How to measure the performance of a SQL query?

Hello,
I want to measure the performance of a group of SQL queries to compare them, but i don't know how to do it.
Is there any application to do it?
Thanks.

You can use STATSPACK (in 10g its called as AWR - Automatic Workload Repository)
Statspack -> A set of SQL, PL/SQL, and SQL*Plus scripts that allow the collection, automation, storage, and viewing of performance data. This feature has been replaced by the Automatic Workload Repository.
Automatic Workload Repository - Collects, processes, and maintains performance statistics for problem detection and self-tuning purposes
Oracle Database Performance Tuning Guide - Automatic Workload Repository
http://download-east.oracle.com/docs/cd/B19306_01/server.102/b14211/autostat.htm#PFGRF02601
or
you can use EXPLAIN PLAN
EXPLAIN PLAN -> A SQL statement that enables examination of the execution plan chosen by the optimizer for DML statements. EXPLAIN PLAN causes the optimizer to choose an execution plan and then to put data describing the plan into a database table.
Oracle Database Performance Tuning Guide - Using EXPLAIN PLAN
http://download-east.oracle.com/docs/cd/B19306_01/server.102/b14211/ex_plan.htm#PFGRF009
Oracle Database SQL Reference - EXPLAIN PLAN
http://download-east.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_9010.htm#sthref8881

Similar Messages

How to measure the performance of sql query?

Hi Experts,
How to measure the performance, efficiency and cpu cost of a sql query?
What are all the measures available for an sql query?
How to identify i am writing optimal query?
I am using Oracle 9i...
It ll be useful for me to write efficient query....
Thanks & Regards

psram wrote:
Hi Experts,
How to measure the performance, efficiency and cpu cost of a sql query?
What are all the measures available for an sql query?
How to identify i am writing optimal query?
I am using Oracle 9i... You might want to start with a feature of SQL*Plus: The AUTOTRACE (TRACEONLY) option which executes your statement, fetches all records (if there is something to fetch) and shows you some basic statistics information, which include the number of logical I/Os performed, number of sorts etc.
This gives you an indication of the effectiveness of your statement, so that can check how many logical I/Os (and physical reads) had to be performed.
Note however that there are more things to consider, as you've already mentioned: The CPU bit is not included in these statistics, and the work performed by SQL workareas (e.g. by hash joins) is also credited only very limited (number of sorts), but e.g. it doesn't cover any writes to temporary segments due to sort or hash operations spilling to disk etc.
You can use the following approach to get a deeper understanding of the operations performed by each row source:
alter session set statistics_level=all;
alter session set timed_statistics = true;
select /* findme */ ... <your query here>
SELECT
         SUBSTR(LPAD(' ',DEPTH - 1)||OPERATION||' '||OBJECT_NAME,1,40) OPERATION,
         OBJECT_NAME,
         CARDINALITY,
         LAST_OUTPUT_ROWS,
         LAST_CR_BUFFER_GETS,
         LAST_DISK_READS,
         LAST_DISK_WRITES,
FROM     V$SQL_PLAN_STATISTICS_ALL P,
         (SELECT *
          FROM   (SELECT   *
                  FROM     V$SQL
                  WHERE    SQL_TEXT LIKE '%findme%'
                           AND SQL_TEXT NOT LIKE '%V$SQL%'
                           AND PARSING_USER_ID = SYS_CONTEXT('USERENV','CURRENT_USERID')
                  ORDER BY LAST_LOAD_TIME DESC)
          WHERE ROWNUM < 2) S
WHERE    S.HASH_VALUE = P.HASH_VALUE
         AND S.CHILD_NUMBER = P.CHILD_NUMBER
ORDER BY ID
/Check the V$SQL_PLAN_STATISTICS_ALL view for more statistics available. In 10g there is a convenient function DBMS_XPLAN.DISPLAY_CURSOR which can show this information with a single call, but in 9i you need to do it yourself.
Note that "statistics_level=all" adds a significant overhead to the processing, so use with care and only when required:
http://jonathanlewis.wordpress.com/2007/11/25/gather_plan_statistics/
http://jonathanlewis.wordpress.com/2007/04/26/heisenberg/
Regards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/

Inner Join. How to improve the performance of inner join query

Inner Join. How to improve the performance of inner join query.
Query is :
select f1~ablbelnr
         f1~gernr
         f1~equnr
         f1~zwnummer
         f1~adat
         f1~atim
         f1~v_zwstand
         f1~n_zwstand
         f1~aktiv
         f1~adatsoll
         f1~pruefzahl
         f1~ablstat
         f1~pruefpkt
         f1~popcode
         f1~erdat
         f1~istablart
         f2~anlage
         f2~ablesgr
         f2~abrdats
         f2~ableinh
            from eabl as f1
            inner join eablg as f2
            on f1ablbelnr = f2ablbelnr
            into corresponding fields of table it_list
            where f1~ablstat in s_mrstat
            %_HINTS ORACLE 'USE_NL (T_00 T_01) index(T_01 "EABLG~0")'.
I wanted to modify the query, since its taking lot of time to load the data.
Please suggest : -
Treat this is very urgent.

