Comparing Top-n queries for performance

I would like to know which version of the query is performance efficient.
Query1: Using analytic functions:
select * from (
select pv.vendor_name, aia.invoice_num
, aia.invoice_date, aia.invoice_amount
,pvs.vendor_site_code,att.name terms
*,row_number() OVER (ORDER BY aia.invoice_id) AS row_num*
from ap_invoices_all aia, po_vendors pv
,po_vendor_sites_all pvs,ap_terms_tl att
where aia.vendor_id = pv.vendor_id
and pv.vendor_id= pvs.vendor_id
and pvs.vendor_site_id = aia.vendor_site_id
and pvs.terms_id=att.term_id
and att.language=userenv('LANG')
and aia.invoice_date between to_date('01-Jan-96','DD-MM-RR')
and to_date('31-Dec-09','DD-MM-RR')
where row_num<1000
Query2: Using Sort and Filter:
select * from (
select pv.vendor_name, aia.invoice_num
, aia.invoice_date, aia.invoice_amount
,pvs.vendor_site_code,att.name terms
from ap_invoices_all aia, po_vendors pv
,po_vendor_sites_all pvs,ap_terms_tl att
where aia.vendor_id = pv.vendor_id
and pv.vendor_id= pvs.vendor_id
and pvs.vendor_site_id = aia.vendor_site_id
and pvs.terms_id=att.term_id
and att.language=userenv('LANG')
and aia.invoice_date between to_date('01-Jan-96','DD-MM-RR')
and to_date('31-Dec-09','DD-MM-RR')
order by aia.invoice_id
where rownum<1000
I have tried to get the 'Explain plan', I dont see cost differences. But there is a difference in the way the operation is performed.
I would like to know which one is efficient, analytic functions or the other way.
Thanks.

Read Hoek's response and the link he posted carefully
If you want to know which of two queries is more efficent you will have to do some work: get execution plans and run metrics to compare the two. The fact that the operations are different suggests one may be more efficient than the other but you need the run metrics to tell.
Don't rely on cost. The cost, bytes, and other execution plan metrics are estimates and may not perform as expected.
The metrics I use to measure queries are run time, disk reads, memory reads, and cpu. The run time is okay but needs the other metrics to support - lower run time consistently is good but the other metrics help explain why. I get the disk reads and memory reads from AUTOTRACE (easier) or tkprof (more work), and CPU usage can come from V$SQL (if you can find the query you're running; sometimes its hard) or again tkprof reports.

Similar Messages

Top 10 Queries in Database...

Hello Guys,
My boss wants to know the database queries ran in last 10 days. What is the best way to get this informatiom.
He also wants to know the top 10 heavy quries that took the most cpu resources and time.
We have database 10g release 2 and OEM is working.
Please help.
Regards, Imran

This information is not available. Oracle does not keep a log of queries. Perhaps it would have been good if you boss had come to you and asked for all of the queries that run over the next 10 days -- that would be more doable.
Some of the info may be available from grid control. To get the top 10 queries, you can use statspack to take a snapshot, then some time later, take another and run the report. The top 10 queries for that time interval, by various measures, will be in the report.

Comparing SELECTs for performance

I have a long-running function module and through SAT, I've identified its SELECT from BSEG as a potential hotspot and way that I can improve the run time, etc.
Through some research in SCN, I found I can/should use one of the component tables (BSID) to improve performance, but I don't know *how much* of an improvement it will be.
Rather than change the code of the FM and transport it to QA just to analyze performance gains, I was hoping there was some sort of tool that I could use to analyze separate code comparatively.
I thought of making 2 Quickviewer queries (one for BSEG and one for BSID) and then using ST05 to analyze each. Is there a better way?
Basically in PRD, I'd like to compare isolated SELECTs for performance to see what gains I could make.
Thanks
Jeremy H.

You can find some interesting discussions linked here, some also talk about index access:
FAQ's, intros and memorable discussions in the ABAP Testing and Troubleshooting Space
Regarding your point 4), make sure your WHERE-condition contains as many fields of the index top down without gaps.
Looking at BSID~4:
MANDT
Client
BUKRS
Company Code
REBZG
Number of the Invoice the Transaction Belongs to
REBZJ
Fiscal Year of the Relevant Invoice (for Credit Memo)
REBZZ
Line Item in the Relevant Invoice
KUNNR
Customer Number
UMSKS
Special G/L Transaction Type
REBZT
Follow-On Document Type
MANDT will be included automatically. BUKRS is not very selective (not many distinct values), but you must include it since it is the leading field of the index. REBZG sounds like a selective field, so you can likely use the index effectively by having just BUKRS and REBZG in your WHERE-condition, but the more the better.
Also have a look at transactions DB05 and TAANA which can give you a good idea about the actual data distribution.
Thomas

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

Standard Query for Top 10 queries and Users

Hi Experts,
Is there any query which gives the details like ,
1. Top 10 queries executed in a month
2. Top 10 users ( By no of queries executed )
Regards,
Bhadri M.

