Oracle10g - please help me!

Hello

Please help me about the following doubts regarding oracle 10 g

(1) why SNA is updated even if there is no transaction?
(2) even after the removal of the DBF, its display of data, how?
(3) why it takes time when going from newspapers n/b... and sometimes its beeing fast and taking in time sometimes...?

user10526853 wrote:
Hello

Please help me about the following doubts regarding oracle 10 g

(1) why SNA is updated even if there is no transaction?

Well, you need to understand something first that SNA does not simply increase with the transaction being present. CPN is average Oracle to put implementation of the time and is still increasing. If in this way, YVERT also increases as well. In Oracle. each reading must be consistent if every statement, either, whether you should check that its reading of the consistency of the data only. So, with each reading too, you issue a request for the latest RCS and it is also one of the reasons that you would find that even with the statements too, its increase. The other reason, which Navneet mentioned. There is always something going on, so that would be called again for the CPN increaes.

(2) even after the removal of the DBF, its display of data, how?

Its good to mention the o/s when you ask the question like that. What you say is not possible on nix systems based on windows but only on .  The reason is that sometimes, in nix systems, even if the file is given for a deletion. the process does not release the inode of the file and Oracle always assumes that its there. The other reason might be that the data that you select is in the cache and remove a file from the IO/s empty its cache data. It may happen that you have found data selected from the cache.

(3) why it takes time when going from newspapers n/b... and sometimes its beeing fast and taking in time sometimes...?

A few times we arrive office early and a few times we get traffic jams, can you tell when what happens? You start the office early, no traffic is here. Get to the office early. You woke up late (thanks to the part of late night), and now you start on rush hour, you would get more delayed. It goes same for switching part too. The log again, on which you spend must be empty before you switch on him and it would be empty once the script to check its data by DBWR. The more the data, would take the dbwr more time. Or faster, you try to get back to the file due to the small size of it, before you ask for the file and even get delay in gettnig file might still get controlled.

HTH
Aman...

Tags: Database

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