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This was great because we could now effectively extend the SQL language to include application-specific functions. Unfortunately, however, the performance of the preceding query was a bit disappointing at times. Say the EMP table had 1,000 rows in it. The function SOME_OTHER_FUNCTION would be executed 1,000 times during the query, once per row. In addition, assuming the function took one-hundredth of a second to execute, this relatively simple query now takes at least ten seconds. Let s look at a real example, where we ll implement a modified SOUNDEX routine in PL/SQL. Additionally, we ll use a package global variable as a counter in our procedure, which will allow us to execute queries that make use of the MY_SOUNDEX function and see exactly how many times it was called: ops$tkyte@ORA10G> create or replace package stats 2 as 3 cnt number default 0; 4 end; 5 / Package created. ops$tkyte@ORA10G> create or replace 2 function my_soundex( p_string in varchar2 ) return varchar2 3 deterministic 4 as 5 l_return_string varchar2(6) default substr( p_string, 1, 1 ); 6 l_char varchar2(1);

> ajc *.java > java Test Entering [Test.main] Entering [Inventory.<init>] Entering [Item.<init>] Entering [Item.<init>] Entering [Item.<init>] Entering [Inventory.addItem] Entering [Inventory.addItem] Entering [Inventory.addItem] Entering [ShoppingCart.<init>] Entering [ShoppingCartOperator.addShoppingCartItem] Entering [Inventory.removeItem] Entering [ShoppingCart.addItem] Entering [ShoppingCartOperator.addShoppingCartItem] Entering [Inventory.removeItem] Entering [ShoppingCart.addItem]

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7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

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The output is similar to that using the standard Java logging toolkit. You can control the information being logged, such as the addition of a timestamp or the format of the log messages, by modifying the properties file. Please refer to the log4j documentation for more details. 5.4.2 Exceptions logging Because exception throwing is usually considered an important event in the system, logging such occurrences is typically desirable. Exception logging is an extension of the tracing concept, except the focus is on exceptional conditions in a program rather than execution of methods. The conventional way to log exceptions is to surround the interesting parts of code with a try/catch block and instrument each catch block with a log statement. With AspectJ, it is possible to log exceptions thrown by a method without any modification to the original code. In this section, we develop an aspect that enables the logging of thrown exceptions in the system. As in the earlier section, we later modify the aspect to use standard Java logging and log4j toolkit. Let s begin with listing 5.13. This aspect can log any method in the system that is returned by throwing an exception. The version in listing 5.13 uses the good old System.err as the logging stream.

number default 0;

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import org.aspectj.lang.*; public aspect ExceptionLoggerAspectV1 { pointcut exceptionLogMethods() : call(* *.*(..)) && !within(ExceptionLoggerAspectV1);

type vcArray is table of varchar2(10) index by binary_integer; l_code_table vcArray; begin stats.cnt := stats.cnt+1; l_code_table(1) l_code_table(2) l_code_table(3) l_code_table(4) l_code_table(5) l_code_table(6) := := := := := := 'BPFV'; 'CSKGJQXZ'; 'DT'; 'L'; 'MN'; 'R';

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Table 11-6 shows that rows 8, 10, and 13 have the value ANALYST, whereas rows 4, 6, and 7 have the value MANAGER. It also shows us that no rows are null (bitmap indexes store null entries; the lack of a null entry in the index implies there are no null rows). If we wanted to count the rows that have the value MANAGER, the bitmap index would do this very rapidly. If we wanted to find all the rows such that the JOB was CLERK or MANAGER, we could simply combine their bitmaps from the index as, shown in Table 11-7. Table 11-7. Representation of a Bitwise OR

for i in 1 .. length(p_string) loop exit when (length(l_return_string) = 6); l_char := upper(substr( p_string, i, 1 ) ); for j in 1 .. l_code_table.count loop if (instr(l_code_table(j), l_char ) > 0 AND j <> l_last_digit) then l_return_string := l_return_string || to_char(j,'fm9'); l_last_digit := j; end if; end loop; end loop; return rpad( l_return_string, 6, '0' ); end; /

after() throwing(Throwable ex) : exceptionLogMethods() { Signature sig = thisJoinPointStaticPart.getSignature(); System.err.println("Exception logger aspect [" + sig.getDeclaringType().getName() + "." + sig.getName() + "]"); ex.printStackTrace(System.err); Advice that logs any } exception thrown }

This is a topic very closely related to concurrency control as it forms the foundation for Oracle s concurrency control mechanism. Oracle operates a multi-version, read-consistent concurrency model. In 7 Concurrency and Multi-versioning, we ll cover the technical aspects in more detail but, essentially, it is the mechanism by which Oracle provides for: Read-consistent queries: Queries that produce consistent results with respect to a point in time. Non-blocking queries: Queries are never blocked by writers of data, as they are in other databases.

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