Enligt min erfarenhet med ett liknande fel 12570 (läsare vs författare) finns det bara en anledning till detta fel - något i ditt nätverk avslutar lediga tcp-anslutningar. Vanligtvis är detta en brandvägg/hanterad switch. Du sa att du redan har uteslutit brandvägg men jag vet inte hur. Det är möjligt att db själv avslutar anslutningarna (dba-skript), men jag minns att det är ett annat fel.
Ora-12571 kan vara något annorlunda. Men eftersom du har identifierat att problemet är detsamma i och med att det är etablerade poolanslutningar så kommer jag att fortsätta.
Det finns ett par saker du kan göra:
- Ange min poolstorlek =0 i anslutningssträngen. Detta fixar i allmänhet saker för mig. Det gör att hela poolen kan stängas ute när appen är inaktiv. Det finns dock en liten chans att om din trafik svänger våldsamt, kan minska poolstorleken behöva ökas för att snabbare stänga förbindelser som skapats av en galen rusning.
- Ställ in Expire_Time i sqlnet.ora. Inte uppenbart med namnet, den här inställningen skickar ett sondpaket, vilket gör att eventuell tcp-tomgångsövervakning tillfredsställs. Det enda problemet här är att jag inte är helt säker på hur man ställer in sqlnet-inställningar med den hanterade leverantören. Jag gissar att sqlnet.ora kan gå i exe-dir men jag ser också en indikation på att den kan ställas in i .config i form av (se ett liknande exempel på wallet_override här) Eftersom du bara får detta i den hanterade leverantören undrar jag om din ohanterade klient sqlnet.ora redan har den här inställningen.
Jag har sett detta många gånger under åren och första gången det hände skapade jag ett verktyg som i princip gör en binär sökning för att bestämma den exakta timeouttiden genom att skapa anslutningar med varierande varaktighet. Om det konsekvent landar på samma uppsägningstid kan du gissa att det finns en inställning någonstans som orsakar detta. Om det är oberäkneligt, kan du ha någon form av infrastruktur som är dålig.
Tyvärr skapade jag den som en c# forms-app, så jag har klistrat in både formulärkoden och designerkoden nedan:
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;
}
}