Java statements execution time

How to measure the execution time of a java statement in a repeatable and consistent manner.
We are measuring time by executing the interesting Java code 200 000 000 times in a loop and measuring the execution time of the whole loop by calling System.currentTimeMillis() before and after. However, we observe that the time needed to execute the loop is not constant. It varies both if the same measurement code is executed several times in an outer loop and if code before the timer loop is modified. Because of these inconsistencies we find it difficult to measure the execution time.

You must also understand that there will be no consistent way to measure time from within the program itself, because things such as process swapping, memory cleanup, bottom halves, interrupts, and all sorts of kernel tasks (regardless of the kernel -win or linux), are happening at intervals based on a number of system timers. Because all of these are completely transparent to a java process, it will not be able to decide reliably how long it takes to execute a method.
Somebody suggested useing a java profiling tool such as JProbe. This is a good suggestion.
If you want a reasonable estimate, execute your method several thousand times, collect the run time data, and take the mean. You can even use statistical methods to come up with a confidence interval and standard deviation, if you are that interested :) Hope this helps,
-Joe

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Execution time difference between SELECT & UPDATE statement in JDBC Sender.

Hi Experts,
In my scenario, I have used the JDBC Sender Adapter with the SELECT and UPDATE statement.
Now the problem is in between the execution of Select and update statement, few more entries are coming in the same DB Table.
So result of this is updation take place for those entries which are not even picked up by the select statement.
Can we avoid this execution time difference between the SELECT & UPDATE statemet on JDBC Sender side???
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Hi
Use serializable option in additional parameters, now all new entries would also be updated.

Java program to calculate next execution time if one cron expression is giv

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[Did you check here?|http://www.lmgtfy.com/?q=java+cron+expression]

Long execution times for TestStand conditional statements

I have two test stations – one here, one at the factory in China that has been operating for about a year. The test program uses TestStand 3.1 and calls primarily dll's developed using CVI. Up until a couple months ago, both test stations performed in a similar manner, then the computer at the factory died and was replaced with a new, faster computer. Now the same test sequence at the factory take three times as long to execute (30 min at the facotry, 10min here).
I have recoded the execution time at various point during the execution, and have found that the extra times seems to be occurring during the evaluation of conditional statements in TestStand (i.e. for loops, if statements, case statements). For example, one particular ‘for’ evaluation takes 30 ms on the test station here, but takes 400 ms at the test station at the factory (note: this is just the evaluation of the for condition, not the execution of the steps contained within the for loop).
The actual dll calls seem to be slightly faster with the new computer.
Also the ‘Module Times’ reported don’t seem to match the actual time for the module for the computer at the factory. For example, for the following piece of TestStand code:
Label1
Subsequence Call
Label2
I record the execution time to the report text in both Label1 and Label2. Subtracting one from the other gives me about 18 seconds. However the ‘Module Time’ recorded for ‘Subsequence Call’ is only 3.43 seconds.
Any body have any ideas why the long execution time with the new computer? I always setup the computers in exactly the same way, but maybe there is a TestStand setting somewhere that I have missed? Keep in mind, both test stations are running exactly the same revision of code.

Got some more results from the factory this morning:
1) Task Manager shows that the TestExec.exe is the only thing using CPU to any significant degree. Also CPU Usage History show that the CPU Usage never reaches 100%.
2) I sent a new test program that will log test execution time in more places. Longer execution times are seen in nearly every area of the program, but one area where this is very dramatic is the time taken to return from one particular subsequence call. In this subsequence I log the time just before the <End Group> at then end of Main. There is nothing in Cleanup. I then log the time immediately after returning from this sequence. On the test system I have here this takes approximately 160 ms. On the test system at the factory this takes approximately 14.5 seconds! The program seems to be hanging here for some reason. Every time this function is called the same thing happens and for the same amount of time (and this function is called about 40 times in the test program, so this is kill me).

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");
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* Thanks

* Hi flounder, Is following code will wotk perfectly?
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          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");
     }

Can the format of a SQL Statement modify the execution time of an SQL ....

Can the format of a SQL Statement modify the execution time of an SQL statement?
Thanks in advance

It depends on:
1) What oracle version are you using
2) What do you mean for "format"
For example: if you're on Oracle9i and changing format means changing the order of the tables in the FROM clause and you're using Rule Based Optimizer then the execution plan and the execution time can be very different...
Max
[My Italian Oracle blog|http://oracleitalia.wordpress.com/2009/12/29/estrarre-i-dati-in-formato-xml-da-sql/]

