary fields of the table.I hope I have made myself clear!
Now when I am trying to insert a record in the table it give me a short dump.( It says duplication of records is not allowed)
The reason being that the new record that I am trying to insert in the database table has those 2 fields for which the unique index is maintained is the same as an already existing record.And the other two fields are different from the already existing record.So overall the combination of the 4 primary fields is different.
Please tell me how shall I proceed now?
I also tried to change the Unique index but it is asking me some kind of authrization(You are not authorized to make changes (authorization object S_DEVELOP)).Also I am not sure whether changing the unique index is feasible or not.?
Thanks.

hi
I think you will not be able to do unique indexing withou the help of primary keys,so use all the primary keys into the table field selections and and then create indexing otherwise dupilication of keys can occur. if you are not able to keep the primary keys then go for non unique key indexing,where you have to add the client field and the any keys of your wish.

Creating a bit map index on a partitioned table

Dear friends,
I am trying to create a bitmap index on a partitioned table but am receiving the following ORA error. Can you please let me know on how to create a local bit map index as the message suggests?
ERROR at line 1:
ORA-25122: Only LOCAL bitmap indexes are permitted on partitioned tables
Trying to use the keyword local in front leads to wrong syntax.
Thanks in advance !!
Somnath

ORA-25122 Only LOCAL bitmap indexes are permitted on partitioned tables
Cause: An attempt was made to create a global bitmap index on a partitioned table.
Action: Create a local bitmap index instead
Example of a Local Index Creation
CREATE INDEX employees_local_idx ON employees (employee_id) LOCAL;
Example is about btree and I think it will work for bitmap also.

Non-Partitioned Global Index on Range-Partitioned Table.

Hi All,
Is it possible to create Non-Partitioned Global Index on Range-Partitioned Table?
We have 4 indexes on CS_BILLING range-partitioned table, in which one is CBS_CLIENT_CODE(*local partitioned index*) and others are unknown types of index to me??
Means other 3 indexes are what type indexes ...either non-partitioned global index OR non-partitioned normal index??
Also if we create index as :(create index i_name on t_name(c_name)) By default it will create Global index. Please correct me......
Please help me in identifying other 3 indexes types by referring below ouputs!!!
select INDEX_NAME,TABLE_NAME,PARTITIONING_TYPE,LOCALITY from dba_part_indexes where TABLE_NAME='CS_BILLING';
INDEX_NAME TABLE_NAME PARTITI LOCALI
CSB_CLIENT_CODE CS_BILLING RANGE LOCAL
select index_name,index_type,table_name,table_type,PARTITIONED from dba_indexes where table_name='CS_BILLING';
INDEX_NAME INDEX_TYPE TABLE_NAME TABLE_TYPE PAR
CSB_CREATE_DATE NORMAL CS_BILLING TABLE NO
CSB_SUBMIT_ORDER NORMAL CS_BILLING TABLE NO
CSB_CLIENT_CODE NORMAL CS_BILLING TABLE YES
CSB_ORDER_NBR NORMAL CS_BILLING TABLE NO
select INDEX_OWNER,INDEX_NAME,TABLE_NAME,COLUMN_NAME from dba_ind_columns where TABLE_NAME='CS_BILLING';
INDEX_OWNER INDEX_NAME TABLE_NAME COLUMN_NAME
RPADMIN CSB_CREATE_DATE CS_BILLING CREATE_DATE
RPADMIN CSB_SUBMIT_ORDER CS_BILLING SUBMIT_TO_INVOICE
RPADMIN CSB_SUBMIT_ORDER CS_BILLING ORDER_NBR
RPADMIN CSB_CLIENT_CODE CS_BILLING CLIENT_CODE
RPADMIN CSB_ORDER_NBR CS_BILLING ORDER_NBR
select dip.index_name, dpi.locality, dip.partition_name, dip.status
from dba_part_indexes dpi, dba_ind_partitions dip
where dpi.table_name ='CS_BILLING'
and dpi.index_name = dip.index_name;
INDEX_NAME LOCALI PARTITION_NAME STATUS
CSB_CLIENT_CODE LOCAL CSB_2006_4Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2006_3Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2007_1Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2007_2Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2007_3Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2007_4Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2008_1Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2008_2Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2008_3Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2008_4Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2009_1Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2009_2Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2009_3Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2009_4Q USABLE
select * from dba_part_indexes
where table_name ='CS_BILLING'
and locality = 'GLOBAL';
no rows selected
-Yasser
Edited by: YasserRACDBA on Mar 5, 2009 11:45 PM