1. Top 10 queries executed in a month
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Similarly you have to modify this query.
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SQL queries for finding values in 4 different tables

I need to have certain queries to find specific data in this table, this is just an example table, but I will use the same ideas for my actual website and database.
customers (customerID: integer, fName: string, lName: string)
items (itemID: integer, description: string, price: float)
orders (orderID: integer, itemID: integer, aID: integer, customerID: integer, date: date)
addresses (aID: integer, housenum: integer, streetName: string, town:string, state: string, zip:integer)
Values I need to find are
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customers.lName,
COUNT(orders.itemID) AS `total items with diff address >= 2`
FROM customers
JOIN (SELECT customerID,itemID,
COUNT(DISTINCT aID) AS diff_address
FROM orders
GROUP BY orders.itemID
HAVING diff_address >= 2
) AS orders
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Thanks for the help and I appreciate you taking the time to help me

Why not post the sample data + desired result? Always state what version you are using.
SELECT lname,A.aID,COUNT(*) cnt FROM customers C JOIN orders O ON c.Customerid=O.Customerid
JOIN address A ON A.aID=O.aID
GROUP BY lname,aID
Sorry cannot test it right now...
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
MS SQL optimization: MS SQL Development and Optimization
MS SQL Consulting:
Large scale of database and data cleansing
Remote DBA Services:
Improves MS SQL Database Performance
SQL Server Integration Services:
Business Intelligence

How to Find out what are the top 20 queries executed in the system

Hi Guru's,
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Thanks and regards,

Hi,
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Hope this helps.
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I am using i 4 phone. recently I had a problem with my lap top and had formatted hard disk of it. Now I want to use sync data in my iphone back to itune n my lap top. how can I perform this task with out loosing data in my i phone.

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Hey floridiansue,
Do you have an installed email program such as Microsoft Outlook? If your email is through an online login, such as Gmail, etc, then one will have to create an email association with a program such as Microsoft Outlook on the PC for this Scan to Email system to function.
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Requiring several database queries for my GUI - where to put the reads?

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Hi all,
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e.g,
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thanks in advance,
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BigDaddyLoveHandles wrote:
walker8 wrote:
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Top 10 queries in oracle 9i

Hi,
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Hello
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Andy

Hi AndyMcV,
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Data Source Level SRS (SSRS) Issue - Permissions granted to user... are insufficient for performing this operation. (rsAccessDenied)

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DataBaseA_readers (in SQL Server, at the DatabaseB level) is a member of role db_datareader.
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Thank you. Sorry for the verbosity.

Hi Steve,
After testing the issue in my local environment, I can reproduce it. The Home Folder has Security for "DomainX\SSRS_Browsers" group with "Browser" Role, the folder “X” and Report “A” security is inherited from its parent item, but the Report “B” Item security
is not inherited from its parent item. In this way, the DomainX\UnhappyUser has insufficient permission to render the Report “B”.
So, please try to check the Security page of Report “B” and compare it with Report “A” security settings. If possible, we can click “Revert to Parent Security” button to replace all the defined security settings with the security settings of its parent folder
”X”.
Hope this helps.
Thanks,
Katherine Xiong
Katherine Xiong
TechNet Community Support

Top-of-page for list display thru ALV

Hi All,
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FORM User_command.
WHEN '&IC1'.
PERFORM LIST_DISPLAY using RS_SELFIELD-tabindex.
ENDFORM.
FORM LIST_DISPLAY USING    P_INDEX.
LEAVE TO LIST-PROCESSING AND RETURN TO SCREEN 500.
SET PF-STATUS space.
SUPPRESS DIALOG.
Read table g_t_sum index p_index.
loop at g_t_emp where code = g_t_sum-code and
                      keyfld = g_t_sum-keyfld
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endloop.
ENDFORM.
The above write statment is not trigerring either top-of-page ot top-od-page during line-selection.
I have even tried pushing the event and form name into it it_events..
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Thanks in advance
Regards,
Mangalagi S V

Hi All,
Thanks for all your replies.
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Ausgaberoutine mit FB REUSE_ALV_GRID_DISPLAY
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
       EXPORTING
          i_callback_program          = g_f_repid
          i_callback_pf_status_set    = 'SET_PF_STATUS'
          i_callback_user_command     = 'USER_COMMAND'
          i_callback_top_of_page      = 'TOP_OF_PAGE'
          is_layout                   = g_r_layout
          it_fieldcat                 = g_t_fcat
          i_save                      = 'A'
         is_variant                  = s_variant         "70492INF0039
          is_variant                  = g_f_variant        "70492INF0039
          is_events                   = it_events[]
       TABLES
           t_outtab                    = g_t_sum.
      FORM USER_COMMAND                                             *
     Callbackroutine: Ausgabe Fehlerliste             XDGL9CK069538 *
FORM USER_COMMAND USING R_UCOMM
                        RS_SELFIELD TYPE SLIS_SELFIELD.
case r_ucomm.
when 'OK'.
WHEN '&IC1'.
PERFORM LIST_DISPLAY using RS_SELFIELD-tabindex.
endcase.
ENDFORM.
Kindly suggest
Thanks in advance.
Regards,
Mangalagi S V

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Oracle CPU Statistics
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