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Function created. Notice in this function, we are using a new keyword, DETERMINISTIC. This declares that the preceding function, when given the same inputs, will always return the exact same output. This is needed to create an index on a user-written function. We must tell Oracle that the function is DETERMINISTIC and will return a consistent result given the same inputs. We are telling Oracle that this function should be trusted to return the same value, call after call, given the same inputs. If this were not the case, we would receive different answers when accessing the data via the index versus a full table scan. This deterministic setting implies, for example, that we cannot create an index on the function DBMS_RANDOM.RANDOM, the random number generator. Its results are not deterministic; given the same inputs, we ll get random output. The built-in SQL function UPPER used in the first example, on the other hand, is deterministic, so we can create an index on the UPPER value of a column.

These are two very important concepts in the Oracle database. The term multi-versioning basically describes Oracle s ability to simultaneously maintain multiple versions of the data in the database (since version 3.0 in 1983!). The term read-consistency reflects the fact that a query in Oracle will return results as of a consistent point in time: Every block used by a query will be as of the same exact point in time even if it was modified or locked while you performed your query. If you understand how multiversioning and read consistency work together, you will always understand the answers you get from the database. Before we explore in a little more detail how Oracle does this, here is the simplest way I know to demonstrate multi-versioning in Oracle: ops$tkyte%ORA11GR2> create table t 2 as 3 select * 4 from all_users 5 / Table created. ops$tkyte%ORA11GR2> set autoprint off ops$tkyte%ORA11GR2> variable x refcursor; ops$tkyte%ORA11GR2> begin 2 open :x for select * from t; 3 end; 4 / PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> declare 2 pragma autonomous_transaction; 3 -- you could do this in another 4 -- sqlplus session as well, the 5 -- effect would be identical 6 begin 7 delete from t; 8 commit; 9 end; 10 / PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> print x

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The exceptionLogMethods() pointcut captures all the methods that need exception logging. Here, we are defining this as a call to any method in the system. You can modify this pointcut to include a subset of methods, as described in section 5.4.1. The after throwing advice collects the thrown object as context. The advice uses thisJoinPointStaticPart to log the information about captured join points. Finally, it prints the stack trace of the thrown exception. Let s write a simple program (listing 5.14) to test our aspect.

Now that we have the function MY_SOUNDEX, let s see how it performs without an index. This uses the EMP table we created earlier with about 10,000 rows in it: ops$tkyte@ORA10G> set timing on ops$tkyte@ORA10G> set autotrace on explain ops$tkyte@ORA10G> select ename, hiredate 2 from emp 3 where my_soundex(ename) = my_soundex('Kings') 4 / ENAME HIREDATE ---------- --------Ku$_Chunk_ 10-AUG-04 Ku$_Chunk_ 10-AUG-04 Elapsed: 00:00:01.07 Execution Plan ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=32 Card=100 Bytes=1900) 1 0 TABLE ACCESS (FULL) OF 'EMP' (TABLE) (Cost=32 Card=100 Bytes=1900) ops$tkyte@ORA10G> set autotrace off ops$tkyte@ORA10G> set timing off ops$tkyte@ORA10G> set serveroutput on ops$tkyte@ORA10G> exec dbms_output.put_line( stats.cnt ); 19998 PL/SQL procedure successfully completed. We can see this query took over one second to execute and had to do a full scan on the table. The function MY_SOUNDEX was invoked almost 20,000 times (according to our counter), twice for each row. Let s see how indexing the function can speed up things. The first thing we ll do is create the index as follows: ops$tkyte@ORA10G> create index emp_soundex_idx on 2 emp( substr(my_soundex(ename),1,6) ) 3 / Index created. The interesting thing to note in this CREATE INDEX command is the use of the SUBSTR function. This is because we are indexing a function that returns a string. If we were indexing a function that returned a number or date, this SUBSTR would not be necessary. The reason we must SUBSTR the user-written function that returns a string is that such functions return VARCHAR2(4000) types. That may well be too big to be indexed index entries must fit within about three quarters the size of a block. If we tried, we would receive (in a tablespace with a 4KB blocksize) the following:

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