Database connection failure

Hi,
In our environment we are using connection manager to connect to the database. The client connections are getting dropped intermittently and the users are getting ORA-25408 – Cannot safely replay call. The client connections are getting dropped even if the connection manager is not used and they are getting ORA-3113. I don't see any errors on alert.log, listener.log & listener.log at the time of connection drop. Even I cheked with the firewall team also. Can any one let me know what could be the cause for this?

user9114021 wrote:
The connection drop happens intermittently. The client is able to establish the connection but it is getting dropped at random points. Unable to predict when it is dropping.Okay, but you mention two different errors.
The ORA-25408 error results when your existing connection to a database instance fails over to another database instance. The root cause is the failure of the instance you're connected to. The secondary issue is that the processing that your session was busy with, cannot be failed over - and that your session needs to restart that processing from the start again.
So if this happens a lot, you have transparent app fail-over (called <i>TAF</i>) triggered a lot due to RAC db instance(s) failing regularly. This likely means relooking at your RAC configuration, setup and architecture - as something is not healthy.
25408, 00000, "can not safely replay call"
// *Cause: The connection was lost while doing this call. It may not be
//          safe to replay it after failover.
// *Action: Check to see if the results of the call have taken place, and then
//          replay it if desired.You did not mention RAC, but you did mention using Connection Manager. How are you using it and how and why is TAF configured?
The other error you mentioned is an ORA-3113.
03113, 00000, "end-of-file on communication channel"
// *Cause: The connection between Client and Server process was broken.
// *Action: There was a communication error that requires further investigation.
//          First, check for network problems and review the SQL*Net setup.
//          Also, look in the alert.log file for any errors. Finally, test to
//          see whether the server process is dead and whether a trace file
//          was generated at failure time.This error (from the client driver) means that the Oracle server process terminated without closing communication channel (tcp socket connection) to the client. The client attempted to talk to its server process and then discovered the server process is no longer there. This typically happens due to ORA-600 errors, where the Oracle server process hits an unrecoverable exception, dumps (writes a trace file and records an error in the alert log) and terminates without notifying the client.

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Hi
Fairly new to the MIB and its internal workings.
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Ed
<Sam Dhooper> wrote in message news:[email protected]..
Hi
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Can someone explain or provide an exampe ud script to determine database
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http://msdn.microsoft.com/en-IN/library/ms159133.aspx
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http://social.technet.microsoft.com/Forums/en-US/db4ca6c2-5445-4ff9-9f63-e20f3859cc70/error-throwing-microsoftreportingservicesdiagnosticsutilitiesreportserverstorageexception-an?forum=sqlreportingservices
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SSRS 2008: connection failure, timeout or low disk condition within the database. (rsReportServerDatabaseError)

Hi,
I have started getting this error since a week now when I try to schedule a report or change a schedule of a report.
An error occurred within the report server database. This may be due to a connection failure, timeout or low disk condition within the database. (rsReportServerDatabaseError) Get Online Help For more information about this error navigate to the report
server on the local server machine, or enable remote errors
We have SQL Server 2008 installed along with SSRS running on the server. I have never seen this happening before for almost a year now but suddenly it appeared. Along with this, report subscription is also messed up and some report are not been
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Please reply soooon !!!

Rich, hi, sorry for my english but I speak spanish...
Well, I was tried to recreate this issue and is really hard to recreate, however and as a rain from the sky, one of my customers receive the same error that you have, reviewing Windows Logs and SQL Traces there is nothing.
Just for discard security issues I decide to change permissions in my server.
1. Go to SQL Server Reporting Services Configuration Manager
2. Go to Databases
3. Verify the credentials used to connect to the database server
4. Go to your database server
5. Look for the login or user that is being used to connect to the database server from SSRS
6. Change the role of that user and convert it to Sysadmin (Relax, this is not the final solution)
7. Try again (Is not necesary to restart ANYTHING)
8. Now, your SSRS and Subscriptions must work fine
9. If your SSRS and subscriptions are working ok, you have to give some permissions to the user
10. Grant execute permissions on
master.dbo.xp_sqlagent_notify
master.dbo.xp_sqlagent_enum_jobs
master.dbo.xp_sqlagent_is_starting
msdb.dbo.sp_help_category
msdb.dbo.sp_add_category
msdb.dbo.sp_add_job
msdb.dbo.sp_add_jobserver
msdb.dbo.sp_add_jobstep
msdb.dbo.sp_add_jobschedule
msdb.dbo.sp_help_job
msdb.dbo.sp_delete_job
msdb.dbo.sp_help_jobschedule
msdb.dbo.sp_verify_job_identifiers
11. Grant select permissions on
msdb.dbo.sysjobs
msdb.dbo.syscategories
12. Grant public role to the user in the MSDB and Master DB
13. Remove the Sysadmin role to the user
14. Try again, now, your SSRS is ready to work
Regards
Pls let me know if work for you
Regards | John Bocachica | jboca.blogspot.com

