Max.No. of columns a table can have in oracle9i db.10g?

wat is the maximun no. of columns a table can have in the oracle database
version 9i. and in the version oracle 10g.

Limit is 1000 for both versions
http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96536/ch44.htm#288033
http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14237/limits003.htm

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What's the max number of columns a table can have on 32 bit OS & 64 bit OS

What is the max number of columns a table can have on 32 bit OS & 64 bit OS ?
Edited by: sameer naik on 02-Jul-2010 02:11

For TimesTen 7.0 and 11.2.1 releases the limit on the number of columns per table is 1000 for both 32 and 64 bit TimesTen. This can be found in the documentation under System Limits.
Regards,
Chris

Max no of feilds a database table can have?

Hi all,
Can some body tell me Max no of feilds a database table can have?
Thanks a lot - Chandan

Hi Chandan,
You can refer the below link ( check the sub heading constraints).
http://help.sap.com/saphelp_47x200/helpdata/en/cf/21eb6e446011d189700000e8322d00/content.htm
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Why a table can have only one PK ?

Just wanted to know the reason why Oracle allows only one PK per table ?
I came across a situation where my existing large PK which is on a single (ID) column needs an alteration to add a new column (No).
ID column on which PK is based is now subjected to have duplication and that is the reason why i want to add a new column. The new column composition is not going to ensure uniqueness.
So, i need to create (alter) PK on two columns now.
It seems, in order to do that, i need to drop the existing PK and create a new one. Since this is a OLTP production database, business cannot afford to drop the existing pk.
When i tried to create a separate PK on two columns, Oracle gave me below err:
ORA-02260: table can have only one primary keySo, i wanted to understand why Oracle allows only one PK / table ? and considering above err, is there any way to make required changes to my PK without altering existing PK?
(Table is a large 30 GB partition table and PK is a non partitioned global index)
I think PROBABLY i need to drop existing PK and re-create the new one. But core intention for opening this thread is to know rational behind one pk/table concept.

OraDBA02 wrote:
Just wanted to know the reason why Oracle allows only one PK per table ?
It's not exactly Oracle's fault. The ISO SQL standard requires that a "PRIMARY KEY" constraint can only be used once per table. However, a UNIQUE constraint on non-nullable columns achieves effectively the same thing as a PRIMARY KEY. You can have multiple UNIQUE constraints.
Arguably the PRIMARY KEY constraint is unnecessary and could safely be dropped from the SQL language. In principle in the relational model a "primary" key is nothing more or less than a candidate key. All keys are equal in the relational model and there is no fundamental reason to designate a primary key at all. There is certainly no reason not to have multiple keys. In the SQL world though it is a very widely observed convention to use a PRIMARY KEY constraint for each table and to use it for all foreign key references.

Limit on the number of partitions a table can have

Hi,
It's been quite some time I'm thinking of a simple and the best solution to a performance issue in my application. Benefiting out of partitioning the table seems a simplest approach; it involves very minimal changes to my application code and in addition, it keeps the overall application logic 100% intact. However, at times, the number of partitions required can grow to as large as 500 thousand. I know of another application implementing as many as 50 thousand partitions for one of its tables. I'm wondering if Oracle recommends or poses any limit to a number of partitions the table can have. How does that limit, if it exists, vary if each of my table partition holds only a small amount of data; say, not more than 2 thousand records each of 1 KB size. What are the important considerations that one needs to keep in mind while creating the huge number of partitions for a table?
Any inputs on this would be a great help.
Thanks,
Aniruddh
ps: Consider Oracle releases 10g onwards.
Edited by: Aniruddh on Dec 30, 2009 9:46 AM
Edited by: Aniruddh on Dec 30, 2009 9:50 AM

Aniruddh,
>
What are the important considerations that one needs to keep in mind while creating the huge number of partitions for a table?
>
I doubt if you are using partitioning for the right causes. Please explain how is your data structured and why you need to create so many partitions..?
when creating partition, you need to consider..
a) why you need to partition?
b) how is your data structured
c) how your data is indexed.
d) What kind of queries would you firing on this table to get the data. Will they use the partition key ?
Thanks,
Rajesh.
Please mark this/any other answer as helpful or answered if it is so. If not, provide additional details/feedback.
Always try to provide create table and insert statements to help the forum members help you better.

Max number of columns in table for compression

i was told that 256 columns is the max number in a single table for oracle to do compression on table. Can anyone confirm this ?

I can't confirm it off the top of my head but if it is the case then it is documented at http://tahiti.oracle.com you can look it up yourself.
What I do want to weigh in on is the insanity of a table with more than 256 columns. I consider any table with more than 50 columns suspect, more than 100 likely a strong indication that someone understands little about normalization. Anyone contemplating 255+ columns should have their fingers removed from their keyboard by force if necessary.

