Is the inline view functions causes more ?

Hi,
I am getting ORA-07445 CORE DUMP ERROR...
IT IS COMING ONLY SOMETIMES WHEN EXECUTING A STRORED PROCEDURE
WITH 10 STATEMENTS.
OUT OF THEM ONE REFERES TO REFCURSOR FOR OUT PARAMETER,
THAT QUERY IS LIKE
SELECT * FROM(SELECT * FROM (SELECT * FROM(.....))));
So is this inline view statement causes for such errors?
Please help me.
thanks in advance,
khaleel

The link for the Resource mentioned in Reply 2 is
http://digital.ni.com/public.nsf/allkb/F70DB3441DC5AB9986256E97005BA825
Probably regular FFT functions from Labview Signal Analysis and Processing Pallete can be used as well. In this case the following articles are worth reading:
http://zone.ni.com/devzone/conceptd.nsf/webmain/C045A890751303A6862568650061EA98
http://zone.ni.com/devzone/conceptd.nsf/webmain/66A9E8BFA65260F886256C5A00792BC6
http://zone.ni.com/devzone/conceptd.nsf/webmain/E0F0B1FFE86A14A986256F2E0005AF4D
Regards

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I am using Oracle 9i ,
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Please suggest.
Raj

WITH plus /*+ MATERIALIZE */ hint can do good to you.
see below the test case.
SQL> create table hx_my_tbl as select level id, 'karthick' name from dual connect by level <= 5
2 /
Table created.
SQL> insert into hx_my_tbl select level id, 'vimal' name from dual connect by level <= 5
2 /
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2 /
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1 0 HASH JOIN (Cost=7 Card=2 Bytes=48)
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5 4 INDEX (RANGE SCAN) OF 'HX_MY_TBL_IDX' (INDEX) (Cost=1 Card=2)
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2 select a.id, b.id, a.name, b.name
3 from my_view a,
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7 /
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3                  (select * from scott.dept d where d.deptno = 10) dd
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      7839 KING       PRESIDENT            17-NOV-1981       5000                    10         10 ACCOUNTING     NEW YORK
      7934 MILLER     CLERK           7782 23-JAN-1982       1300                    10         10 ACCOUNTING     NEW YORK
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|   0 | SELECT STATEMENT             |                |     3 |   171 |     2   (0)| 00:00:01 |
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|* 5 |    INDEX RANGE SCAN          | IDX_EMP_DEPTNO |     3 |       |     0   (0)| 00:00:01 |
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2          from scott.emp e,
3                  (select * from scott.dept d where d.deptno = 10 and rownum > 0) dd
4 where
5          e.deptno = dd.deptno
6 /
     EMPNO ENAME      JOB              MGR HIREDATE           SAL       COMM     DEPTNO     DEPTNO DNAME          LOC
      7782 CLARK      MANAGER         7839 09-JUN-1981       2450                    10         10 ACCOUNTING     NEW YORK
      7839 KING       PRESIDENT            17-NOV-1981       5000                    10         10 ACCOUNTING     NEW YORK
      7934 MILLER     CLERK           7782 23-JAN-1982       1300                    10         10 ACCOUNTING     NEW YORK
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| Id | Operation                       | Name           | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT                |                |     5 |   280 |     2   (0)| 00:00:01 |
|   1 | NESTED LOOPS                   |                |     5 |   280 |     2   (0)| 00:00:01 |
|   2 |   VIEW                          |                |     1 |    19 |     1   (0)| 00:00:01 |
|   3 |    COUNT                        |                |       |       |            |          |
|* 4 |     FILTER                      |                |       |       |            |          |
|   5 |      TABLE ACCESS BY INDEX ROWID| DEPT           |     1 |    20 |     1   (0)| 00:00:01 |
|* 6 |       INDEX UNIQUE SCAN         | PK_DEPT        |     1 |       |     0   (0)| 00:00:01 |
|   7 |   TABLE ACCESS BY INDEX ROWID   | EMP            |     5 |   185 |     1   (0)| 00:00:01 |
|* 8 |    INDEX RANGE SCAN             | IDX_EMP_DEPTNO |     5 |       |     0   (0)| 00:00:01 |
SQL> disconnect
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL>
can it, in it's WHERE clause, reference other tables in the FROM clause?No. it cannot. but as said above, tha may not stop Oracle from merging the queries.
SQL> select *
2          from scott.emp e,
3                  (select * from scott.dept d where d.deptno = 10 and e.sal > 1000) dd
4 where
5          e.deptno = dd.deptno
6 /
                (select * from scott.dept d where d.deptno = 10 and e.sal > 1000) dd
ERROR at line 3:
ORA-00904: "E"."SAL": invalid identifier
SQL>