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javax.servlet.ServletException: Database Connection Error
Cannot create PoolableConnectionFactory (Server connection failure during transaction. Due to underlying exception: 'java.security.AccessControlException: access denied (java.net.SocketPermission localhost resolve)'.
** BEGIN NESTED EXCEPTION **
java.security.AccessControlException
MESSAGE: access denied (java.net.SocketPermission localhost resolve)
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** END NESTED EXCEPTION **
Attempted reconnect 3 times. Giving up.)
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     org.apache.jasper.runtime.PageContextImpl.access$11(PageContextImpl.java:65)
     org.apache.jasper.runtime.PageContextImpl$12.run(PageContextImpl.java:766)
     java.security.AccessController.doPrivileged(Native Method)
     org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:764)
     org.apache.jsp.admin.login_jsp._jspService(login_jsp.java:242)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     java.lang.reflect.Method.invoke(Method.java:585)
     org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:243)
     java.security.AccessController.doPrivileged(Native Method)
     javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
     org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:272)
     org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:161)
edu.tamu.erl.database.dblibrary.DBLibraryBaseException: Database Connection Error
Cannot create PoolableConnectionFactory (Server connection failure during transaction. Due to underlying exception: 'java.security.AccessControlException: access denied (java.net.SocketPermission localhost resolve)'.
** BEGIN NESTED EXCEPTION **
java.security.AccessControlException
MESSAGE: access denied (java.net.SocketPermission localhost resolve)
STACKTRACE:
java.security.AccessControlException: access denied (java.net.SocketPermission localhost resolve)
     at java.security.AccessControlContext.checkPermission(AccessControlContext.java:264)
     at java.security.AccessController.checkPermission(AccessController.java:427)
     at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
     at java.lang.SecurityManager.checkConnect(SecurityManager.java:1031)
     at java.net.InetAddress.getAllByName0(InetAddress.java:1117)
     at java.net.InetAddress.getAllByName0(InetAddress.java:1098)
     at java.net.InetAddress.getAllByName(InetAddress.java:1061)
     at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:137)
     at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:276)
     at com.mysql.jdbc.Connection.createNewIO(Connection.java:2769)
     at com.mysql.jdbc.Connection.<init>(Connection.java:1531)
     at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
     at org.apache.commons.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:37)
     at org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:290)
     at org.apache.commons.dbcp.BasicDataSource.validateConnectionFactory(BasicDataSource.java:877)
     at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:851)
     at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540)
     at edu.tamu.erl.database.dblibrary.plugin.TomcatConnectionFactory.getConnection(TomcatConnectionFactory.java:102)
     at edu.tamu.erl.database.dblibrary.DBManager.getConnection(DBManager.java:70)
     at edu.tamu.erl.database.dblibrary.DBManager.getDBDataAccessObjectList(DBManager.java:318)
     at edu.tamu.erl.econdollars.middletire.SessionManager.getSessionStatus(SessionManager.java:157)
     at edu.tamu.erl.econdollars.middletire.SessionManager.retallyDB(SessionManager.java:637)
     at org.apache.jsp.admin.login_jsp._jspService(login_jsp.java:88)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:243)
     at java.security.AccessController.doPrivileged(Native Method)
     at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
     at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:272)
     at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:161)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:245)
     at org.apache.catalina.core.ApplicationFilterChain.access$0(ApplicationFilterChain.java:50)
     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:156)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:152)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:540)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
     at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
     at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
     at java.lang.Thread.run(Thread.java:595)
** END NESTED EXCEPTION **
Attempted reconnect 3 times. Giving up.)
     edu.tamu.erl.database.dblibrary.plugin.TomcatConnectionFactory.getConnection(TomcatConnectionFactory.java:105)
     edu.tamu.erl.database.dblibrary.DBManager.getConnection(DBManager.java:70)
     edu.tamu.erl.database.dblibrary.DBManager.getDBDataAccessObjectList(DBManager.java:318)
     edu.tamu.erl.econdollars.middletire.SessionManager.getSessionStatus(SessionManager.java:157)
     edu.tamu.erl.econdollars.middletire.SessionManager.retallyDB(SessionManager.java:637)
     org.apache.jsp.admin.login_jsp._jspService(login_jsp.java:88)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     java.lang.reflect.Method.invoke(Method.java:585)
     org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:243)
     java.security.AccessController.doPrivileged(Native Method)
     javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
     org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:272)
     org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:161)Any help would be greatly appreciated.

Hi,
Its clearly saying the connect permission is missing with the current available policy.
you add the following permisson entry to the <installed JRE>\lib\security\java.policy file.
(e.g) C:\Program Files\Java\j2re1.4.2_08\lib\security\java.policy
permission java.security.AllPermission;
grant{
permission java.security.AllPermission;
If the application is running standalone then the code is allowed uncontrolled access but for webapplicatons running through browser, the security check is performed for the configured JRE.
Regards
Karthik
<[email protected]>

Using database connection in a servlet and get errors after 8 hours

Hey,
I'm running a poker script using applet/servlets and it works great. But for some reason about about 8 hours that database layer stops working. At first I thought it was the connections to mySQL that were timing out (because im using connection pooling) but after turning pooling off (I now create the connection each time) I'm still seeing that same error (I can create a connection but when I do an action ex. like a select statment I get an error). What i'm wondering could it be that the driver I load with Class.forName() some how unloads it's self after x amount of time not being used? Not sure if that is it but if anyone could give me some insight that would be great. The Error i recieve is below:
INFO: Database Event:DatabaseController: Error executing database query.
ERROR: Communications link failure due to underlying exception:
** BEGIN NESTED EXCEPTION **
java.net.SocketException
MESSAGE: Software caused connection abort: recv failed
STACKTRACE:
java.net.SocketException: Software caused connection abort: recv failed
     at java.net.SocketInputStream.socketRead0(Native Method)
     at java.net.SocketInputStream.read(Unknown Source)
     at com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:104)
     at com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:144)
     at com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:172)
     at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1839)
     at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2288)
     at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2784)
     at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1531)
     at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1622)
     at com.mysql.jdbc.Connection.execSQL(Connection.java:2370)
     at com.mysql.jdbc.Connection.execSQL(Connection.java:2297)
     at com.mysql.jdbc.Statement.executeQuery(Statement.java:1183)
     at com.softnet.database.DatabaseController.executeDatabaseQuery(DatabaseController.java:190)
     at com.softnet.games.GameServer.validateUser(GameServer.java:438)
     at com.softnet.games.GameServer.handleData(GameServer.java:113)
     at com.softnet.network.HttpConnectionThread.run(HttpServletListener.java:191)
** END NESTED EXCEPTION **
I know the query is good because it works all other times just not after about 8 hours.
--Z3r0CooL

