How to optimize execution time for code

Please suggest the way as i m new to performance tuning for reducing the execution time of code . Related document to performance tuning is appreciable .also tell how to work with Tcode ST05 .
Thanks in advance

Please Read before Posting in the Performance and Tuning Forum
Thread locked.
Thomas

Similar Messages

How to get execution time for a view inside procedure ?

Hi,
I want execution time for all the views in my database. I tried "execute immediate" but it does not seem to work.
It is not waiting to complete the execution of view to go to next step.
If I am executing the same statement in sqlplus, it is displaying correct time.
Here is my code:
Begin
output_file := UTL_FILE.FOpen ('RECORDING',v_FileName, 'W', 32767);
Open viewcur;
Loop
Fetch viewcur into v_view_name;
     Exit when viewcur%notfound;
     SELECT to_char(systimestamp,'DD-MON-YYYY HH24:MI:SS.FF') into v_start_time from dual;
     v_stmt := 'Select * from ' ||v_view_name ;
     Execute Immediate v_stmt;
SELECT to_char(systimestamp,'DD-MON-YYYY HH24:MI:SS.FF') into v_end_time from dual;
v_record_str := v_start_time||','||v_view_name||','||v_end_time;
     UTL_FILE.PUT_LINE(output_file, v_record_str);
End Loop;
Close viewcur;
utl_file.fClose(output_file);
End ;
Oracle version: 11.1.0.6.0

Hi,
Running with a user with dba privileges:
DECLARE
    CURSOR viewcur IS
        SELECT table_name
        FROM   dictionary d
        WHERE d.table_name LIKE 'ALL_A%';
    output_file UTL_FILE.file_type;
    v_FileName VARCHAR2(30) := 'TEST_VIEW_TIME.TXT';
    v_view_name dictionary.table_name%TYPE;
    v_start_time varchar2(30);
    v_end_time varchar2(30);
    v_record_str varchar2(200);
    v_stmt varchar2(200);
BEGIN
    output_file := UTL_FILE.FOpen('EXT_FILES', v_FileName, 'W', 32767);
    OPEN viewcur;
    LOOP
        FETCH viewcur
            INTO v_view_name;
        EXIT WHEN viewcur%NOTFOUND;
        SELECT TO_CHAR(systimestamp, 'DD-MON-YYYY HH24:MI:SS.FF')
        INTO   v_start_time
        FROM   dual;
        v_stmt := 'Select * from ' || v_view_name;
        EXECUTE IMMEDIATE v_stmt;
        SELECT TO_CHAR(systimestamp, 'DD-MON-YYYY HH24:MI:SS.FF')
        INTO   v_end_time
        FROM   dual;
        v_record_str := v_start_time || ',' || v_view_name || ',' || v_end_time;
        UTL_FILE.PUT_LINE(output_file, v_record_str);
    END LOOP;
    CLOSE viewcur;
    utl_file.fClose(output_file);
END;
/TEST_VIEW_TIME.TXT:
02-JUL-2009 11:48:47.953000,ALL_ARGUMENTS,02-JUL-2009 11:48:47.953000
02-JUL-2009 11:48:47.953000,ALL_ALL_TABLES,02-JUL-2009 11:48:47.953000
02-JUL-2009 11:48:47.953000,ALL_ASSOCIATIONS,02-JUL-2009 11:48:47.953000
02-JUL-2009 11:48:47.953000,ALL_AUDIT_POLICIES,02-JUL-2009 11:48:47.999000
02-JUL-2009 11:48:47.999000,ALL_AUDIT_POLICY_COLUMNS,02-JUL-2009 11:48:48.093000
02-JUL-2009 11:48:48.093000,ALL_AWS,02-JUL-2009 11:48:48.187000
02-JUL-2009 11:48:48.187000,ALL_AW_PS,02-JUL-2009 11:48:48.187000
02-JUL-2009 11:48:48.187000,ALL_APPLY,02-JUL-2009 11:48:48.343000
02-JUL-2009 11:48:48.343000,ALL_APPLY_PARAMETERS,02-JUL-2009 11:48:48.421000
02-JUL-2009 11:48:48.421000,ALL_APPLY_KEY_COLUMNS,02-JUL-2009 11:48:48.437000
02-JUL-2009 11:48:48.437000,ALL_APPLY_CONFLICT_COLUMNS,02-JUL-2009 11:48:48.781000
02-JUL-2009 11:48:48.781000,ALL_APPLY_TABLE_COLUMNS,02-JUL-2009 11:48:48.828000
02-JUL-2009 11:48:48.828000,ALL_APPLY_DML_HANDLERS,02-JUL-2009 11:48:48.890000
02-JUL-2009 11:48:48.890000,ALL_APPLY_PROGRESS,02-JUL-2009 11:48:48.968000
02-JUL-2009 11:48:48.968000,ALL_APPLY_ERROR,02-JUL-2009 11:48:49.015000
02-JUL-2009 11:48:49.015000,ALL_APPLY_ENQUEUE,02-JUL-2009 11:48:49.234000
02-JUL-2009 11:48:49.234000,ALL_APPLY_EXECUTE,02-JUL-2009 11:48:49.281000
02-JUL-2009 11:48:49.281000,ALL_AW_PROP,02-JUL-2009 11:48:49.531000
02-JUL-2009 11:48:49.546000,ALL_AW_OBJ,02-JUL-2009 11:48:49.578000
02-JUL-2009 11:48:49.578000,ALL_AW_PROP_NAME,02-JUL-2009 11:48:49.609000
02-JUL-2009 11:48:49.609000,ALL_AW_AC,02-JUL-2009 11:48:49.624000
02-JUL-2009 11:48:49.624000,ALL_AW_AC_10G,02-JUL-2009 11:48:49.640000Regards,

