line blocking during the update statement


Hello

Using Oracle 11 g 2. If I call the following update statement of meeting A, meeting A locks the line until a statement commit / rollback is emanating from the session has. If the session B calls the same statement was updated and the same line, session B will have to wait until the lock is released in the session. However, application developers are expressed in terms of discussions. Would it be possible that the update statement is called in the same session by several requests? If so, the case statement can be evaluated without the line being locked which could lead to erroneous results? Trying to keep this short message.

tableA has column (number of key, primary) and columnB (number)

{

Update tableA

Define columnB = case when columnB = 3 then

4

When columnB = 4 then

5

on the other

columnB

end

When columnA = 6;

}

2 applications (almost at the same time) in the same session could assess columnB 3. The goal would be the first query sets in column 4 and the second request sets in column 5.

> However, application developers are expressed in terms of discussions.

Of course, they are...

But each application thread will have its own dedicated database session.

Tags: Database

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