Question

我有一个数据库，我正在尝试更新行值，但我得到一个＆＃34;锁定等待超时＆＃34;错误。这就是表格的样子：

mysql> use rti;
Database changed
mysql> explain resin_products;
+--------------------+--------------+------+-----+---------+-------+
| Field              | Type         | Null | Key | Default | Extra |
+--------------------+--------------+------+-----+---------+-------+
| resin_product_id   | int(11)      | NO   | PRI | NULL    |       |
| manufacturer       | varchar(45)  | YES  |     | NULL    |       |
| name               | varchar(45)  | YES  |     | NULL    |       |
| model_number       | varchar(45)  | YES  |     | NULL    |       |
| resin_type         | varchar(45)  | YES  |     | NULL    |       |
| primary_type       | varchar(45)  | YES  |     | NULL    |       |
| group              | varchar(45)  | YES  |     | NULL    |       |
| teir               | varchar(45)  | YES  |     | NULL    |       |
| chemical_structure | varchar(45)  | YES  |     | NULL    |       |
| physical_structure | varchar(45)  | YES  |     | NULL    |       |
| color              | varchar(45)  | YES  |     | NULL    |       |
| total_capacity     | varchar(45)  | YES  |     | NULL    |       |
| salt_split_CAP     | varchar(45)  | YES  |     | NULL    |       |
| price_per_cuft     | varchar(45)  | YES  |     | NULL    |       |
| comments           | varchar(500) | YES  |     | NULL    |       |
+--------------------+--------------+------+-----+---------+-------+

这是命令：

mysql> UPDATE resin_products SET price_per_cuft='00.04' WHERE resin_product_id=1;

这是大约30秒后发生的错误：

ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction

这就是我的＆＃34; lock_wait＆＃34;变量设置为：

mysql> show variables like 'lock_wait_timeout';
+-------------------+----------+
| Variable_name     | Value    |
+-------------------+----------+
| lock_wait_timeout | 31536000 |
+-------------------+----------+
1 row in set (0.00 sec)

Answer 1

首先查看锁定表的列表：

public static List<ErrorLogData> GetLogErrorData(string appName, InputData data)
{
    SqlConnection con;
    List<ErrorLogData> errorLogData = null;
    string query = "";
    if (data.DateFrom == "" && data.DateTo == "")
    {
        query += "from ld in logData.errorLogs.Take(10000)";
    }

    if (data.DateFrom == "" && data.DateTo != "")
    {
        query += "from ld in logData.errorLogs where ld.errorTime <= " + data.DateTo;
    }

    if (data.DateFrom != "" && data.DateTo == "")
    {
        query += "from ld in logData.errorLogs where ld.errorTime >= " + data.DateFrom + " && <= " + DateTime.Now;
    }

    if (data.DateFrom != "" && data.DateTo != "")
    {
        query += "from ld in logData.errorLogs where ld.errorTime >= " + data.DateFrom + " && <= " + data.DateTo;
    }

    DateTime dateFrom = Convert.ToDateTime(data.DateFrom);
    DateTime dateTo = Convert.ToDateTime(data.DateTo);


    using (con = new SqlConnection(ConfigurationManager.AppSettings[conKey]))
    using (WebEntities logData = new WebEntities())
    {
        logData.CommandTimeout = 300;
        var errorLog = query + 
                       select new ErrorLogData
                       {
                           ErrorID = ld.errorID,
                           ErrorTime = ld.errorTime,
                           UserName = ld.username,
                           ErrorType = ld.errorType,
                           Error = ld.error,
                           ControlNumber = ld.controlNumber
                       };
        errorLogData = errorLog.ToList();
    }
    return errorLogData;
}

你也可以看到使用这个表的线程：

query

然后你可以杀死那个线程

select new ErrorLogData...

为什么我超过＆＃34;锁定等待超时＆＃34;尝试更新MySQL条目时出错？

1 个答案: