Application hangs on strange SQL

Hi,
during application slowdown I've noticed many following queries:
SELECT /*+ PIV_SSF */ SYS_OP_MSR(COUNT(*))
FROM (SELECT /*+ NO_EXPAND ROWID(A2) */ 0 FROM FOLLOWUP PX_GRANULE(0, BLOCK_RANGE, DYNAMIC) A2
WHERE
A2.COLLECTORCODE=:B1 AND A2.ZSTATEQUEUE=:B2 AND A2.SZQUEUECODE<>'EXC' AND A2.ZQUEUECODE<>'EXQ') A1 Judging by hints it looks like dynamic sampling is taking place (just guessing here), can You confirm that ?
I've got dynamic sampling level = 1 and this is EE 9.2.0.8 .
The strange part is that table got statistics .
Regards.
Greg

user10388717 wrote:
Hi,
during application slowdown I've noticed many following queries:
SELECT /*+ PIV_SSF */ SYS_OP_MSR(COUNT(*))
FROM (SELECT /*+ NO_EXPAND ROWID(A2) */ 0 FROM FOLLOWUP PX_GRANULE(0, BLOCK_RANGE, DYNAMIC) A2
WHERE
A2.COLLECTORCODE=:B1 AND A2.ZSTATEQUEUE=:B2 AND A2.SZQUEUECODE<>'EXC' AND A2.ZQUEUECODE<>'EXQ') A1 Judging by hints it looks like dynamic sampling is taking place (just guessing here), can You confirm that ?
I've got dynamic sampling level = 1 and this is EE 9.2.0.8 .
The strange part is that table got statistics .
Regards.
GregAre the queries actually contributing to the performance slowdown in some measurable way? This looks like internal oracle code associated with parallel query and it could be the use of parallel query itself which is slowing the system, not this query in particular.

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This code is written on custom controller. We are using the SAPSR3DB datasource. Do anybody have any idea why this is happening . Thanks in advance
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finally {
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Hello,
There can be any issue, i dont see any compile time issue with your code, but you may wana do a simplistic query first.
First of all, the statement and conection close, do it in the finally block, untill unless you are reusing it.
other than this.
First, after connection, see if you are getting the connection or not.
conn = dataSource.getConnection();
//print the connection and check if the connection is fine.
comment remaining stuff in the loop.
In the second shot, run a simple query like select count(*) from TABLE ;
to see if the connection and execution is fine. this will make sure
Also, before you set the values into the statement using setString, print the values to check for correctness and not null.
btw, i found an extra ")" in your setString(12,.....) ;
stmt.setString(12, wdContext.currentContextElement().getHuIndicator));
What are you trying to close in your finally block when you have already closed the connection in the try.
try{
          stmt.close();
          conn.close();
     } catch (SQLException ex) {
          msgMgr.reportException(
               ex.getLocalizedMessage() + ";SQL State - " + ex.getSQLState(),
               true);
     } catch (Exception ex) {
          msgMgr.reportException(ex.getLocalizedMessage(), true);
     finally {
          try {
               conn.close();
          } catch (Exception e) {
               msgMgr.reportException(e.getLocalizedMessage(), true);
Remove it from try.
Regards,
Nitin
Edited by: Nitin Mahajan on Jun 16, 2009 6:20 PM
Edited by: Nitin Mahajan on Jun 16, 2009 6:21 PM
Edited by: Nitin Mahajan on Jun 16, 2009 6:22 PM

Strange SQL statement in my PL/SQL session

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AND ROWNUM = 1;
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Application hangs for non existing value

Hi,
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can any one brief me on this regard? why does application hangs for non exsting value?
With Regards
Boo

