Max no of columns in a view

Is there a limit to the maximum number of columns which can be shown in a view? i am using oracle 8.1.7.
Thanks
Anupam.

You can design a view with up to 1000 columns, just like a table.

Similar Messages

At max how many columns is advisable to create in a table/view

Hi All,
I have two transaction table from which i want to create a simple view or materialized view. But the number of columns is about 200. So i want to know at max how many columns is advisable from the performance point of view.
Even though i will create 200 columns in a view , for a perticular client installation i may not use all the columns.
one more thing i will never use 200 columns in the select statement . At a time i will use only 4/5 columns.
It may happen from this four column one column will be the 1st and 2nd column will be the 200th one.
I want to know how it affects the performance and in which scenario . Please help if any body knows or already faced this kind of scenario.
I am using oracle 10g .

Annapurna Nayak wrote:
thanks for ur reply .
We are going to use this view in a report , so if i will create it as simple view it will affect report performance. because the view script is too long ...so every time quring to a view will decrease the performance.
Are you asking me if it will? I think it probably won't but of course you have the means to test it to be sure, right?
As u said MV should be done with minimum possible column . what can be the maximum column in MV ..??It would be defined by the limits on:
* The maximum number of columns that a table can contain
* The size of the query needed to define the select statement
* Limitations on queries needed to maintain the data
http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/limits003.htm#i288032

How to increase the the max limit column in pivot view in BIEE 11G?

Hi Experts,
How to increase the the max limit column in pivot view in BIEE 11G?
When the number of column exceed 256 in pivot view, it will generate the following error message as below:
Exceeded configured maximum number of allowed output prompts, sections, rows, or columns.
Error Details
Error Codes: IRVLJWTA:OI2DL65P
Location: saw.httpserver.processrequest, saw.rpc.server.responder, saw.rpc.server, saw.rpc.server.handleConnection, saw.rpc.server.dispatch, saw.threadpool.socketrpcserver, saw.threads
SQL Issued: 13678~vid1ptgt0v5ubh39gesnauuhl6
For example:
----------------Day
Country-----20120101---20120102---..........20121231
China--------10000---------20000----......

Try increasing the Max Rows in Instanceconfig.xml
Path:-Middleware\instances\instance1\bifoundation\OracleBIPresentationServices\instanceconfig.xml
<ServerInstance>
<Views>
<Pivot>
<MaxVisibleColumns>300</MaxVisibleColumns>
<MaxVisiblePages>1000</MaxVisiblePages>
<MaxVisibleRows>500</MaxVisibleRows>
<MaxVisibleSections>25</MaxVisibleSections>
<DefaultRowsDisplayed>30</DefaultRowsDisplayed>
</Pivot>
</Views>
</ServerInstance>
Try adding this in the config file and restart the services.
Mark as correct if it is helpful.
Thanks.

Database best practice: max number of columns

I have two questions that I would appreciate comments on...
We have a table titled TRANSACTION with 160 columns and a view titled TRANSACTIONS_VIEW with 233 columns in it. This was designed by someone a while ago. I am wondering if it is against best practice to have this many columns in a table? I have never before seen a table with this many columns in it and feel that there must be a way to split the data into multiple tables to make it more manageable.
My second question is on partitions, the above table TRANSACTION is partitioned by manually specifying partitions with max values on the transaction date starting august 2008 through january 2010 at 1 month increments. Isn't it much better to specify automatic partitioning using the interval clause?

kev374 wrote:
thanks for the response, yes there are many columns that violate 3NF and that is why the column count is so high.
Regarding the partition question, by better I meant by using "interval" the partitions could be created automatically at the specified interval instead of having to create them manually.The key is to understand the logic behind these tables and columns. Why it was designed like this, if it's business requirement then 200 some columns are not bad, if it's design flaw 20 columns could be too much. It's not necessarily always good to have strict 3NF design, sometime for various reason you can denormalize the tables to get better performance.
As to partitioning Q, you have to do the rolling window (drop/add partition as time goes by) type of partitioning scheme manually so far.

