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over time. The more people parsing, the more people waiting in line to latch the shared pool, the longer the queues, the longer the wait. Executing SQL statements without bind variables is very much like compiling a subroutine before each method call. Imagine shipping Java source code to your customers where, before calling a method in a class, they had to invoke the Java compiler, compile the class, run the method, and then throw away the byte code. Next time they wanted to execute the same method, they would do the same thing: compile it, run it, and throw it away. You would never consider doing this in your application; you should never consider doing this in your database either. Another impact of not using bind variables, for developers employing string concatenation, is security specifically something called SQL injection. If you are not familiar with this term, I encourage you to put aside this book for a moment and, using the search engine of your choice, look up SQL injection. There are almost one million hits returned for it as I write this edition. The problem of SQL injection is well-documented.

When marking a child class using the Indexable attribute, you can further specify the behavior of the index. In some cases, you might think it is desirable to force the creation of an index for a child class. For example, if you know for sure that you are going to use the index and you don t want to take the performance hit the first time you use it, you would use the IndexModeAlways option on the attribute. This way, when items are added, they re indexed immediately rather than the first time a query needs it. On the other hand, if it is important to optimize for load time on the collection and if it is

Note SQL injection is a security hole whereby the developer accepts input from an end user and concatenates that

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to party!), including the uninvited Goddess of Discord and Strife, Eris. Sam smiled with concern at the situation. He already knew that IT mergers are challenging to begin with, without an intentional distracter such as Eris spawning intrigue and trying to crash them! Eris might well qualify as a sponsor and a patroness of today s hackers, spammers, and inside IT saboteurs, he thought. Her beautiful Apple of Discord that she threw upon a table at the wedding banquet carried an inscription, To the Fairest (a goddess, that is!).

input into a query, then compiles and executes that query. In effect, the developer accepts snippets of SQL code from the end user, then compiles and executes those snippets. That approach allows the end user to potentially modify the SQL statement so that it does something the application developer never intended. It s almost like leaving a terminal open with a SQL Plus session logged in and connected as SYSDBA. You are just begging someone to come by and type in some command, compile it, and then execute it. The results can be disastrous.

acceptable to take the hit on index creation the first time you do a query that may take advantage of the index, you would use IndexModeOnDemand. The IndexModeNever option is provided to mark cases in which you want to ensure that indexes are never created on a field. Table 14-1 summarizes the parameters of the Indexable attribute.

It is a fact that if you do not use bind variables, that if you use the string concatenation technique in PROC2 shown earlier, your code is subject to SQL injection attacks and must be carefully reviewed. And it should be reviewed by people who don t actually like the developer who wrote the code because the code must be reviewed critically and objectively. If the reviewers are peers of the code author, or worse, friends or subordinates, the review will not be as critical as it should be. Developed code that does not use bind variables must be viewed with suspicion it should be the exceptional case where bind variables are not used, not the norm. To demonstrate how insidious SQL injection can be, I present this small routine: ops$tkyte%ORA11GR2> create or replace procedure inj( p_date in date ) 2 as 3 l_rec all_users%rowtype; 4 c sys_refcursor; 5 l_query long; 6 begin 7 l_query := ' 8 select * 9 from all_users 10 where created = ''' ||p_date ||''''; 11 12 dbms_output.put_line( l_query ); 13 open c for l_query; 14 15 for i in 1 .. 5 16 loop 17 fetch c into l_rec;

18 exit when c%notfound; 19 dbms_output.put_line( l_rec.username || '.....' ); 20 end loop; 21 close c; 22 end; 23 / Procedure created.

Load an index only when needed. Always load and maintain an index for this property. Never create an index for this property.

Note This code prints out only five records at most. It was developed to be executed in an empty schema. A

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