Hi Shyamal,
In your program , you are using "into corresponding fields of ".
Try not to use this addition in your select query.
Instead, just use "into table it_list".
As an example,
Just give a normal query using "into corresponding fields of" in a program. Now go to se30 ( Runtime analysis), and give the program name and execute it .
Now if you click on Analyze button , you can see, the analysis given for the query.The one given in "Red" line informs you that you need to find for alternate methods.
On the other hand, if you are using "into table itab", it will give you an entirely different analysis.
So try not to give "into corresponding fields" in your query.
Regards,
SP.

How to measure the performance of Extractor

Hi,
How to measure the time taken to by the extractor when executed from rsa3 for a given selection?
Lot of threads speak about ST05... but these transactions are too granular to analyse.
How to get the overall time taken.i need the overall time taken and the time taken by the individual SQL statements... please provide specific pointers.
Thanks,
Balaji

Maybe SE30 can help you....
Regards,
Fred

How to measure the performance

Hi all,
I would like to compare the performance of my Webdynpros in different machine. I need to measure the time of execution of my Web dynpro, including execution of some interaction from the user (navigation between the pages, etc). How can I do it? I cannot add any additional code, are there any transaction to measure it?
Thanks a lot,
Anna

Thank you.
I opened this transaction, but I could see only Transaction, Program or Function module to introduce and analyze. How can I measure Webdynpro?
Regards,
Anna

How to Suppress The Output of a SQL Query In Oracle 11gR2

Hi Friends,
I am using oracle version 11.2.0.1, I have set a cronjob which will run on every 15 minutes and give us a log file mentioning the execution time taken for that SQL query:-
For example:
SQL> set timing on;
SQL> SELECT objProp FROM aradmin.arschema WHERE (schemaId = 175);
OBJPROP+
--------------------------------------------------------------------------------+
*6\60006\4\0\\60008\40\0\60009\4\0\\60010\4\0\\60018\4\0\\600*
*22\4\68\1\63\AR:jRL#*
Elapsed: 00:00:00.00
The above query will return the output as well as the time taken for execution of the query. I want to suppress the output of the query and only want the time taken to be printed. Is it possible by set commands. I have marked the output as bold and made it Italic.
Please help me at the earliest.
Regards,
Arijit

>
I am using oracle version 11.2.0.1, I have set a cronjob which will run on every 15 minutes and give us a log file mentioning the execution time taken for that SQL query:-
The above query will return the output as well as the time taken for execution of the query. I want to suppress the output of the query and only want the time taken to be printed. Is it possible by set commands. I have marked the output as bold and made it Italic.
>
How would that even be useful?
A query from a tool such as sql*plus is STILL going to send the output to the client and the client. You can keep sql*plus from actually displaying the data by setting autotrace to trace only.
But that TIME TAKEN is still going to include the network time it takes to send ALL rows that the query returns across the network.
That time is NOT the same as the actual execution time of the query. So unless you are trying to determine how long it takes to send the data over the network your 'timing' method is rather flawed.
Why don't you tell us WHAT PROBLEM you are trying to solve so we can help you solve it?

How to Use the Procedures in a Sql Query

Hi Friends,
Can anyone help me out whether can we use the procedure in the sql query..
if yes help me out with an example
my requirement is
i have one sql query .. in which i need to use the procedure which returns multiple values... how can i overcome it,can anyone help me out for this..
for your reference i am pasting the sql query
SELECT paf.person_id
FROM per_all_assignments_f paf START WITH paf.person_id = p_person_id
AND paf.primary_flag = 'Y'
AND paf.assignment_type IN('E', 'C')
AND l_effective_date BETWEEN paf.effective_start_date
AND paf.effective_end_date
CONNECT BY PRIOR paf.supervisor_id = paf.person_id
AND paf.primary_flag = 'Y'
AND paf.assignment_type IN('E', 'C')
AND l_effective_date BETWEEN paf.effective_start_date
AND paf.effective_end_date
and paf.person_id not in (>>>I HAVE TO USE THE PROCEDURE HERE<<<<);
Thanks in advance