Problem with binding value on the UI from a calculated column in the view

I have calculated field "Readiness" in my db view, which gets calculated based on other columns in the same table. I have added new column to my EO using "Add from table" option and added the same column from to VO using "Add from EO" option. In my application, I will update a particular date field in the UI and this calculated column "Readiness" in the db will be set to yes or no and this logic is working fine, both date date field and calculated field are in same view object. I have added a attribute binding to this "Readiness" column in my view page. The problem is the calculated column value does not reflect the new value in the db, it shows the old value. I have tried different refresh option for the iterator and ppr option for the field binding. Even after reloading the page, the value shown on the UI page is different from the value in db, other bindings on the UI page works fine, not sure any special settings are required for the Calculated columns. any ideas are appreciated.
Thanks for your help,
Surya

I tried to add soms debugging statements in the EO and getters method, the calcaulated column is not picking the value in db view. I'm not any special iterator/field settings are required at BC level. I'm a newbie, any help is appreciated.
Thanks,
Surya

How to cast a column of a derived column in a view to NULL

I have a derived column in my view and this column by default is picked up as not null.
I want to cast it to null how can i do it ?
Actual column
column1 varchar(3) not null
Expected column
column1 varchar(3) null
Mudassar

Shridar I havent defined it but the derived column has been picked up as not null which is strange
CREATE VIEW test
AS
SELECT
CASE
WHEN COMPANY_SIZE IS NULL then 'a'
ELSE 'b'
END AS
column1 ----- added derived column identifier
,[Company_Size] AS [CompanySize]
FROM xyz
Mudassar

Column definition for a specific column in a view

Is there a way to query the metadata to get the definition of a single column in a view? I can see the complete DDL for a view from USER_VIEWS.TEXT, and I can see the column listing in USER_TAB_COLUMNS to give the datatype etc. However, what I'm looking for is the DDL that defined a specific column.
So, given:
create table PERSON (
SSN VARCHAR2(12),
FIRST_NAME VARCHAR2(25),
LAST_NAME VARCHAR2(25),
STREET VARCHAR2(40),
CITY VARCHAR2(30),
STATE VARCHAR2(30),
ZIP VARCHAR2(15),
COUNTRY VARCHAR2(35))
create view PERSON_VW as
select SSN,
FIRST_NAME,
LAST_NAME,
FIRST_NAME || ' ' || LAST_NAME FULL_NAME
from PERSON
I expect the query might look something like:
select DDL from metadata where table_name = 'PERSON_VW' and column_name = 'FULL_NAME'
and the result would be: "PERSON.FIRST_NAME || ' ' || PERSON.LAST_NAME"
or select DDL from metadata where table_name = 'PERSON_VW' and column_name = 'FIRST_NAME'
and the result would be: "PERSON.FIRST_NAME"
Thanks!

>
Hi again Barry,
When I queried user_tab_columns (or dba_tab_columns or all_tab_columns), I have the following list of columns:
TABLE_NAME
COLUMN_NAME
DATA_TYPE
DATA_LENGTH
DATA_PRECISION
DATA_SCALE
NULLABLE
COLUMN_ID
DEFAULT_LENGTH
DATA_DEFAULT
I don't see anything resembling the DDL for the view column. Somewhere underneath some
cover I haven't peeked under, Oracle must be keeping track of what it is supposed to be giving
for, in my example, FULL_NAME.Unless I'm very much mistaken, these columns' data (per table) looks pretty much like DDL to me.
Maybe what you need is just SQL Developer (great tool, if you don't have it, get it!).
And it's free (as in beer - not as in speech! :( )
Beside the connections tab is a "Reports" tab with various, as you might expect ;), reports.
One of them is on the Tables - with (some) DDL. This will work as a once-off if that's what
you need?
Otherwise there's the SQL tab if you open a table under connections - it's very complete - sample
at bottom of post.
HTH,
Paul...
(Ultimately, I'm diagnosing problems in existing databases that have views already created so
I don't have the option of considering virtual columns.)Quelle surprise ;(
Paul...
-Barry
CREATE TABLE "HR"."COUNTRIES"
    "COUNTRY_ID"   CHAR(2 BYTE) CONSTRAINT "COUNTRY_ID_NN" NOT NULL ENABLE,
    "COUNTRY_NAME" VARCHAR2(40 BYTE),
    "REGION_ID"    NUMBER,
    CONSTRAINT "COUNTRY_C_ID_PK" PRIMARY KEY ("COUNTRY_ID") ENABLE,
    CONSTRAINT "COUNTR_REG_FK" FOREIGN KEY ("REGION_ID") REFERENCES "HR"."REGIONS" ("REGION_ID") ENABLE
ORGANIZATION INDEX NOCOMPRESS PCTFREE 10 INITRANS 2 MAXTRANS 255 LOGGING STORAGE
    INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT
TABLESPACE "USERS" PCTTHRESHOLD 50;
COMMENT ON COLUMN "HR"."COUNTRIES"."COUNTRY_ID"
IS
'Primary key of countries table.';
COMMENT ON COLUMN "HR"."COUNTRIES"."COUNTRY_NAME"
IS
'Country name';
COMMENT ON COLUMN "HR"."COUNTRIES"."REGION_ID"
IS
'Region ID for the country. Foreign key to region_id column in the departments table.';
COMMENT ON TABLE "HR"."COUNTRIES"
IS
'country table. Contains 25 rows. References with locations table.';