Loading jar files at execution time via URLClassLoader

Hello�All,
I'm�making�a�Java�SQL�Client.�I�have�practicaly�all�basic�work�done,�now�I'm�trying�to�improve�it.
One�thing�I�want�it�to�do�is�to�allow�the�user�to�specify�new�drivers�and�to�use�them�to�make�new�connections.�To�do�this�I�have�this�class:�
public�class�DriverFinder�extends�URLClassLoader{
��private�JarFile�jarFile�=�null;
��
��private�Vector�drivers�=�new�Vector();
��
��public�DriverFinder(String�jarName)�throws�Exception{
��super(new�URL[]{�new�URL("jar",�"",�"file:"�+�new�File(jarName).getAbsolutePath()�+"!/")�},�ClassLoader.getSystemClassLoader());
��jarFile�=�new�JarFile(new�File(jarName));
��
��/*
��System.out.println("-->"�+�System.getProperty("java.class.path"));
��System.setProperty("java.class.path",�System.getProperty("java.class.path")+File.pathSeparator+jarName);
��System.out.println("-->"�+�System.getProperty("java.class.path"));
��*/
��
��Enumeration�enumeration�=�jarFile.entries();
��while(enumeration.hasMoreElements()){
��String�className�=�((ZipEntry)enumeration.nextElement()).getName();
��if(className.endsWith(".class")){
��className�=�className.substring(0,�className.length()-6);
��if(className.indexOf("Driver")!=-1)System.out.println(className);
��
��try{
��Class�classe�=�loadClass(className,�true);
��Class[]�interfaces�=�classe.getInterfaces();
��for(int�i=0;�i<interfaces.length;�i++){
��if(interfaces.getName().equals("java.sql.Driver")){
��drivers.add(classe);
��}
��}
��Class�superclasse�=�classe.getSuperclass();
��interfaces�=�superclasse.getInterfaces();
��for(int�i=0;�i<interfaces.length;�i++){
��if(interfaces[i].getName().equals("java.sql.Driver")){
��drivers.add(classe);
��}
��}
��}catch(NoClassDefFoundError�e){
��}catch(Exception�e){}
��}
��}
��}
��
��public�Enumeration�getDrivers(){
��return�drivers.elements();
��}
��
��public�String�getJarFileName(){
��return�jarFile.getName();
��}
��
��public�static�void�main(String[]�args)�throws�Exception{
��DriverFinder�df�=�new�DriverFinder("D:/Classes/db2java.zip");
��System.out.println("jar:�"�+�df.getJarFileName());
��Enumeration�enumeration�=�df.getDrivers();
��while(enumeration.hasMoreElements()){
��Class�classe�=�(Class)enumeration.nextElement();
��System.out.println(classe.getName());
��}
��}
It�loads�a�jar�and�searches�it�looking�for�drivers�(classes�implementing�directly�or�indirectly�interface�java.sql.Driver)�At�the�end�of�the�execution�I�have�found�all�drivers�in�the�jar�file.
The�main�application�loads�jar�files�from�an�XML�file�and�instantiates�one�DriverFinder�for�each�jar�file.�The�problem�is�at�execution�time,�it�finds�the�drivers�and�i�think�loads�it�by�issuing�this�statement�(Class�classe�=�loadClass(className,�true);),�but�what�i�think�is�not�what�is�happening...�the�execution�of�my�code�throws�this�exception
java.lang.ClassNotFoundException:�com.ibm.as400.access.AS400JDBCDriver
��at�java.net.URLClassLoader$1.run(URLClassLoader.java:198)
��at�java.security.AccessController.doPrivileged(Native�Method)
��at�java.net.URLClassLoader.findClass(URLClassLoader.java:186)
��at�java.lang.ClassLoader.loadClass(ClassLoader.java:299)
��at�sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:265)
��at�java.lang.ClassLoader.loadClass(ClassLoader.java:255)
��at�java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)
��at�java.lang.Class.forName0(Native�Method)
��at�java.lang.Class.forName(Class.java:140)
��at�com.marmots.database.DB.<init>(DB.java:44)
��at�com.marmots.dbreplicator.DBReplicatorConfigHelper.carregaConfiguracio(DBReplicatorConfigHelper.java:296)
��at�com.marmots.dbreplicator.DBReplicatorConfigHelper.<init>(DBReplicatorConfigHelper.java:74)
��at�com.marmots.dbreplicator.DBReplicatorAdmin.<init>(DBReplicatorAdmin.java:115)
��at�com.marmots.dbreplicator.DBReplicatorAdmin.main(DBReplicatorAdmin.java:93)
Driver�file�is�not�in�the�classpath�!!!�
I�have�tried�also�(as�you�can�see�in�comented�lines)�to�update�System�property�java.class.path�by�adding�the�path�to�the�jar�but�neither...
I'm�sure�I'm�making�a/some�mistake/s...�can�you�help�me?
Thanks�in�advice,
(if�there�is�some�incorrect�word�or�expression�excuse�me)

