Sql for top sql

Dear DBAs
Application team has asked me to provide TOP Sql statements in testing database which can help them to improve code. Developer gave OEM top sql example from his last job.
Currently I do not have OEM installed. I am on 10.2.0.1.0 . I was thinking
to create a job to run sql and email everyday.
What sql can I use to generate that report ? What does OEM reports on when it show TOP Sql ?
Thanks

OEM will show you TOP sql by different catogories (each of which can be sorted) such as:
Disk Reads Per Execution
Buffer Gets Per Execution
Executions
Disk Reads
Buffer Gets
Buffer Gets Per Row
Buffer Cache Hit Ration
Sorts
Shareable memory
Rows Processed
CPU Time
Elapsed Time
Now having said that....just because the TOP sql statement is the TOP sql statement does not mean that anything needs tuned. Your developers should be examining their SQL using insite gained from reading articles and documentation.
Tuning use explain plan:
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:231814117467
SQL Tuning
http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/sql_1016.htm#sthref1061
Automatic SQL Tuning
http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/sql_tune.htm#g42443
In particular:
12.2.4 Using SQL Tuning Advisor with Oracle Enterprise Manager
These links should point you in the right direction:
Of course there are books and Oracle classes that concentrate on these issues as well.
Regards
Tim Boles

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Is rank() really better than rownum for top-n-queries?

