Memory problems with PreparedStatements

Driver: 9.0.1 JDBC Thin
I am having memory problems using "PreparedStatement" via jdbc.
After profiling our application, we found that a large number oracle.jdbc.ttc7.TTCItem objects were being created, but not released, even though we were "closing" the ResultSets of a prepared statements.
Tracing through the application, it appears that most of these TTCItem objects are created when the statement is executed (not when prepared), therefore I would have assumed that they would be released when the ResultSet is close, but this does not seem to be the case.
We tend to have a large number of PreparedStatement objects in use (over 100, most with closed ResultSets) and find that our application is using huge amounts of memory when compared to using the same code, but closing the PreparedStatement at the same time as closing the ResultSet.
Has anyone else found similar problems? If so, does anyone have a work-around or know if this is something that Oracle is looking at fixing?
Thanks
Bruce Crosgrove

From your mail, it is not very clear:
a) whether your session is an HTTPSession or an application defined
session.
b) What is meant by saying: JSP/Servlet is growing.
However, some pointers:
a) Are there any timeouts associated with session.
b) Try to profile your code to see what is causing the memory leak.
c) Are there references to stale data in your application code.
Marilla Bax wrote:
hi,
we have some memory - problems with the WebLogic Application Server
4.5.1 on Sun Solaris
In our Customer Projects we are working with EJB's. for each customer
transaction we create a session to the weblogic application server.
now there are some urgent problems with the java process on the server.
for each session there were allocated 200 - 500 kb memory, within a day
the JSP process on our server is growing for each session and don't
reallocate the reserved memory for the old session. as a work around we
now restart the server every night.
How can we solve this problem ?? Is it a problem with the operating
system or the application server or the EJB's ?? Do you have problems
like this before ?
greetings from germany,

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Tel. (32)4/239.90.10
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Message Edited by warmbells on 01-Nov-2009 06:19 PM

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For everyone having memory problems with this board

I have been working on my memory problems with this board. Memtest failed every pass yet memory was fine and board was fine. Was using Kingstone Value Ram
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set preformance to fast
set memory to
2.5
4
4
8
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Hello,
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Sp_fulltext_service ‘Load_os_resources’, 1
Go
--you might also need to run:
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--go
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3.
Uninstall the Adobe ifilter (because it defaulted to having spaces or the folder name is too long).
4.
Reinstall the Adobe iFilter and when it prompts for where to install it, change it to: C:\Program Files\Adobe\PDFiFilter
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C:\Program Files\Adobe\PDFiFilter\BIN
NOTE: it must include the BIN folder
NOTE: If you had the OLD location that included spaces, remove it from the path environment variable.
6. Start SQL Server
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Solved!
Go to Solution.

YOUR SPECS:AMD Turion™ 64 X2 Dual-Core Mobile Technology TL58• AMD M690VMemory4 • Configured with 2048MB DDR2 SDRAM
You have a really good unit mobo wise to utilize. With those initial problems you should have taken it to an authorized service provider and have unit checked out. Be that as it may-why you took out the memory modules is beyond me, and yes it is feasible that damage to the board housing or module may have occurred. Look at the module(s) and see if you observe cracks in the gold thread or board crack, especially where the split notch is. Suggest that you recheck the seating of the memory module until you hear a click noise. Check within the housing area for a small sinle cable and ensure if there it is connected.
WHEA-Logger situation..... response is as follows.
A corrected hardware error occurred.
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Error Type: Memory Hierarchy Error
TLB = translation lookaside buffer, part of the MMU used to perform virtual mapping). Machine check errors are hardware errors - this error is telling you that the CPU detected a hardware error but was able to correct it. This is not a good sign - check temperatures and voltages. Disabling windows reporting of machine check errors will simply ignore the problem - it will still exist! (and its highly likely that if you are getting correctable errors you are also getting uncorrectable errors sometimes).
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Memory problem with JTextFields