Sorry i have tried to format the code, but it has changed to �... sorry read this one...
Hello All,
I'm making a Java SQL Client. I have practicaly all basic work done, now I'm trying to improve it.
One thing I want it to do is to allow the user to specify new drivers and to use them to make new connections. To do this I have this class:
public class DriverFinder extends URLClassLoader{
private JarFile jarFile = null;
private Vector drivers = new Vector();
public DriverFinder(String jarName) throws Exception{
super(new URL[]{ new URL("jar", "", "file:" + new File(jarName).getAbsolutePath() +"!/") }, ClassLoader.getSystemClassLoader());
jarFile = new JarFile(new File(jarName));
System.out.println("-->" + System.getProperty("java.class.path"));
System.setProperty("java.class.path", System.getProperty("java.class.path")+File.pathSeparator+jarName);
System.out.println("-->" + System.getProperty("java.class.path"));
Enumeration enumeration = jarFile.entries();
while(enumeration.hasMoreElements()){
String className = ((ZipEntry)enumeration.nextElement()).getName();
if(className.endsWith(".class")){
className = className.substring(0, className.length()-6);
if(className.indexOf("Driver")!=-1)System.out.println(className);
try{
Class classe = loadClass(className, true);
Class[] interfaces = classe.getInterfaces();
for(int i=0; i<interfaces.length; i++){
if(interfaces.getName().equals("java.sql.Driver")){
drivers.add(classe);
Class superclasse = classe.getSuperclass();
interfaces = superclasse.getInterfaces();
for(int i=0; i<interfaces.length; i++){
if(interfaces[i].getName().equals("java.sql.Driver")){
drivers.add(classe);
}catch(NoClassDefFoundError e){
}catch(Exception e){}
public Enumeration getDrivers(){
return drivers.elements();
public String getJarFileName(){
return jarFile.getName();
public static void main(String[] args) throws Exception{
DriverFinder df = new DriverFinder("D:/Classes/db2java.zip");
System.out.println("jar: " + df.getJarFileName());
Enumeration enumeration = df.getDrivers();
while(enumeration.hasMoreElements()){
Class classe = (Class)enumeration.nextElement();
System.out.println(classe.getName());
It loads a jar and searches it looking for drivers (classes implementing directly or indirectly interface java.sql.Driver) At the end of the execution I have found all drivers in the jar file.
The main application loads jar files from an XML file and instantiates one DriverFinder for each jar file. The problem is at execution time, it finds the drivers and i think loads it by issuing this statement (Class classe = loadClass(className, true);), but what i think is not what is happening... the execution of my code throws this exception
java.lang.ClassNotFoundException: com.ibm.as400.access.AS400JDBCDriver
at java.net.URLClassLoader$1.run(URLClassLoader.java:198)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:186)
at java.lang.ClassLoader.loadClass(ClassLoader.java:299)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:265)
at java.lang.ClassLoader.loadClass(ClassLoader.java:255)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:140)
at com.marmots.database.DB.<init>(DB.java:44)
at com.marmots.dbreplicator.DBReplicatorConfigHelper.carregaConfiguracio(DBReplicatorConfigHelper.java:296)
at com.marmots.dbreplicator.DBReplicatorConfigHelper.<init>(DBReplicatorConfigHelper.java:74)
at com.marmots.dbreplicator.DBReplicatorAdmin.<init>(DBReplicatorAdmin.java:115)
at com.marmots.dbreplicator.DBReplicatorAdmin.main(DBReplicatorAdmin.java:93)
Driver file is not in the classpath !!!
I have tried also (as you can see in comented lines) to update System property java.class.path by adding the path to the jar but neither...
I'm sure I'm making a/some mistake/s... can you help me?
Thanks in advice,
(if there is some incorrect word or expression excuse me)

Slow query execution time

Hi,
I have a query which fetches around 100 records from a table which has approximately 30 million records. Unfortunately, I have to use the same table and can't go ahead with a new table.
The query executes within a second from RapidSQL. The problem I'm facing is it takes more than 10 minutes when I run it through the Java application. It doesn't throw any exceptions, it executes properly.
The query:
SELECT aaa, bbb, SUM(ccc), SUM(ddd), etc
FROM MyTable
WHERE SomeDate= date_entered_by_user AND SomeString IN ("aaa","bbb")
GROUP BY aaa,bbbI have an existing clustered index on SomeDate and SomeString fields.
To check I replaced the where clause with
WHERE SomeDate= date_entered_by_user AND SomeString = "aaa"No improvements.
What could be the problem?
Thank you,
Lobo

It's hard for me to see how a stored proc will address this problem. I don't think it changes anything. Can you explain? The problem is slow query execution time. One way to speed up the execution time inside the RDBMS is to streamline the internal operations inside the interpreter.
When the engine receives a command to execute a SQL statement, it does a few things before actually executing the statement. These things take time. First, it checks to make sure there are no syntax errors in the SQL statement. Second, it checks to make sure all of the tables, columns and relationships "are in order." Third, it formulates an execution plan. This last step takes the most time out of the three. But, they all take time. The speed of these processes may vary from product to product.
When you create a stored procedure in a RDBMS, the processes above occur when you create the procedure. Most importantly, once an execution plan is created it is stored and reused whenever the stored procedure is ran. So, whenever an application calls the stored procedure, the execution plan has already been created. The engine does not have to anaylze the SELECT|INSERT|UPDATE|DELETE statements and create the plan (over and over again).
The stored execution plan will enable the engine to execute the query faster.
/>

Execution time for an insert/update

Hello!
We are using EJB entities 3.0 and JPA configured to run on WAS and DB2. We also are using Container Managed Persistence
We have a transactional method let's name it addA(), when executed, ultimately inserts data in 11 DB2 tables.
In some of the 11 tables there are could be multiple rows inserted, in average, about 2 inserts.
We are using the EntityManager.persist method to handle each entity.
The method completes in about 11 seconds when the resources on the server (CPU,memory) are in a good state (so not overloaded).
Is this a reasonable/decent time for the operation we are trying to do?
If not, what would be a reasonable running time for such an operation?
What do we need to do in order to improve the performance and decrease the execution time, other than switching to BMP and coding manual SQL inserts?

user2617486 wrote:
Do you have any idea how we can localize/isolate better the problem at the DB level?
Can we programatically insert log statements to see how long it takes the processing on the WAS and how long takes the actual SQL statements execution once they hit the DB2 database?You need help from a DBA, you can't reason this problem away. You need cold hard facts from whatever tooling the database provides. Of course you could try adding log statements to see how long each database operation is taking on the Java side of things, but that only proves that it is slow, not WHY it is slow.
The network latency can not be considered in this case since we run the test application on the same WAS where the application resides so it no networking involved.and the database runs on that machine as well? This is new information you are pulling out of your hat by the way, now all of a sudden there are two applications? And with the limited information you give I am to assume you are having performance problems from the test application and not from your "main application"? Otherwise I see no point in you making this argument.