Several sources say that for Oracle databases rank() should be used instead of 'rownum <= n' for top-n-queries. But here we have an application, where we a lot of top-n queries are executed on a big table with several million rows and rank() has a quite bad performance. I get much better results when I use a query with rownum <= n but the programmer of the application doesn't want to change it in the software because of those articles about rank() and rownum. I wonder, whether it is possible, to find a better form of the rank()-query or an additional index, that gives me the same performance.
To explain my case I created the following example (if you try it, be aware that depending on the size of your dba_objects view you might need up to half a gig free space in your tablespace for this example).
create table big_objects
as
select
ascii(m.alpha)*100000+o.object_id object_id,
o.owner owner,
o.object_type,
m.alpha||'_'||o.object_name object_name,
sysdate-400+mod(100*object_id+99*ascii(m.alpha),365)+24/(o.object_id+ascii(m.alpha)) created,
o.status
from
(select distinct
upper(substr(object_name,1,1)) alpha
from
sys.dba_objects
where
upper(substr(object_name,1,1)) between 'A' and 'Z') m,
sys.dba_objects o
order by
object_name;
create index bigindex_1 on big_objects (owner, object_type, created);
analyze table big_objects compute statistics;
So my table looks a bit like dba_objects but with much more rows and I made a synthetic "created" date which is more similar to my real case, where top-n means a date selection of the newest records from a certain type.
Here is the size of the segments on an nearly empty 11gR2 database:
select segment_name, bytes, blocks from sys.dba_segments where segment_name like 'BIG%'
SEGMENT_NAME BYTES BLOCKS
BIGINDEX_1 75497472 9216
BIG_OBJECTS 142606336 17408
On my database the example table has approx. 1,9 Mio rows:
select count(*) from big_objects;
COUNT(*)
1884246
and some 1,4% of those rows have owner = 'SYS' and object_type = 'INDEX'
select
count(*)
from big_objects
where owner = 'SYS'
and object_type = 'INDEX';
COUNT(*)
25896
But I want to find only the 10 newest indexes for the owner SYS. I think the typical rank() approach would be:
select
owner,
object_type,
object_name,
object_id,
status,
created
from
( select
owner,
object_type,
object_name,
object_id,
status,
created,
rank() over (order by created desc) rnk
from
big_objects
where
owner = 'SYS'
and object_type = 'INDEX')
where rnk <= 10
order by created asc;
OWNER OBJECT_TYPE OBJECT_NAME OBJECT_ID STATUS CREATED
SYS INDEX B_COLLELEMIND 6600515 VALID 15.04.2010 19:05:55
SYS INDEX V_I_WRI$_OPTSTAT_IND_OBJ#_ST 8600466 VALID 15.04.2010 19:09:03
SYS INDEX G_I_RLS 7100375 VALID 15.04.2010 19:23:55
SYS INDEX V_I_DIR$SERVICE_UI 8600320 VALID 15.04.2010 19:31:33
SYS INDEX L_I_TSM_DST2$ 7600308 VALID 15.04.2010 19:36:26
SYS INDEX L_I_IDL_UB11 7600235 VALID 15.04.2010 19:57:34
SYS INDEX V_I_VIEWTRCOL1 8600174 VALID 15.04.2010 20:19:21
SYS INDEX L_I_TRIGGER2 7600162 VALID 15.04.2010 20:31:39
SYS INDEX L_I_NTAB1 7600089 VALID 15.04.2010 21:35:53
SYS INDEX B_I_SYN1 6600077 VALID 15.04.2010 22:08:07
10 rows selected.
Elapsed: 00:00:00.22
Execution Plan
Plan hash value: 2911012437
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1427 | 188K| 1400 (1)| 00:00:17 |
| 1 | SORT ORDER BY | | 1427 | 188K| 1400 (1)| 00:00:17 |
|* 2 | VIEW | | 1427 | 188K| 1399 (1)| 00:00:17 |
|* 3 | WINDOW SORT PUSHED RANK | | 1427 | 79912 | 1399 (1)| 00:00:17 |
| 4 | TABLE ACCESS BY INDEX ROWID| BIG_OBJECTS | 1427 | 79912 | 1398 (0)| 00:00:17 |
|* 5 | INDEX RANGE SCAN | BIGINDEX_1 | 1427 | | 9 (0)| 00:00:01 |
Predicate Information (identified by operation id):
2 - filter("RNK"<=10)
3 - filter(RANK() OVER ( ORDER BY INTERNAL_FUNCTION("CREATED") DESC )<=10)
5 - access("OWNER"='SYS' AND "OBJECT_TYPE"='INDEX')
Statistics
1 recursive calls
0 db block gets
25870 consistent gets
0 physical reads
0 redo size
1281 bytes sent via SQL*Net to client
524 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
2 sorts (memory)
0 sorts (disk)
10 rows processed
As from the index only the first two columns are used, all the 25896 records that I found above are read and sorted just to find the ten newest ones. Many unnecessary blocks are read and luckily all needed database blocks were in memory already. In our real case quite often a lot of physical reads are performed, which makes the performance of the application even worse.
In my following example with a "rownum <= 10" all three columns of the index are used and the number of block gets is much, much smaller than in the rank() example.
select
owner,
object_type,
object_name,
object_id,
status,
created
from
big_objects
where
(owner, object_type, created)
in
( select
owner,
object_type,
created
from
( select /*+ first_rows(10) */
owner,
object_type,
created
from
big_objects
where
owner = 'SYS'
and object_type = 'INDEX'
order by
owner,
object_type,
created desc
where rownum <= 10
order by created asc;
OWNER OBJECT_TYPE OBJECT_NAME OBJECT_ID STATUS CREATED
SYS INDEX B_COLLELEMIND 6600515 VALID 15.04.2010 19:05:55
SYS INDEX V_I_WRI$_OPTSTAT_IND_OBJ#_ST 8600466 VALID 15.04.2010 19:09:03
SYS INDEX G_I_RLS 7100375 VALID 15.04.2010 19:23:55
SYS INDEX V_I_DIR$SERVICE_UI 8600320 VALID 15.04.2010 19:31:33
SYS INDEX L_I_TSM_DST2$ 7600308 VALID 15.04.2010 19:36:26
SYS INDEX L_I_IDL_UB11 7600235 VALID 15.04.2010 19:57:34
SYS INDEX V_I_VIEWTRCOL1 8600174 VALID 15.04.2010 20:19:21
SYS INDEX L_I_TRIGGER2 7600162 VALID 15.04.2010 20:31:39
SYS INDEX L_I_NTAB1 7600089 VALID 15.04.2010 21:35:53
SYS INDEX B_I_SYN1 6600077 VALID 15.04.2010 22:08:07
10 rows selected.
Elapsed: 00:00:00.03
Execution Plan
Plan hash value: 3360237620
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 10 | 760 | 17 (0)| 00:00:01 |
| 1 | SORT ORDER BY | | 10 | 760 | 17 (0)| 00:00:01 |
| 2 | NESTED LOOPS | | | | | |
| 3 | NESTED LOOPS | | 10 | 760 | 17 (0)| 00:00:01 |
| 4 | VIEW | VW_NSO_1 | 10 | 200 | 2 (50)| 00:00:01 |
| 5 | HASH UNIQUE | | 10 | 200 | 4 (25)| 00:00:01 |
|* 6 | COUNT STOPKEY | | | | | |
| 7 | VIEW | | 11 | 220 | 3 (0)| 00:00:01 |
|* 8 | INDEX RANGE SCAN DESCENDING| BIGINDEX_1 | 1427 | 28540 | 3 (0)| 00:00:01 |
|* 9 | INDEX RANGE SCAN | BIGINDEX_1 | 3 | | 2 (0)| 00:00:01 |
| 10 | TABLE ACCESS BY INDEX ROWID | BIG_OBJECTS | 3 | 168 | 6 (0)| 00:00:01 |
Predicate Information (identified by operation id):
6 - filter(ROWNUM<=10)
8 - access("OWNER"='SYS' AND "OBJECT_TYPE"='INDEX')
9 - access("OWNER"="OWNER" AND "OBJECT_TYPE"="OBJECT_TYPE" AND "CREATED"="CREATED")
Statistics
1 recursive calls
0 db block gets
26 consistent gets
0 physical reads
0 redo size
1281 bytes sent via SQL*Net to client
524 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
1 sorts (memory)
0 sorts (disk)
10 rows processed
I made this comparison with the Oracle versions 10.2 and 11.2 and the result was more or less the same. How can I change the rank() query in a way that only the small number of really needed blocks are read from the database?

