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backup concept(user managed) [message #289472]

Sat, 22 December 2007 02:52

Vivek.k.thakur
Messages: 30
Registered: December 2007
Location: DELHI, INDIA

Member

Dear all,
hi! plese tell me , when we fire command ALTER TABLESPACE ........BEGIN BACKUP, oracle server freeze the header of the data file, simultaneously users applying DML's on it, where the server process writes ? some people say it updates datafile and some says, that this information is written in log files. I am totally confuse about this concept. Please tell me that how this processing accomplishes. And which oracle background process does perfom these all activities. Means which one background process freeze the header.

Thanks
Vivek Kumar

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Re: backup concept(user managed) [message #289473 is a reply to message #289472]

Sat, 22 December 2007 03:13

Michel Cadot
Messages: 68718
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

Quote:

where the server process writes ?

In datafiles.

Quote:

it updates datafile and some says, that this information is written in log files.

Choose the one you will trust.
By the way, Oracle ALWAYS writes modifications in log files. This is the purpose of log files.
In backup mode, Oracle writes the whole block in log files the first time you modify it (after putting the file/tablespace in backup mode), then it writes only the modifications as always.

Quote:

which oracle background process does perfom these all activities.

Writes are usely done by DBWR unless these are direct writes, in this case they are done by those who make direct writes.

Quote:

which one background process freeze the header.

No background process, this is you when you execute the "begin backup".

All is in Database Concepts

Regards
Michel

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Re: backup concept(user managed) [message #289474 is a reply to message #289472]

Sat, 22 December 2007 03:17

Mohammad Taj
Messages: 2412
Registered: September 2006
Location: Dubai, UAE

Senior Member

http://www.orafaq.com/wiki/User_Managed_Online_Backups
http://www.dizwell.com/prod/node/10
http://www.fortunecity.com/skyscraper/oracle/699/orahtml/oracle/10bullet.html

hope this help

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Re: backup concept(user managed) [message #289475 is a reply to message #289473]

Sat, 22 December 2007 03:26

Vivek.k.thakur
Messages: 30
Registered: December 2007
Location: DELHI, INDIA

Member

Thank you very much sir.

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Re: backup concept(user managed) [message #289651 is a reply to message #289472]

Mon, 24 December 2007 21:26

ora_zhp
Messages: 10
Registered: September 2007

Junior Member

http://www.dizwell.com/prod/node/10

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