MYSQL 如何跟踪 mysql 跟踪工具

简介

之前的工作一直使用的SQL SERVER, 用过的都知道，SQL SERVER有配套的SQL跟踪工具SQL Profiler，开发或者定位BUG过程中，可以在操作页面的时候，实时查看数据库执行的SQL语句，十分方便。最近的项目使用MySQL，没有类似的功能，感觉到十分的不爽，网上也没有找到合适的免费工具，所以自己研究做了一个简单工具。

功能

实时查询MySql执行的SQL语句

查看性能异常的SQL(执行超过2秒)

技术方案

前端vue，样式bootstrap

后台dotnet core mvc

先看一下的效果：

实现原理

Mysql支持输出日志，通过以下命令查看当前状态

show VARIABLES like '%general_log%' //是否开启输出所有日志

show VARIABLES like '%slow_query_log%' //是否开启慢SQL日志

show VARIABLES like '%log_output%' //查看日志输出方式(默认file，还支持table)

show VARIABLES like '%long_query_time%' //查看多少秒定义为慢SQL

下面我们将所有日志、慢SQL日志打开，日志输出修改为table，定义执行2秒以上的为慢SQL

set global log_output='table' //日志输出到table(默认file)

set global general_log=on; //打开输出所有日志

set global slow_query_log=on; //打开慢SQL日志

set global long_query_time=2 //设置2秒以上为慢查询

repair table mysql.general_log //修复日志表(如果general_log表报错的情况下执行)

注意：以上的设置，数据库重启后将失效，永久改变配置需要修改my.conf文件

现在日志文件都存在数据库表里面了，剩下的工作就是取数并展示出来就行了。本项目后台使用的MVC取数，然后VUE动态绑定，Bootstrap渲染样式。

前端代码

开发工具

• SQL跟踪
• 性能异常SQL

---

---

时间执行语句

{{log.time}}
@**@
{{log.sql}}

执行时长(时：分：秒，毫秒)锁定时长(时：分：秒，毫秒)开始时间数据库操作者执行语句

{{query.queryTime}}
@**@
{{query.lockTime }}
{{query.startTime }}
{{query.db }}
{{query.userHost}}
{{query.sql}}
 
