Oracle-L: Re:RE: Lost a redo disk

From: <dgoulet_at_vicr.com>
Date: Wed, 20 Feb 2002 08:03:39 -0800
Message-ID: <F001.00414555.20020220080339@fatcity.com>

Tom,

It would appear that Beth hit the right solution in the end. In the past when I've lost a redo log it was the active one which makes for a much bigger mess. What I believe Beth was running into is that when the database opens it tries to connect with each file that makes up the database. If it can't then the open stops right there & complains. In her case the first task was to point to a disk drive that's available in the first place. Rebuilding the control file has the same effect, it's just that you can 'rename' the missing log all in one step. And true issuing a reset logs command does clear out all of the online redo.

Dick Goulet

____________________Reply Separator____________________
Author: "Mercadante; Thomas F" <Thomas.Mercadante_at_Labor.State.Ny.Us>
Date:       2/20/2002 10:58 AM

Dick,

Couldn't she just

"Alter database open reset logs" - wouldn't this create a new set of redo logs?

Beth - you didn't say whether you lost all of your redo logs - please do NOT do the above right away. I've never faced this, and am guessing a bit.

Tom Mercadante
Oracle Certified Professional

-----Original Message-----
Sent: Wednesday, February 20, 2002 9:03 AM To: Multiple recipients of list ORACLE-L

Beth,

This is one of those conditions where not backing up everything gets one in
trouble, on occasion. What I believe you'll have to do, which would be true in
any case, is rebuild the control file. Now I'm not absolutely certain, but I do
believe you can issue a "alter database backup controlfile to trace" command on
a mounted database. That will at least give you the script you'll need.

Dick Goulet

____________________Reply Separator____________________
Author: "Seefelt; Beth" <Beth.Seefelt_at_TetleyUSA.com>
Date:       2/20/2002 5:28 AM

Hi everybody,

This all started with the halon firing in our data center last night around 10pm
so you can imagine my condition.

I lost a disk that contained only redo logs.

When I try to open the database I get

ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: 'F:\ORACLE\ORADATA\OWBREPOS\REDO01.LOG'
ORA-27041: unable to open file
OSD-04002: unable to open file

I thought what I needed to do was switch the log files, drop the members that
are on the bad disk, and then I'd be able to open the database.

So I mounted the database and did

alter system switch logfile;

and its telling me ORA-01109: database not open

I thought I could swicth logfile with the database mounted?

Could someone suggest the right steps I should take to recover?

Many TIA,

Beth
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Author: Seefelt, Beth
INET: Beth.Seefelt_at_TetleyUSA.com

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Author:
INET: dgoulet_at_vicr.com

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