Clustering of SQL query execution times

In doing some query execution experiments I have noted a curious (to me, anyhow) clustering of execution times around two distinct points. Across about 100 tests each running 1000 queries using (pseudo-)randomly generated IDs the following pattern emerges. The queries were run from Java using all combinations of pooled/non-pooled and thin/oci driver combinations:
     100          *
     90          *
R     80          *
u     70          *
n     60          *
s     50          *
     40          *                                             *
     30          *                                             *
     20          *                                        *     *     *
     10          *     *                              *     *     *     *
          0     100     200     300     400     500     600     700     800     900     1000     1100     1200
                                   Time(ms)Where about half of the total execution times cluster strongly about a given (short) time value with a smaller but broader clustering at a significantly slower mark, with zero intermediate values. The last point is the one I find most curious.
What I would have expected is something like this:
     100
     90
R     80
u     70
n     60
s     50
     40                              *
     30                         *     *     *
     20                    *     *     *     *     *     *
     10          *     *     *     *     *     *     *     *     *     *
          0     100     200     300     400     500     600     700     800     900     1000     1100     1200
                                   Time(ms)The variables I have tentatively discounted thus far:
-query differences (single query used)
-connection differences (using single pooled connection)
-garbage collection (collection spikes independent of query execution times)
-amount of data returned in bytes (single varchar2 returned and size is independent of execution time)
-driver differences (thin and oci compared, overall times differ but pattern of clustering remains)
-differences between Statement and PreparedStatement usage (both show same pattern)
I know this is a rather open-ended question, but does the described pattern seem faniliar or spark any thoughts?
DB-side file I/O?
Thread time-slicing variations (client or DB-side)?
FWIW, the DB is 9.2.0.3 DB and the clients are running on WinXP with Java 5.0 and 9i drivers.
Thanks and regards,
M

Further context:
Are your queries only SELECT queries ?
Yes, the same SELECT query is used for all tests. The only variable is the bind variable used to identify the primary key of the selection set (i.e. SELECT a.* from a, b, c where a.x = b.x and b.y = c.y and c.pk = ?) where all PKs and FKs are indexed.Do the queries always use the same tables, the same where clauses ?
Yes, the same tables are always invoked. The where clauses invoked are identical with the excepton of the single bind variable as described above.Do your queries always use bind variables ?
A single bind variable is used in all invocations as described above.Are your queries also running in single user mode or multi user mode (do you use SELECT FOR UPDATE ?) ?
We are not using SELECT FOR UPDATEDid something else run on the database/on the server hosting the database on the same time ?
I have not eliminated the idea, but the test has been repeated roughly 100 times over the course of a week and at different times of day with the same pattern emerging. I suppose it is not out of the question that a resource-hogging process is running consistently and constantly on the DB-side box.Thanks for the input,
M

Unequal execution time

Hi,
I used 100 account numbers to connect to db2/400 using prepared statement.After looking at the execution times,
it looks to me sometake 313ms and sometake 0ms.This pattern is alternate as you look at the output.
can somebody explain why it is happening like this?
Thanks
Chat
time taken for execution is 313 ms
time taken for execution is 31 ms
time taken for execution is 0 ms
time taken for execution is 16 ms
time taken for execution is 0 ms
time taken for execution is 15 ms
time taken for execution is 0 ms
time taken for execution is 16 ms
time taken for execution is 0 ms

The first two times are long because the Hotspot compiler hasn't finished compiling everything. Could also be that the database creates an execution plan for the prepared statement the first time you execute it.
You sometimes get 0 and sometimes 15 because the clock in your computer ticks every 15 or 16 milliseconds. When you look at the time, then do something, then look at the time again sometimes the clock hasn't ticked, sometimes it has.
To measure something execute it several times in a loop to get around clock tick resolution. Repeat the measurement loop a few times so you don't be measuring Hotspot compilation. I use boilerplate code like this to do microbenchmarking:
    public static void main(String args[])
        System.out.println("Ignore the first few timings.");
        System.out.println("They may include Hotspot compilation time.");
        System.out.println("I hope you are running me with \"java -server\"!");
     for (int n = 0; n < 5; n++)
         doit();
    static void doit()
     long start = System.currentTimeMillis();
     for (int n = 0; n < 1000; n++) {
            // Your code here.
            // Adjust the loop count so that the whole loop takes a second or two.
     long end = System.currentTimeMillis();
     System.out.println("time " + (end - start));
    }

How to find out the execution time of a sql inside a function

Hi All,
I am writing one function. There is only one IN parameter. In that parameter, i will pass one SQL select statement. And I want the function to return the exact execution time of that SQL statement.
CREATE OR REPLACE FUNCTION function_name (p_sql IN VARCHAR2)
RETURN NUMBER
IS
exec_time NUMBER;
BEGIN
--Calculate the execution time for the incoming sql statement.
RETURN exec_time;
END function_name;
/