Hey,
Thanks for the responces. For the connection pooling I would open 5 connections and keep them open. So i though maybe after 8 hours after not being used they would timeout. Thats why i turned off conection pooling and create a new connection each time. Anyways i'll post the code below incase i made a mistake somewhere.
package com.softnet.database;
/************************ DatabaseControler **************************/
import java.sql.*;
import java.util.*;
import com.softnet.database.DatabaseConnectionPool;
import com.softnet.database.DatabaseSettings;
public class DatabaseController
implements DatabaseListener
     //Used to make sure the database driver is loaded
     private boolean databaseDriverState = false;
     //Used to store a database connection
     private Connection databaseConnection = null;
     //If to user connection pooling or not
     private boolean useConnectionPooling = false;
     //Used to hold the connection pool varible
     private DatabaseConnectionPool connectionPool = null;
     //Used to store database settings
     private DatabaseSettings databaseSettings;
     //Used to hold the DatabaseController listeners
     private List databaseControllerListeners = new ArrayList();
     //min number of connections for connection pool
     private int minNumberOfConnections = 1;
     //max number of connections for connection pool -1 is unlimited
     private int maxNumberOfConnections = -1;
     //DatabaseController Constructors
     public DatabaseController(DatabaseSettings databaseSettings)
          this.databaseSettings = databaseSettings;
          databaseDriverState = loadDatabaseDriver(databaseSettings.getDatabaseDriver());
     public DatabaseController(DatabaseSettings databaseSettings, boolean useConnectionPooling, int minNumberOfConnections, int maxNumberOfConnections)
          this.databaseSettings = databaseSettings;
          this.useConnectionPooling = useConnectionPooling;
          this.minNumberOfConnections = minNumberOfConnections;
          this.maxNumberOfConnections = maxNumberOfConnections;
          if(useConnectionPooling == true)
               connectionPool = new DatabaseConnectionPool(databaseSettings, minNumberOfConnections, maxNumberOfConnections);
               connectionPool.addDatabaseListener(this);
          else
               databaseDriverState = loadDatabaseDriver(databaseSettings.getDatabaseDriver());
     public DatabaseController() {}
     //Database Settings Get/Set
     public DatabaseSettings getDatabaseSettings()
          return databaseSettings;
     public void setDatabaseSettings(DatabaseSettings databaseSettings)
          this.databaseSettings = databaseSettings;
     //Connection Pooling Get/Set
     public boolean getConnectionPooling()
          return useConnectionPooling;
     public void setConnectionPooling(boolean useConnectionPooling, int minNumberOfConnections, int maxNumberOfConnections)
          this.useConnectionPooling = useConnectionPooling;
          this.minNumberOfConnections = minNumberOfConnections;
          this.maxNumberOfConnections = maxNumberOfConnections;
          if(useConnectionPooling == true)
               if(connectionPool == null)
                    connectionPool = new DatabaseConnectionPool(databaseSettings, minNumberOfConnections, maxNumberOfConnections);
                    connectionPool.addDatabaseListener(this);
          else
               if(connectionPool != null)
                    connectionPool.destroyConnections();
                    connectionPool.removeDatabaseListener(this);
                    connectionPool = null;
     //Return if there connected
     public boolean isConnected()
          boolean isConnected;
          if(databaseConnection != null)
               isConnected = true;
          else
               isConnected = false;
          return isConnected;
     //Used to connect to database or get a connection for the connection pool
     public void connect()
          if(databaseDriverState == false)
               databaseDriverState = loadDatabaseDriver(databaseSettings.getDatabaseDriver());
          //If we dont have a current connection, make one
          if(databaseConnection == null && databaseDriverState == true)
               if(useConnectionPooling == false)
                    try
                         databaseConnection = DriverManager.getConnection(databaseSettings.getDatabaseURL(), databaseSettings.getUserName(), databaseSettings.getUserPassword());
                    catch (SQLException sqle)
                         //Raise event
                         raiseDatabaseEvent("DatabaseController: Error connecting to database. \nERROR: " + sqle.getMessage());
                         databaseConnection = null;
               else
                    databaseConnection = connectionPool.getConnection();
     //Used to disconnect from the database or give back the connection to the connection pool
     public void disconnect()
          if(databaseConnection != null)
               if(useConnectionPooling == false)
                    try
                         //Close DB Connection
                         databaseConnection.close();
                    catch(SQLException ignore) {}
                    finally
                         databaseConnection = null;
               else
                    connectionPool.returnConnection(databaseConnection);
                    databaseConnection = null;
     public ResultSet executeDatabaseQuery(String sSQL)
          ResultSet databaseResult = null;
          if(databaseConnection != null)
               try
                    Statement databaseStatement = databaseConnection.createStatement();
                    databaseResult = databaseStatement.executeQuery(sSQL);
               catch(SQLException sqle)
                    //Raise event
                    raiseDatabaseEvent("DatabaseController: Error executing database query.\nSQL: " + sSQL + "\nERROR: " + sqle.getMessage());
          return databaseResult;
     public int executeDatabaseUpdate(String sSQL)
          int rowsAffected = -1;
          if(databaseConnection != null)
               try
                    Statement databaseStatement = databaseConnection.createStatement();
                    rowsAffected = databaseStatement.executeUpdate(sSQL);
               catch(SQLException sqle)
                    //Raise event
                    raiseDatabaseEvent("DatabaseController: Error executing database update.\nSQL: " + sSQL + "\nERROR: " + sqle.getMessage());
          return rowsAffected;
     //Used to load the Database Driver
     private boolean loadDatabaseDriver(String databaseDriver)
          boolean driverLoaded;
          if(databaseDriver.equals("") == false)
               try
                    //Load Database Driver
                    Class.forName(databaseDriver).newInstance();
                    driverLoaded = true;
               catch (Exception e)
                    //Raise event
                    raiseDatabaseEvent("DatabaseController: Error loading database driver. \nERROR: " + e.getMessage());
                    driverLoaded = false;
          else
               driverLoaded = false;
          return driverLoaded;
     //Wrap the DatabaseConnectionPool Error to the DatabaseController
     public void databaseEventOccurred(DatabaseEvent de)
          raiseDatabaseEvent(de.getErrorMessage());
     //Event Handling Code
     //Used to add database listeners (Its sync'd so you can change the listeners when firing an event)
public synchronized void addDatabaseListener(DatabaseListener databaseControllerListener)
databaseControllerListeners.add(databaseControllerListener);
//Used to remove a listener from the list (Its sync'd so you can change the listeners when firing an event)
public synchronized void removeDatabaseListener(DatabaseListener databaseControllerListener)
databaseControllerListeners.remove(databaseControllerListener);
//Used to send the raise event to the listeners
private synchronized void raiseDatabaseEvent(String databaseError)
DatabaseEvent databaseEvent = new DatabaseEvent(this, databaseError);
Iterator listeners = databaseControllerListeners.iterator();
while(listeners.hasNext())
     DatabaseListener listener = (DatabaseListener) listeners.next();
listener.databaseEventOccurred(databaseEvent);
/********************* DatabaseConnectionPool **************/
package com.softnet.database;
import java.io.*;
import java.sql.*;
import java.util.*;
import com.softnet.database.*;
import com.softnet.database.DatabaseSettings;
public class DatabaseConnectionPool
     //min number of connections
     private int minNumberOfConnections = 1;
     //max number of connections -1 is unlimited
     private int maxNumberOfConnections = -1;
     //Store the connections
     protected Hashtable databaseConnections = null;
     //Database Info
     protected DatabaseSettings databaseSettings;
     //to hold Driver state
     private boolean databaseDriverState = false;
     //To hold connection checker
     private DatabaseConnectionCheck connectionChecker = null;
     //Used to hold the DatabaseConnectionPool listeners
     private List databaseConnectionPoolListeners = new ArrayList();
     public DatabaseConnectionPool(DatabaseSettings databaseSettings, int minNumberOfConnections, int maxNumberOfConnections)
          this.databaseSettings = databaseSettings;
          this.minNumberOfConnections = minNumberOfConnections;
          this.maxNumberOfConnections = maxNumberOfConnections;
          //Load Driver
          databaseDriverState = loadDatabaseDriver(databaseSettings.getDatabaseDriver());
          //Create connection
          createConnections();
