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Now, to test the query, we ll just rerun the query: ops$tkyte%ORA11GR2> exec stats.cnt := 0 PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> exec :cpu := dbms_utility.get_cpu_time PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> set autotrace on explain ops$tkyte%ORA11GR2> select ename, hiredate 2 from emp 3 where substr(my_soundex(ename),1,6) = my_soundex('Kings') 4 / ENAME ---------Ku$_Chunk_ Ku$_Chunk_ Ku$_Chunk_ Ku$_Chunk_ HIREDATE --------13-AUG-09 13-AUG-09 13-AUG-09 13-AUG-09
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Execution Plan ---------------------------------------------------------Plan hash value: 2259214921 -----------------------------------------------------------------------------------| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| -----------------------------------------------------------------------------------| 0 | SELECT STATEMENT | | 100 | 2400 | 12 (0)| | 1 | TABLE ACCESS BY INDEX ROWID| EMP | 100 | 2400 | 12 (0)| |* 2 | INDEX RANGE SCAN | EMP_SOUNDEX_IDX | 40 | | 1 (0)| -----------------------------------------------------------------------------------Predicate Information (identified by operation id): --------------------------------------------------2 - access(SUBSTR("OPS$TKYTE"."MY_SOUNDEX"("ENAME"),1,6)="MY_SOUNDEX"('Kings')) ops$tkyte%ORA11GR2> set autotrace off ops$tkyte%ORA11GR2> begin 2 dbms_output.put_line 3 ( 'cpu time = ' || round((dbms_utility.get_cpu_time-:cpu)/100,2) ); 4 dbms_output.put_line( 'function was called: ' || stats.cnt ); 5 end; 6 / cpu time = .01 function was called: 1 PL/SQL procedure successfully completed. If we compare the two examples (unindexed versus indexed), we find that the insert into the indexed table was affected by a little more than 150 percent the runtime. However, the select went from a half second to effectively instantly. The important things to note here are the following:
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The insertion of 9,999 records took approximately 1.5 times longer. Indexing a user-written function will necessarily affect the performance of inserts and some updates. You should realize that any index will impact performance, of course. For example, I did a simple test without the MY_SOUNDEX function, just indexing the ENAME column itself. That caused the INSERT to take about one second to execute the PL/SQL function is not responsible for the entire overhead. Since most applications insert and update singleton entries, and each row took less than 1/10,000 of a second to insert, you probably won t even notice this in a typical application. Since we insert a row only once, we pay the price of executing the function on the column once, not the thousands of times we query the data. While the insert ran two times slower, the query ran many times faster. It evaluated the MY_SOUNDEX function a few times instead of almost 10,000 times. The difference in performance of our query here is measurable and quite large. Also, as the size of our table grows, the full scan query will take longer and longer to execute. The index-based query will always execute with nearly the same performance characteristics as the table gets larger. We had to use SUBSTR in our query. This is not as nice as just coding WHERE MY_SOUNDEX(ename)=MY_SOUNDEX( 'King' ), but we can easily get around that, as we will see shortly.
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So, the insert was affected, but the query ran incredibly fast. The payoff for a small reduction in insert/update performance is huge. Additionally, if you never update the columns involved in the MY_SOUNDEX function call, the updates are not penalized at all (MY_SOUNDEX is invoked only if the ENAME column is modified and its value changed). Let s see how to make it so the query does not have to use the SUBSTR function call. The use of the SUBSTR call could be error-prone our end users have to know to SUBSTR from 1 for six characters. If they use a different size, the index will not be used. Also, we want to control in the server the number of bytes to index. This will allow us to reimplement the MY_SOUNDEX function later with 7 bytes instead of 6 if we want to. We can hide the SUBSTR with a virtual column in Oracle Database 11g Release 1 and above or a view in any release quite easily as follows: ops$tkyte%ORA11GR2> create or replace view emp_v 2 as 3 select ename, substr(my_soundex(ename),1,6) ename_soundex, hiredate 4 from emp 5 / View created. ops$tkyte%ORA11GR2> exec stats.cnt := 0; PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> exec :cpu := dbms_utility.get_cpu_time PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> select ename, hiredate 2 from emp_v 3 where ename_soundex = my_soundex('Kings') 4 / ENAME HIREDATE ---------- --------Ku$_Chunk_ 13-AUG-09
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