In mijn ervaring met een soortgelijke fout 12570 (lezer versus schrijver) is er maar één reden voor deze fout:iets op uw netwerk beëindigt inactieve tcp-verbindingen. Meestal is dit een firewall/beheerde switch. Je zei dat je firewall al hebt uitgesloten, maar ik weet niet hoe. Het is mogelijk dat de db zelf de verbindingen beëindigt (dba-script), maar ik herinner me dat dat een andere fout was.
Ora-12571 is misschien iets anders. Maar toch, aangezien je hebt vastgesteld dat het probleem hetzelfde is, omdat het al lang bestaande poolverbindingen zijn, blijf ik doorgaan.
U kunt een aantal dingen doen:
- Stel min poolgrootte =0 in in de verbindingsreeks. Dit lost over het algemeen dingen voor mij op. Hiermee kan het hele zwembad worden afgesloten wanneer de app inactief is. Er is echter een kleine kans dat als uw verkeer hevig schommelt, de decr-pool groter moet worden om verbindingen die zijn ontstaan door een waanzinnige rush sneller te sluiten.
- Stel Expire_Time in in sqlnet.ora. Niet duidelijk door zijn naam, deze instelling verzendt een probe-pakket, waardoor aan elke tcp idle monitoring wordt voldaan. Het enige probleem hier is dat ik niet helemaal zeker weet hoe ik sqlnet-instellingen moet instellen met de beheerde provider. Ik vermoed dat sqlnet.ora in de exe-map kan, maar ik zie ook een indicatie dat het kan worden ingesteld in de .config in de vorm van (zie een vergelijkbaar voorbeeld van wallet_override hier) Omdat je alleen dit krijgt in de beheerde provider, vraag ik me af of uw onbeheerde client sqlnet.ora deze instelling al heeft.
Ik heb dit in de loop der jaren vaak gezien en de eerste keer dat het gebeurde, heb ik een hulpprogramma gemaakt dat in feite een binaire zoekopdracht uitvoert om de exacte time-outtijd te bepalen door verbindingen van verschillende duur te maken. Als het consequent op dezelfde beëindigingstijd belandt, kun je raden dat er ergens een instelling is die dit veroorzaakt. Als het grillig is, heb je misschien een soort infrastructuurprobleem.
Helaas heb ik het gemaakt als een c#-formulieren-app, dus ik heb zowel de formuliercode als de ontwerpercode hieronder geplakt:
Form1.cs:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Oracle.ManagedDataAccess.Client;
namespace TimeoutTest
{
public partial class Form1 : Form
{
List<TestConnection> connections;
Int32 connectionCount;
Int32 multiplier;
Int32 initialConnectionWait;
TestConnection controlConnection = null;
public Form1()
{
InitializeComponent();
}
private void BtStart_Click(object sender, EventArgs e)
{
connectionCount = Int32.Parse(InConnections.Text);
multiplier = Int32.Parse(InMultiplier.Text);
initialConnectionWait = Int32.Parse(InInitialWait.Text);
DisplayMessage("Starting control connection\r\n");
controlConnection = new TestConnection();
controlConnection.ErrorOccured += new EventHandler(controlConnection_ErrorOccured);
controlConnection.IsControlConnection = true;
controlConnection.StartTest(2);
connections = new List<TestConnection>();
DisplayMessage("Spinning up {0} connections...\r\n", connectionCount);
for (int i = 0, idleTime=initialConnectionWait; i < connectionCount; i++, idleTime*=multiplier)
{
TestConnection connection = new TestConnection();
connection.Notified += new TestConnection.NotificationEventHandler(connection_Notified);
connection.ErrorOccured += new EventHandler(connection_ErrorOccured);
connection.TestCompleted += new EventHandler(connection_TestCompleted);
connection.StartTest(idleTime);
connections.Add(connection);
}
DisplayMessage("");
}
void controlConnection_ErrorOccured(object sender, EventArgs e)
{
DisplayMessage("\r\nControl connection error, aborting!!!");
BtCancel_Click(this, EventArgs.Empty);
}
void connection_TestCompleted(object sender, EventArgs e)
{
TestConnection currentConnection = (TestConnection)sender;
if (currentConnection == connections.Last())
DisplayMessage("\r\nAll tests complete. Done");
}
void connection_ErrorOccured(object sender, EventArgs e)
{
//stop any active connection.