Hello,
I have a wierd problem with JTextField and the memory.
I need to fill a JPanel with different Components (including JTextFields), then do some calculation, remove the Components and filling the JPanel again.
When i so this too often my i get an OutOfMemory Exception. I narrowed to problem down and wrote a small sample program to demonstrate the problem.
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When i only use JButtons to fill the Panel everything works fine.
Has anyone an idea why this problem occurs and how i can work around it?
[Edit] I tested it whith java 1.5.0_06, 1.5.0_11, 1.6.0_02
Thanks
Marc
import java.awt.Frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryUsage;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class MemoryTestDLG extends JDialog {
     public MemoryTestDLG(Frame owner) {
          // create Dialog with one Button that calls the testMethod
          super(owner);
          JButton b = new JButton("doIT ...");
          b.addActionListener(new ActionListener() {
               public void actionPerformed(ActionEvent e) {
                    doIT();
                    setVisible(false);
          getContentPane().add(b);
          pack();
     public void doIT() {
          // Testmethod that fills a JPanel 20 times with Components and clears it
          // again
          JPanel p = new JPanel();
          long memUse1 = 0;
          long memUse2 = 0;
          long memUseTemp = 0;
          for (int count = 0; count < 20; count++) {
               // Clear the panel
               p.removeAll();
               // Get memory usage before the task
               Runtime.getRuntime().gc();
               memUse1 = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage()
                         .getUsed();
               // Fill Panel with components
               for (int i = 0; i < 200; i++) {
                    // The Buttons seem to be released without any problem
                    p.add(new JButton("test" + Math.random()));
                    // JTextFields are not released when used from the dialog.
                    p.add(new JTextField("test " + Math.random()));
               // get memory usage after the task
               Runtime.getRuntime().gc();
               memUseTemp = memUse2;
               memUse2 = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage()
                         .getUsed();
               // print Memory results
               System.out.println("Memory Usage: " + f(memUse1) + "   ->"
                         + f(memUse2) + " [ Used:" + f(memUse2 - memUse1)
                         + " ] [ Freed: " + f(memUseTemp - memUse1) + "]");
     public String f(long m) // formats the output
          String s = "" + m;
          while (s.length() < 8)
               s = " " + s;
          return s;
     public static void main(String[] args) {
          MemoryTestDLG d = new MemoryTestDLG(null);
          System.out
                    .println("------------------ Direct Call (all is OK) -------------------");
          d.doIT(); // Memory is freed with every call to JPanel.removeAll()
          System.out
                    .println("------------ Call from Dialog (memory is not freed) -------------");
          // The Memory keeps blocked
          d.setModal(true);
          d.setVisible(true);
          System.exit(0);
}Message was edited by:
marcvomorc