Hi,
At the DB level I tried to query non existing value from the table, query came out with "no rows selected" . But when I try to do the same from front end, application hangs! I just checked in the statspack report it shows like query is taking more cpu time to execute. what could be the reason for this?
when I join the v$session,v$sql to get the currently running query on database, it shows the query which try to execute from the application as active.
why it is hanging in application and why not in DB?
can any one brief me on this regard? why does application hangs for non exsting value?
With Regards
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import javax.mail.Authenticator;
import javax.mail.Message;
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import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
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private String subject = null;
private String content = null;
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public String getContent() {
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Ok, I think I see the problem:
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From dos prompt I have used the type commad.
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[2011/6/14 4:48:30:703] Info 56013 (ConnectionManager:release): Connection 197 is released
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[2011/6/14 4:48:31:31] Debug 50103 (RWCache:deleteItem): delete item for job 51
[2011/6/14 4:48:31:31] Debug 50103 (RWCacheItem:clear): job 51 become invalid
[2011/6/14 4:48:31:31] Debug 50103 (RWCache:updateCurrentCapacity): Current cache capacity is 32942484
[2011/6/14 4:48:31:46] Debug 50103 (JobManager:removeJob): removed job 51
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[2011/6/14 4:48:51:890] Info 56013 (ConnectionManager:release): Connection 199 is released
[2011/6/14 4:50:48:437] Info 56013 (ConnectionManager:release): Connection 200 is released
Most of the time when all the instances are restarted then for the first time it runs successfully.
The above code worked fine for Last two months.

Application hanging after commit issued, how to tell why?

Hi All,
We're using adf bc, jsp's and jdev 10.1.2.
The scenario is this.. I have 2 views based on the same entity(called Milk). One view is the control view Milk i.e. straightforward select, no where clause. The other one is based on a join with another entity (Area), which uses where clause parameters to output a row of Milk for every entry on the Area entity. So basically for every area there is, a milk row will be output even if that row does not exist on the milk table.
So my problem was when the user edited and saved a row which didn't actually exist on the database, the program would hang. Editing of rows that do exist pose no problem at all. So then I thought maybe I should create these rows first so that they would physically exist on the database before the edit. Still to no avail..
If it's just one row created or many rows, once the commit is issued, the application hangs. I've debugged it and nothing happens once it executes the commit line, there are no error messages, it just never progresses past this line.
I've tested with the App Module tester and I can create rows here fine. Obvisouly something is wrong or it wouldn't be happening. How can I tell why it's hanging? Or can anyone suggest what I can do. It is extremely crucial that I fix this soon so I would really appreciate any help that anyone can give me.
Thanks in advance,
Liz.

Maybe you should look into
/var/log/messages.log
/var/log/daemon.log
/var/log/kernel.log
/var/log/Xorg.0.log will be overridden, afaik.
Last edited by MadTux (2009-11-19 18:50:04)

How to find out the position in which an application hangs

Hi,
is there any possibility to find out the position in a source, in which a deployed application hangs?
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In other words, how can I see the stack of a certain process,for example, http_workerx?
Regards,
Ali
Message was edited by:
Ali Maraschi-Schouschtari

Hi Ali,
With SAP NetWeaver Composition Environment (CE) 7.1 SP3 it is very easy.
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Application hangs when using ProcessStartInfo and Process.WaitForExit.

I've looked on different threads about this, but all of them uses the Process.RedirectStandardOutput = True, which I don't.
I'm trying to open a process (console application, not made by me) to make it compile a special .acs file to a .o file. The structure is simple, the only argument is the file you want to compile.
But on certain files my application hangs when trying to open the process. Here's my code:
Dim p As New Process
Dim ps As New ProcessStartInfo
ps.Arguments = SavePath 'Path example: "C:\Program Files (x86)\Zandronum\File.acs"
ps.FileName = Path.Combine(System.AppDomain.CurrentDomain.BaseDirectory(), "Script Compilers\Zandronum\acc.exe")
ps.CreateNoWindow = False
ps.ErrorDialog = False
ps.UseShellExecute = True
ps.WindowStyle = ProcessWindowStyle.Hidden
ps.WorkingDirectory = Path.GetDirectoryName(SavePath)
Dim ErrorCaptured As Boolean = False
Try
p = Process.Start(ps)
Catch ex As Exception
ErrorCaptured = True
End Try
If ErrorCaptured = False Then
p.WaitForExit()
End If
If ErrorCaptured = True Then
Exit Sub
End If
Thanks!
//Visual Vincent
EDIT:
For starting the process I use pretty much the same code that another guy made in C#. And his code is working perfectly...
// Setup process info
processinfo = new ProcessStartInfo();
processinfo.Arguments = args;
processinfo.FileName = Path.Combine(this.tempdir.FullName, info.ProgramFile);
processinfo.CreateNoWindow = false;
processinfo.ErrorDialog = false;
processinfo.UseShellExecute = true;
processinfo.WindowStyle = ProcessWindowStyle.Hidden;
processinfo.WorkingDirectory = this.workingdir;
try
process = Process.Start(processinfo);
catch(Exception e)
// Unable to start the compiler
General.ShowErrorMessage("Unable to start the compiler (" + info.Name + "). " + e.GetType().Name + ": " + e.Message, MessageBoxButtons.OK);
return false;
// Wait for compiler to complete
process.WaitForExit();
I hope your day has been better than yesterday, but that it's worse than tomorrow...
Please mark as answer if I solved your problem. :)

