counter incremented too many times
Hi I have a code where my cost is incremented too many times I try to know where, is there anyone can help
hear is a formatted code How to adjust and optimize the Code POI exports adf table except he's usingSXSSFWorkbook
Line 54 # in the referenced code list is redundant:
rowCounter ++;
In this way you are increment the line counter when looping through the columns, which does not. Just remove this line.
Dimitar
Tags: Java
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A reminder of the facts:
Above function / request is of course a simple example.
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SQL> select /*+ NO_MERGE(tmp) */ 2 tmp.*, 3 regexp_substr(f_all_emp,'[^;]*',1,1) emp1, 4 regexp_substr(f_all_emp,'[^;]*',1,3) emp2, 5 regexp_substr(f_all_emp,'[^;]*',1,5) emp3, 6 regexp_substr(f_all_emp,'[^;]*',1,7) emp4, 7 regexp_substr(f_all_emp,'[^;]*',1,9) emp5, 8 regexp_substr(f_all_emp,'[^;]*',1,11) emp6 9 from ( 10 select d.deptno, 11 d.dname, 12 all_emp(d.deptno) f_all_emp 13 from dept d 14 ) tmp 15 / DEPTNO DNAME F_ALL_EMP EMP1 EMP2 EMP3 EMP4 EMP5 EMP6 ---------- -------------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- 10 ACCOUNTING CLARK; KIN CLARK KING MILLER G; MILLER; 20 RESEARCH SMITH; JON SMITH JONES SCOTT ADAMS FORD ES; SCOTT; ADAMS; FO RD; 30 SALES ALLEN; WAR ALLEN WARD MARTIN BLAKE TURNER JAMES D; MARTIN; DEPTNO DNAME F_ALL_EMP EMP1 EMP2 EMP3 EMP4 EMP5 EMP6 ---------- -------------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- BLAKE; TU RNER; JAME S; 40 OPERATIONS function called function called function called function called function called function called SQL> explain plan for 2 select /*+ NO_MERGE(tmp) */ 3 tmp.*, 4 regexp_substr(f_all_emp,'[^;]*',1,1) emp1, 5 regexp_substr(f_all_emp,'[^;]*',1,3) emp2, 6 regexp_substr(f_all_emp,'[^;]*',1,5) emp3, 7 regexp_substr(f_all_emp,'[^;]*',1,7) emp4, 8 regexp_substr(f_all_emp,'[^;]*',1,9) emp5, 9 regexp_substr(f_all_emp,'[^;]*',1,11) emp6 10 from ( 11 select d.deptno, 12 d.dname, 13 all_emp(d.deptno) f_all_emp 14 from dept d 15 ) tmp 16 / Explained. SQL> @?\rdbms\admin\utlxpls PLAN_TABLE_OUTPUT ------------------------------------------------------------------------------------------------------ Plan hash value: 2317111044 --------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | --------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 4 | 8096 | 3 (0)| 00:00:01 | | 1 | VIEW | | 4 | 8096 | 3 (0)| 00:00:01 | | 2 | TABLE ACCESS FULL| DEPT | 4 | 52 | 3 (0)| 00:00:01 | --------------------------------------------------------------------------- 9 rows selected. SQL>Not sure why the function is executed once 6 and not 4. What we really want, is to materialize reviews online:
SQL> with tmp as ( 2 select /*+ materialize */ 3 d.deptno, 4 d.dname, 5 all_emp(d.deptno) f_all_emp 6 from dept d 7 ) 8 select tmp.*, 9 regexp_substr(f_all_emp,'[^;]*',1,1) emp1, 10 regexp_substr(f_all_emp,'[^;]*',1,3) emp2, 11 regexp_substr(f_all_emp,'[^;]*',1,5) emp3, 12 regexp_substr(f_all_emp,'[^;]*',1,7) emp4, 13 regexp_substr(f_all_emp,'[^;]*',1,9) emp5, 14 regexp_substr(f_all_emp,'[^;]*',1,11) emp6 15 from tmp 16 / DEPTNO DNAME F_ALL_EMP EMP1 EMP2 EMP3 EMP4 EMP5 EMP6 ---------- -------------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- 10 ACCOUNTING CLARK; KIN CLARK KING MILLER G; MILLER; 20 RESEARCH SMITH; JON SMITH JONES SCOTT ADAMS FORD ES; SCOTT; ADAMS; FO RD; 30 SALES ALLEN; WAR ALLEN WARD MARTIN BLAKE TURNER JAMES D; MARTIN; DEPTNO DNAME F_ALL_EMP EMP1 EMP2 EMP3 EMP4 EMP5 EMP6 ---------- -------------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- BLAKE; TU RNER; JAME S; 40 OPERATIONS function called function called function called function called SQL> explain plan for 2 with tmp as ( 3 select /*+ materialize */ 4 d.deptno, 5 d.dname, 6 all_emp(d.deptno) f_all_emp 7 from dept d 8 ) 9 select tmp.*, 10 regexp_substr(f_all_emp,'[^;]*',1,1) emp1, 11 regexp_substr(f_all_emp,'[^;]*',1,3) emp2, 12 regexp_substr(f_all_emp,'[^;]*',1,5) emp3, 13 regexp_substr(f_all_emp,'[^;]*',1,7) emp4, 14 regexp_substr(f_all_emp,'[^;]*',1,9) emp5, 15 regexp_substr(f_all_emp,'[^;]*',1,11) emp6 16 from tmp 17 / Explained. SQL> @?\rdbms\admin\utlxpls PLAN_TABLE_OUTPUT ----------------------------------------------------------------------------------------------------------------------- Plan hash value: 634594723 --------------------------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | --------------------------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 4 | 8096 | 5 (0)| 00:00:01 | | 1 | TEMP TABLE TRANSFORMATION | | | | | | | 2 | LOAD AS SELECT | | | | | | | 3 | TABLE ACCESS FULL | DEPT | 4 | 52 | 3 (0)| 00:00:01 | | 4 | VIEW | | 4 | 8096 | 2 (0)| 00:00:01 | | 5 | TABLE ACCESS FULL | SYS_TEMP_0FD9D6603_20255AE | 4 | 52 | 2 (0)| 00:00:01 | PLAN_TABLE_OUTPUT ----------------------------------------------------------------------------------------------------------------------- --------------------------------------------------------------------------------------------------------- 12 rows selected. SQL>However, suspicion of MATERIALIZATION is a hint of undocumented.
SY.
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