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

Bhaskar,

Wisely you chose to take 30 char limit in your stride but I'm sure the "name translation algorithm" suggestion was intended as a joke and so was "doing away with DDL".

Don't make things overly complicated. Have good naming conventions and shorten the name wherever wise. Name translation is going to make more problems than name abbreviation. Can you give a brief of what problems you anticipate by shortening the names?

Agreed, that 30 chars is a bit too mean, but thats the way it is. So better learn to live with it rather than doing fancy things with a DB.

Regards
Naveen
> -----Original Message-----
> From: Bhaskar Viswanathan [mailto:[EMAIL PROTECTED]
> Sent: Friday, June 13, 2003 12:59 PM
> To: Multiple recipients of list ORACLE-L
> Subject: 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
> >
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Author: Naveen Nahata
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