How can I add a new column to Grid view under Tests tab

I understand in "ORACLE Test manager for web Applications", the Grid view under Tests tab should be customised.
How can I add a new column to Grid view under Tests tab? Thanks Katherine

I don't think this is possible.
Regards,
Jamie

Times missing in left column in week view

I am using iCal 2.0.3 and the hour times to not show in the left column in week view. Noon is present, but no others. There have been a few occasions that times have shown up, but then the next time they are gone. I set up a new user and went into iCal and the dates show. All my prefs are the same in my account and the "new user".
I am suspecting that there is corrupted prefs file of some sort, but I am reluctant to just delete files without knowing which one. Since I installed 10.4 a few months ago, I have found a lot of settings changed that upgrades should have kept intact in preferences.
Any suggestions?

no responses
posting again

Custom column in List view

Dear guru's,
I'd like to ask you if its possible to add custom column in list view. For example in tc. FBL1N I'd like to add a column with custom text (for example with value "1" for counting the sum of rows). Is it possible to do without creating custom program?
Thank you all.
Regards.
Michael.

Hi Michael,
It's not possible to add some extra text in standard out-put without modifying it or creating custom program.
For adding a column in your list view. I think this write statement will help you
WRITE 'You can overwrite the following line:'.
FORMAT INPUT ON INTENSIFIED OFF.
WRITE 'WRITE HERE'.
FORMAT INPUT OFF INTENSIFIED ON.

Hide a column in one view, but show in other

Hi all.
I need to hide a column on "Table" view, but column needs to show up on "Pivot table".
I know we can hide it on pivot ( exclude It ) and show on table, but I want to know if reverse is possible.
This is needed because I am doing a view selector for writeback. And I dont want to display all the columns on writeback table view. But it needs to be there on Pivot table.
Please let me know if it is possible.
Thanks.
Vinay

Yes we can do that.
Check on the "Hide" in the column format tab of the column that you need to display in the table lay out.
Now dupliate the same view and in the pivot table column intially you will not see the column displayed.
Now in the properties check on "hidden" in the "format headings" and you wont see it still and now uncheck the"hidden" and you shoud be able to see the column displayed in the pivot view
In this way you will have the column hidden in the table view and displayed in the pivot table.
Hope it helps
Prash

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.

Finding source database table/column name for a column in a view

Hi i need to be able to identify the original database table/column name for a column in a view.
e.g. say i have a view like this
create v1 as select a.name fname, b.name bname, c.name cname,......
from u1.names a, u2.names b. u3.names c
where .....
Now I want to find out that the database table/column name for the fname, bname and cname columns in the view v1, which in this instance is u1.name.name, u2.names.name, u3.names.name.
But i need to be able to do it for any view. Short of parsing the SQL is there an easy way of doing this?
Now obviusly I can't do this for virtual columns but I will know my column is not virtual as it has an index on it.

But i need to be able to do it for any view. Short of
parsing the SQL is there an easy way of doing this?No, parsing the SQL is the only way. Good luck it is not something I would want to attempt.

Max number of columns in a Webi report

In a worst-case scenario test, I requested about 1700 columns in a Webi report, but only a little more than 300 appeared in the SQL; a TOAD request for the same 1700 columns was successful. Is there an upper limit for the number of objects that can appear in a Webi report? Is there a parameter that could increase the limit?

My eyes read the first half and my brian assumed the second half.
I dont think there is a limitaion on the number of objects that a WebI report can pull.
The only limitation I know of is the maximum number of column that you can display in the report panel; the max number is 100,000.
With the limit on the max number of column diplay in a WebI report can be translated into the max number of columns in the query panel.
This setting is in CMC> Applications>Web Intelligence-->Quick Display mode

Max No. of columns returned in Query Template

Hi All,
Is there any limit to the max number of columns that can be returned for a sql query using the Query Template?
Regards,
Arijeet

Hi Rick,
I am basically querying a database table which has a large number of columns. Of which I need only a few. Unfortunately though some of the columns I need are not in those that are shown by default when I do a SELECT * or in the list of columns that show up in the Query Template. I am using UDS to connect to the other system and when I try to SELECT the columns which are of interest to me the connection is reset and the UDS Instance for that connection stops. I could access all the columns in the BLS so I am presently using a work around by running an xacute query to show me the data.
Regards,
Arijeet

Max no of columns in a view

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