Question

我试图创建一个简单的函数，我可以调用它来通过mysqldump.exe转储MySql数据库。这些函数有效，它会转储数据库，但速度非常慢。当我通过MySQL Workbench运行数据导出时，它将在1秒内导出数据库（最长为4），文件小于14MB。但是，通过我的功能，只需不到14分钟即可完成相同的转储。根据Workbench，数据库在我的本地，只有31MiB（测试数据库）。

我通过创建新的mysqldump.exe并将System.Diagnostics.Process附加到System.Diagnostics.DataReceivedEventHandler事件来致电OutputDataReceived。我也重定向了任何错误，但没有任何错误。

以下是我传递给mysqldump.exe的论据：

String.Format("-h {0} -u {1} -p{2} --port=3306 --max_allowed_packet=1G --no-create-info=TRUE --no-create-db --databases {3}", host, user, pswd, schemaName);

这是完整的功能：

    StreamWriter _outputStream;

    private void OnDataReceived(object sender, System.Diagnostics.DataReceivedEventArgs e)
    {
        if (e.Data != null) _outputStream.WriteLine(e.Data);
    }

    void OnErrorReceived(object sender, System.Diagnostics.DataReceivedEventArgs e)
    {
        Console.WriteLine(e.Data);
    }

    private void CreateBackup(string schemaName)
    {
        string mysqldumpPath = @"C:\Program Files\MySQL\MySQL Workbench 6.2 CE\mysqldump.exe";
        string host = "127.0.0.1";
        string user = "username";
        string pswd = "password";

        string cmd = String.Format("-h {0} -u {1} -p{2} --port=3306 --max_allowed_packet=1G --no-create-info=TRUE --no-create-db --databases {3}", host, user, pswd, schemaName);
        string dumpPath = ConfigurationManager.AppSettings["BackupLocation"] + String.Format("\\{0}_{1}_{2}_{3}.sql", 
                                                                                schemaName, DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day);

        _outputStream = new StreamWriter(dumpPath);

        System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo();
        startInfo.FileName = mysqldumpPath;
        startInfo.Arguments = cmd;
        startInfo.RedirectStandardError = true;
        startInfo.RedirectStandardInput = false;
        startInfo.RedirectStandardOutput = true;
        startInfo.UseShellExecute = false;
        startInfo.CreateNoWindow = true;
        startInfo.ErrorDialog = false;

        System.Diagnostics.Process proc = new System.Diagnostics.Process();
        proc.StartInfo = startInfo;
        proc.OutputDataReceived += new System.Diagnostics.DataReceivedEventHandler(OnDataReceived);
        proc.ErrorDataReceived += new System.Diagnostics.DataReceivedEventHandler(OnErrorReceived);

        proc.Start();

        proc.BeginOutputReadLine();
        proc.BeginErrorReadLine();

        proc.WaitForExit();

        _outputStream.Flush();
        _outputStream.Close();

        proc.Close();
        _outputStream = null;
    }

我应该做些什么，或者可以做些什么，这会有助于它更快地运行？

MySqlDump进程很慢

0 个答案: