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Whereas you might see an ORA-08177 error in a SERIALIZABLE transaction, you expect to see an ORA-1555: snapshot too old error with READ ONLY transactions This will happen on a system where other people are actively modifying the information you are reading The changes (undo) made to this information are recorded in the rollback segments But rollback segments are used in a circular fashion in much the same manner as redo logs The longer the report takes to run, the better the chance that some undo you need to reconstruct your data won t be there anymore The rollback segment will have wrapped around, and the portion of it you need we be reused by some other transaction At this point, you will receive the ORA-1555 error and have to start over again.

The most efficient way to see what locks currently exist within your instance is to use the OEM Database Control (or Grid Control) You can get to this page by going to Database Control Home Page Performance Additional Monitoring Links Instance Locks The Instance Locks page shows all locks, both blocking and non-blocking Most of the locks you ll see are harmless; they are routine non-blocking locks Oracle uses to maintain concurrency To see locks that are causing contention in your system, choose the Blocking Sessions option from the drop-down list in the Instance Locks page The Blocking Session page will show you all the sessions that are currently blocking other sessions You can also go directly to the Blocking Sessions page by going to Database Control Home Page Performance Additional Monitoring Links Blocking Sessions.

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Class A has a field called methodReference that is used to make indirect calls to a method. Although the class diagram doesn t show the signature used by A.methodReference, assume the signature is the same as that of B.Method1. The class diagram reveals no information about coupling or other relationships between A and B. Classes A and B are completely decoupled from each other. It is perfectly possible that different people implemented the classes, not predicting that the classes would ever be used together. Assume that at run time there are instances of A and B, called respectively object1 and object2, and that object1.methodReference is initialized to point to object2.Method1, as shown in Figure 1-19.

The Blocking Sessions page shows the session IDs of both the blocking and the blocked sessions (see Figure 6-1) You can terminate a blocking session by selecting the appropriate session and clicking the Kill Session button Figure 6-1 shows that the user nick_alapati is holding an exclusive lock (on a certain row in the test01 table, which you can t see in the figure), thereby blocking the user nina_alapati from getting an exclusive lock on the same row The blocking session is identified by a value of 1 or greater under the Sessions Blocked column on the Blocking Sessions page (see Figure 6-1) The session that s being blocked is indicated by a value of zero You can also use OEM s Hang Analysis page (go to Database Control Home Page Performance Additional Monitoring Links Hang Analysis) to find out the exact wait status of the blocking and waiting sessions.

The only solution to this sticky issue is to have rollback segments that are sized correctly for your system Time and time again, I see people trying to save a few megabytes of disk space by having the smallest possible rollback segments ( Why waste space on something I don t really need is the thought) The problem is that the rollback segments are a key component of the way the database works, and unless they are sized correctly, you will hit this error In 16 years of using Oracle 6, 7, and 8, I can say I have never hit an ORA-1555 error outside of a testing or development system In such a case, you know you have not sized the rollback segments correctly and you fix it We will revisit this issue in 9..

The Hang Analysis page will show you the following: Instantaneously blocked sessions Sessions in a prolonged wait state Sessions that are hung When there is a severe contention for locks in the instance, the Hang Analysis page will help you identify the problems much more quickly than running a SQL script, which might actually worsen the locking problems..

object2: B object1: A methodReference Method1()

So far, we ve seen how multi-versioning provides us with non-blocking reads, and I have stressed that this is a good thing: consistent (correct) answers with a high degree of concurrency. What could be wrong with that Well, unless you understand that it exists and what it implies, then you are probably doing some of your transactions incorrectly. Recall from 1 the scheduling resources example whereby we had to employ some manual locking techniques (via SELECT FOR UPDATE to serialize modifications to the SCHEDULES table by resource). But can it affect us in other ways The answer to that is definitely yes. We ll go into the specifics in the sections that follow.

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