this was exactly the hint, I was looking for. Generally speaking hints are not the preferred way to go to tune queries. They can have nasty side-effects when data changes.
Now the rank()-query is similar fast and much better to read than my fast one with three nested SELECTs.
Your rownum query was needlessly complicated, and could be simplified to:
select owner, object_type, object_name, object_id, status, created
from (select owner, object_type, created
      from big_objects
      where owner = 'SYS' and
            object_type = 'INDEX'
      order by created desc)
where rownum <= 10
order by created ascand very likely get the same speed.
One more question. How did you format those sql queries and results. When I copy/paste them into the editor of forums.oracle.com the format allways gets lost.To preserve formatting use {noformat}{noformat} before and after the section you want ot keep formatted. In general, if you want to see how someone generated an effect, reply to the post and hit the quote original icon. You will see all the formatting codes used in the original.
John

On my iPad2, the buttons for Top Ten, Genres and New Releases are missing. How do I get them back.

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If the menu bar is hidden then press the F10 key or hold down the Alt key, that should make the menu bar appear.
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Hi All,
I want to write an ABAP routine to get the Top 10 material as per their sales data.
I have written a query where I have put condition (for Top 10).
But I need to create an APD taking this query as base query. But conditions fail to filter data when it comes into a transactional ODS via an APD.
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SB

Hi ,
You Need to read Data from the ODS for Top 10 Materials. I can give you the Logic but you would need to take the Help of an ABAPPER to convert this into the code
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*****Define Internal Table ****************
TABLES :
/BIC/AZODS
DATA:
BEGIN of ITAB OCCURS 0,
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    ZKF           like /bic/AZODS-/bic/ZKF,
END OF ITAB.
DATA:
BEGIN of ITAB1 OCCURS 0,
    0material(18)       TYPE c,
    ZKF           like /bic/AZODS-/bic/ZKF,
END OF ITAB1.
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LOOP AT ITAB1
ITAB-MATERIAL = ITAB1-MATERIAL
ITAB-ZKF= ITAB1-ZKF
COLLECT ITAB.
ENDLOOP.
SORT ITAB ZKF.
************this will have the materials sorted take the first 10 Material Nos*****

