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

From: Bhaskar Viswanathan <bhaskar.viswanathan_at_wipro.com>
Date: Thu, 12 Jun 2003 03:01:37 -0700
Message-ID: <F001.005AFEAD.20030612022953@fatcity.com>

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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Author: Bhaskar Viswanathan
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