Thank you for your answer,
In this sample the programm does not run out of memory. But when you look at the output you see, that in the first run (direct call) the memory ist freed immediately when tha panel is cleared but in the second run (from the Button) the memory usage is getting bigger and bigger. Wenn you change the number of components to 2000 (4000)
// Fill Panel with components
        for (int i = 0; i < 2000; i++) {
            // The Buttons seem to be released without any problem
//... ...and use the default memory settings (69mb heap) the programm runns out of memory.
I get the following output:
------------------ Direct Call (all is OK) -------------------
Memory Usage:   445504   -> 8121016 [ Used: 7675512 ] [ Freed: -445504]
Memory Usage:   617352   -> 8114336 [ Used: 7496984 ] [ Freed: 7503664]
Memory Usage:   810488   -> 8491768 [ Used: 7681280 ] [ Freed: 7303848]
Memory Usage:   943704   -> 8114976 [ Used: 7171272 ] [ Freed: 7548064]
Memory Usage:   836760   -> 8505072 [ Used: 7668312 ] [ Freed: 7278216]
Memory Usage:   978352   -> 8114784 [ Used: 7136432 ] [ Freed: 7526720]
Memory Usage:   835552   -> 8498288 [ Used: 7662736 ] [ Freed: 7279232]
Memory Usage:   977096   -> 8114312 [ Used: 7137216 ] [ Freed: 7521192]
Memory Usage:   835640   -> 8498376 [ Used: 7662736 ] [ Freed: 7278672]
Memory Usage:   977296   -> 8115000 [ Used: 7137704 ] [ Freed: 7521080]
Memory Usage:   835392   -> 8504872 [ Used: 7669480 ] [ Freed: 7279608]
Memory Usage:   976968   -> 8115192 [ Used: 7138224 ] [ Freed: 7527904]
Memory Usage:   836224   -> 8501624 [ Used: 7665400 ] [ Freed: 7278968]
Memory Usage:   977840   -> 8115120 [ Used: 7137280 ] [ Freed: 7523784]
Memory Usage:   835664   -> 8498256 [ Used: 7662592 ] [ Freed: 7279456]
Memory Usage:   976856   -> 8114384 [ Used: 7137528 ] [ Freed: 7521400]
Memory Usage:   835784   -> 8502848 [ Used: 7667064 ] [ Freed: 7278600]
Memory Usage:   977360   -> 8114592 [ Used: 7137232 ] [ Freed: 7525488]
Memory Usage:   835496   -> 8502720 [ Used: 7667224 ] [ Freed: 7279096]
Memory Usage:   976440   -> 8115128 [ Used: 7138688 ] [ Freed: 7526280]
------------ Call from Dialog (memory is not freed) -------------
Memory Usage:   866504   -> 8784320 [ Used: 7917816 ] [ Freed: -866504]
Memory Usage: 7480760   ->14631152 [ Used: 7150392 ] [ Freed: 1303560]
Memory Usage: 14245264   ->22127104 [ Used: 7881840 ] [ Freed:   385888]
Memory Usage: 19302896   ->27190744 [ Used: 7887848 ] [ Freed: 2824208]
Memory Usage: 27190744   ->35073944 [ Used: 7883200 ] [ Freed:        0]
Memory Usage: 31856624   ->39740176 [ Used: 7883552 ] [ Freed: 3217320]
Memory Usage: 39740176   ->47623040 [ Used: 7882864 ] [ Freed:        0]
Memory Usage: 44410480   ->52293864 [ Used: 7883384 ] [ Freed: 3212560]
Memory Usage: 52293864   ->58569304 [ Used: 6275440 ] [ Freed:        0]
Memory Usage: 58569304   ->64846400 [ Used: 6277096 ] [ Freed:        0]
Exception occurred during event dispatching:
java.lang.OutOfMemoryError: Java heap spacewhen I outcomment the adding of the JButtons the amount of freed memory is 0 in the second run. So my guess is, that there is a problem with freeing the memory for the JTextFields.
Memory Usage:   447832   -> 6509960 [ Used: 6062128 ] [ Freed: 6332768]
Memory Usage:   722776   -> 6785632 [ Used: 6062856 ] [ Freed: 5787184]
------------ Call from Dialog (memory is not freed) -------------
Memory Usage:   468880   -> 6770240 [ Used: 6301360 ] [ Freed: -468880]
Memory Usage: 6770240   ->13016264 [ Used: 6246024 ] [ Freed:        0]
Memory Usage: 13016264   ->19297080 [ Used: 6280816 ] [ Freed:        0]
Memory Usage: 19297080   ->25570152 [ Used: 6273072 ] [ Freed:        0]
Memory Usage: 25570152   ->31849160 [ Used: 6279008 ] [ Freed:        0]
Memory Usage: 31849160   ->38124368 [ Used: 6275208 ] [ Freed:        0]
Memory Usage: 38124368   ->44402072 [ Used: 6277704 ] [ Freed:        0]
Memory Usage: 44402072   ->50677928 [ Used: 6275856 ] [ Freed:        0]
Memory Usage: 50677928   ->56955880 [ Used: 6277952 ] [ Freed:        0]
Memory Usage: 56955880   ->63232152 [ Used: 6276272 ] [ Freed:        0]
Exception occurred during event dispatching:
java.lang.OutOfMemoryError: Java heap spaceAdditionally the JPanel I am using is not displayed on the screen. It stays invisible the whole time, but i cannot work around that, because the calculation is depending on the values being in components on the JPanel)
Marc

Memory problem with loading a csv file and displaying 2 xy graphs

Hi there, i'm having some memory issues with this little program.
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Attachments:
read from file test.vi ‏106 KB

Hi lerman,
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- avoid datacopies when handling big arrays. You can show buffer creation using menu->tools->advanced->show buffer allocation
- use SGL instead of DBL when possible...
Message Edited by GerdW on 05-12-2009 10:02 PM
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

