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CHAPTER 11 INDEXES
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This was great because we could now effectively extend the SQL language to include applicationspecific 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 onehundredth 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$tkyte@ORA11GR2> create or replace package stats 2 as 3 cnt number default 0; 4 end; 5 / Package created. ops$tkyte@ORA11GR2> 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); 7 l_last_digit number default 0; 8 9 type vcArray is table of varchar2(10) index by binary_integer; 10 l_code_table vcArray; 11 12 begin 13 stats.cnt := stats.cnt+1; 14 15 l_code_table(1) := 'BPFV'; 16 l_code_table(2) := 'CSKGJQXZ'; 17 l_code_table(3) := 'DT'; 18 l_code_table(4) := 'L'; 19 l_code_table(5) := 'MN'; 20 l_code_table(6) := 'R'; 21 22 23 for i in 1 .. length(p_string) 24 loop 25 exit when (length(l_return_string) = 6); 26 l_char := upper(substr( p_string, i, 1 ) ); 27 28 for j in 1 .. l_code_table.count 29 loop 30 if (instr(l_code_table(j), l_char ) > 0 AND j <> l_last_digit) 31 then 32 l_return_string := l_return_string || to_char(j,'fm9'); 33 l_last_digit := j; 34 end if; 35 end loop; 36 end loop; 37
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CHAPTER 11 INDEXES
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return rpad( l_return_string, 6, '0' ); end; /
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Function created. Notice in this function, we are using a 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. 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$tkyte%ORA11GR2> set autotrace on explain ops$tkyte%ORA11GR2> variable cpu number ops$tkyte%ORA11GR2> exec :cpu := dbms_utility.get_cpu_time PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> select ename, hiredate 2 from emp 3 where my_soundex(ename) = 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: 3956160932 -------------------------------------------------------------------------| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | -------------------------------------------------------------------------| 0 | SELECT STATEMENT | | 100 | 1900 | 24 (9)| 00:00:01 | |* 1 | TABLE ACCESS FULL| EMP | 100 | 1900 | 24 (9)| 00:00:01 | -------------------------------------------------------------------------Predicate Information (identified by operation id): --------------------------------------------------1 - filter("MY_SOUNDEX"("ENAME")="MY_SOUNDEX"('Kings')) ops$tkyte%ORA11GR2> set autotrace off
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