RE: Re-creating control files with larger maxdatafile setting

From: K Gopalakrishnan <kaygopal_at_yahoo.com>
Date: Thu, 19 Sep 2002 01:09:16 -0800
Message-ID: <F001.004D3353.20020919010916@fatcity.com>

Not quite true. Starting from Oracle8 you don't need to recreate the controlfile to increase the MAXDATAFILES parameter.

You can just change the db_files and bounce the server.

KG

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

Khanna
Sent: Thursday, September 19, 2002 1:43 AM To: Multiple recipients of list ORACLE-L

KG,

It will not help just by increasing the db_files parameter in the Init.ora file. Whenever you need to change MAXDATAFILES,MAXLOGFILES,MAXLOGMEMBERS for your database the change is to recreate the control file and then mount and open the database.

What needs to be done is :

Svrmgr> Alter database backup controlfile to TRACE; This would generate an ASCII text based file at the location defined by USE_DUMP_DEST in your init.ora. Edit that file in any text editor and chane the Value of MAXDATAFILES (in your case). Save the file with some name at a particular destination.eg C:\Controlfile\Control.Sql

SVRMGR> Shutdown immediate;
Instance Shutdown.
SVRMGR>Startup Nomount;
Instance Started.
SVRMGR>@C:\Controlfile\Control.Sql;
Statement Processed.
SVRMGR> Alter database mount;
Database Mounted.
Svrmgr> Alter database open;
Database opened.

Now you can create the new datafiles to expand your database. Never the parameter db_files can be more that the MADATAFILES declared in your controlfile;

Thanks
Vikas Khanna

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

Sent: Thursday, September 19, 2002 1:28 PM To: Multiple recipients of list ORACLE-L

George:

If you want to recreate the controlfile **just to ** increase the max datafiles, you can simply increase the db_files parameter and bounce the database. This will automatically chance the max datafiles settings when you create the additional datafiles.

KG

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

Leonard (ZA)
Sent: Thursday, September 19, 2002 12:13 AM To: Multiple recipients of list ORACLE-L

Hi all

Does someone maybe have a step by step guide to re-creating the control files. I have found that one the my databases the maxdatafiles has been set to small, would like to increase it now.

thx

George

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Author: Vikas Khanna
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Author: K Gopalakrishnan
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