foreach(TestConnection tc in connections)
{
tc.CompletionTimer.Enabled=false;
}
TestConnection currentConnection = (TestConnection)sender;
Int32 upperTime = currentConnection.IdleTime;
Int32 lowerTime = 0;
Int32 index = connections.IndexOf(currentConnection);
//if this is not the first connection...
if(index > 0)
{
//...then set the lower time based on the previous connection
lowerTime = connections[index-1].IdleTime;
}
//get the difference between the lower and upper as the new range to work on
Int32 range = upperTime - lowerTime;
//divide the range over the number of connections to get the new interval
Int32 interval = range / this.connectionCount;
connections.Clear();
//if the interval is too small try to reduce the number of connections
while (interval < 2 && this.connectionCount > 2)
{
this.connectionCount--;
DisplayMessage("\r\nConnections too high for current resolution. Reducing to {0} connections.", this.connectionCount);
interval = range / this.connectionCount;
}
if(interval < 2)
{
DisplayMessage("\r\nResolution cannot be increased. Done.");
}
else
{
DisplayMessage("\r\nRestarting test with min:{0}, max{1}, resolution{2}.", lowerTime, upperTime, interval);
//create the new connections
for (int i = connectionCount-1, idleTime = upperTime-interval; i >= 0; i--, idleTime-=interval)
{
TestConnection connection = new TestConnection();
connection.Notified += new TestConnection.NotificationEventHandler(connection_Notified);
connection.ErrorOccured += new EventHandler(connection_ErrorOccured);
connection.TestCompleted += new EventHandler(connection_TestCompleted);
connection.StartTest(idleTime);
connections.Insert(0,connection);
}
this.connectionCount = connections.Count;
}
}
private void BtCancel_Click(object sender, EventArgs e)
{
//stop any active connection.
foreach (TestConnection tc in connections)
{
tc.CompletionTimer.Enabled = false;
tc.Command.Connection.Close();
}
DisplayMessage("Stopped running tests.");
}
void connection_Notified(object o, Form1.TestConnection.NotificationEventArgs e)
{
DisplayMessage(e.Message);
}
private void DisplayMessage(String message)
{
DisplayMessage("{0}", message);
}
private void DisplayMessage(String message, params Object[] args)
{
OutStatus.AppendText(String.Format(message, args) + "\r\n");
}
public class TestConnection
{
public Boolean IsControlConnection { get; set; }
public OracleCommand Command { get; private set; }
public Timer CompletionTimer { get; private set; }
public String ConnectionId { get; private set; }
public Int32 IdleTime
{
get
{
return CompletionTimer.Interval / 1000;
}
set
{
CompletionTimer.Interval = value * 1000;
}
}
#region Events and Delegates
public event EventHandler ErrorOccured;
public event EventHandler TestCompleted;
public class NotificationEventArgs : EventArgs
{
public NotificationEventArgs(String message)
{
this.Message = message;
}
public String Message { get; set; }
}
public delegate void NotificationEventHandler(object o, NotificationEventArgs e);
public event NotificationEventHandler Notified;
private void Notify(String message)
{
if (Notified != null)
{
Notified(this, new NotificationEventArgs(message));
}
}
public void Notify(String format, params object[] args)
{
this.Notify(String.Format(format, args));
}
#endregion
public TestConnection()
{
CompletionTimer = new Timer();
CompletionTimer.Tick += new EventHandler(CompleteTest);
Command = new OracleCommand(
