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icon5.gif  pfile and control file query [message #309962] Sun, 30 March 2008 13:39 Go to next message
oraclesavvy
Messages: 9
Registered: May 2007
Junior Member


Hello,

If database is running and suppose pfile and control file dropped accidentally then will database continue to run?

Please answer with explanation.
Re: pfile and control file query [message #309965 is a reply to message #309962] Sun, 30 March 2008 13:56 Go to previous messageGo to next message
varu123
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Registered: October 2007
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yes until oracle accesses control file on need.
Re: pfile and control file query [message #309966 is a reply to message #309962] Sun, 30 March 2008 13:58 Go to previous messageGo to next message
Michel Cadot
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A couple of seconds.

Regards
Michel
Re: pfile and control file query [message #310072 is a reply to message #309962] Mon, 31 March 2008 03:13 Go to previous messageGo to next message
Arju
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If pfile missing while operation then no effect on database. It continue it's own work. If controlfile missing while database operation within few seconds abnormally shut down the database.
Re: pfile and control file query [message #310085 is a reply to message #309962] Mon, 31 March 2008 03:59 Go to previous messageGo to next message
varu123
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Does oracle access control file all the time?

If oracle is idle ie no activity is going on,then also oracle will shutdown?
Re: pfile and control file query [message #310090 is a reply to message #310085] Mon, 31 March 2008 04:48 Go to previous messageGo to next message
Michel Cadot
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Oracle is never idle. It always does many things in background.
Yes, control file is often accessed.

Regards
Michel
Re: pfile and control file query [message #310094 is a reply to message #309962] Mon, 31 March 2008 05:00 Go to previous messageGo to next message
varu123
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Registered: October 2007
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Yes, control file is often accessed.


So until it is accessed, the database would run as normal.
Re: pfile and control file query [message #310104 is a reply to message #310094] Mon, 31 March 2008 05:30 Go to previous messageGo to next message
Michel Cadot
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Yes.

Until you realize you have no more ground under your feet you can continue to walk. Smile

Regards
Michel
Re: pfile and control file query [message #310112 is a reply to message #310104] Mon, 31 March 2008 05:36 Go to previous messageGo to next message
ThomasG
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Quote:

Quote:

Yes, control file is often accessed.


So until it is accessed, the database would run as normal.



Which is also true for the data files, the program binaries, etc..., I presume. When they are gone the database would run as normal until they are accessed. Grin
Re: pfile and control file query [message #310238 is a reply to message #309962] Mon, 31 March 2008 12:20 Go to previous messageGo to next message
varu123
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Registered: October 2007
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Quote:
Which is also true for the data files, the program binaries, etc..., I presume. When they are gone the database would run as normal until they are accessed


but the information of datafiles/binaries are fetched from control files itself.

So its all control files that control the behaviour of database.
Re: pfile and control file query [message #310240 is a reply to message #310238] Mon, 31 March 2008 12:22 Go to previous messageGo to next message
Michel Cadot
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Data are fetched from/written to datafiles and not control file.

Regards
Michel
Re: pfile and control file query [message #310241 is a reply to message #309962] Mon, 31 March 2008 12:30 Go to previous messageGo to next message
varu123
Messages: 754
Registered: October 2007
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but wouldn't at the same time data dictionaries are also updated and these dictionaries fetch data about datafiles from control files.



Re: pfile and control file query [message #310244 is a reply to message #310241] Mon, 31 March 2008 12:41 Go to previous messageGo to next message
Michel Cadot
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No, nothing is fetched from control file during database normal session.
Dictionary is not in control file, it is in data files (SYSTEM tablespace).

Regards
Michel
Re: pfile and control file query [message #310315 is a reply to message #309962] Mon, 31 March 2008 22:45 Go to previous message
Arju
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Quote:
Which is also true for the data files


Quote:
When they are gone the database would run as normal until they are accessed


Even after being accessed database will run as normal except the objects in the datafiles itself.
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