We never saw your procedure, but maybe you could wrap it in a function
SQL> create or replace procedure get_members(in_something IN number, out_members OUT sys_refcursor)
is
begin
open out_members for
    'select level member_id from dual connect by level <= :num' using in_something;
end get_members;
Procedure created.
SQL> create or replace type numbers as table of number;
Type created.
SQL> create or replace function members(in_something IN number)
return numbers
as
member_cur sys_refcursor;
members numbers;
begin
get_members(in_something, member_cur);
fetch member_cur bulk collect into members;
close member_cur;
return members;
end;
Function created.
SQL> select * from table(members(4));
COLUMN_VALUE
           1
           2
           3
           4
4 rows selected.Variant on same using piplined function
SQL> create or replace function members_piped(in_something IN number)
return numbers pipelined
as
member_cur sys_refcursor;
rec number;
begin
get_members(in_something, member_cur);
loop
     fetch member_cur into rec;
     exit when member_cur%notfound;
     pipe row(rec);
end loop;
close member_cur;
return;
end;
Function created.
SQL> select * from table(members_piped(4));
COLUMN_VALUE
           1
           2
           3
           4
4 rows selected.
SQL> drop function members_piped;
Function dropped.
SQL> drop function members;
Function dropped.
SQL> drop type numbers;
Type dropped.
SQL> drop procedure get_members;
Procedure droppedEdit:
Sorry Blu, had not seen you already posted similar thing
Edited by: Peter on Jan 27, 2011 5:38 AM

How to increase the performance of an insert query?

Hi,
I am using oracle database for our application where we executes one insert query and need the performance of 300 insert queries to be executed per second.
As of now we are getting only 30/sec.We are not knowing how to tune the database for getting this performance.
we are doing all this though C programming under both linux and solaris environment.
Can u guide me in this issue.
Regards,
vamsi krishna

Performance tuning issue is not something you can get a straight forward answer for.
You need to look at various aspects of the system to get close to or increase the performance of your application. Tuning just the database might not give you want you want.
So, you need to look at the Application codes, Mermory, Disk IO, etc. Have a look at the Performance Tuning Guide from the Oracle Documentation Library for your Oracle Release and Operating System
http://www.oracle.com/technology/documentation/index.html#previous

How to tune the performance of Oracle SQL/XML query?

Hi all,
I am running Oracle 9i and like to run the following Oracle SQL/XML query. It takes about 3+ hour and still not finish. If I get rid all the XML stuffs it only take minutes to run. Does anybody know how to what's the reason of this slow and how to tune it?
SELECT XMLElement("CUSTOMER",
XMLForest(C_CUSTKEY "C_CUSTKEY", C_NAME "C_NAME", C_ADDRESS "C_ADDRESS", C_PHONE "C_PHONE", C_MKTSEGMENT "C_MKTSEGMENT", C_COMMENT "C_COMMENT"),
(SELECT XMLAgg(XMLElement("ORDERS",
XMLForest(O_ORDERKEY "O_ORDERKEY", O_CUSTKEY "O_CUSTKEY", O_ORDERSTATUS "O_ORDERSTATUS", O_ORDERPRIORITY "O_ORDERPRIORITY", O_CLERK "O_CLERK", O_COMMENT "O_COMMENT"),
(SELECT XMLAgg(XMLElement("LINEITEM",
XMLForest(L_ORDERKEY "L_ORDERKEY", L_RETURNFLAG "L_RETURNFLAG", L_LINESTATUS "L_LINESTATUS", L_SHIPINSTRUCT "L_SHIPINSTRUCT", L_SHIPMODE "L_SHIPMODE", L_COMMENT "L_COMMENT")
FROM LINEITEM
WHERE LINEITEM.L_ORDERKEY = ORDERS.O_ORDERKEY)
FROM ORDERS
WHERE ORDERS.O_CUSTKEY = CUSTOMER.C_CUSTKEY)
FROM CUSTOMER ;
Thanks very much in advance for your time,
Jinghao Liu

ajallen wrote:
Why not something more like
SELECT *
FROM fact1 l,
FULL OUTER JOIN fact1 d
ON l.company = d.company
AND l.transactiontypeid = 1
AND d.transactiontypeid = 2;
Because this is not an equivalent of the original query.
drop table t1 cascade constraints purge;
drop table t2 cascade constraints purge;
create table t1 as select rownum t1_id from dual connect by level <= 5;
create table t2 as select rownum+2 t2_id from dual connect by level <= 5;
select * from (select * from t1 where t1_id > 2) t1 full outer join t2 on (t1_id = t2_id);
select * from t1 full outer join t2 on (t1_id = t2_id and t1_id > 2);
     T1_ID      T2_ID
         3          3
         4          4
         5          5
                    6
                    7
     T1_ID      T2_ID
         1
         2
         3          3
         4          4
         5          5
                    6
                    7

How to use the result of a sql query for a max () function

Hi
I wrote a query on which i wrote
"select max(id) from users "
how can i use the returned value.
if i made the var name ="userid"
can it be userid.rows[0] or what.
thnx for any help

Hi!
The result of this query will be the max ID of users' IDs.
Let say we have:
String sql="select max(users.id) from users";
Statement st = ctx.conn.createStatement();
ResultSet rs = st.executeQuery(sql);
rs.next();
So you can get the max Id in the following way:
int maxId=rs.getInt("id");
Regards,
Rossi

How to write the output of an SQL query to a text file?

