oracle - ODP.NET 托管驱动程序在命令超时的情况下不返回控制权

Question

我正在使用 ODP.NET 托管驱动程序 12.1.0.2.1(ODAC 12c 第 3 版)并发现了严重错误。如果在命令执行期间超时导致连接池中的线程和连接丢失。

这个测试总是失败:

[TestMethod]
[ExpectedException(typeof (Oracle.ManagedDataAccess.Client.OracleException))]
[Timeout(70000)]
public void OracleCommandTimeoutTest()
{
    const string connectionString =
        "user id=user;password=pass;data source=192.168.1.1:1521\db";
    using (var connection = new Oracle.ManagedDataAccess.Client.OracleConnection(connectionString))
    using (var command = connection.CreateCommand())
    {
        // we need for 60 seconds timeout
        command.CommandTimeout = 60; //default value is 0 (unlimited)
        //here can be any query that takes longer time than specified in CommandTimeout
        command.CommandText = "execute DBMS_LOCK.sleep(70)";
        connection.Open();
        //this statement will never return control
        command.ExecuteNonQuery();
        //BUG:connection and command never be disposed and test will be fail after timeout
    }
}

让我们看看内部驱动程序。查找功能:

internal void ReceiveExecuteResponse

该函数处理异常(ORA 03111)并在此处调用 Reset():

catch (NetworkException ex)
{
    if (ex.ErrorCode != 3111)
        throw;
    else
        this.m_marshallingEngine.m_oracleCommunication.Reset();
}

在将 URG 数据包发送到 Oracle 数据库并读取应答功能后，将进入永不结束的循环:

while (!flag1)
    {

函数尝试读取响应流，直到 AppDomain 被卸载。 在修复此错误之前，我们无法使用托管驱动程序。非托管 x64 驱动程序成功通过此测试。

Answer 1

很明显，OP 不小心使用了 MS OracleClient。它确实适用于 ODP.NET。

工作示例:

public static void OracleCommandTimeoutTest()
{
  System.Diagnostics.Stopwatch sw = new System.Diagnostics.Stopwatch();
  try
  {
    const string connectionString = @"user id=scott;password=tiger;data source=inst1";
    using (var connection = new OracleConnection(connectionString))
    using (var command = connection.CreateCommand())
    {
      // we need for 60 seconds timeout
      command.CommandTimeout = 20; //default value is 0 (unlimited)

      //here can be any query that takes longer time than specified in CommandTimeout
      command.CommandText = "BEGIN DBMS_LOCK.sleep(70); END;";
      connection.Open();

      //this statement will never return control
      sw.Start();
      command.ExecuteNonQuery();
      sw.Stop();

      Console.WriteLine("ExecuteNonQuery Completed (Didn't timeout): " + sw.Elapsed + " ms");
      //BUG:connection and command never be disposed and test will be fail after timeout
    }
  }
  catch (Exception ex)
  {
    sw.Stop();

    Console.WriteLine();
    Console.WriteLine("Timed-Out after: " + sw.Elapsed + " ms");
    Console.WriteLine(ex.Message);
  }
}

上面的测试用例给出了以下结果:

超时时间:00:00:21.0581601 毫秒 ORA-01013: 用户请求取消当前操作