diff --git a/第四章：数据库日志管理.md b/第四章：数据库日志管理.md
deleted file mode 100644
index 974d4e0..0000000
--- a/第四章：数据库日志管理.md
+++ /dev/null
@@ -1,135 +0,0 @@
-<h1><center>数据库日志管理</center></h1>
-
-**作者：行癫（盗版必究）**
-
-------
-
-## 一：日志管理
-
-<img src="https://xingdian-image.oss-cn-beijing.aliyuncs.com/xingdian-image/image-20220925214046253.png" alt="image-20220925214046253" style="zoom:50%;" />
-
-#### 1.日志分类
-
-​		错误日志 ：启动，停止，关闭失败报错。rpm安装日志位置 /var/log/mysqld.log
-
-​		通用查询日志：所有的查询都记下来
-
-​		二进制日志：实现备份，增量备份。只记录改变数据，除了select都记
-
-​		中继日志：读取主服务器的binlog，在本地回放。保持一致
-
-​		slow log：慢查询日志，指导调优，定义某一个查询语句，定义超时时间，通过日志提供调优建议给开发人员
-
-​		DDL log： 定义语句的日志
-
-#### 2.Error Log
-
-```shell
-log-error=/var/log/mysqld.log
-```
-
-#### 3.Binary Log
-
-```
-log-bin=/var/log/mysql-bin/slave2
-server-id=2
-
-[root@slave2 ~]# mkdir /var/log/mysql-bin
-[root@slave2 ~]# chown mysql.mysql /var/log/mysql-bin/
-[root@slave2 ~]# systemctl restart mysqld
-```
-
-注意：
-
-​		需要提前开启
-
-查看binlog日志：
-
-```shel
-[root@slave2 ~]# mysqlbinlog slave2-bin.000001     -v --base64-output=decode-rows
-        时间点  ：  141126 14:04:49
-        位置点  :     at  106
-注：
-1. 重启mysqld 会截断
-2. flush logs 会截断
-3. reset master 删除所有binlog    rm -rf /var/lib/mysql/*.000001
-4. 删除部分
-PURGE BINARY LOGS TO 'mysql-bin.010';
-PURGE BINARY LOGS BEFORE '2019-04-02 22:46:26';
-
-截取binlog
-all：
-# mysqlbinlog mysql.000002
-
-datetime：
-# mysqlbinlog mysql.000002 --start-datetime="2018-12-05 10:02:56"
-# mysqlbinlog mysql.000002 --stop-datetime="2018-12-05 11:02:54"
-# mysqlbinlog mysql.000002 --start-datetime="2018-12-05 10:02:56" --stop-datetime="2018-12-05 11:02:54" 
- 
-position：
-# mysqlbinlog mysql.000002 --start-position=260
-# mysqlbinlog mysql.000002 --stop-position=260
-# mysqlbinlog mysql.000002 --start-position=260 --stop-position=930
-```
-
-#### 4.Slow Query Log
-
-开启慢查询日志：
-
-```shell
-[root@xingdian ~]# vim /etc/my.cnf
-slow_query_log=1
-slow_query_log_file=/var/log/mysql-slow/slow.log
-long_query_time=3   设置慢查询超时时间  单位是：秒
-```
-
-创建对应目录：
-
-```shell
-[root@xingdian ~]# mkdir /var/log/mysql-slow
-[root@xingdian ~]# chown mysql.mysql mysql-slow
-```
-
-重启服务：
-
-```shell
-[root@xingdian ~]# systemctl restart mysqld
-```
-
-验证：
-
-```shell
-[root@xingdian ~]# mysql -uroot -pQianFeng@123
-mysql: [Warning] Using a password on the command line interface can be insecure.
-Welcome to the MySQL monitor.  Commands end with ; or \g.
-Your MySQL connection id is 2
-Server version: 5.7.39-log MySQL Community Server (GPL)
-
-Copyright (c) 2000, 2022, Oracle and/or its affiliates.
-
-Oracle is a registered trademark of Oracle Corporation and/or its
-affiliates. Other names may be trademarks of their respective
-owners.
-
-Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
-
-mysql> select sleep(6); 
-+----------+
-| sleep(6) |
-+----------+
-|        0 |
-+----------+
-1 row in set (6.00 sec)
-
-mysql> exit
-Bye
-[root@xingdian ~]# cat /var/log/mysql-slow/slow.log 
-/usr/sbin/mysqld, Version: 5.7.39-log (MySQL Community Server (GPL)). started with:
-Tcp port: 0  Unix socket: /var/lib/mysql/mysql.sock
-Time                 Id Command    Argument
-# Time: 2022-09-25T06:58:05.496205Z
-# User@Host: root[root] @ localhost []  Id:     2
-# Query_time: 6.007094  Lock_time: 0.000000 Rows_sent: 1  Rows_examined: 0
-SET timestamp=1664089085;
-select sleep(6);
-```