     public DatabaseConnectionPool(int minNumberOfConnections, int maxNumberOfConnections)
          this.minNumberOfConnections = minNumberOfConnections;
          this.maxNumberOfConnections = maxNumberOfConnections;
     //Database Settings Get/Set
     public DatabaseSettings getDatabaseSettings()
          return databaseSettings;
     public void setDatabaseSettings(DatabaseSettings databaseSettings)
          this.databaseSettings = databaseSettings;
     //Driver State Get
     public boolean getDatabaseDriverState()
          return databaseDriverState;
     public void createConnections()
          if(databaseDriverState == false)
               databaseDriverState = loadDatabaseDriver(databaseSettings.getDatabaseDriver());
          //Create all connections and load the minimum in the Hashtable
          if(databaseConnections == null)
               if(databaseDriverState == true && minNumberOfConnections != 0)
                    databaseConnections = new Hashtable();
                    for(int i = 0; i < minNumberOfConnections; i++)
                         try
                              databaseConnections.put(DriverManager.getConnection(databaseSettings.getDatabaseURL(), databaseSettings.getUserName(), databaseSettings.getUserPassword()), Boolean.FALSE);
                         catch(SQLException sqle)
                              //Problem break loop and destroy any connections
                              destroyConnections();
                              //Raise event
                              raiseDatabaseEvent("DatabaseConnectionPool: Error creating database connections. \nERROR: " + sqle.getMessage());
                              break;
          //If no connection check exists create one
          if(connectionChecker == null)
               connectionChecker = new DatabaseConnectionCheck(this);
               connectionChecker.start();
     public Connection getConnection()
          Connection connection = null;
          boolean errorWithConnection = false;
          Enumeration connections = databaseConnections.keys();
          synchronized (databaseConnections)
               while(connections.hasMoreElements())
                    errorWithConnection = false;
                    connection = (Connection) connections.nextElement();
                    Boolean state = (Boolean) databaseConnections.get(connection);
                    //If connection is not used, use it.
                    if(state == Boolean.FALSE)
                         try
                              connection.setAutoCommit(true);
                         catch(SQLException e)
                              //Problem with connection remove connection and replace it
                              databaseConnections.remove(connection);
                              try
                                   connection = DriverManager.getConnection(databaseSettings.getDatabaseURL(), databaseSettings.getUserName(), databaseSettings.getUserPassword());
                              catch(SQLException sqle)
                                   errorWithConnection = true;
                         if(errorWithConnection == false)
                              // Update the Hashtable to show this one's taken
                              databaseConnections.put(connection, Boolean.TRUE);
                              // Return the connection
                              return connection;
               //All connections being used check to max to see if we can make a new one
               if(maxNumberOfConnections == -1 || maxNumberOfConnections > databaseConnections.size())
                    try
                         connection = DriverManager.getConnection(databaseSettings.getDatabaseURL(), databaseSettings.getUserName(), databaseSettings.getUserPassword());
                    catch(SQLException sqle)
                         errorWithConnection = true;
                    if(errorWithConnection == false)
                         databaseConnections.put(connection, Boolean.TRUE);
                         return connection;
          //If not connections free and max connections reached wait for a free connection
          return getConnection();
     public void returnConnection(Connection connection)
          boolean errorWithConnection = false;
          //Make sure connection still works
          try
               connection.setAutoCommit(true);
          catch(SQLException e)
               //Problem with connection remove connection and replace it
               databaseConnections.remove(connection);
               try
                    connection = DriverManager.getConnection(databaseSettings.getDatabaseURL(), databaseSettings.getUserName(), databaseSettings.getUserPassword());
               catch(SQLException sqle)
                    errorWithConnection = true;
          if(errorWithConnection == false)
               databaseConnections.put(connection, Boolean.FALSE);
     public void destroyConnections()
          Connection connection = null;
          if(databaseConnections != null)
               //Close all connections
               Enumeration connections = databaseConnections.keys();
               while (connections.hasMoreElements())
                    connection = (Connection) connections.nextElement();
                    try
                         connection.close();
                    catch(SQLException ignore) {}
               //Free up hashtable
               databaseConnections = null;
     private boolean loadDatabaseDriver(String databaseDriver)
          boolean driverLoaded;
          if(databaseDriver.equals("") == false)
               try
                    //Load Database Driver
                    Class.forName(databaseDriver);
                    driverLoaded = true;
               catch (ClassNotFoundException cnfe)
                    //Raise event
                    raiseDatabaseEvent("DatabaseController: Error loading database driver. \nERROR: " + cnfe.getMessage());
                    driverLoaded = false;
          else
               driverLoaded = false;
          return driverLoaded;
     //Event Handling Code
     //Used to add database listeners (Its sync'd so you can change the listeners when firing an event)
public synchronized void addDatabaseListener(DatabaseListener databaseConnectionPoolListener)
databaseConnectionPoolListeners.add(databaseConnectionPoolListener);
//Used to remove a listener from the list (Its sync'd so you can change the listeners when firing an event)
public synchronized void removeDatabaseListener(DatabaseListener databaseConnectionPoolListener)
databaseConnectionPoolListeners.remove(databaseConnectionPoolListener);
//Used to send the raise event to the listeners
private synchronized void raiseDatabaseEvent(String databaseError)
DatabaseEvent databaseEvent = new DatabaseEvent(this, databaseError);
Iterator listeners = databaseConnectionPoolListeners.iterator();
while(listeners.hasNext())
     DatabaseListener listener = (DatabaseListener) listeners.next();
listener.databaseEventOccurred(databaseEvent);
class DatabaseConnectionCheck extends Thread
     private DatabaseConnectionPool connectionPool;
     DatabaseConnectionCheck(DatabaseConnectionPool connectionPool)
          this.connectionPool = connectionPool;
     public void run()
          try
               while(true)
                    //check threads every 30 seconds
                    this.sleep(300000);
                    if(connectionPool.databaseConnections != null)
                         Connection connection = null;
                         Enumeration connections = connectionPool.databaseConnections.keys();
                         synchronized (connectionPool.databaseConnections)
                              while(connections.hasMoreElements())
                                   connection = (Connection) connections.nextElement();
                                   Boolean state = (Boolean) connectionPool.databaseConnections.get(connection);
                                   //If connection is not used, use it.
                                   if(state == Boolean.FALSE)
                                        try
                                             connection.setAutoCommit(true);
                                        catch(SQLException e)
                                             //Problem with connection remove connection and replace it
                                             connectionPool.databaseConnections.remove(connection);
                                             try
                                                  connection = DriverManager.getConnection(connectionPool.databaseSettings.getDatabaseURL(), connectionPool.databaseSettings.getUserName(), connectionPool.databaseSettings.getUserPassword());
                                             catch(SQLException sqle)
                                                  connection = null;
                                             // Update the Hashtable with new connection if its not null
                                             if(connection != null)
                                                  connectionPool.databaseConnections.put(connection, Boolean.FALSE);
          catch(InterruptedException ignored) {}
Basicly the why it works is the connection pool hold the database connections. When the user needs a connection they use the database controller to request a connection (By create a instance and called the connect() method) and the connection is either created or grabed from the connection pool. After the user is done with the connection they call the disconnect() method which closes the connection or returns it to the connection pool.
--Z3r0CooL