How to optimize execution time of lot commands

hello,
in my plugin i do a lot of textinsert cmds, delete cmds, attribute setting cmds. now i wonder why this process is very slow.
how can i execute many commands as fast as possible?
disable a command/undo stack? how?
thanks,
juergen

IDataBase *myDB = ...;
ASSERT(myDB );
myDB ->BeginTransaction();
InterfacePtr<ICommandMgr> commandMgr(temporyDoc, UseDefaultIID());
ASSERT(commandMgr);
commandMgr->SetUndoSupport(kFalse);
myDB ->EndTransaction();

Execution time for web reports

Hello every one,
How to calculate execution time for web reports, for query execution we will go through RSRT, by giving query name and press execute + Debug button then select statistical data & Do not Cache buttons then press enter, after getting output press on back button, we will get duration of the query.....
But my question is , can we calculate execution time for webreport, if so can you please guide me.
and can you also tell me , if there is any RRI for one report, how to calculate execution time for these queries.
Ex : Query ABC have XYZ as its drilldown report , i need to calculate execution time for XYZ report via ABC report.
Thanks in advance,
Best Regards.
NP.

Hi,
For reports executed in java web you can add the parameter &PROFILING=X
to the URL in order to record the execution time. Please have a look at SAP note 1048691 for further information.
Best regards,
Janine

How to find the Execution Time for Java Code?

* Hi everyone , i want to calculate the execution time for my process in java
* The following was the ouput for my coding,
O/P:-
This run took 0 Hours ;1.31 Minutes ;78.36 Seconds
*** In the above output , the output should come exactly what hours , minutes and seconds for my process,
but in my code the minutes are converted into seconds(It should not)...
* Here is my coding,
    static long start_time;
    public static void startTime()
        start_time = System.currentTimeMillis();
    public static void endTime()
        DecimalFormat df = new DecimalFormat("##.##");
        long end_time = System.currentTimeMillis();
        float t = end_time - start_time;
        float sec = t / 1000;
        float min = 0, hr = 0;
        if (sec > 60) {
            min = sec / 60;
        if (min > 60) {
            hr = min / 60;
        System.out.println("This run took " + df.format(hr) + " Hours ;"+ df.format(min) + " Minutes ;" + df.format(sec) + " Seconds");
    }* How to Calcualte exact timing for my process....
* Thanks