Hi,
Have you compared the FileNames and Arguments of ones that work and ones that don`t? Is there any difference in them such as the ones that work do not contain blank spaces in the FileName or arguments and the ones that do work don`t contain blank spaces
in them? If you find that to be the problem then you need to add Quotes to the beginning and end of the FileName or Arguments.
My first guess is the Arguments needs the Quotes like this because, i see blank spaces in your example of the Arguments.
ps.Arguments = Chr(34) & SavePath & Chr(34)
If you say it can`t be done then i`ll try it
This actually made it. I had forgotten that blank spaces makes it a new argument, silly me. I don't use process arguments that often. ;)
Thanks alot!
I hope your day has been better than yesterday, but that it's worse than tomorrow...
Please mark as answer if I solved your problem. :)

How to set an Application Item from PL/SQL

I am attempting to set an Application Item
After login to my app, I want to retrieve a row from my SETTINGS table and populate some Application Items with the settings information so that I can
display some of that settings information on every page.
Just to start, I created one Application Item named F106_YEAR
I then created a Shared Components Application Process which executes on New Session: After Authentication
I created this process as an Anynomous PL/SQL block.
declare
aucyr varchar(4);
begin
select year into auctyr
from settings;
:F106_YEAR := aucyr;
end;
I've tried a couple of other Syntax tricks attempting to reference the Application Item F106_YEAR from within PL/SQL (like V('F106_YEAR') but nothing seems to be working.
I'm sure that I am missing something simple. Can someone tell me how to set an Application Item from PL/SQL?
Thanks in advance.

