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At last we have the final part of the Enigma class, and once again the unchanged parts have been snipped. Check out listing 9.7 if you want to refresh your memory. Only one change to mention, but it s an important one: the handleKeyPress() now has some plumbing to feed its key into the new paper node. This is what makes the encoded letter appear on the printout when a key is clicked.

If there appears to be a parse problem, but not a hard-parse problem, excessive soft parses might be a problem. Soft-parse problems potentially indicate application design problems in which cursors for the same set of SQL statements are repeatedly opened and closed, possibly due to application coding standards that stress modularization of application logic into black-box style function calls that are repeatedly called in an application loop. If the initialization parameter SESSION_CACHED_CURSORS is adjusted so that it is set appropriately, the performance issues related to excessive soft parsing of the same SQL statements by the same session may be significantly reduced (see Metalink Doc ID 32895.1, SQL Parsing Flow Diagram to better understand the steps involved in parsing SQL statements). Compare the value of this parameter to the number of cursors reported as actually cached for the session by examining the statistic session cursor cache count and the number of accesses of those cached cursors in the statistic session cursor cache hits from the view V$SESSTAT for each session. A SQL statement must be executed at least three times by the session before it becomes eligible for inclusion in the session s cached cursors. If a session is found that is spending an excessive number of seconds parsing based on the delta value of the statistic V$SESSTAT.NAME("parse time cpu")/100, enable a 10046 trace at level 12 for the session for a couple of minutes and process the resulting trace file (located in the udump directory on the server) by using tkprof with the parameter sort=prsela,fchela,exeela, or manually review the raw trace file by using a text editor to locate large values for the c= or e= entry on the lines beginning with PARSE #.

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This chapter covered a lot of material that, at times, may have made you scratch your head. While locking is rather straightforward, some of its side effects are not. However, it is vital that you understand these issues. For example, if you were not aware of the table lock Oracle uses to enforce a foreign key relationship when the foreign key is not indexed, then your application would suffer from poor performance. If you did not understand how to review the data dictionary to see who was locking whom, you might never figure that one out. You would just assume that the database hangs sometimes. I sometimes wish I had a dollar for every time I was able to solve the insolvable hanging issue by simply running the query to detect unindexed foreign keys and suggesting that we index the one causing the problem. I would be very rich.

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int Age { _age;

builder1.Append('C', 30); Console.WriteLine(builder1.Capacity); Console.WriteLine(builder1.Length);

If reflection-based rules are problematic for your application, you can implement hard-coded rule methods on a per-type basis.

So far, you have learned about RESTful web services, URL loading, and XML parsing. You have a web app where you can enter some high-score records by hand, and you can display those high scores on your iPhone.

< xml version="1.0" > <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping> <class name="hello.Message" table="MESSAGES"> <id name="id" column="MESSAGE_ID"> <generator class="increment"/> </id> <property name="text" column="MESSAGE_TEXT"/> <many-to-one name="nextMessage" cascade="all" column="NEXT_MESSAGE_ID" foreign-key="FK_NEXT_MESSAGE"/> </class> </hibernate-mapping>

Figure 13-19. Your application should now look like this. Now you are ready to build (press Ctrl+Shift+B) and switch back over to Visual Studio 2010 to code up the functionality that occurs when you click the Launch Word Button.

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