* Hi flounder, Is following code will wotk perfectly?
     public static void endTime()
          DecimalFormat df = new DecimalFormat("##.##");
          long end_time = System.currentTimeMillis();
          float t = end_time - start_time;
          float sec = t / 1000;
          float min = 0, hr = 0;
          while(sec >= 60){
     min++;
     sec = sec -60;
     if (min >= 60){
     min = 0; //or min = min -60;
     hr++;
          System.out.println("This run took " + df.format(hr) + " Hours ;"+ df.format(min) + " Minutes ;" + df.format(sec) + " Seconds");
     }

Execution Time for T.Code

Hi Experts,
I want to know the exact execution time for a t.code. I check it in ST03 or ST03n but I can't get proper data. In ST03 I get the average and total response time but I want the exact ececution or response time.
Waiting for your inputs.
Regards,
Nisit

From SAP
For old verions
In ST03 transaction
click on "Performance Database" tab
Then double click on Total
It will open Dialogue box CHOOSE TIME PERIOD ,select the time period and then click on the required date
Then Click on Transaction Profile ,here it will give the list of transaction executed and its execution time
In STO3N , you will find "TRANSACTION PROFILE" under Analysis views, when you double click on it will give present days Transaction codes executed.
If you want the month data then go to Export mode in ST03n ,you will get the data "TRANSACTION PROFILE" under Analysis views .
Regards,
Beena

How can i calculate execution time for methods?

I'm making a project that i want to calculate execution time for a
method in "miliseconds" or "microseconds".You see,I have a sort algorithm and i want to calculate execution time of this algorithm.How can i do?
Thanks...

Just remembered.
The answer you get isn't trustworthy below a hundred millis, so you may need to sort a hundred or a thousand times to get a reasonable elapsed time. You also need to run the test five or ten times and take an average. In Windows you should fire up the Task Manager and be sure that your other CPU usage is as near to zero as you can get.

Can I reduce the execution time for a step in a TestStand ?

Hi,
I calculated the a single step execution time for TestStand Ver 2.0. It comes to around 20 milliseconds/step. Can I reduce this excution time ?
Are there any settings available for configuring execution time parameters except result logging and exception handlings to reduce the execution time ?

It's difficult to tell how you what time you are reporting for your step. Clearly we don't have control of the time it takes your code to execute. However, we are constantly working on reducing the overhead of calling the code. In addition, you don't mention the type of step you are calling. One way to have a common reference is to use the example \Examples\Benchmarks\Benchmarks.seq. Below have have posted the results of running this sequence with both tracing and result collection enabled and then disabled. I have a 700 MHz, 128 MB RAM, Dell PIII laptop. In this example there is no code within the code modules. You notice that calling a DLL has the least overhead with a minimum of 7.459 ms with tracing and results enabled and 0.092 ms with tracing and results disabled. Although not included below, if I enable results be disable tracing I get a minimum time of 0.201 ms, a 100x improvement on your time.
With Results and Tracing enabled.
7.578 milliseconds per step for CVI Standard Prototype - Object File
7.579 milliseconds per step for CVI Standard Prototype - DLL
7.459 milliseconds per step for DLL Flexible Prototype
8.589 milliseconds per step for DLL Flexible Prototype Numeric Limit
9.563 milliseconds per step for DLL Flexible Prototype Numeric Limit with Precondition
10.015 milliseconds per step for DLL Flexible Prototype Numeric Limit with Precondition and 4 Parameters
7.868 milliseconds per step for ActiveX Automation
8.892 milliseconds per step for LabVIEW Standard Prototype
With tracing and results disabled.
0.180 milliseconds per step for CVI Standard Prototype - Object File
0.182 milliseconds per step for CVI Standard Prototype - DLL
0.092 milliseconds per step for DLL Flexible Prototype
0.178 milliseconds per step for DLL Flexible Prototype Numeric Limit
0.277 milliseconds per step for DLL Flexible Prototype Numeric Limit with Precondition
0.400 milliseconds per step for DLL Flexible Prototype Numeric Limit with Precondition and 4 Parameters
0.270 milliseconds per step for ActiveX Automation
1.235 milliseconds per step for LabVIEW Standard Prototype

