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In the previous example, Blake has already locked the record, and it is Adam who gets an exception when he tries to lock the same row: adam@ORA10G> select empno, ename, sal from emp where empno=7654 and ename='MARTIN' and sal=1350 for update nowait; select empno, ename, sal from emp where empno=7654 and ename='MARTIN' and sal=1350 for update nowait * ERROR at line 1: ORA-00054: resource busy and acquire with NOWAIT specified If between the time Blake looked at the record and signaled his intention to update a record, someone else already changed the underlying data on the screen and committed the changes (thus releasing the lock), then Blake would get zero rows returned by the previous select This is because Blake included all the columns that could be changed in the where clause of the select that locks the row.

At least one of these criteria would not be met due to the changes in the column values performed by the other transaction Thus, locking the record before updating it serializes the update and prevents the transactions from stepping over each other In the previous example, Blake can safely update the salary of Martin: blake@ORA10G> update emp set sal=sal*110 where empno=7654; 1 row updated blake@ORA10G> commit; Adam, unfortunately, will have to try again..

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Probably the simplest of the ASP .NET AJAX server controls is the Timer control. Similar in many ways to the Timer control that has existed for some time for Winforms, the Timer control provides a simple-to-use timer functionality that can be configured to perform operations repeatedly based on the time elapsed. Therefore, you can run certain operations at a regular interval in a synchronous or asynchronous manner without having to do a manual page refresh. This can come in handy in many scenarios for web applications.

An advantage of pessimistic locking is that it prevents the situation in which the user has typed in lots of changes on a screen, but when he submits the changes, he is told, Sorry, someone else has changed the record you have been modifying Please try again This can be very annoying Remember that if someone has locked a row, the user doesn t have to wait until the lock is released: Using the nowait option, we can immediately detect this situation and give control back to the user Unfortunately, pessimistic locking does have some significant disadvantages: Pessimistic locking can t be used in applications that use a stateless environment, such as a three-tier web application Again, this is because typically in such an environment, you don t maintain the same database session across multiple requests.

The session that the user used to lock the row while selecting it to display and the session that the user uses to submit the changes to update the row may well be different, in which case the lock held by the user is of no use This is one of the major disadvantages of pessimistic locking, since most applications today are web applications that use connection pooling and don t maintain session state across pages Thus, pessimistic locking is useful mainly in client/server applications that maintain the same connection across GUI pages In this respect, this solution is similar to the solution of setting the transaction isolation to SERIALIZABLE, as discussed in the previous section Pessimistic locking can result in a row being locked for relatively long periods of time.

Imagine, for instance, that your page contains critical and dynamic information such as stock quotes or flight arrival information that needs to be updated on a regular basis. You can use the Timer control on your page to trigger updates to an UpdatePanel control, all without having to do any full-page refreshes.

In an application where the chance of users updating the same row is great, the number of users that can get the Sorry, someone else is changing the record that you want to modify Please try again message can multiply rapidly Also consider what happens if someone locks a row and forgets about it or goes out for lunch Session timeouts can handle such situations, but this can still be a bottleneck The optimistic locking technique discussed next tries to address the problems just outlined..

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