JDeveloper problem setting up a database connection

I am having some problem setting up a connection to my database. Before I say any more let me explain what I need. I need 2 database connections 1 to a 10g R3 database and one to an 8.0.5.
I do realize that JDeveloper will only connect back to 8.1.7 because of the JDBC version that is installed with it.
What I really need to know is "Is it possible to define and use 2 different versions of JDBC" I really don't want to move back to the version that works with both because I am afraid of what performance/benefits I will lose from the latest and greatest.
The latest version that I can determine will work with 8.0.5 is the last version for 9i.
Any Ideas would be helpful.
The reason for this situation is that I have a production database that I will have to keep up with until the full version of the system is complete so that is why I even care about 8.0.5.
Thanks alot for your time,
Thom

I have a similar problem and I would much appreciate any help in this matter.
I have a wireless network set at home with two computers connected to it:
My workstation called Home-ws and my laptop called Acer. I can access the d:\ drive of my workstation from my laptop without any problem.
On my workstation I installed the Oracle 10g product and on my laptop I installed Oracle SQL Developer. On SQL developer I am trying to create a connection to the Oracle server:
My settings are as below:
Connection name: orcl_system
User name: system
Password: ******
Host name: Home-ws
Port: 1521
SID: orcl
When I push test I am getting the following error message:
Status: Failure –Io exception: The Network Adapter could not establish the connection
Are there any special settings that should be made set up a wireless connection to my database?
Then I did the following things below:
1. I downloaded from oracle.com the instantclient-basic-win32-10.2.0.2-20060508.zip file and unzipped it in a folder called instantclient_10_2. There were a number of DLL and two jar files plus sqlplus.exe
2. I started sqlplus from that server
3. sqlplus failed with a similar error as sql developer.
4. I checked for tnsping. There is no tnsping such and exe on my laptop. I looks like I have to install the DLLs I downloaded them but there are no instructions about how to install them. Should I just copy them in system32 folder?
5. I looked for firewalls on my Home-ws workstation (where my oracle server is installed) and on my Acer laptop. The firewalls were activated. I added on exception called oracle for port 1521 on both computers and tried to connect again. I tried with both TCP and UDP options and it did not work in both cases.
I am out of ideas. Any help would be much appreciated.
Thank you in advance for your help.
Julian

Problem in using context param for storing database connection information

Hello Friends,
I am new to struts & jsp.I am developing a project in struts.I have 1 jsp page called editProfile.jsp.On submitting this page it will call 1 action class.The action class in turn will call the Plain old java class where I have written the logic for updating User Profile.
I have created context-param in web.xml for database connection information like dbURL , dbUserName , dbPassword , jdbcDriver.Now I want to use these connection information in my Business logic(Plain Old Java Class).As we can use context parameter only in jsp & servlets , I am setting the variables of my business logic class with these context param in jsp itself.
now when I am calling the updateProfile method of Business logic class from Action class it is giving error as all the connection variables which I set in jsp for my business logic class has become null again.
I am not getting.If once I have set those variables how come they are becoming null again???Please help me.Any Help will be highly appreciated.Thanx in advance.

