To where does the LGWR write information in redo log buffer ?

Suppose my online redo logfiles are based on filesystems .I want to know to where the LGWR writes information in redo log buffer ? Just write to filesystem buffer or directly write to disk ? And the same case is associated with the DBWR and the datafiles are based on filesystems too ?

It depends on the filesytem. Normally there is also a filesystem buffer too, which is where LGWR would write.Yes but a redo log write must always be a physical write.
From http://asktom.oracle.com/pls/ask/f?p=4950:8:15501909858937747903::NO::F4950_P8_DISPLAYID,F4950_P8_CRITERIA:618260965466
Tom, I was thinking of a scenario that sometimes scares me...
**From a database perspective** -- theoretically -- when data is commited it
inevitably goes to the redo log files on disk.
However, there are other layers between the database and the hardware. I mean,
the commited data doesn't go "directly" to disk, because you have "intermediate"
structures like i/o buffers, filesystem buffers, etc.
1) What if you have commited and the redo data has not yet "made it" to the redo
log. In the middle of the way -- while this data is still in the OS cache -- the
OS crashes. So, I think, Oracle is believing the commited data got to the redo
logs -- but is hasn't in fact **from an OS perspective**. It just "disapeared"
while in the OS cache. So redo would be unsusable. Is it a possible scenario ?
the data does go to disk. We (on all os's) use forced IO to ensure this. We
open files for example with O_SYNC -- the os does not return "completed io"
until the data is on disk.
It may not bypass the intermediate caches and such -- but -- it will get written
to disk when we ask it to.
1) that'll not happen. from an os perspective, it did get to disk
Message was edited by:
Pierre Forstmann

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"THorner" <[email protected]> wrote in message
news:B4D7B3CBF165D311844100C04F4E3E1B031246@DANCERACE01...
If you are using WLS5.1 you much set the property
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-----Original Message-----
From: Bill Ralenkotter [mailto:[email protected]]
Posted At: Thu 03 May 2001 16:00
Posted To: weblogic.developer.interest.security
Conversation: Where does the logging in RDBMSRealm go and are some
JavaDocs missing?
Subject: Where does the logging in RDBMSRealm go and are some
JavaDocs missing?
I see that a LogOutputStream is created in the example
class RDBMSRealm, but where do all of the log
statements go. The LogOutputStream is created as:
log = new LogOutputStream("RDBMSRealm");
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I do not see the log statements on stdout.
BTW, I do have logging set to the most detailed
level (Info) from the console if this matters.
Also, are there some JavaDocs missing from
Weblogic's Reference website at
http://edocs.bea.com/wls/docs60/javadocs/index.html
LogOutputStream is an example. I do not see the
class when I select the package
weblogic.logging.
Where is it?
Much Thanks
Bill Ralenkotter.

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To where does the LGWR write information in redo log buffer ?

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