Please note that wrapping query in a "SELECT COUNT(*) FROM (<query>)" doesn't necessarily reflect the execution time of the stand-alone query because the optimizer is smart and might choose a completely different execution plan for that query.
A simple test case shows the potential difference of work performed by the database:
Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production
Session altered.
SQL>
SQL> drop table count_test purge;
Table dropped.
Elapsed: 00:00:00.17
SQL>
SQL> create table count_test as select * from all_objects;
Table created.
Elapsed: 00:00:02.56
SQL>
SQL> alter table count_test add constraint pk_count_test primary key (object_id)
Table altered.
Elapsed: 00:00:00.04
SQL>
SQL> exec dbms_stats.gather_table_stats(ownname=>null, tabname=>'COUNT_TEST')
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.29
SQL>
SQL> set autotrace traceonly
SQL>
SQL> select * from count_test;
5326 rows selected.
Elapsed: 00:00:00.10
Execution Plan
Plan hash value: 3690877688
| Id | Operation         | Name       | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT |            | 5326 |   431K|    23   (5)| 00:00:01 |
|   1 | TABLE ACCESS FULL| COUNT_TEST | 5326 |   431K|    23   (5)| 00:00:01 |
Statistics
          1 recursive calls
          0 db block gets
        419 consistent gets
          0 physical reads
          0 redo size
     242637 bytes sent via SQL*Net to client
       4285 bytes received via SQL*Net from client
        357 SQL*Net roundtrips to/from client
          0 sorts (memory)
          0 sorts (disk)
       5326 rows processed
SQL>
SQL> select count(*) from (select * from count_test);
Elapsed: 00:00:00.00
Execution Plan
Plan hash value: 572193338
| Id | Operation             | Name          | Rows | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT      |               |     1 |     5   (0)| 00:00:01 |
|   1 | SORT AGGREGATE       |               |     1 |            |          |
|   2 |   INDEX FAST FULL SCAN| PK_COUNT_TEST | 5326 |     5   (0)| 00:00:01 |
Statistics
          1 recursive calls
          0 db block gets
         16 consistent gets
          0 physical reads
          0 redo size
        412 bytes sent via SQL*Net to client
        380 bytes received via SQL*Net from client
          2 SQL*Net roundtrips to/from client
          0 sorts (memory)
          0 sorts (disk)
          1 rows processed
SQL>As you can see the number of blocks processed (consistent gets) is quite different. You need to actually fetch all records, e.g. using a PL/SQL block on the server to find out how long it takes to process the query, but that's not that easy if you want to have an arbitrary query string as input.
Regards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle:
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/

Need to know how to find the last execution time for a function module

HI all
I need to know
1) How to find out the last execution time of the function module ?
say for eg. I have executed a func. module at 1:39pm. How to retrieve this time (1:39pm)
2) I have created 3 billing document in tcode VF01 i.e 3 billing doucment no. would be created in SAP TABLE "VBRP" b/w 12am to 12:30 am.
How to capture the latest SAP database update b/w time intervals?
3) Suppose I am downloading TXT file using "GUI_DOWNLOAD" and say in 20th record some error has happened. I can capture the error using the exception.
Is it possible to run the program once again from 21st records ? All this will be running in background...
Kindly clarify....
Points will be rewarded
Thanks in advance

1.Use tcode STAT input as Tcode of Fm and execute .
2. See the billing documents are created in table VBRk header and there will always be Creation date and time.
VBRk-Erdat "date ., u can check the time field also
So now if u talk the date and time we can filter then display the records in intervals.
3. with an error exeption how is my txt download finished .
once exception is raised there will not be a download .
regards,
vijay

How to reduce execution time ?

