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

From: Ganesh Raja <gans_r_at_rediffmail.com>
Date: Thu, 12 Jun 2003 07:28:18 -0700
Message-ID: <F001.005B015F.20030612064420@fatcity.com>


DON'T DO IT !!!!! 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...

DON'T DO IT !!!!! Best Regards,
Ganesh R
DID : +65-6215-8413
HP : +65-9067-8474



Live to learn... forget... and learn again.

-----Original Message-----

Bhaskar Viswanathan
Sent: Thursday, June 12, 2003 9:20 PM
To: Multiple recipients of list ORACLE-L

Hi Senthil,

One thing I can see is that this object col is not a user-defined table. Probably a system table.

I tried "alter table col modify cname varchar2(60)" *
ERROR at line 1:
ORA-00942: table or view does not exist

But the object exists as I am able to do a select on it.

Please send me the procedure. I will try it out!

baski

-----Original Message-----

Sent: Thursday, June 12, 2003 5:05 PM
To: Multiple recipients of list ORACLE-L

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

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Received on Thu Jun 12 2003 - 09:28:18 CDT

Original text of this message

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