Is there a max number of actions a button can have?

I'm building an interactive matrix in InDesign (CS5.5 Mac) with stacked buttons to implement the change of state for a given spot on the grid. This is working fine in Acrobat, but when I made a "master reset" button in InDesign (setting 96 buttons to "hidden" and 96 buttons to "visible"), not all of the actions transferred to the button when opened in Acrobat.
My question: is there a limit to the number of show/hide fields a single button can have? If so, I have a pretty good idea how to work around the limit, but want to be sure before proceeding.
Acrobat 9 Pro, Mac OS 10.6.8.
Thanks,
Ben

I highly recommend you do it with a script. Not only you won't have this
issue with the maximum number of actions (which I have no answer for,
sorry), but maintaining it would be MUCH easier and more straight-forward.
Imagine you decide to change the name of one of the fields, or remove it.
You'll have to go over all the actions and find the relevant one. In a
script you could do it in seconds, and it would be much easier to find out
if something went wrong.

How many tables can i create in Oracle 10g ?

hi every body !
how many tables can create in oracle 10g ?
thank you !

Unlimited
http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14237/limits003.htm

Max Number Of Columns in table

We have a requirement, where we need to create 400 columns on one table. Will there be any performance issues with this?
Is there any oracle documentation that can justify this action?
Thank You
Kev

If there is a limit imposed by the software (1000), it should be a limit recommanded by the logical.
You have a RDBMS software here, that means Relational. Relational means tables links.
A table with 400 columns is a nightmare, do not say an horror of conception, and certainly a conceptual error of the business you are working on.
You really should reconsider this fact, and cut your 400 columns in smaller logical pieces (tables).
Nicolas.

Get min and max for a column from table with 24 million rows.

What is the best way to re-write the following query in a procedure for the table which has around 24 million rows?
SELECT MIN(ft_src_ref_id), MAX(ft_src_ref_id )
INTO gn_Min_ID, gn_Max_ID
from UI_PURGE_FT;
Thanks
Edited by: tcode on Jun 21, 2012 12:31 PM

Which of the following plan is better, can you please breifly explain?
Also I need to gather statics to know recursive calls , db block gets ,consistent gets etc. etc. how can I get that?
Thanks
1.
Execution Plan
Plan hash value: 3702745568
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 6 | 13991 (2)| 00:02:48 |
| 1 | SORT AGGREGATE | | 1 | 6 | | |
| 2 | INDEX FAST FULL SCAN | UI_PURGE_FT_PK | 23M| 136M| 13991 (2)| 00:02:48 |
2.
Execution Plan
Plan hash value: 1974183109
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | | 2 (0)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | 6 | | |
| 2 | INDEX FULL SCAN (MIN/MAX)| UI_PURGE_FT_PK | 23M| 136M| 2 (0)| 00:00:01 |
| 3 | SORT AGGREGATE | | 1 | 6 | | |
| 4 | INDEX FULL SCAN (MIN/MAX)| UI_PURGE_FT_PK | 23M| 136M| 2 (0)| 00:00:01 |
| 5 | FAST DUAL | | 1 | | 2 (0)| 00:00:01 |
---------------------------------------------------------------------------------------------

Can I create a view based on two tables that have the same column name?

I have two tables A and B. Each table has 50+ columns.
I want to create a view that includes all the columns in A and all the columns in B. I created a view with a select statement that says
Select A.*, B.*
From A, B
where A.id = B.id
It returns an error because in each table I have a column that keeps track if a record has been changed called Modified_By. That's where it chokes up on I figure. I would like to write the view without explicitly writing each column name from A and B as part of the select statement. The actual select statement works fine and only bombs when trying to turn the select statement into a view.

You will have to type the full column list at least once. You can save a few keystrokes (i.e. alias. on every column) by providing the column names to the CREATE part instead of in the SELECT part. Something like:
SQL> desc t
Name                                      Null?    Type
ID                                                 NUMBER
NAME                                               VARCHAR2(10)
SQL> desc t1
Name                                      Null?    Type
T_ID                                               NUMBER
LOC_ID                                             NUMBER
NAME                                               VARCHAR2(15)
SQL> CREATE VIEW t_v (id, t_name, t_id, loc_id, t1_name) AS
2 SELECT t.*, t1.*
3 FROM t, t1
4 WHERE t.id = t1.t_id;
View created.HTH
John

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

JOIN 2 tables that have same column ?