I'm still doing something wrong because this is not working for me.
I've tried both of the following versions as an Application Process set to run on New Session after Authentication:
declare
auction_year varchar(4);
begin
select year into auction_year
from PBUUC.SETTINGS where rownum < 2;
:F106_AUCTION_YEAR:=auction_year;
end;
and I also tried:
declare
auction_year varchar(4);
begin
select year into auction_year
from PBUUC.SETTINGS where rownum < 2;
APEX_UTIL.SET_SESSION_STATE (p_name, p_value);
end;
F106_YEAR is a global Item (shared components).
The select statement works just fine in SQL*PLUS so I know that it is correct.
If I run the debugger and log into the application, here is the output. Shouldn't I see my Application Process get called if it is set to run on New Session after Validation?
My Application process is named RETRIEVE_AUCTION_SETTINGS
0.01: A C C E P T: Request="P101_PASSWORD"
0.01: Metadata: Fetch application definition and shortcuts
0.01: alter session set nls_language="AMERICAN"
0.01: alter session set nls_territory="AMERICA"
0.01: ...NLS: Set Decimal separator="."
0.01: ...NLS: Set NLS Group separator=","
0.01: ...NLS: Set date format="DD-MON-RR"
0.01: ...Setting session time_zone to -04:00
0.01: NLS: wwv_flow.g_flow_language_derived_from=0: wwv_flow.g_browser_language=en-us
0.01: Fetch session state from database
0.02: ...Check session 695371898690095 owner
0.02: ...Check for session expiration:
0.02: ...Metadata: Fetch Page, Computation, Process, and Branch
0.02: Session: Fetch session header information
0.02: ...Metadata: Fetch page attributes for application 106, page 101
0.03: ...Validate item page affinity.
0.03: ...Validate hidden_protected items.
0.03: ...Check authorization security schemes
0.03: Session State: Save form items and p_arg_values
0.03: ...Session State: Save "P101_USERNAME" - saving same value: "jps"
0.03: Processing point: ON_SUBMIT_BEFORE_COMPUTATION
0.03: Branch point: BEFORE_COMPUTATION
0.03: Computation point: AFTER_SUBMIT
0.03: Tabs: Perform Branching for Tab Requests
0.03: Branch point: BEFORE_VALIDATION
0.03: Perform validations:
0.03: Branch point: BEFORE_PROCESSING
0.03: Processing point: AFTER_SUBMIT
0.03: ...Process "Set Username Cookie": PLSQL (AFTER_SUBMIT) begin owa_util.mime_header('text/html', FALSE); owa_cookie.send( name=>'LOGIN_USERNAME_COOKIE', value=>lower(:P101_USERNAME)); exception when others then null; end;
0.04: ...Process "Login": PLSQL (AFTER_SUBMIT) wwv_flow_custom_auth_std.login( P_UNAME => :P101_USERNAME, P_PASSWORD => :P101_PASSWORD, P_SESSION_ID => v('APP_SESSION'), P_FLOW_PAGE => :APP_ID||':1' );
0.06: ...Process "Clear Page(s) Cache": CLEAR_CACHE_FOR_PAGES (AFTER_SUBMIT) 101
0.06: Nulling cache for application "106" page: 101
0.00:
0.00: S H O W: application="106" page="1" workspace="" request="" session="695371898690095"
0.01: alter session set nls_language="AMERICAN"
0.01: alter session set nls_territory="AMERICA"
0.01: ...NLS: Set Decimal separator="."
0.01: ...NLS: Set NLS Group separator=","
0.01: ...NLS: Set date format="DD-MON-RR"
0.01: ...Setting session time_zone to -04:00
0.01: NLS: wwv_flow.g_flow_language_derived_from=0: wwv_flow.g_browser_language=en-us
0.01: Application 106, Authentication: CUSTOM2, Page Template: 2904114531488186
0.01: ...Session ID 695371898690095 can be used
0.01: ...Application session: 695371898690095, user=JPS
0.01: ...Determine if user "JPS" workspace "1040027630222986" can develop application "106" in workspace "1040027630222986"
0.01: ...Check for session expiration:
0.01: Session: Fetch session header information
0.01: ...Metadata: Fetch page attributes for application 106, page 1
0.01: Fetch session state from database
0.02: Branch point: BEFORE_HEADER
0.02: Fetch application meta data
0.02: Computation point: BEFORE_HEADER
0.02: Processing point: BEFORE_HEADER
0.03: Show page template header
0.03: Computation point: AFTER_HEADER
0.03: Processing point: AFTER_HEADER
0.04: Computation point: BEFORE_BOX_BODY
0.04: Processing point: BEFORE_BOX_BODY
0.04: Region: Auction_Title F106_AUCTION_YEAR