"select 'saddr:' || saddr || '-sid:' || sid || '-serial#:' || serial# || '-audsid:' || audsid || '-paddr:' || paddr || '-module:' || module from gv$session where audsid=Userenv('SESSIONID')");
Command.Connection = new OracleConnection(Configuration.OracleConnectionString);
}
public String StartTest(Int32 idleTime)
{
Command.Connection.Open();
ConnectionId = (String)Command.ExecuteScalar();
Notify("Started test with idle time={0}, id={1}.", idleTime, ConnectionId);
IdleTime = idleTime;
CompletionTimer.Enabled = true;
return ConnectionId;
}
private void CompleteTest(object sender, EventArgs e)
{
if (!IsControlConnection)
CompletionTimer.Enabled = false;
try
{
Command.ExecuteScalar();
Notify("Test complete on connection with idle time={0}, id={1}.", IdleTime, ConnectionId);
if (TestCompleted != null)
TestCompleted(this, EventArgs.Empty);
}
catch (OracleException ex)
{
if (ex.Number == 12571)
{
if (ErrorOccured != null)
{
Notify("Found error on connection with idle time={0}, id={1}.", IdleTime, ConnectionId);
ErrorOccured(this, EventArgs.Empty);
}
}
else
{
Notify("Unknown error occured on connection with timeout {0}, Error: {1}, \r\n{2}",(IdleTime).ToString(), ex, ConnectionId);
}
}
catch (Exception ex)
{
Notify("Unknown error occured on connection with timeout {0}, Error: {1}, \r\n{2}", (IdleTime).ToString(), ex, ConnectionId);
}
finally
{
if(!IsControlConnection)
Command.Connection.Close();
}
}
}
private void InConnections_TextChanged(object sender, EventArgs e)
{
Int32.TryParse(InConnections.Text,out connectionCount);
Int32.TryParse(InMultiplier.Text,out multiplier);
Int32.TryParse(InInitialWait.Text, out initialConnectionWait);
OutLongestConnection.Text = (Math.Pow(multiplier,connectionCount-1) * initialConnectionWait).ToString();
}
private void Form1_Load(object sender, EventArgs e)
{
InConnections_TextChanged(this, EventArgs.Empty);
}
}
}
Form1.designer.cs:
namespace TimeoutTest
{
partial class Form1
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.BtStart = new System.Windows.Forms.Button();
this.OutStatus = new System.Windows.Forms.TextBox();
this.InConnections = new System.Windows.Forms.MaskedTextBox();
this.label1 = new System.Windows.Forms.Label();
this.label3 = new System.Windows.Forms.Label();
this.InInitialWait = new System.Windows.Forms.MaskedTextBox();
this.InMultiplier = new System.Windows.Forms.MaskedTextBox();
this.label2 = new System.Windows.Forms.Label();
this.BtCancel = new System.Windows.Forms.Button();
this.label4 = new System.Windows.Forms.Label();
this.OutLongestConnection = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// BtStart
//
this.BtStart.Location = new System.Drawing.Point(13, 394);
this.BtStart.Name = "BtStart";
this.BtStart.Size = new System.Drawing.Size(75, 23);
this.BtStart.TabIndex = 0;
this.BtStart.Text = "Start";
this.BtStart.UseVisualStyleBackColor = true;
this.BtStart.Click += new System.EventHandler(this.BtStart_Click);
//
// OutStatus
//
this.OutStatus.Location = new System.Drawing.Point(13, 13);
this.OutStatus.Multiline = true;
this.OutStatus.Name = "OutStatus";
this.OutStatus.ReadOnly = true;
this.OutStatus.ScrollBars = System.Windows.Forms.ScrollBars.Both;
this.OutStatus.Size = new System.Drawing.Size(766, 375);
this.OutStatus.TabIndex = 1;
//
// InConnections
//
this.InConnections.Location = new System.Drawing.Point(180, 397);
this.InConnections.Mask = "00";
this.InConnections.Name = "InConnections";
this.InConnections.Size = new System.Drawing.Size(22, 20);
this.InConnections.TabIndex = 2;