This is the code I have written
web.xml file
<context-param>
<param-name>jdbcDriver</param-name>
<param-value>oracle.jdbc.driver.OracleDriver</param-value>
</context-param>
<context-param>
<param-name>dbUrl</param-name>
<param-value>jdbc:oracle:thin:@localhost:1521:gd</param-value>
</context-param>
<context-param>
<param-name>dbUserName</param-name>
<param-value>system</param-value>
</context-param>
<context-param>
<param-name>dbPassword</param-name>
<param-value>password</param-value>
</context-param>
EditProfile.jsp
<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@ page import="java.sql.*" %>
<jsp:useBean id="EditProfile" scope="application"
class="com.myapp.struts.EditProfile"/>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Edit My Profile</title>
</head>
<body>
<form action="submitEditProfileForm.do" focus="txt_FirstName" method="post">
<%
EditProfile.setjdbcDriver(application.getInitParameter("jdbcDriver"));
EditProfile.setdbURL(application.getInitParameter("dbURL"));
EditProfile.setdbUserName(application.getInitParameter("dbUserName"));
EditProfile.setdbPassword(application.getInitParameter("dbPassword"));
-----------more code goes here------------
EditActionProfile.java
package com.myapp.struts;
import javax.servlet.jsp.jstl.core.Config;
import org.apache.struts.action.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.sql.*;
public class EditProfileAction extends Action {
public EditProfileAction()
public ActionForward execute(
ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception
try
if (isCancelled(request))
return mapping.findForward("mainpage");
EditProfileForm epf = (EditProfileForm)form;
EditProfile ep = new EditProfile();
String temp = ep.updateProfile(epf.getTxt_FirstName(),epf.getTxt_MiddleName() , epf.getTxt_LastName() , epf.getTxt_Address() , epf.getTxt_Email() );
if(temp.equals("SUCCESS"))
return mapping.findForward("success");
else
return mapping.findForward("failure");
catch(SQLException e)
System.out.println("error" + e.getMessage());
return mapping.findForward("failure");
EditProfile.java class (My Business Logic Class)
package com.myapp.struts;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.*;
public class EditProfile {
private String dbURL;
private String dbUserName , jdbcDriver;
private String dbPassword;
private Connection con;
private Statement stmt;
public EditProfile()
public void setdbURL(String s )
this.dbURL = s;
public void setdbUserName(String s )
this.dbUserName = s;
public void setdbPassword(String s )
this.dbPassword = s;
public void setjdbcDriver(String s )
this.jdbcDriver = s;
public String updateProfile(String firstname , String middlename , String lastname , String address , String email)
throws SQLException, ClassNotFoundException , java.lang.InstantiationException , IllegalAccessException
try
String s1 = new String("update usr set first_name='" + firstname + "' , middle_name='" + middlename + "' , last_name='" + lastname +"' , address='" + address + "' , email_id='" + email + "' where usr_key=1" );
con = this.init();
System.out.println("after init");
stmt = con.createStatement();
int rslt = stmt.executeUpdate(s1);
System.out.println("after excute update");
stmt.close();
if(rslt>=1)
return "SUCCESS";
else
return "Failure";
finally
if (null != con)
con.close();
public Connection init() throws SQLException, ClassNotFoundException
Class.forName(jdbcDriver);
con = DriverManager.getConnection(dbURL, dbUserName, dbPassword);
return con;
public void close(Connection connection) throws SQLException
if (!connection.isClosed())
connection.close();
}

Database Connection Pattern

Hi:
I'm looking for a best practice to centralizing access to the database. All the examples that I have seen on the Sun site and the Internet look a little clumsy. What I'm trying to ask is this. Instead of CODING a connection object, Statment object etc. like the examples provide - every time I make a query. Is there a better way of centralizing make making this code generic.
For example:
I have an object that describes my records say ModelBunny
mBunny.setEars
mBunny.setTail
mBunny.setColor
I have an object that describes all my database queries that I want to execute say DataBunny
dBunny.getBunnyByID
dBunny.getAllBunnies
dBunny.getBunnyByColor
I created a transaction object that allows me to load up multiple sql commands into the transaction object for more complex calls.
I pass the transaction object into a generic connection object that opens, runs the transaction and then closes. For inserts, updates and deletes this pattern works great - I pass back an array of int and let the user know what happened - success/failure.
Here is the root of the issue:
in my generic connection object - I create a query method. Where I pass in a single query statement that returns a - resultset (yes here is my problem).
The resultset is only valid if the connection remains open - then as soon as I close out the connection in my "finally" - I'm done, toast, otherwise - screwed.
I thought of making a method where I can manually close my connection from the calling object - but I want something more brainless where another developer using this framework won't forget and leave the connection dangling.
Is there some way I can process the resultset generically into an arraylist and then pass back the arraylist?
I'm not even certain that this pattern that I'm using is wise. Everybody seems keen on writing the same boiler plate code every time they want to execute a command. I don't think this is good design practice and make the code unmanageable. I'd like some advice or a pointer to something better.
I'm using OracleXE for my test bed. I'd like to leave everything as generic as possible because our platform will likely shift to another DBMS.
Thanks for your help.