Hi friends...
I have created a report to display vendor opening balances,
total debit ,total credit , total balance & closing balance for the given date range. it is working fine .But it takes more time to execute . How can I reduce execution time ?
Plz help me. It's a very urgent report...
The coding is as below.....
report yfiin_rep_vendordetail no standard page heading.
tables : bsik,bsak,lfb1,lfa1.
type-pools : slis .
--TABLE STRUCTURE--
types : begin of tt_bsik,
        bukrs type bukrs,
        lifnr type lifnr,
        budat type budat,
        augdt type augdt,
        dmbtr type dmbtr,
        wrbtr type wrbtr,
        shkzg type shkzg,
        hkont type hkont,
        bstat type bstat_d ,
        prctr type prctr,
        name1 type name1,
     end of tt_bsik,
     begin of tt_lfb1,
         lifnr type lifnr,
         mindk type mindk,
     end of tt_lfb1,
    begin of tt_lfa1,
        lifnr type lifnr,
        name1 type name1,
        ktokk type ktokk,
    end of tt_lfa1,
    begin of tt_opbal,
        bukrs type bukrs,
        lifnr type lifnr,
        gjahr type gjahr,
        belnr type belnr_d,
        budat type budat,
        bldat type bldat,
        waers type waers,
        dmbtr type dmbtr,
        wrbtr type wrbtr,
        shkzg type shkzg,
        blart type blart,
        monat type monat,
        hkont type hkont,
        bstat type bstat_d ,
        prctr type prctr,
        name1 type name1,
        tdr type dmbtr,
        tcr type dmbtr,
        tbal type dmbtr,
      end of tt_opbal,
     begin of tt_bs ,
        bukrs type bukrs,
        lifnr type lifnr,
        name1 type name1,
        prctr type prctr,
        tbal type dmbtr,
        bala type dmbtr,
        balb type dmbtr,
        balc type dmbtr,
        bald type dmbtr,
        bale type dmbtr,
        gbal type dmbtr,
    end of tt_bs.
************WORK AREA DECLARATION *********************
data : gs_bsik type tt_bsik,
        gs_bsak type tt_bsik,
        gs_lfb1 type tt_lfb1,
        gs_lfa1 type tt_lfa1,
        gs_ageing type tt_ageing,
        gs_bs type tt_bs,
        gs_opdisp type tt_bs,
        gs_final type tt_bsik,
        gs_opbal type tt_opbal,
        gs_opfinal type tt_opbal.
************INTERNAL TABLE DECLARATION*************
data : gt_bsik type standard table of tt_bsik,
        gt_bsak type standard table of tt_bsik,
        gt_lfb1 type standard table of tt_lfb1,
        gt_lfa1 type standard table of tt_lfa1,
        gt_ageing type standard table of tt_ageing,
        gt_bs type standard table of tt_bs,
        gt_opdisp type standard table of tt_bs,
        gt_final type standard table of tt_bsik,
        gt_opbal type standard table of tt_opbal,
        gt_opfinal type standard table of tt_opbal.
ALV DECLARATIONS *******************
data : gs_fcat type slis_fieldcat_alv ,
       gt_fcat type slis_t_fieldcat_alv ,
       gs_sort type slis_sortinfo_alv,
       gs_fcats type slis_fieldcat_alv ,
       gt_fcats type slis_t_fieldcat_alv.
**********global data declration***************
data :   kb type dmbtr ,
          return like bapireturn ,
          balancespgli like bapi3008-bal_sglind,
          noteditems like bapi3008-ntditms_rq,
          keybalance type table of bapi3008_3 with header line,
         opbalance type p.
SELECTION SCREEN DECLARATIONS *********************
selection-screen begin of block b1 with frame .
select-options : so_bukrs for bsik-bukrs obligatory,
                 so_lifnr for bsik-lifnr,
                 so_hkont for bsik-hkont,
                 so_prctr for bsik-prctr ,
                 so_mindk for lfb1-mindk,
                 so_ktokk for lfa1-ktokk.
selection-screen end of block b1.
selection-screen : begin of block b1 with frame.
parameters       : p_rb1 radiobutton group rad1 .
select-options   : so_date for sy-datum .
selection-screen : end of block b1.
********************************ASSIGNING ALV GRID
****field catalog for balance report
gs_fcats-col_pos = 1.
gs_fcats-fieldname = 'BUKRS'.
gs_fcats-seltext_m = text-001.
append gs_fcats to gt_fcats .
gs_fcats-col_pos = 2 .
gs_fcats-fieldname = 'LIFNR'.
gs_fcats-seltext_m = text-002.
append gs_fcats to gt_fcats .
gs_fcats-col_pos = 3.
gs_fcats-fieldname = 'NAME1'.
gs_fcats-seltext_m = text-003.
append gs_fcats to gt_fcats .
gs_fcats-col_pos = 4.
gs_fcats-fieldname = 'BALC'.
gs_fcats-seltext_m = text-016.
append gs_fcats to gt_fcats .
gs_fcats-col_pos = 5.
gs_fcats-fieldname = 'BALA'.
gs_fcats-seltext_m = text-012.
append gs_fcats to gt_fcats .
gs_fcats-col_pos = 6.
gs_fcats-fieldname = 'BALB'.
gs_fcats-seltext_m = text-013.
append gs_fcats to gt_fcats .
gs_fcats-col_pos = 7.
gs_fcats-fieldname = 'TBAL'.
gs_fcats-seltext_m = text-014.
append gs_fcats to gt_fcats .
gs_fcats-col_pos = 8.
gs_fcats-fieldname = 'GBAL'.
gs_fcats-seltext_m = text-015.
append gs_fcats to gt_fcats .
data : repid1 type sy-repid.
repid1 = sy-repid.
INITIALIZATION EVENTS ******************************
initialization.
*Clearing the work area.
clear gs_bsik.
Refreshing the internal tables.
refresh gt_bsik.
******************START OF SELECTION EVENTS **************************
start-of-selection.
*get data for balance report.
perform sub_openbal.
perform sub_openbal_display.
*&      Form sub_openbal