ALV REPORT FOR TOP 10 CUSTOMERS

hI,
sap guys
I need a help on alv. iam getting alv report. now i need to get TOP 10 customers in my report.
My report having selling price , cost price , GP , GP% .
Final internal table iam sorting based on Selling price. But how to Get the Top 10 customers in my report.
Plz help me..

hi
good day brother
Before youve given the solution for top 20 cust as well as subtot.. iam getting a prob for one branch for subtot.
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Ive dev the smart form for top 20 customers by Branch wise.. I have 17 branches in final itab.
Every thing is fine except one branch for the Subtot.
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lt_br_out14 ==170
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Actually iam counting the top 20 cust as well as cal subtot and passing to Final Internal Table..
SORT lt_br_out13 BY p1_a_p DESCENDING.
CLEAR : lwa_out6.
LOOP AT lt_br_out13 INTO lwa_out6.
    IF sy-tabix > 20.
      CLEAR: lwa_out6.
***adding the subtot
      lwa_out6-ort01 = lv_text.
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      lwa_out6-p2_a_p = lv_brtot1.
      lwa_out6-act_gross_p = lv_br.
      lwa_out6-act_gross_perc1 = lv_brperc1.
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      EXIT.
    ELSE.
***calc the sub tot
      lv_text    = 'Sub Total'.
      lv_brtot   = lv_brtot + lwa_out6-p1_a_p. " selling price
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      lv_brperc   = ( lv_br / lv_brtot ) * 100.
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        WRITE lv_brperc TO lv_brperc1 LEFT-JUSTIFIED.
        CONCATENATE lv_brperc1 '%' INTO lv_brperc1 SEPARATED BY space.
      ENDIF.
      APPEND lwa_out6 TO lt_br_final.
    ENDIF.
ENDLOOP.
If i put sy-tabix >= 20, thne iam getting subtotal but iam getting only 19 records.
Could u plz advice me.. Ive solved yesterday problem
Regards

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Standard Query for Top 10 queries and Users

Hi Experts,
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Regards,
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Vamsi

Hi,
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I am using the sales overview cube 0SD_C03 to get top 10 selling products. What I want is to get the current stock available of the top 10 products from Material Stocks/Movements cube 0IC_C03. From what I know, we have to make a multiprovider to get this information. Can anyone guide me how to go about it?

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3. In Report B and assing the Report A to this variable.
When you execute the Report B it will execute the Report A in background and displays it in Report B.
Hope it helps,
thanks
Chandran

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oracle query for top two salary departmentwise

sigh...
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http://www.oracle.com/technology/oramag/oracle/07-jan/o17asktom.html
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:2853107469873
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Thanks.

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Top 20 (details) for top 20 (summary)

I have a query whose structure is somewhat like:
select distinct c,t, cu, s, somenumber, all
from
(-- outermost
    SELECT
    t, c, cu,somenumber,all,c_cd, cname
    FROM ...
    where ...
    and c_cd in
                   (--1st
                    select c_cd from
                        (--2nd
                        select c_cd, name,somenumber,ALL
                        from
                        (-- 3rd
                           SELECT c_cdc cname,
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                            FROM
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                            ORDER BY somenumber desc
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where rownum <=20
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                        )-- 1st
group by t,cu, c_cd, cname
order by somenumber desc
)-- outermost
where rownum <=20 -- this wont return top 20 per c_cd because no group by. How can I get top 20 details (outer query) for top 20 summary c_cd's (summary inner query)
order by somenumber desc what I am trying to do here is:
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However I am not able to say that give me the top 10 details for the give 20 c_cd's.
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Is there some reason you can't accomplish what you want, far more easily, using analytic functions?
http://tahiti.oracle.com
http://asktom.oracle.com
http://www.psoug.org/library.html

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