Dalam pengalaman saya dengan kesalahan serupa 12570 (pembaca vs penulis) hanya ada satu alasan untuk kesalahan ini - sesuatu di jaringan Anda menghentikan koneksi tcp yang tidak digunakan. Biasanya ini adalah firewall/switch yang dikelola. Anda bilang Anda sudah mengesampingkan firewall tapi saya tidak yakin bagaimana caranya. Mungkin saja db itu sendiri yang mengakhiri koneksi (skrip dba), tapi saya ingat itu adalah kesalahan yang berbeda.
Ora-12571 mungkin sedikit berbeda. Tapi tetap saja karena Anda telah mengidentifikasi bahwa masalahnya sama yaitu koneksi kumpulan yang sudah lama terjalin, saya akan terus melanjutkan.
Ada beberapa hal yang dapat Anda lakukan:
- Tetapkan ukuran kumpulan min =0 dalam string koneksi. Ini biasanya memperbaiki hal-hal untuk saya. Ini memungkinkan seluruh kumpulan ditutup saat aplikasi tidak digunakan. Namun, ada kemungkinan kecil bahwa jika lalu lintas Anda berubah drastis, ukuran kumpulan decr mungkin perlu ditingkatkan untuk lebih cepat menutup koneksi yang dibuat oleh terburu-buru.
- Tetapkan Expire_Time di sqlnet.ora. Tidak jelas namanya, pengaturan ini mengirimkan paket probe, yang menyebabkan pemantauan tcp idle terpenuhi. Satu-satunya masalah di sini adalah saya tidak sepenuhnya yakin bagaimana mengatur pengaturan sqlnet dengan penyedia terkelola. Saya menduga bahwa sqlnet.ora dapat masuk di direktori exe tetapi saya juga melihat beberapa indikasi bahwa itu dapat diatur dalam .config dalam bentuk (lihat contoh wallet_override serupa di sini) Karena Anda hanya mendapatkan ini di penyedia terkelola, saya ingin tahu apakah klien Anda yang tidak terkelola sqlnet.ora sudah memiliki pengaturan ini.
Saya telah melihat ini berkali-kali selama bertahun-tahun dan pertama kali itu terjadi, saya membuat sebuah utilitas yang pada dasarnya melakukan pencarian biner untuk menentukan waktu tunggu yang tepat dengan membuat koneksi dengan durasi yang bervariasi. Jika secara konsisten mendarat pada waktu penghentian yang sama, Anda dapat menebak bahwa ada pengaturan di suatu tempat yang menyebabkan hal ini. Jika tidak menentu, maka Anda mungkin memiliki semacam infrastruktur yang rapuh.
Sayangnya saya membuatnya sebagai aplikasi formulir c#, jadi saya telah menempelkan kode formulir dan kode desainer di bawah ini:
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;
}
}