      text
--> p1        text
<-- p2        text
form sub_openbal .
if   so_date-low > sy-datum or so_date-high > sy-datum .
      message i005(yfi02).
     leave screen.
endif.
     select bukrs lifnr gjahr belnr budat bldat
       waers dmbtr wrbtr shkzg blart monat hkont prctr
       from bsik into table gt_opbal
       where bukrs in so_bukrs and lifnr in so_lifnr
       and hkont in so_hkont and prctr in so_prctr
       and budat in so_date .
    select bukrs lifnr gjahr belnr budat bldat
       waers dmbtr wrbtr shkzg blart monat hkont prctr
       from bsak appending table gt_opbal
       for all entries in gt_opbal
       where lifnr = gt_opbal-lifnr
       and budat in so_date .
if sy-subrc <> 0.
message i007(yfi02).
leave screen.
endif.
select lifnr mindk from lfb1 into table gt_lfb1
for all entries in gt_opbal
    where lifnr = gt_opbal-lifnr and mindk in so_mindk.
select lifnr name1 ktokk from lfa1 into table gt_lfa1
for all entries in gt_opbal
   where lifnr = gt_opbal-lifnr and ktokk in so_ktokk.
   loop at gt_opbal into gs_opbal .
     loop at gt_lfb1 into gs_lfb1 where lifnr = gs_opbal-lifnr.
       loop at gt_lfa1 into gs_lfa1 where lifnr = gs_opbal-lifnr.
        gs_opfinal-bukrs = gs_opbal-bukrs.
        gs_opfinal-lifnr = gs_opbal-lifnr.
        gs_opfinal-gjahr = gs_opbal-gjahr.
        gs_opfinal-belnr = gs_opbal-belnr.
        gs_opfinal-budat = gs_opbal-budat.
        gs_opfinal-bldat = gs_opbal-bldat.
        gs_opfinal-waers = gs_opbal-waers.
        gs_opfinal-dmbtr = gs_opbal-dmbtr.
        gs_opfinal-wrbtr = gs_opbal-wrbtr.
        gs_opfinal-shkzg = gs_opbal-shkzg.
        gs_opfinal-blart = gs_opbal-blart.
        gs_opfinal-monat = gs_opbal-monat.
        gs_opfinal-hkont = gs_opbal-hkont.
        gs_opfinal-prctr = gs_opbal-prctr.
        gs_opfinal-name1 = gs_lfa1-name1.
    if gs_opbal-shkzg    = 'H'.
        gs_opfinal-tcr   = gs_opbal-dmbtr * -1.
        gs_opfinal-tdr   = '000000'.
    else.
        gs_opfinal-tdr   = gs_opbal-dmbtr.
        gs_opfinal-tcr   = '000000'.
    endif.
       append gs_opfinal to gt_opfinal.
       endloop.
       endloop.
       endloop.
sort gt_opfinal by bukrs lifnr prctr .
so_date-low = so_date-low - 1 .
loop at gt_opfinal into gs_opfinal.
call function 'BAPI_AP_ACC_GETKEYDATEBALANCE'
exporting
    companycode        = gs_opfinal-bukrs
    vendor             = gs_opfinal-lifnr
    keydate            = so_date-low
   balancespgli        = ' '
   noteditems          = ' '
importing
    return             = return
tables
    keybalance         = keybalance.
clear kb .
loop at keybalance .
   kb = keybalance-lc_bal + kb .
endloop.
      gs_opdisp-balc = kb.
      gs_opdisp-bukrs = gs_opfinal-bukrs.
      gs_opdisp-lifnr = gs_opfinal-lifnr.
      gs_opdisp-name1 = gs_opfinal-name1.
    at new lifnr .
      sum .
      gs_opfinal-tbal = gs_opfinal-tdr + gs_opfinal-tcr .
      gs_opdisp-tbal = gs_opfinal-tbal.
      gs_opdisp-bala = gs_opfinal-tdr .
      gs_opdisp-balb = gs_opfinal-tcr .
      gs_opdisp-gbal = keybalance-lc_bal + gs_opfinal-tbal .
      append gs_opdisp to gt_opdisp.
    endat.
    clear gs_opdisp.
    clear keybalance .
endloop.
delete adjacent duplicates from gt_opdisp.
endform.                    " sub_openbal
*&      Form sub_openbal_display
      text
--> p1        text
<-- p2        text
form sub_openbal_display .
call function 'REUSE_ALV_GRID_DISPLAY'
    exporting
I_INTERFACE_CHECK                 = ' '
I_BYPASSING_BUFFER                = ' '
I_BUFFER_ACTIVE                   = ' '
      i_callback_program              = repid1
I_CALLBACK_PF_STATUS_SET          = ' '
I_CALLBACK_USER_COMMAND           = ' '
I_CALLBACK_TOP_OF_PAGE            = ' '
I_CALLBACK_HTML_TOP_OF_PAGE       = ' '
I_CALLBACK_HTML_END_OF_LIST       = ' '
I_STRUCTURE_NAME                  =
I_BACKGROUND_ID                   = ' '
I_GRID_TITLE                      =
I_GRID_SETTINGS                   =
IS_LAYOUT                         =
      it_fieldcat                     = gt_fcats
IT_EXCLUDING                      =
IT_SPECIAL_GROUPS                 =
IT_SORT                           =
IT_FILTER                         =
IS_SEL_HIDE                       =
I_DEFAULT                         = 'X'
I_SAVE                            = 'X'
IS_VARIANT                        =
   it_events                        =
IT_EVENT_EXIT                     =
IS_PRINT                          =
IS_REPREP_ID                      =
I_SCREEN_START_COLUMN             = 0
I_SCREEN_START_LINE               = 0
I_SCREEN_END_COLUMN               = 0
I_SCREEN_END_LINE                 = 0
IT_ALV_GRAPHICS                   =
IT_HYPERLINK                      =
IT_ADD_FIELDCAT                   =
IT_EXCEPT_QINFO                   =
I_HTML_HEIGHT_TOP                 =
I_HTML_HEIGHT_END                 =
IMPORTING
E_EXIT_CAUSED_BY_CALLER           =
ES_EXIT_CAUSED_BY_USER            =
     tables
       t_outtab                       = gt_opdisp
exceptions
    program_error                     = 1
    others                            = 2
if sy-subrc <> 0.
    message id sy-msgid type sy-msgty number sy-msgno
            with sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
endif.
endform.                    " sub_openbal_display

