RE: db file sequential read [WAS:wait event puzzler]

Hi,

Thanks to all for you responses.

To sum up the suggestions:

1. You can modify col$.NAME to varchar2(60) and try......
2. I do agree with you. But some times we may need go beyond the scopes. For testing purpose we can do these kind of R&D's.(alterning the col.Cname size) Nothing wrong in this.
3. That is a Very Good Idea... We will do away with DDL Stmts will start writing directly into the Data Dictionary ...
4. Oracle does not support column names that are longer than 30 characters. This is a hard standard and can not be changed.
5. Ur not supposed to Update Data Dictionaly Tables Directly ... Oracle has A Limit of 30 Chrs and is Hardcoded.. So ReName your Columns within 30 Chrs...
6. Updating a data dictionary is simply not done. Remember, we're the DBA (you will be assimilated) and not fun loving students who can play with their alma mater's equipment. Updating the data dictionary directly would cause the database to lose support from Oracle Corp. and the perpetrator would be liable.
7. telling him to do a Update on COL$... He Ends up Doing that in his Production Database.. And he is going to be in a HOT soup....
8. Write a compress / decompress algorithm that will take your 200-character table names from the application and pass them to the database as <= 30 characters; then uncompress them from the database back to the application.
9. references to DB naming conventions.

I would want to go with the majority. "Do not Do it!!!!!!".

But then, the problem is like, I cannot afford to shorten names as there are a lot of other problems which crops up. Though right now, thatz what we do and which is what I am attempting to avoid.
Ofcourse, the suggestion to have an algo. translate the names is a good one, which is thought of and is the current Decision.

Whew!, if oralce supports more than 30 characters for column names, life would be easier.

Can somebody explain in brief, why this is being restricted to 30 characters?

And once again, thanks a lot!

Baski

-----Original Message-----
Sent: Thursday, June 12, 2003 7:10 PM
To: Multiple recipients of list ORACLE-L

Modifying data dictionary tables is definitely not a good idea and I am sure Oracle will not support this.

CP

[EMAIL PROTECTED] wrote:

>Dear Bhaskar,
>
>You can modify col$.NAME to varchar2(60) and try.
>
>If this fails, I'll give a procedure you can use that to change it to
>whatever size you want.
>
>Senthil Kumar
>Sr Oracle DBA
>Summitworks Technologies Pvt Ltd
>
>-----Original Message-----
>Bhaskar Viswanathan
>Sent: Thursday, June 12, 2003 4:00 PM
>To: Multiple recipients of list ORACLE-L
>
>
>
>hi,
>
>We use Oracle 8 DB.
>
>I am not a Oracle technical guy. So lemme try explaining the problem.
>
>We need to create tables with columns, whose names(column-names) are
>more than 30 characters long. This is being restricted because, all
>columns of all tables have entries in a table called 'col'.
>Thit table is defined as:
>
>SQL> desc col
> Name Null? Type
> ----------------------------------------- --------
>----------------------------
> TNAME NOT NULL VARCHAR2(30)
> COLNO NOT NULL NUMBER
> CNAME NOT NULL VARCHAR2(30)
> COLTYPE VARCHAR2(106)
> WIDTH NOT NULL NUMBER
> SCALE NUMBER
> PRECISION NUMBER
> NULLS VARCHAR2(19)
> DEFAULTVAL LONG
> CHARACTER_SET_NAME VARCHAR2(44)
>SQL>
>
>since CNAME is defined as VARCHAR2(30), we are forced to retrict column

>names to a max of 30 characters long.
>
>For eg. create table T1(xxxxxxxxxxxxxxxxxxxxxxxxxxxxx31 varchar2(50));
>The above statement will be rejected with the error:
> *
>ERROR at line 1:
>ORA-00972: identifier is too long
>
>However, the statement "create table T1(xxxxxxxxxxxxxxxxxxxxxxxxxxxx30
>varchar2(50))" Succeeds in creating the table;
>
>I guess this table col is created by the system itself. how can we
>change this size So that the 30 character restriction in column names
>can be avoided???
>
>baski
>
>**************************Disclaimer***********************************
>*
>
>Information contained in this E-MAIL being proprietary to Wipro Limited

>is 'privileged' and 'confidential' and intended for use only by the
>individual or entity to which it is addressed. You are notified that
>any use, copying or dissemination of the information contained in the
>E-MAIL in any manner whatsoever is strictly prohibited.
>
>***********************************************************************
>****
>--
>Please see the official ORACLE-L FAQ: http://www.orafaq.net
>--
>Author: Bhaskar Viswanathan
> INET: [EMAIL PROTECTED]
>
>Fat City Network Services -- 858-538-5051 http://www.fatcity.com
>San Diego, California -- Mailing list and web hosting services
>---------------------------------------------------------------------
>To REMOVE yourself from this mailing list, send an E-Mail message
>to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the

>message BODY, include a line containing: UNSUB ORACLE-L (or the name of

>mailing list you want to be removed from). You may also send the HELP
>command for other information (like subscribing).
>
>
>

-- 
Your favorite stores, helpful shopping tools and great gift ideas. 
Experience the convenience of buying online with [EMAIL PROTECTED] 
http://shopnow.netscape.com/


-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: CP
  INET: [EMAIL PROTECTED]

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services
---------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the
message BODY, include a line containing: UNSUB ORACLE-L (or the name of
mailing list you want to be removed from).  You may also send the HELP
command for other information (like subscribing).

**************************Disclaimer************************************

Information contained in this E-MAIL being proprietary to Wipro Limited is 
'privileged' and 'confidential' and intended for use only by the individual
 or entity to which it is addressed. You are notified that any use, copying 
or dissemination of the information contained in the E-MAIL in any manner 
whatsoever is strictly prohibited.

***************************************************************************
-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Bhaskar Viswanathan
  INET: [EMAIL PROTECTED]

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services
---------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).