this.InConnections.Text = "10";
this.InConnections.TextChanged += new System.EventHandler(this.InConnections_TextChanged);
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(108, 400);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(66, 13);
this.label1.TabIndex = 3;
this.label1.Text = "Connections";
//
// label3
//
this.label3.AutoSize = true;
this.label3.Location = new System.Drawing.Point(289, 399);
this.label3.Name = "label3";
this.label3.Size = new System.Drawing.Size(113, 13);
this.label3.TabIndex = 5;
this.label3.Text = "Initial Connection Wait";
//
// InInitialWait
//
this.InInitialWait.Location = new System.Drawing.Point(408, 396);
this.InInitialWait.Mask = "00";
this.InInitialWait.Name = "InInitialWait";
this.InInitialWait.Size = new System.Drawing.Size(21, 20);
this.InInitialWait.TabIndex = 4;
this.InInitialWait.Text = "60";
this.InInitialWait.TextChanged += new System.EventHandler(this.InConnections_TextChanged);
//
// InMultiplier
//
this.InMultiplier.Location = new System.Drawing.Point(262, 396);
this.InMultiplier.Mask = "0";
this.InMultiplier.Name = "InMultiplier";
this.InMultiplier.Size = new System.Drawing.Size(21, 20);
this.InMultiplier.TabIndex = 2;
this.InMultiplier.Text = "2";
this.InMultiplier.TextChanged += new System.EventHandler(this.InConnections_TextChanged);
//
// label2
//
this.label2.AutoSize = true;
this.label2.Location = new System.Drawing.Point(208, 400);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(48, 13);
this.label2.TabIndex = 3;
this.label2.Text = "Multiplier";
//
// BtCancel
//
this.BtCancel.Location = new System.Drawing.Point(13, 436);
this.BtCancel.Name = "BtCancel";
this.BtCancel.Size = new System.Drawing.Size(75, 23);
this.BtCancel.TabIndex = 6;
this.BtCancel.Text = "Cancel";
this.BtCancel.UseVisualStyleBackColor = true;
this.BtCancel.Click += new System.EventHandler(this.BtCancel_Click);
//
// label4
//
this.label4.AutoSize = true;
this.label4.Location = new System.Drawing.Point(451, 399);
this.label4.Name = "label4";
this.label4.Size = new System.Drawing.Size(102, 13);
this.label4.TabIndex = 7;
this.label4.Text = "Longest Connection";
//
// OutLongestConnection
//
this.OutLongestConnection.AutoSize = true;
this.OutLongestConnection.Location = new System.Drawing.Point(559, 399);
this.OutLongestConnection.Name = "OutLongestConnection";
this.OutLongestConnection.Size = new System.Drawing.Size(102, 13);
this.OutLongestConnection.TabIndex = 8;
this.OutLongestConnection.Text = "Longest Connection";
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(791, 582);
this.Controls.Add(this.OutLongestConnection);
this.Controls.Add(this.label4);
this.Controls.Add(this.BtCancel);
this.Controls.Add(this.label3);
this.Controls.Add(this.InInitialWait);
this.Controls.Add(this.label2);
this.Controls.Add(this.InMultiplier);
this.Controls.Add(this.label1);
this.Controls.Add(this.InConnections);
this.Controls.Add(this.OutStatus);
this.Controls.Add(this.BtStart);
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private System.Windows.Forms.Button BtStart;
private System.Windows.Forms.TextBox OutStatus;
private System.Windows.Forms.MaskedTextBox InConnections;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.MaskedTextBox InInitialWait;
private System.Windows.Forms.MaskedTextBox InMultiplier;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.Button BtCancel;
private System.Windows.Forms.Label label4;
private System.Windows.Forms.Label OutLongestConnection;
}
}