Yaseer,
Is it possible to create Non-Partitioned and Global Index on Range-Partitioned Table?
Yes
We have 4 indexes on CS_BILLING range-partitioned table, in which one is CBS_CLIENT_CODE(*local partitioned index*) and others are unknown types of index to me??
Means other 3 indexes are what type indexes ...either non-partitioned global index OR non-partitioned normal index??
You got local index and 3 non-partitioned "NORMAL" b-tree tyep indexes
Also if we create index as :(create index i_name on t_name(c_name)) By default it will create Global index. Please correct me......
Above staement will create non-partitioned index
Here is an example of creating global partitioned indexes
CREATE INDEX month_ix ON sales(sales_month)
   GLOBAL PARTITION BY RANGE(sales_month)
      (PARTITION pm1_ix VALUES LESS THAN (2)
       PARTITION pm2_ix VALUES LESS THAN (3)
       PARTITION pm3_ix VALUES LESS THAN (4)
        PARTITION pm12_ix VALUES LESS THAN (MAXVALUE));Regards

Transport of secondary index on /BIC/P table

Hi All,
I have created a secondary index on '/BIC/P table and it is not allowing me to assign a transport object as the table itself is temporary and it gets created automatically in the target system when we activate the info-object.
Is there any way to transport the secondary index directly on the /BIC/P table ?
Its urgent.
Thanks
Soumya

Soumya,
Sorry for not being clear enough: you can change the package of this index and transport it but since the P table could be regenerated automatically by the BW application when you change your IObj you may now get into troubles when importing a change.
Indeed having now a local $TMP table with a non-local object underneath may not please your target system and even not your DEV system...
One can always bypass SAP BW application; for instance creating indexes directly in the database; but this is at its own risk!
hoping this will explain a bit further your issue
Olivier.

How to build a form with multiple tables in oracle application express

Hi everyone,
I have got problem in building a form with multiple tables.I have a main table with (20) columns and this main table is related to the other tables with the primary key-foreign key relation ship.My requirement is i have to build a form which has fields from many tables and all the fields are related to the main table using (ID) column.In that form if i enter ID field i have to get information from differnt tables.
Please help me to solve this (building a form with mutiple tables)
Thank you
sans

Sans,
I am no Apex expert, but with a situation as "complex" as yours, have you thought about creating a VIEW that joins these 7/8 tables, placing an INSTEAD OF trigger on that view to do all the business logic in the database, and base your application on the view?
This is the "thick-database" approach that has been gaining momentum of late. The idea is to put your business logic in the database wherever possible, and let the application (Form, Apex, J2EE, whatever) concentrate on UI issues,

Index for a PSA table is not in the "customer" namespace

Hi,
While loading data through infosource 0CO_OM_WBS_1 to
data target 0IMFA_1 loading failes and the reason given is that the system reads data from PSA table /BIC/B0001060000 of 0IM_FA_IQ_9 and the index generated for this table supplied return code 14.
I found no notes in the subject - with the syntax :
Index for a PSA table is not in the "customer" namespace.
thanks in advance for your help.

Hi,
I think you need to speak to your basis guys / DBA as index created on PSA table is not in your tablespace. He should be able to help you.
Vikash

How can I create index(uniqie index) for a existed table?

Hi guys,
I want to create a index for a existed table, it should be unique index. I did it using se11, "indexes," and select the radio button "unqiue index", of course the fields as well. But when I activate it, I get a waring and therefore can not create this index. But if I select radio button "non-uniqe index", it works.
However I have to reate a unqiue index.
How can I do it?
Thanks in advance
Regards,
Liying

HI Wang
You can create your index via SE11, enter the table name, click change, choose Go To, Indexes. Here create your index with the key fields that you want. To use the index, your select statement WHERE clause, you must have the key fields of the index in the order that they appear in the index. The "optimizer" will choose the index depending on your fields of the WHERE clause.
One thing to remember is that when you create indexes for tables, the update or insert of these tables may have a slower response then before, I for one have never seen a big problem as of yet.
this Document may help u on primary and secondary indexes :
http://jdc.joy.com/helpdata/EN/cf/21eb20446011d189700000e8322d00/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/cf/21eb47446011d189700000e8322d00/content.htm
If it helps Reward the points
Regards,
Rk
Message was edited by:
Rk Pasupuleti

Showing Zero values in OLAP Pivot Table for Excel 2007

Hello,
I needed a help to a problem. Is it possible to show the values with No sales in an Olap Pivot Table ??
I have a sales Cube, and brwsing it via excel i wanted to filter on a Product Category and see how many products in this category had made no Sales. By default the Pivot table doesn't shows the empty values, so if i check the Showm empty rows option for
Pivot Tables, i see the whole of the products populated with and without sales, and i can't filter further. Is there a way i can only get those which have no sales.
Vinish Viswanathan

Happy Holidays,
I can slice on product categories in Excel 2013 with these settings for the Pivot Table:
Activate "Show items with no data for rows and columns"
Apply a value filter that says that the measure should filter on values = 0
Have the product natural hierarchy on rows with levels product category->subcategory->product.
Expand the levels below product category
Use the product category attribute and not the hierarchy as the filter.
I do not have Excel 2007 installed anymore.
HTH
Thomas Ivarsson

Build index on olap's table

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