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974632 wrote:
So what are the advantages of using inline views?
I would assume they would use more PGA and/or temp tablespace, but that doesn't seem to be the case in our database (or at least it is not causing any impact that I can tell).A critical point is whether the inline view can be merged into the calling query. As a general rule, if the view can be merged then the query will be more efficient than if it cannot be. A non-mergeable view has to be instantiated as a memory structure before the calling query can run against it. consider these examples:orcl>
orcl> set autot on exp
orcl> select count(ename) from (select ename from emp);
COUNT(ENAME)
          14
Execution Plan
Plan hash value: 2083865914
| Id | Operation                  | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT           |      |     1 |     6 |     4   (0)| 00:00:01 |
|   1 | SORT AGGREGATE            |      |     1 |     6 |            |          |
|   2 |   TABLE ACCESS STORAGE FULL| EMP |    14 |    84 |     4   (0)| 00:00:01 |
orcl> select count(ename) from (select distinct ename from emp);
COUNT(ENAME)
          14
Execution Plan
Plan hash value: 1851925981
| Id | Operation                    | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT             |      |     1 |     7 |     5 (20)| 00:00:01 |
|   1 | SORT AGGREGATE              |      |     1 |     7 |            |          |
|   2 |   VIEW                       |      |    14 |    98 |     5 (20)| 00:00:01 |
|   3 |    HASH UNIQUE               |      |    14 |    84 |     5 (20)| 00:00:01 |
|   4 |     TABLE ACCESS STORAGE FULL| EMP |    14 |    84 |     4   (0)| 00:00:01 |
orcl>The first query was merged, the second was not: the DISTINCT makes merging impossible, because Oracle cannot be certain that there are no duplicate names. But if I add a unique and not null constraints:orcl> alter table emp add constraint ename_uk unique(ename);
Table altered.
orcl> alter table emp modify ename not null;
Table altered.
orcl> select count(ename) from (select distinct ename from emp);
COUNT(ENAME)
          14
Execution Plan
Plan hash value: 1457629042
| Id | Operation        | Name     | Rows | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT |          |     1 |     1   (0)| 00:00:01 |
|   1 | SORT AGGREGATE |          |     1 |            |          |
|   2 |   INDEX FULL SCAN| ENAME_UK |    14 |     1   (0)| 00:00:01 |
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John Watson
Oracle Certified Master DBA
http://skillbuilders.com

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Message was edited by: markus hoerr
Message was edited by: markus hoerr

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//copied the code from Java
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Gives an error Missing IN or OUT parameter at index:: 1
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Please get back to me .
Regards
Mohan
[email protected]

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user11164565 wrote:
The query is taken from "Oracle Database 10g: SQL Fundamentals II" page 3-7 (chapter 3)
I do not fully understand the following query:
SELECT a.last_name, a.salary, a.department_id, b.salavg
FROM   employees a, (SELECT   department_id,
AVG(salary) salavg
FROM     employees
GROUP BY department_id) b
WHERE a.department_id = b.department_id
AND    a.salary > b.salavg;
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The query is returning the last name, salary , department and average salary of all the departments where salary is greater than the average salary.
HTH
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Improve performance of an inline view query

All,
I have a unique situation where I have to limit the number of rows based on group. so I created an Inline view and applied a limit on it.
ex:
SELECT col_A, col_B FROM ( SELECT col_a, count(*) FROM tab_a WHERE col_a = 'XXX' GROUP BY col_a) ROWNUM <-10.
but this design was rejected, because it seems to have a great impact on performance due to inline view.
Also I cant set a rowlimit directly on the query because GROUP BY clause is used in the select.
When the rownum is directly applied in the WHERE, first it limits the rows and then it makes a GROUP, so when user asks to retrieve 10 records, it may show less than 10 rows because of the grouping.
please help to find a alternative solution which helps to get the expected result set and same time without loosing performance.

Hi,
The sql you gave us is not valid. There is no "col_b" in your inline view, there is no "where" before "rownum<10", and the inline view returns only one row.
Try to produce a reproducible scenario with scott.emp and scott.dept generated by $ORACLE_HOME/rdbms/admin/utlsampl.sql
Regards
Laurent

Is the inline view functions causes more ?

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