Estimate execution time for CTAS

Hi,
I am searching for long to find a way to estimate the execution time for CTAS commands. I am a DBA. Our users run CTAS commands to load millions of rows. The commands fetch data from 4-5 very big tables each with millions of records and process them using where clause and group by clause and finally create the table. All these things are coded in the CTAS command. These CTAS sometime takes long time like 5 , 8 Hrs. Users frequently ask me to find how long it's going to take. I use both OEM and TOAD. But I couldn't find the time estimated from these tools. I feel that there must be some way, but I don't know the method.
Can any body please help me in this regard?
Thanks & Regards
Ananda Basak

It depends on a number of factors chief among them how accurate your estimate needs to be but also including things like what version of Oracle you're using, how accurate your database statistics are, etc.
One option is to look at the TIME column in the plan. For example, if I wanted to do a CTAS to create a copy of the EMP table, the optimizer expects that to take on the order of a second. Of course, the optimizer's estimates are only estimates and are only as accurate as the database statistics that are in place. If the optimizer generates a bad plan, it's likely because the optimizer expects some operation to take much more or much less time than it does in reality in which case the optimizer's runtime estimate is likely to be way off.
SQL> explain plan for create table emp_copy as select * from emp;
Explained.
SQL> ed
Wrote file afiedt.buf
1 select *
2*   from table( dbms_xplan.display() )
SQL> /
PLAN_TABLE_OUTPUT
Plan hash value: 2748781111
| Id | Operation              | Name     | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | CREATE TABLE STATEMENT |          |    14 |   546 |     4   (0)| 00:00:01 |
|   1 | LOAD AS SELECT        | EMP_COPY |       |       |            |          |
|   2 |   TABLE ACCESS FULL    | EMP      |    14 |   546 |     3   (0)| 00:00:01 |
-----------------------------------------------------------------------------------Depending on the query plan, you may be able to query the GV$SESSION_LONGOPS table to track the progress of any long-running operations in your session. If your query plan involves a lot of full table scans, sorts that take more than a few seconds, hash joins, etc. then it is likely that you'll be able to chart the progress of a query over time by watching GV$SESSION_LONGOPS change. Of course, if your query is going to need to do many long-running operations, you'll need to a human to interpret the data a bit in order to figure out where in the plan Oracle currently is and how far along that means the entire query is.
SELECT *
FROM gv$session_longops
WHERE time_remaining > 0If you're using 11g and you have the performance and tuning pack licensed, you could also potentially use the V$SQL_PLAN_MONITOR view.
Justin

Ideal execution time for any program

Hi,
Is there any method to determine the ideal execution time for a program ?
Or else how to determine that ?
I just wanted the max. time that a program can take so that the performance would not be hampered.
Thanks,
Binay.

did you ask for the 'ideal execution time' or 'how to measure execution times'?
The second question was answered in one of your other questions.
Optimization:
Do SQL Trace, go to Summary by SQL statement, check 10 Top contributions (time = duration).
Try to optimize them, note minimal time per record, if larger than 10.000 microsecodns, then you should index usage.
Do SE30, go to hit list, sort by net time, again address 10 Top contributions, try to optimize, check the coding.
Do optimization and trace again, check again 10 Top contributions ....
Siegfried

How to get the time for executing an SQL statement?

hi all...
How can I get the total execution time for a given SQL statement to a ViewObject which is created dynamically for this SQL so that the end user knows it before hand and try to stop it or go further..?
Please post any ideas if you have got..!!!
thanx in advance..
grÃ¼ss
KÂ°vi

This is not really a question for the JDeveloper forum, but rather for the DB forum.
Since Oracle9i there is a way to estimate how long a query will take, before executing it.
Check it out in the Oracle DB documentation or ask on the DB forum.
There is no built-in functionality for this in JDeveloper, but you should be able to call out to the DB from your Java code to get the estimate.

How to extract execution time of a step

how to extract execution time of a step ?
This step calls another sequence, and
I want to know how long it take to execute that seqeuence.
I need this information during run time, not in the
report.
thanks.