FYI: Here is the meat of the generic class that I'm talking about.
public class DbConnection {
private String _urlDbCnn       = "";   // the JDBC url to the database
private String _username       = "";   // a valid username to access the database
private String _password       = "";   // a valid password to access the database
private String _dbDriver       = "";   // a valid JDBC driver
private Connection _cnn            = null; // this will be the active connection
private String _sqlStatement   = null; // this will be the statement to execute against the database
public DbConnection(){
this("oracle.jdbc.OracleDriver",
"jdbc:oracle:thin:@//192.168.15.200:1521/xe",
"usernamehere",
"passwordhere");
} // constructor - nothing
public DbConnection(String nwDbDriver, String nwDbURL,
String nwDbUsername, String nwDbPassword){
this.setDbDriver(nwDbDriver);
this.setUrlDbCnn(nwDbURL);
this.setUsername(nwDbUsername);
this.setPassword(nwDbPassword);
} // constructor - DbDriver, DbUrl, DbUser, DbPassword
private void initializeConnection(){
// try - get database driver
try{
DriverManager.registerDriver (new oracle.jdbc.OracleDriver());
// try - initialize the database connection
try{
this._cnn = DriverManager.getConnection(this._urlDbCnn,
this._username,
this._password);
}catch(SQLException e){
ErrorTrap trap = new ErrorTrap(ErrorTrapMessage.DataConnectionNotIntitialized, e);
} // catch - try and initialize the database connection
}catch(SQLException e){
ErrorTrap trap = new ErrorTrap(ErrorTrapMessage.DataConnectionDriverFailedToLoad, e);
} // catch - try and get database driver
} // method - OpenConnection
public ResultSet executeQuery(DbTransaction nwTransaction){
ResultSet results = null; // batch results are returned as an array of integers
// initialize the database connection
initializeConnection();
// try - access the database connection and execute a batch of statements
try{
// if - check that the connection is open
if (this._cnn.isClosed()== false){
// create a statement object from the connection
Statement sqlQuery = this._cnn.createStatement();
// if - check that there is at least one command present
if (nwTransaction.size() >= 1 ){
// execute the batch success/error results are returned as an int array
results = sqlQuery.executeQuery(nwTransaction.get(0).getCommand());
} // if - check that there is at least one command present
} // if - check that the connection is open
catch(SQLException e){
ErrorTrap trap = new ErrorTrap(ErrorTrapMessage.DataSQLTransactionFailed, e);
} // catch - SQL Query
finally{
// try - close database connection
try{
//if - check that the connection is open
if(this._cnn.isClosed() == false){
// close the database connection
this._cnn.close();
} //if - check that the connection is open
}catch(SQLException e){
ErrorTrap trap = new ErrorTrap(ErrorTrapMessage.DataConnectionNotOpen, e);
} // catch - try and close database connection
} // finally
return results;
} // method - executeQuery
public int [] executeTransaction(DbTransaction nwTransaction){
int [] results = null; // batch results are returned as an array of integers
// initialize the database connection
initializeConnection();
// try - access the database connection and execute a batch of statements
try{
// if - check that the connection is open
if (this._cnn.isClosed()== false){
// create a statement object from the connection
Statement batchStatement = this._cnn.createStatement();
// for - loop through each command added to the transaction
for(DbCommand command:nwTransaction){
// add the sql command for batch execution
batchStatement.addBatch(command.getCommand());
} // for - loop through each command added to the transaction
// execute the batch success/error results are returned as an int array
results = batchStatement.executeBatch();
} // if - check that the connection is open
catch(SQLException e){
ErrorTrap trap = new ErrorTrap(ErrorTrapMessage.DataSQLTransactionFailed, e);
} // catch - SQL Query
finally{
// try - close database connection
try{
//if - check that the connection is open
if(this._cnn.isClosed() == false){
// close the database connection
this._cnn.close();
} //if - check that the connection is open
}catch(SQLException e){
ErrorTrap trap = new ErrorTrap(ErrorTrapMessage.DataConnectionNotOpen, e);
} // catch - try and close database connection
} // finally
return results;
} // method - executeCommands

Timeout: Tuxedo kills the service but not the database connection

Hi all,
I am experiencing some performance problems on my system due an efficient SQL and a Tuxedo improper timeout handling.
A service is using a "problematic" SQL (we will tune it but it's not the main problem). After 60 seconds from the execution, Tuxido kills the services for a timeout.
At this point I would like Tuxedo to notify DB2 database as well in order to stop processing the SQL. Instead the SQL continues running on the database (also if the service is killed) and this produce a gradual slow down of the performances.
In the UBBCONFIG, we are using a service configuration like the following timeout configuration:
.RESOURCES
SCANUINIT 5
SANITYSCAN 6
BLOCKTIME 12
.SERVICES
DEFAULT: SVCTIMEOUT=45
service1 SVCTIMEOUT=60 TRANTIME=60
service2 SVCTIMEOUT=60 TRANTIME=60
Note: not all the services are listed in the .SERVICES section and we are using the default NOTIFY as well as an OPENINFO.
Can you please help me in finding a configuration to kill both the services and the database?
Thanks in advance,
Benedetto

Hi Benedetto.
First of all, Tuxedo doesn't kill services, it kills servers. Your UBBCONFIG file specifies three timeouts, BLOCKTIME, SVCTIMEOUT, and TRANTIME.
BLOCKTIME specifies how long a Tuxedo API that needs a response will wait for that response. If the response isn't received in that period of time, Tuxedo will return TPETIME to the caller. As with any failure, if the request was part of a transaction, the transaction is marked rollback only. Note, this timeout does not affect the request, whether sitting in a server's IPC queue or currently executing in a server.
SVCTIMEOUT is a much more severe timeout and determines how long Tuxedo will allow a service implementation to execute. If a service implementation doesn't reply within the SVCTIMEOUT period, Tuxedo will issue an OS level KILL request to kill the process. If the server is marked restartable, Tuxedo will then try to restart the server assuming none of the restart limits have been reached. Killing the server causes the request to be lost within the server so the caller will stay blocked until BLOCKTIME is reached at which point the above actions will take place.
TRANTIME is the amount of time Tuxedo allows a transaction to remain active and viable. When this period expires, Tuxedo will mark the transaction as timed out with the only option being rollback. As well, Tuxedo aborts any API requests that would normally cause messaging to occur, i.e., making a tpcall() within a timed out transaction will fail without any attempt to call the service.
So in your case, the issue is partially that you have the values of your timeouts in somewhat reverse order. Typically we see BLOCKTIME being the smallest value, with TRANTIME typically larger than BLOCKTIME, and SVCTIMEOUT larger even still, although there are good reasons for exceptions to this guideline. Part of the reasoning behind this is that killing a server is a significant thing and its usually best to try and let the server complete whatever its doing, if if the work has been timed out either due to BLOCKTIME or TRANTIME, since the cost of killing and restarting a server is significant.
Tuxedo will notify the database of the transaction status when the application finally issues a tpcommit() or a tpabort() request, but not until then. Although, if SVCTIMEOUT is hit, then killing the server should cause the database connection to be lot.
If you could describe the behavior you are seeing and the relevant portions of your ULOG we can try to make some sense of what is happening.
Regards,
Todd Little
Oracle Tuxedo Chief Architect

