Oracle10g - please help me!!!!

hi,
please help me about the following doubts regarding oracle 10g
1) why SCN is updated even if there are no transactions done?
2) even after removing the DBF, its showing data, how?
3) why it takes time when we switch b/w logs... and sometimes its beeing fast and taking time sometimes... ?

user10526853 wrote:
hi,
please help me about the following doubts regarding oracle 10g
1) why SCN is updated even if there are no transactions done?Well, you need to understand one thing first that SCN is not going to just increase with the transacton being present . SCN is oracle's way to implement time and time is always increasing. So in that way, SCN is also increasing as well. In Oracle. every read has to be consistent so each statement, be it whatever, needs to check that its reading the consistent data only. So with each read too, you issue a request for the most recent SCN and thats also one reason that you would find that even with the statements too, its increasing. The other reason , which Navneet mentioned ,. there is always some thing going on so that again would call for the increaes of the scn.
2) even after removing the DBF, its showing data, how?Its good to mention the o/s when you ask question like this. What you are saying is not possible over windows but only over nix based systems.  The reason is that at times, in nix systems, even though the file is given for a delete. the process doesn't release the inode of the file and Oracle still assumes that its there. The other reason can be that the data that you are selecting is in the cache and deleting a file from the oi/s doesn't flush its data from the cache. So it may happen that you are getting data selected from the cache.
3) why it takes time when we switch b/w logs... and sometimes its beeing fast and taking time sometimes... ?Some times we reach office early and some times , we get traffic jams, can you tell when what happens? You start for the office early, no traffic is there. You get to the office early. You woke up late( thanks to the late night party) and now you are starting on the peak time, you would get more delayed. The same is true for switching part too. The redo log file, on which you are switching needs to be empty before you switch over it and it would be empty only after the checkpointing of its data is over by DBWR. The more the data is , the more time dbwr would take. Or the more faster you try to come back to the file due to small size of it, the more early you would request for the file and would get delayed in gettnig it as the file might still getting checkpointed.
HTH
Aman....

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    Thread : SAPEngine_Application_Thread[impl:3]_32
    Datasource : 1666450:/apps/usr/sap/HLG/JC00/j2ee/cluster/server0/log/defaultTrace.trc
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         at com.sap.tc.webdynpro.progmodel.view.ViewManager.init(ViewManager.java:155)
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         at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessingStandalone(ClientSession.java:713)
         at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessing(ClientSession.java:666)
         at com.sap.tc.webdynpro.clientserver.session.ClientSession.doProcessing(ClientSession.java:250)
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         at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:62)
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