 
new Vue({
el: '#app',
data: {
startShow: true,
pauseShow: false,
clearShow: true,
logs: [],
slowQuerys: []
},
methods: {
start: function () {
this.timer = setInterval(this.trace, 5000);
this.pauseShow = true;
this.startShow = false;
},
pause: function () {
clearInterval(this.timer);
this.pauseShow = false;
this.startShow = true;
},
clear: function () {
this.logs = null;
},
trace: function () {
//发送 post 请求
this.$http.post('/home/start', {}, { emulateJSON: true }).then(function (res) {
this.logs = res.body;
}, function (res) {
console.log(logs);
});
}
},
created: function () {
},
mounted: function () {
this.$http.post('/home/slow', {}, { emulateJSON: true }).then(function (res) {
this.slowQuerys = res.body;
}, function (res) {
console.log(this.slowQuerys);
});
},
destroyed: function () {
clearInterval(this.time)
}
});
后端代码
using Ade.Tools.Models;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
using MySql.Data.MySqlClient;
using Microsoft.Extensions.Caching.Memory;
namespace Ade.Tools.Controllers
{
public class HomeController : Controller
{
public IConfiguration Configuration { get; set; }
public HomeController(IConfiguration configuration)
{
this.Configuration = configuration;
this.ConnStr = Configuration["Sql:DefaultConnection"];
}
public static DateTime StartTime { get; set; } = DateTime.MinValue;
public static List TableNames { get; set; }
public string ConnStr { get; set; }
public JsonResult Start()
{
if (StartTime == DateTime.MinValue)
{
StartTime = DateTime.Now;
}
int size = int.Parse(Configuration["Size"]);
string[] blackList = Configuration["Blacklist"].Split(",");
List tableNames = GetTableNames();
List logItems = new List();
List logItemDTOs = new List();
using (MySqlConnection mySqlConnection = new MySqlConnection(this.ConnStr))
{
//string sqlStart = "set global log_output='table';set global general_log=on; repair table mysql.general_log;";
//Dapper.SqlMapper.Execute(mySqlConnection, sqlStart);
logItemDTOs = Dapper.SqlMapper.Query(mySqlConnection, $" select * from mysql.general_log " +
$"where event_time>'{StartTime.ToString("yyyy-MM-dd HH:mm:ss")}' " +
$"order by event_time desc ")
//+ $"limit {size} "
.ToList();
}
logItemDTOs.ForEach(e =>
{
LogItem logItem = new LogItem()
{
Time = e.event_time.ToString("yyyy-MM-dd HH:mm:ss.fff"),
CommondType = e.command_type,
ServerId = e.server_id,
ThreadId = e.thread_id,
UserHost = e.user_host,
Sql = System.Text.Encoding.Default.GetString(e.argument)
};
if (tableNames.Any(a => logItem.Sql.Contains(a))
&& !blackList.Any(b => logItem.Sql.Contains(b))
)
{
logItems.Add(logItem);
}
});
return new JsonResult(logItems);
}
public JsonResult Slow()
{
List slowQueries = new List();
using (MySqlConnection mySqlConnection = new MySqlConnection(this.ConnStr))
{
string sql = "select * from mysql.slow_log order by query_time desc";
List slowDtos = Dapper.SqlMapper.Query(mySqlConnection, sql).ToList();
slowDtos.ForEach(e => {
slowQueries.Add(new SlowQuery()
{
DB = e.db,
LockTime = DateTime.Parse(e.lock_time.ToString()).ToString("HH:mm:ss.fffff"),
QueryTime = DateTime.Parse(e.query_time.ToString()).ToString("HH:mm:ss.fffff"),
RowsExamined = e.rows_examined,
RowsSent = e.rows_sent,
Sql = System.Text.Encoding.Default.GetString( (byte[])e.sql_text),
StartTime = e.start_time.ToString("yyyy-MM-dd HH:mm:ss"),
UserHost = e.user_host
});
});
}
return new JsonResult(slowQueries);
}
public string On()
{
using (MySqlConnection mySqlConnection = new MySqlConnection(this.ConnStr))
{
string sql = "set global log_output='table';set global general_log=on; repair table mysql.general_log;";
Dapper.SqlMapper.Execute(mySqlConnection, sql);
}
return "ok";
}
public string Off()
{
using (MySqlConnection mySqlConnection = new MySqlConnection(this.ConnStr))
{
string sql = "set global general_log=off;";
Dapper.SqlMapper.Execute(mySqlConnection, sql);
}
return "ok";
}
public string Clear()
{
using (MySqlConnection mySqlConnection = new MySqlConnection(this.ConnStr))
{
string sql = $@"
SET GLOBAL general_log = 'OFF';
RENAME TABLE general_log TO general_log_temp;
DELETE FROM `general_log_temp`;
RENAME TABLE general_log_temp TO general_log;
SET GLOBAL general_log = 'ON';
";
Dapper.SqlMapper.Execute(mySqlConnection, sql);
}
return "ok";
}
public IActionResult Index()
{
return View();
}
private List GetTableNames()
{
MemoryCache memoryCache = new MemoryCache(new MemoryCacheOptions());
var cacheKey = "MySqlProfile_TableNames";
List tableNames = memoryCache.Get >(cacheKey);
if (tableNames != null)
{
return tableNames;
}
string[] traceDbs = Configuration["TraceDatabaseNames"].Split(",");
string sqlTables = "SELECT distinct TABLE_NAME FROM information_schema.columns";
foreach (var db in traceDbs)
{
if (!sqlTables.Contains("WHERE"))
{
sqlTables += " WHERE table_schema='" + db + "'";
}
else
{
sqlTables += " OR table_schema='" + db + "'";
}
}
using (MySqlConnection mySqlConnection = new MySqlConnection(this.ConnStr))
{
// WHERE table_schema='mice'
tableNames = Dapper.SqlMapper.Query(mySqlConnection, sqlTables).ToList();
}
memoryCache.Set(cacheKey, tableNames, TimeSpan.FromMinutes(30));
return tableNames;
}
}
}

源代码

修改完appsettings.json文件里面的连接字符串以及其他配置(详情自己看注释，懒得写了)，就可以使用了。

https://github.com/holdengong/MysqlProfiler

最后一点

开启日志会产生大量的文件，需要注意定时清理

SET GLOBAL general_log = 'OFF'; // 关闭日志
RENAME TABLE general_log TO general_log_temp; //表重命名
DELETE FROM general_log_temp; //删除所有数据
RENAME TABLE general_log_temp TO general_log; //重命名回来
SET GLOBAL general_log = 'ON'; //开启日志