Small Concept Buildup in regard to different Sessions of sqlplus..

Hi,
I am using Oracle 10g over RHEL4..
I have opened two sessions of sqlplus through different Terminal windows.. Now the issue that I am facing is listed below..
I made one sql file which contains some select query under one Terminal prompt.. Now i tried executing the same file from Other terminal prompt in sqlplus hr/hr,, it doesn't reflects the data instead when i did sqlplus hr/hr again(after exiting, then logging),, then it retrieved the actual data that i saved in the sql file under first Terminal prompt..
This happens everytime, i.e. every time I made some changes in the file under first Terminal prompt, and tried executing the one in other Terminal Prompt, then it reflects the previous data onlyy.. After i exit the session, and logged in again as hr/hr, then it reflects the actual data..
Please share the logic behind this..
Thanks in advance..
Rahul

The logic is one of the most basic of concepts in the Oracle database and one you must learn before you can have any hope of being successful. Oracle does not allow dirty reads.
Go to the docs at http://tahiti.oracle.com and read the Concept docs paying special attention to the following keywords:
SCN (system change number)
COMMIT
ROLLBACK
TRANSACTION
Multiversion Read Consistency
From the standpoint of the database in any other than the current session: Nothing is changed until you commit the transaction.

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"Fehmi" <[email protected]> wrote in message
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