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Home -> Community -> Mailing Lists -> Oracle-L -> Temporarily Renaming the sgadefSID.dbf File
Hi All,
Trying to clone our PROD to a test database on the same machine for testing our 734-->8i upgrade, and of course we're encountering the "can't-start-the-new-without-shutting-down-the-old" database problem (ie, ORA-9782 on the CREATE CONTROLFILE command). We've worked around this in the past by scheduling a time to bring down PROD.
I know that this is the safest, most reliable way (besides NOT doing this on a production box...but I have no choice), but believe it or not, I actually saw a reference on a Metalink forum to rename the sgadefSID.dbf file, start up the new database, then rename the file to its original name. Obviously sgadef gets created at instance startup as a memory map, but it doesn't look like it's used for anything after that (it's certainly doesn't seem to be written to). I do know that you can get an octal dump of the file to determine the shared memory ID for whatever reason.
Everything else I've heard/seen about this file has pretty much said DON'T TOUCH IT!!! But if the instance only uses it at instance startup, is there any harm in renaming it temporarily to get the other database up? If so...why?
And have any of you tried renaming or deleting the file in your cloning (or other) efforts? Did it blow up, or work?
TIA,
Steve
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Author: Morrow, Steve
INET: SMorrow_at_admin.usf.edu
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