Na minha experiência com um erro semelhante 12570 (leitor vs gravador), há apenas uma razão para esse erro - algo em sua rede está encerrando conexões tcp ociosas. Normalmente, este é um switch gerenciado/de firewall. Você disse que já descartou o firewall, mas não sei como. É possível que o próprio db esteja encerrando as conexões (script dba), mas lembro que foi um erro diferente.
Ora-12571 pode ser um pouco diferente. Mas ainda assim, desde que você identificou que o problema é o mesmo, pois são conexões de pool estabelecidas há muito tempo, continuarei.
Há algumas coisas que você pode fazer:
- Defina o tamanho mínimo do pool =0 na string de conexão. Isso geralmente corrige as coisas para mim. Ele permite que todo o pool seja fechado quando o aplicativo estiver ocioso. No entanto, há uma pequena chance de que, se o tráfego oscilar violentamente, o tamanho do pool de decr precise ser aumentado para fechar mais rapidamente as conexões criadas por uma corrida louca.
- Defina Expire_Time em sqlnet.ora. Não é óbvio pelo nome, essa configuração envia um pacote de sondagem, o que faz com que qualquer monitoramento ocioso do tcp seja satisfeito. O único problema aqui é que não tenho certeza de como definir as configurações do sqlnet com o provedor gerenciado. Eu estou supondo que sqlnet.ora pode ir no diretório exe, mas também estou vendo alguma indicação de que ele pode ser definido no .config na forma de (veja um exemplo de wallet_override semelhante aqui) Porque você está recebendo apenas isso no provedor gerenciado, gostaria de saber se seu cliente não gerenciado sqlnet.ora já possui essa configuração.
Eu vi isso muitas vezes ao longo dos anos e a primeira vez que aconteceu eu criei um utilitário que basicamente faz uma pesquisa binária para determinar o tempo limite exato criando conexões de durações variadas. Se ele chegar consistentemente ao mesmo tempo de término, você pode adivinhar que há uma configuração em algum lugar que está causando isso. Se for errático, então você pode ter algum tipo de falha de infraestrutura.
Infelizmente, eu o criei como um aplicativo de formulários c#, então colei o código do formulário e o código do designer abaixo:
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;
}
}