Hi,
You could try.
Enable the Record Result for the step in question.
This will allow you to extract the TotalTime.
Then you could use the RemoveElements(Locals.ResultList,"[0]",1) - this assumes you have only logged one result. This is the same as not recording results for that step.
Otherwise you will have to workout the time yourself by calling the API Execution.SecondsExecuting() - API Execution.SecondsAtStart().
Regards
Ray Farmer
Regards
Ray Farmer

How to reduce download time for intial swf?

How to reduce download time for intial swf?
There are a number of RPC calls but most of the data is cached at server end but still swf takes a lot of time to download completely.
What all are the ways by which i can reuce the inital load time of my application?

Reduce the size of the SWF by moving code and assets not needed for the
first screen out into modules.

Execution time for Call Library Function Node

I am experimenting with the Call Library Function Node block in LabVIEW and am curious if it should be running faster than what I'm seeing. For testing purposes, I have compiled and transfered to my RT target the .out file from the KB article http://digital.ni.com/public.nsf/allkb/81D1172E3C28A5E4862575CC0076A230 (I'm using the vxworks 6.1 version). The function in the .out file just multiplies two inputs together, adds a constant, and returns the result. I have put this inside a 1 kHz timed loop with a commanded period of 1 ms and via the Ticks(ms) block and shift registers I calculate the amount of time per loop execution. This process is apparently taking 5 ms per cycle and to me that seems slow. Is that roughly the correct execution time for this kind of setup? I will attach my test .vi file.
What I'm using:
Windows 7
LabVIEW 2009 SP1
NI-cRIO 9024 with NI-RIO 3.4.0
Solved!
Go to Solution.
Attachments:
test DLL.vi ‏31 KB

First off, the way you are doing timing isn't necessarily accurate because you don't know when the tick count VI is being called. For example, if it gets called on one iteration after your call library node executes, and the next iteration it gets called before the CLFN it executes, the subtraction doesn't include the call of the CLFN so you aren't seeing the true time it is taking for the dll to be called.
Where it says "error" on the top left hand corner of your loop. left click and choose previous iteration timing. Also, do you have the ability to choose a 1 Mhz clock? Are you sure it's actually being run on the RT and not on your PC? Running it on the PC would definitely make it difficult to execute at a 1 kHz rate.
CLA, LabVIEW Versions 2010-2013

Query Execution Time for a Query causing ORA-1555

dear Gurus
I have ORA-01555 error , earlier I used the Query Duration mentioned in Alert Log and increased the Undo Retention as I did not find th UnDOBLKS column of v$undostat high for the time of occurence of ORA-01555..
But new ORA-01555 is coming whose query duration exceeds Undo Retention time..
My question -
1. Is it possible to accurately find the query duration time besides the Alert Log file ?

abhishek, as you are using an undo tablespace and have already increased the time that undo data is retained via undo_retention then you might want to consider the following ideas which were useful with 1555 error under manual rbs segment management.
1- Tune the query. The faster a query runs the less likely a 1555 will occur.
2- Look at the processing. If a process was reading and updating the same table while committing frequenctly then the process under manual rbs management would basically create its own 1555 error rather than just being the victum of another process changing data and the rbs data being overlaid while the long running query was still running. With undo management the process could be generating more data than can be held for the undo_retention period but because it is committed Oracle has been told it doesn't really have to keep the data for use rolling back a current transaction so it gets discarded to make room for new changes.
If you find item 2 is true then separating the select from the update will likely eliminate the 1555. You do this by building a driving table that has the keys of the rows to be updated or deleted. Then you use the driver to control accessing the target table.
3- If the cause of the 1555 is or may be delayed block cleanout then select * from the target prior to running the long running query.
Realistically you might need to increase the size of the undo tablespace to hold all the change data and the value of the undo_retention parameter to be longer than the job run time. Which brings up back to option 1. Tune every query in the process so that the job run time is reduced to optimal.
HTH -- Mark D Powell --
dear mark
Thanks for the excellent advise..I found that the error is coming because of frequent commits..which is item 2 as u righly mentioned ..
I think I need to keep a watch on the queries running , I was just trying to find the execution time for the queries..If there is any way to find the query duration without running a trace ..
regards
abhishek

How to optimize execution time for code

Similar Messages

Maybe you are looking for