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Long transactions [message #356126] Wed, 29 October 2008 12:44 Go to next message
danyromimd
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Registered: August 2008
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Hi!

I've got a question...
How does online redo logfiles work when there is a long transaction?
Are they written to archived redo logs as they get full or they wait for the transaction to end?
If they wait for the transaction to end... How does the database react if it runs out of redo logfiles?

Thanks a lot!

Daniela.

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Re: Long transactions [message #356133 is a reply to message #356126] Wed, 29 October 2008 13:09 Go to previous messageGo to next message
Michel Cadot
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They are written to archived logs.

Regards
Michel

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Re: Long transactions [message #356141 is a reply to message #356126] Wed, 29 October 2008 13:29 Go to previous messageGo to next message
danyromimd
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Thanx!!

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Re: Long transactions [message #379946 is a reply to message #356126] Thu, 08 January 2009 10:19 Go to previous messageGo to next message
danyromimd
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... and what happens if it needs to rollback a transaction that at some point had to be written to archived logs?

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Re: Long transactions [message #379950 is a reply to message #379946] Thu, 08 January 2009 10:28 Go to previous messageGo to next message
Michel Cadot
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Rollback marker is written in redo log, that's all.

Regards
Michel

[Updated on: Thu, 08 January 2009 10:28]

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Re: Long transactions [message #379952 is a reply to message #356126] Thu, 08 January 2009 10:30 Go to previous messageGo to next message
danyromimd
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Oh! Great!!

Thank you!!
Daniela.

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Re: Long transactions [message #379954 is a reply to message #379952] Thu, 08 January 2009 10:49 Go to previous messageGo to next message
Michel Cadot
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Well, when I say that's all, that's all from the point of view of redo logs but of course all modifications are undone in the data blocks (and also rollback header is updated to indicate that the transaction completed and those kind of things).

Regards
Michel

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Re: Long transactions [message #379955 is a reply to message #356126] Thu, 08 January 2009 10:54 Go to previous messageGo to next message
danyromimd
Messages: 73
Registered: August 2008
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And how does it work when logs are applied to the Standby db?

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Re: Long transactions [message #379956 is a reply to message #379955] Thu, 08 January 2009 11:04 Go to previous message
Michel Cadot
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When it sees the rollback marker, Oracle applies the rollback data to undo modifications in data blocks as it did it in primary.

Regards
Michel

[Updated on: Thu, 08 January 2009 11:10]

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