I am using Oracle 11g and SQL plus.
I have a large table called rating.
Whenever I do
SQL> select * from rating;
The output goes much beyond what the SQL Plus screen can show. I want to therefore store the output of this query into a text file.
How can this be done? Please help. Thanks.

SQL> SPOOL results.txt
SQL> select * from rating;
SQL> SPOOL OFF

How to get the desire output from sql query

Consider an Order Table: ...
Order Table:
Order Id Item Qty
O1 A1 5
O2 A2 1
O3 A3 3
Please provide SQL which will explode the above data into single unit level records as shown below
Desired Output:
Order Id Order Id Qty
O1 A1 1
O1 A1 1
O1 A1 1
O1 A1 1
O1 A1 1
O2 A2 1
O3 A3 1
O3 A3 1
O3 A3 1

How do I ask a question on the forums?
SQL and PL/SQL FAQ

Measuring the Performance

How to measure the Performance of an XI system and also an XI Interface?
What are all the ways we can tune an XI system for an optimal performance? i.e what are all the areas we have to look into for a superior performance?

Pete,
You can check the start time and end time of the message in sxmb_moni and can find out how much time it takes for the interface to execute.
Go to RWB and then click on performance monitoring. You can get for each interface individually or for the whole.
Also go thorugh this documents:
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/489f5844-0c01-0010-79be-acc3b52250fd
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/defd5544-0c01-0010-ba88-fd38caee02f7?prtmode=navigate
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/70ada5ef-0201-0010-1f8b-c935e444b0ad
/people/prasad.illapani/blog/2007/04/27/performance-tuning-checks-in-sap-exchange-infrastructurexi-part-iii
http://help.sap.com/saphelp_nw04/helpdata/en/9e/6921e784677d4591053564a8b95e7d/frameset.htm
---Satish

Pass the result of a SQL Query as table_name for another SQL Query

Hi All,
How to pass the result of a SQL Query as parameter to another SQL Query
Eg: I am doing the steps below.
1) select distinct table_name as TAB1 from all_tab_cols where table_name like 'T_%' and column_name like '%XYZ'
2) I want to pass the table_name from step 1 above as parameter to another query "select * from TAB1"
Thanks

Naveen B wrote:
Hi All,
How to pass the result of a SQL Query as parameter to another SQL Query
Eg: I am doing the steps below.
1) select distinct table_name as TAB1 from all_tab_cols where table_name like 'T_%' and column_name like '%XYZ'
2) I want to pass the table_name from step 1 above as parameter to another query "select * from TAB1"
ThanksYou should craete PL/SQL code with cursor which will accept a parameter and call that cursor inside the first one
But if the first sql returns only one row, you can do it with simple sql code
select * from (select distinct table_name as TAB1 from all_tab_cols where table_name like 'T_%' and column_name like '%XYZ')- - - - - - - - - - - - - - - - - - - - -
Kamran Agayev A. (10g OCP)
http://kamranagayev.wordpress.com
[Step by Step install Oracle on Linux and Automate the installation using Shell Script |http://kamranagayev.wordpress.com/2009/05/01/step-by-step-installing-oracle-database-10g-release-2-on-linux-centos-and-automate-the-installation-using-linux-shell-script/]

How can i use Bi-Technical Content is used for measuring the performance of

Hi
recenetly i implemented the BI7.0 for one client. I want to know how to use 'BI Administraction Cockpit,.
Actual what technical content does ???
And how can i use technical content or statistics for measuring the performance of my queries. Please let me know
kumar

Hi Ravi,
BI Admin Cockpit is enhancement of BW Statistics.
http://help.sap.com/saphelp_nw2004s/helpdata/en/44/08a75d19e32d2fe10000000a11466f/frameset.htm
Check this thread also:
BI Statistics comparision with the old
Regarding the performance check the link below.
Re: Query - Performance
http://help.sap.com/saphelp_nw2004s/helpdata/en/43/15c54048035a39e10000000a422035/frameset.htm
Regards,
Anil

How to measure the performance of a SQL query?

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