I need to learn how to join two tables that both have the same column name:
tbl1 - idskey
tbl2 - idskey
the idskey column holds a id_number
When I do the JOIN I would like to make sure that only Distinct records are joined from both tables and that any duplicates are removed in the final join. So if:
Tbl1 has a idskey of: 12345
and
Tbl2 has a idskey of: 12345
In the final JOIN I want to remove one of those duplicates.
I actually need to join 3 tables that have the same linking column names for the join, but if I learn how to do this correctly on 2, that will be a start.
10g for db, thanks!

Hi,
SELECT DISTINCT and GROUP BY are the most common ways to get unique results from non-unique keys. Exactly how you use them depends on exactly what you want to do.
SELECT DISTINCT guarantees that no two rows in the result set, conisdering all columns, will be identical.
GROUP BY produces one row from a set of rows that have a common feature. The values on that row may be a composite of values from various rows in that set (e.g., an average).
Please post a small, specific example. For instance:
"I have two rows in tbl1 ...
and these fhtee rows in tbl2 ...
Notice how there is one row with idskey=12345 in tbl1 but two such rows in tbl2.
How can I get theses results ...
where only one row has idskey=12345?"

How Can i Store photo (image) in column of table

Dear Experts,
I need to store a employee photo in column so how can i do tha same.

This assumes that the images in question currently reside on the database server. If you want to upload images into the database from a client machine, you will need an extra step where you move the files to the appropriate directory or directories on the server. This example will store the images in a BLOB column, rather than a much more flexible interMedia ORDImage column. A BLOB column is fine if you only want to store and retrieve the image, but interMedia gives you significantly more flexibility to manipulate the image, extract metadata, etc.
Create the directory
First, you will want to tell Oracle where it can find the images you want to insert into the database. The easiest way to do this is to create a directory object. In this case, I will be loading images from 'c:\temp\img\'.
CREATE DIRECTORY images AS 'c:\temp\img\'
If you don't have the CREATE DIRECTORY privilege, you will need to have someone else, like your DBA, create the directory and grant you READ access to it.
GRANT READ ON DIRECTORY images TO scott;
Create the Table to Hold the Images
CREATE TABLE images (
image_name VARCHAR2( 100 ),
mime_type VARCHAR2( 100 ),
content BLOB
Create a Stored Procedure to Load the Image
CREATE OR REPLACE PROCEDURE load_image( file_name VARCHAR2 )
AS
file_lob BFILE;
binary_lob BLOB;
mime_type images.mime_type%type;
extension_pos NUMBER;
BEGIN
-- Use the extension of the file name to determing the MIME-type
-- The MIME-type for a .JPG file will be image/jpg
extension_pos := INSTR( file_name, '.' );
mime_type := 'image/' || SUBSTR( file_name,
extension_pos + 1,
LENGTH( file_name ) );
-- Insert a new row into the images table. Get the LOB locator
-- for the newly inserted row-- we will be using that to insert
-- the content from the file.
INSERT INTO IMAGES( image_name, mime_type, content )
VALUES( file_name, mime_type, empty_blob() )
RETURNING content INTO binary_lob;
-- Open up the file in the IMAGES directory named file_name,
-- load that file into the newly created LOB locator, and
-- close the file
file_lob := BFILENAME( 'IMAGES', file_name );
dbms_lob.fileOpen ( file_lob, dbms_lob.file_readOnly );
dbms_lob.loadFromFile( binary_lob,
file_lob,
dbms_lob.getLength( file_lob ) );
dbms_lob.fileClose ( file_lob );
END;
Load the Image
scott@jcave > exec load_image( 'sample.jpg' );
PL/SQL procedure successfully completed.
scott@jcave > column image_name format a30;
scott@jcave > column mime_type format a15;
scott@jcave > column length format 999999;
scott@jcave >
1 SELECT image_name, mime_type,dbms_lob.getLength( content ) length
2 FROM images;
no rows selected
Elapsed: 00:00:00.00
scott@jcave > /
IMAGE_NAME MIME_TYPE LENGTH
sample.jpg image/jpg 9894
Regards
Lakmal

Max columns per tables

H,
What is max number columns per table in database express edition ? I have requirement of creating a table with 100 columns but it seems database only accepts table with 94 columns.any way out ?

Hi Hardy,
Here's a quote from Oracle's SQL documentation:
"The absolute maximum number of columns in a table is 1000. However, when you
create an object table or a relational table with columns of object, nested table, varray,
or REF type, Oracle Database maps the columns of the user-defined types to relational
columns, in effect creating hidden columns that count toward the 1000-column limit."
Where are you seeing the "94 maximum"?
Andy

Max.No. of columns a table can have in oracle9i db.10g?

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