Illustrator CC 64-bit application hangs

I'm getting Illustrator CC application hangs on a win 7 system after opening up a file or even select a tool or path in files that were previously created in Ai CC, even hours before.
Also getting the following errors when a file has been finally opened after a several minutes:
"There is not enough memory available to process the appearance of an object + application hang + Illustrator CC"
I'm on tight schedules here and clients are waiting. I need the files that I created but they can't be opened or edited!
So please don't offer solutions such as uninstalling and reinstalling the application....
Here's some bug reports from the Event viewer:
The program Illustrator.exe version 17.0.0.256 stopped interacting with Windows and was closed. To see if more information about the problem is available, check the problem history in the Action Center control panel.
Process ID: 4c8
Start Time: 01ce813652169bb5
Termination Time: 34
Application Path: C:\Program Files\Adobe\Adobe Illustrator CC (64 Bit)\Support Files\Contents\Windows\Illustrator.exe
Report Id: 99292d84-ed2a-11e2-bb3c-6cf0497714bd
System
Provider
[ Name]
Application Hang
EventID
1002
[ Qualifiers]
0
Level
2
Task
101
Keywords
0x80000000000000
TimeCreated
[ SystemTime]
2013-07-15T08:43:22.000000000Z
EventRecordID
28879
Channel
Application
Computer
workstation
Security
EventData
Illustrator.exe
17.0.0.256
4c8
01ce813652169bb5
34
C:\Program Files\Adobe\Adobe Illustrator CC (64 Bit)\Support Files\Contents\Windows\Illustrator.exe
99292d84-ed2a-11e2-bb3c-6cf0497714bd
55006E006B006E006F0077006E0000000000
Binary data:
In Words
0000: 006E0055 006E006B 0077006F 0000006E
0008: 0000
In Bytes
0000: 55 00 6E 00 6B 00 6E 00 U.n.k.n.
0008: 6F 00 77 00 6E 00 00 00 o.w.n...
0010: 00 00 ..

Is it possible for you to share the file.
~Raghuveer

How to freeze or make an application hang to test a script?

  I like to test this script
tell application "System Events" to set theApps to name of processes whose background only is false
repeat with oneApp in theApps
set pState to do shell script "/bin/ps -arxo state,comm | /usr/bin/grep " & oneApp & " | /usr/bin/cut -c 1"
if pState contains "Z" then -- if the application hangs, kill it
tell application "System Events" to set pid to the unix id of process appname as Unicode text
do shell script "/bin/kill " & pid
end if
-- delay 5 -- security delay
try
do shell script "open -a /Applications/Restart.app"
end try
end repeat
It is supposed to run from time to time on my server checking if a programme is hanging and if so quitting it and restarting it.
So does anybody know how one can get a programme to hang or crash? Did several experiments with Text Edit, but could not get it to crash. Interesting question though, as we are mostly concerned about crashes not happening.
Any ideas or suggestions are welcome.    Thanks

orangekay thanks
I tried that but did not work (might be my lack of skill), or might have done it wrong though, any suggestions as to how?

Problem in reading data from serial port continuously- application hangs after sometimes

I need to read data from two COM port and order of data appearance from COM port is not fixed.
I have used small timeout and reading data in while loop continously . If my application is steady for sometime it gets hangs and afterwards it doesnt receive any data again.
Then I need to restart my application again to make it work.
I am attaching VI. Let me know any issue.
Kudos are always welcome if you got solution to some extent.
I need my difficulties because they are necessary to enjoy my success.
--Ranjeet
Attachments:
Scanning.vi ‏39 KB

billko wrote:
Ranjeet_Singh wrote:
I need to read data from two COM port and order of data appearance from COM port is not fixed.
I have used small timeout and reading data in while loop continously . If my application is steady for sometime it gets hangs and afterwards it doesnt receive any data again.
Then I need to restart my application again to make it work.
I am attaching VI. Let me know any issue.
What do you mean, "not fixed?" If there is no termination character, no start/stop character(s) or even a consistent data length, then how can you really be sure when the data starts and stops?
I probably misunderstood you though. Assuming the last case is not ture - there is a certain length to the data - then you should use the bytes at port, like in the otherwise disastrous serial port read example. In this case, it's NOT disastrous. You have to make sure that you read all the data that came through. Right now you have no idea how much data you just read. Also, if this is streaming data, you might want to break it out into a producer/consumer design pattern.
Not fixed means order is not fixed, data from any com port can come anytime. lenght is fixed, one com port have 14 byte and other 8 byte fixed..
Reading data is not an issue for me as it works nice but I have a query that why my application hangs after sometime and stops reading data from COM PORT.
Kudos are always welcome if you got solution to some extent.
I need my difficulties because they are necessary to enjoy my success.
--Ranjeet

Application hangs on strange SQL

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