SQLServer监控阻塞会话的方法
作者：Eric zhou
这篇文章主要介绍了SQLServer如何监控阻塞会话,通过实例代码介绍了查询阻塞和被阻塞的会话,本文结合实例代码给大家介绍的非常详细,需要的朋友参考下吧
一、查询阻塞和被阻塞的会话
SELECT
r.session_id AS [Blocked Session ID],
r.blocking_session_id AS [Blocking Session ID],
r.wait_type,
r.wait_time,
r.wait_resource,
s1.program_name AS [Blocked Program Name],
s1.login_name AS [Blocked Login],
s2.program_name AS [Blocking Program Name],
s2.login_name AS [Blocking Login],
r.text AS [SQL Text]
FROM sys.dm_exec_requests AS r
LEFT JOIN sys.dm_exec_sessions AS s1 ON r.session_id = s1.session_id
LEFT JOIN sys.dm_exec_sessions AS s2 ON r.blocking_session_id = s2.session_id
CROSS APPLY sys.dm_exec_sql_text(r.sql_handle) AS r
WHERE r.blocking_session_id <> 0;二、找出阻塞的具体SQL
SELECT
r.session_id,
r.blocking_session_id,
t.text AS [SQL Text],
r.wait_type,
r.wait_time,
r.wait_resource
FROM sys.dm_exec_requests AS r
CROSS APPLY sys.dm_exec_sql_text(r.sql_handle) AS t
WHERE r.blocking_session_id <> 0;三、编写C#程序，每隔10秒监控SQL Server数据库中的阻塞会话，定位出阻塞的根源会话并终止它们，同时记录日志。
using System;
using System.Data.SqlClient;
using System.IO;
using System.Timers;
class Program
{
private static Timer timer;
private static string connectionString = "your_connection_string_here";
static void Main(string[] args)
{
timer = new Timer(10000); // 每10秒执行一次
timer.Elapsed += CheckForBlockingSessions;
timer.AutoReset = true;
timer.Enabled = true;
Console.WriteLine("Press [Enter] to exit the program.");
Console.ReadLine();
}
private static void CheckForBlockingSessions(object source, ElapsedEventArgs e)
{
try
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();
string query = @"
SELECT
r.session_id AS BlockedSessionID,
r.blocking_session_id AS BlockingSessionID,
r.text AS SqlText
FROM sys.dm_exec_requests AS r
CROSS APPLY sys.dm_exec_sql_text(r.sql_handle) AS r
WHERE r.blocking_session_id <> 0;";
using (SqlCommand command = new SqlCommand(query, connection))
{
using (SqlDataReader reader = command.ExecuteReader())
{
while (reader.Read())
{
int blockedSessionId = reader.GetInt32(0);
int blockingSessionId = reader.GetInt32(1);
string sqlText = reader.GetString(2);
LogBlockingSession(blockedSessionId, blockingSessionId, sqlText);
KillSession(blockingSessionId);
}
}
}
}
}
catch (Exception ex)
{
LogError(ex.Message);
}
}
private static void KillSession(int sessionId)
{
try
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();
string killQuery = $"KILL {sessionId};";
using (SqlCommand killCommand = new SqlCommand(killQuery, connection))
{
killCommand.ExecuteNonQuery();
LogKillSession(sessionId);
}
}
}
catch (Exception ex)
{
LogError($"Failed to kill session {sessionId}: {ex.Message}");
}
}
private static void LogBlockingSession(int blockedSessionId, int blockingSessionId, string sqlText)
{
string logMessage = $"[{DateTime.Now}] Blocked Session ID: {blockedSessionId}, Blocking Session ID: {blockingSessionId}, SQL Text: {sqlText}";
File.AppendAllText("blocking_sessions.log", logMessage + Environment.NewLine);
Console.WriteLine(logMessage);
}
private static void LogKillSession(int sessionId)
{
string logMessage = $"[{DateTime.Now}] Killed Session ID: {sessionId}";
File.AppendAllText("killed_sessions.log", logMessage + Environment.NewLine);
Console.WriteLine(logMessage);
}
private static void LogError(string message)
{
string logMessage = $"[{DateTime.Now}] Error: {message}";
File.AppendAllText("errors.log", logMessage + Environment.NewLine);
Console.WriteLine(logMessage);
}
}说明
- 连接字符串：替换
your_connection_string_here为实际的数据库连接字符串。 - 定时器：使用
System.Timers.Timer类设置每10秒执行一次检查。 - 检查阻塞会话：在
CheckForBlockingSessions方法中，查询阻塞会话和根源会话的信息。 - 终止会话：在
KillSession方法中，执行KILL命令来终止阻塞会话。 - 日志记录：日志记录包括阻塞会话的详细信息和终止会话的操作，以及错误信息。
注意事项
- 运行此程序需要确保有足够的权限来访问数据库和执行
KILL命令。 - 请仔细测试程序以确保其符合预期行为，尤其是在生产环境中。
- 日志文件的路径和权限需要根据实际情况进行配置。
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