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It is possible to encounter a situation where two sessions block each other in such a fashion that both will hang, each waiting for the other to release its lock This is a deadlock Deadlocks are not the DBA s problem; they are caused by bad program design and resolved automatically by the database itself Information regarding deadlocks is written out to the alert log, with full details in a trace file part of your daily monitoring will pick up the occurrence of deadlocks and inform your developers that they are happening If a deadlock occurs, both sessions will hang but only for a brief moment One of the sessions will detect the deadlock within seconds, and it will roll back the statement that caused the problem This will free up the other session, returning the message ORA-00060 Deadlock detected This message must be trapped by your programmers in their exceptions clauses, which should take appropriate action It must be emphasized that deadlocks are a program design fault They occur because the code attempts to do something that is logically impossible Well-written code will always request locks in a sequence that cannot cause deadlocks to occur, or will test whether incompatible locks already exist before requesting them Exercise 8-6: Detect and Resolve Lock Contention In this exercise, you will first use SQL*Plus to cause a problem, and detect and solve it with Database Control 1 Using SQL*Plus, connect to your database in two sessions as user WEBSTORE 2 In your first session, lock all the rows in the PRODUCTS table:

select * from products for update;

3 In your second session, attempt to update a row The session will hang:

A common task for designers working in Photoshop is to remove blemishes or other unneeded items from images In the past, the Clone tool was the best tool for the job, and although that tool is still a good candidate in many cases, the Healing Brush and Patch tools are coming on strong Both tools not only copy and paste between areas of an image, but also add color and tonal correction to cause the pasted area to more closely fit with the pixels around it

update products set stock_count=stock_count-1;

4 Connect to your database as user SYSTEM with Database Control 5 Navigate to the Instance Locks window, by taking the Performance tab from the database home page, and then the Database Locks link in the Additional Monitoring Links section 6 Observe that the second SYSTEM session is shown as waiting for an EXCLUSIVE lock Select the radio button for the first, blocking, session and click KILL SESSION 7 In the confirmation window, click SHOW SQL This will show a command something like

Suppose, for example, I wanted to remove the top leaf from the clover shown in Figure 8-23 Using the Clone tool, I could tediously try to paint out the clover and replace it with a sample from the adjacent background gradient However, matching the gradient would not be easy Believe it or not, I can remove the top leaf with the Patch tool in a matter of ten seconds and then touch up with the Healing Brush tool, and you d never know it was there Compare Figures 8-23, 8-24, and 8-25 to see what I mean

8 Click RETURN and YES to execute the KILL SESSION command 9 Returning to your SQL*Plus sessions, you will find that the second session is now working, but that the first session can no longer run any commands

.