I think you are using for all entries statement in almost all select statements but i didnt see any condtion before you are using for all entries statement.
If you are using for all entries in gt_opbal ... make sure that gt_opbal has some records other wise it will try to read all records from the data base tables.
Try to check before using for all entries in the select statement like
if gt_opbal is not initial.
select adfda adfadf afdadf into table
for all entries in gt_opbal.
else.
select abdf afad into table
from abcd
where a = 1
    and b = 2.
endif.
i didnt see anything wrong in your report but this is major time consuming when you dont have records in the table which you are using for all entries.

Same sqlID with different execution plan and Elapsed Time (s), Executions time

Hello All,
The AWR reports for two days with same sqlID with different execution plan and Elapsed Time (s), Executions time please help me to find out what is reason for this change.
Please find the below detail 17th day my process are very slow as compare to 18th
17th Oct 18th Oct
221,808,602
21
2tc2d3u52rppt
213,170,100
72,495,618
9c8wqzz7kyf37
209,239,059
71,477,888
9c8wqzz7kyf37
139,331,777
1
7b0kzmf0pfpzn
144,813,295
1
0cqc3bxxd1yqy
102,045,818
1
8vp1ap3af0ma5
128,892,787
16,673,829
84cqfur5na6fg
89,485,065
1
5kk8nd3uzkw13
127,467,250
16,642,939
1uz87xssm312g
67,520,695
8,058,820
a9n705a9gfb71
104,490,582
12,443,376
a9n705a9gfb71
62,627,205
1
ctwjy8cs6vng2
101,677,382
15,147,771
3p8q3q0scmr2k
57,965,892
268,353
akp7vwtyfmuas
98,000,414
1
0ybdwg85v9v6m
57,519,802
53
1kn9bv63xvjtc
87,293,909
1
5kk8nd3uzkw13
52,690,398
0
9btkg0axsk114
77,786,274
74
1kn9bv63xvjtc
34,767,882
1,003
bdgma0tn8ajz9
Not only queries are different but also the number of blocks read by top 10 queries are much higher on 17th than 18th.
The other big difference is the average read time on two days
Tablespace IO Stats
17th Oct
Tablespace
Reads
Av Reads/s
Av Rd(ms)
Av Blks/Rd
Writes
Av Writes/s
Buffer Waits
Av Buf Wt(ms)
INDUS_TRN_DATA01
947,766
59
4.24
4.86
185,084
11
2,887
6.42
UNDOTBS2
517,609
32
4.27
1.00
112,070
7
108
11.85
INDUS_MST_DATA01
288,994
18
8.63
8.38
52,541
3
23,490
7.45
INDUS_TRN_INDX01
223,581
14
11.50
2.03
59,882
4
533
4.26
TEMP
198,936
12
2.77
17.88
11,179
1
732
2.13
INDUS_LOG_DATA01
45,838
3
4.81
14.36
348
0
1
0.00
INDUS_TMP_DATA01
44,020
3
4.41
16.55
244
0
1,587
4.79
SYSAUX
19,373
1
19.81
1.05
14,489
1
0
0.00
INDUS_LOG_INDX01
17,559
1
4.75
1.96
2,837
0
2
0.00
SYSTEM
7,881
0
12.15
1.04
1,361
0
109
7.71
INDUS_TMP_INDX01
1,873
0
11.48
13.62
231
0
0
0.00
INDUS_MST_INDX01
256
0
13.09
1.04
194
0
2
10.00
UNDOTBS1
70
0
1.86
1.00
60
0
0
0.00
STG_DATA01
63
0
1.27
1.00
60
0
0
0.00
USERS
63
0
0.32
1.00
60
0
0
0.00
INDUS_LOB_DATA01
62
0
0.32
1.00
60
0
0
0.00
TS_AUDIT
62
0
0.48
1.00
60
0
0
0.00
18th Oct
Tablespace
Reads
Av Reads/s
Av Rd(ms)
Av Blks/Rd
Writes
Av Writes/s
Buffer Waits
Av Buf Wt(ms)
INDUS_TRN_DATA01
980,283
91
1.40
4.74

The AWR reports for two days with same sqlID with different execution plan and Elapsed Time (s), Executions time please help me to find out what is reason for this change.
Please find the below detail 17th day my process are very slow as compare to 18th
You wrote with different execution plan, I think, you saw plans. It is very difficult, you get old plan.
I think Execution plans is not changed in different days, if you not added index or ...
What say ADDM report about this script?
As you know, It is normally, different Elapsed Time for same statement in different day.
It is depend your database workload.
It think you must use SQL Access and SQl Tuning advisor for this script.
You can get solution for slow running problem.
Regards
Mahir M. Quluzade

Java statements execution time

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