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i have a problem trying to select information when the "select" has a byte restrict.
The table in database is:
CREATE TABLE `positions` (
`PKID` int(10) unsigned NOT NULL auto_increment,
`POSCODE` varbinary(30) NOT NULL,
`ISWTURN` binary(1) NOT NULL,
`QTT_GAMES` int(10) unsigned NOT NULL default '1',
PRIMARY KEY (`PKID`),
UNIQUE KEY `UNIQ_POS` (`POSCODE`,`ISWTURN`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
And the test code to get the qtt_games is :
conn = DriverManager.getConnection (url,user,pwd);
byte bcode[] = poscode.getByteArrayCode();
// bcode is inserted ok in another preparedstatement...
String query = "SELECT qtt_games FROM positions "+
"WHERE poscode=? and iswturn=?";
PreparedStatement pstmt = conn.prepareStatement(query);
pstmt.setBytes (1,bcode);
pstmt.setByte (2,poscode.getIsWhiteTurn()); //it returns a byte
ResultSet rs = pstmt.executeQuery (query);
When pstmt.executeQuery is reached, it's thrown the exception:
com.mysql.jdbc.exceptions.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '=? and iswturn=?' at line 1
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:936)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2870)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1573)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1665)
at com.mysql.jdbc.Connection.execSQL(Connection.java:3170)
at com.mysql.jdbc.Connection.execSQL(Connection.java:3099)
at com.mysql.jdbc.Statement.execute(Statement.java:695)
at app.server.bbdd.MYSQLBDManager.getGamesBasicInfo(MYSQLBDManager.java:942)
at app.server.bbdd.MYSQLBDManager.main(MYSQLBDManager.java:1068)
Can anybody tell me what's wrong?? I think the query is ok, but don't know what's happening with this...
Lots of thanks.

Hi,
sorry, i know i've post this same message by error in "new to java" thread.... (i'm new in the forum... can i delete the wrong comment??)
The SQLState is 42000 (syntax error), but it doesn't give me much information because i had already searched in google why can be the cause of it, but there are only a few comments about problems like this, without a solution...
The column poscode in the table positions contains an array of bytes that codify a position in a chess board. I've to use this in the WHERE clause because i'm developing a chess game consulting project where there are millions of different positions and i've to get the games that have the same position in it's position history.
The code to insert the positions is:
query = "INSERT INTO positions VALUES "+
"(null,?,?,default) "+
"ON DUPLICATE KEY UPDATE qtt_games=qtt_games+1";
pstmt = conn.prepareStatement(query,Statement.RETURN_GENERATED_KEYS);
pstmt.setBytes(1,bcode);
pstmt.setByte(2,poscode.getIsWhiteTurn());
pstmt.executeUpdate();
which works ok and positions can be seen from mysql browser, but i can't select them using the PreparedStatement..
I have been searching a lot of information about this problem with no results... this is the why i posted this...
Any help will be useful, thanks.

Having screen rendering / memory problems with Microsoft Outlook 2013 and full screen mode with large 2560x1440 dual monitors

MS Outlook 2013 seems to work fine for a while until a) enough time passes or b) I have multiple MS Outlook windows open. Then I start to see all sorts of graphical issues ranging from certain parts of the outlook window not rendering to certain functions
locking etc. Occassionally, when I decrease from full screen I get the screens to render correctly, making me think there's something unique with full screen mode that is causing the issue. There seems to me to be quite a bit of memory issues
with this version.
I have a beast of a graphics card, 32gb of RAM, and a fast SSD, so don't think its the machine.
Thoughts?

Hi,
Does this happen to other applications?
If it's specific to Outlook, consider to check the hardware acceleration option:
Go to FILE tab -> Options -> Advanced -> Display -> Disable hardware graphics acceleration, turn this option on or off to check the result.
If the issue persists, please also consider whether any 3rd-party add-ins are interfering with Outlook, we can start Outlook in Safe Mode:
Press Win + R, type "outlook.exe /safe" in the blank box, press Enter.
If there's no problem in Safe Mode, disable the suspicious add-ins to verify which caused the problem.
Regards,
Melon Chen
TechNet Community Support
It's recommended to download and install
Configuration Analyzer Tool (OffCAT), which is developed by Microsoft Support teams. Once the tool is installed, you can run it at any time to scan for hundreds of known issues in Office
programs.

Memory problems with PreparedStatements

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