Testdrive N4S with Fedora 8 - Database Start failure

Hello,
I installed the System N4S successfully on a Fedora 8, kernel 2.6.23, but Database start ends up with failure.
Message from startdb.log:
Starting XServer
    12916 XSERVER Found other running x_server with version 'X64/LINUX 7.6.00   Build 018-123-119-055'
    12902 XSERVER started, 'already...'
So 30. Dez 19:01:41 CET 2007
Starting database
Starting Database Instance...
Error! XUser not found!
Opening Database...
Error! XUser not found!
DB-log Files indicate some missing crypt-libs:
trc file: "/sapdb/data/wrk/niserver_machine64.trace", trc level: 1, release: "700"
Sun Dec 30 18:13:50 2007
ERROR => DlLoadLib: dlopen()= /sapdb/programs/lib/libsapcrypto.so: cannot open shared object file: No such file or directory -> DLENOACCESS (0,Success) [dlux.c       314]
ERROR => CDKLoadSAPCryptModule: Loading of /sapdb/programs/lib/libsapcrypto.so failed! [cdkapi.c     204]
This library was obviously not included in the testdrive.
However this seems to result only in a warning and to be not the real problem.
I saw somewhere already a comment advising an upgrade of the database-version because of some library conflicts with an other problem:
https://forums.sdn.sap.com/click.jspa?searchID=7692305&messageID=3719866
Can somebody advise on that topic?
Thank you and kind regards,
Axel

Dear Axel,
having no XUSERs (needed for database connection) makes an automated database start impossible. Can you check, if you have a XUSER file in the home directory of n4sadm?
$> su - n4sadm
#> cd
#> ls -la .XUSER.62
-rw------- 1 n4sadm sapsys 1724 Apr 20 2007 .XUSER.62
If it is there, but you can't connect to the database, it should make a copy of the old one with:
mv -a .XUSER.62 .XUSER.62.org
and create a new one, which you should do if the file isn't there as well:
/sapdb/programs/bin/xuser -U DEFAULT -u sapn4s,sapn4sadm -d N4S -n n4shost -S SAPR3 -t 0 -I 0 set
/sapdb/programs/bin/xuser -U c -u control,sapn4sadm -d N4S -n n4shost -S SAPR3 -t 0 -I 0 set
/sapdb/programs/bin/xuser -U c_J2EE -u control,sapn4sadm -d N4S -n n4shost -S SAPR3 -t 0 -I 0 set
/sapdb/programs/bin/xuser -U w -u superdba,sapn4sadm -d N4S -n n4shost -S SAPR3 -t 0 -I 0 set
After executing the 4 commands, a new .XUSER.62 file will be there, which allows you to start the database.
Thanks,
Hannes

Error "-7500" occurred in the current database connection "LCA"

LC & apo box rebooted due hardware failure now once LC is up then all cif quuese are failing with "An SQL error occurred when executing Native SQL" error. Looking further it indicates lc issue.
Getting multiple dumps in apo box with :-
Short text
    An SQL error occurred when executing Native SQL.
What happened?
    The error "-7500" occurred in the current database connection "LCA".
What can you do?
    Note down which actions and inputs caused the error.
    To process the problem further, contact you SAP system
    administrator.
    Using Transaction ST22 for ABAP Dump Analysis, you can look
    at and manage termination messages, and you can also
    keep them for a long time.
How to correct the error
    Database error text........: "POS(1) DCOM HRESULT:APS_COM_VERSION_GET,00000002"
    Database error code........: "-7500"
    Triggering SQL statement...: "EXECUTE PROCEDURE "APS_COM_VERSION_GET""
    Internal call code.........: "[DBDS/NEW DSQL]"
    Please check the entries in the system log (Transaction SM21).
Steps already taken :-
1) LC apps start/stop
2) Index recovery done from DBMGUI
Any suggestion on this ? Only expert comments please.

>
> Steps already taken :-
> 1) LC apps start/stop
did you restart liveCache from LC10 -> administration-> ...?
-any errors in lcinit.log ? (/sapdb/data/wrk/)
-any errors in knldiag or knldiag.err
-I would suggest to open SAP message and let them to login and check it
Regards
Ivan

Error in new/select database connection

i am new at sql developer. i am getting the following error in new/select database connection
I have filled the following details
Connection Name : hr_orcl
Username : hr
Password : hr
Connection Typer: Basic, Role: Default
Hostname: localhost
Port : 1521
SID : orcl
I click on TEST & get the following error message displayed
" Status : Failure -Test failed: Listener refused connection with the following error:ORA-12505, TNS:listener does not currently know of SID given in connec desciptor"

Hi,
You don't say if you actually have a local database installed. If not, you need too. If you already do, then the most common case is Oracle 10g or 11g Express Edition. In that case the default SID is XE, as noted in the following similar thread:
Re: Connecting to Oracle Database 10g Express Edition
If you need to install a database, you can get 10g or 11g XE here:
http://www.oracle.com/technetwork/database/express-edition/downloads/index.html
The 10g XE release has a smaller memory and disk footprint if that makes a difference to you.
Regards,
Gary
SQL Developer Team

Database connection failure

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