MySQL8.0的工具日志配置管理方式

配置：
默认位置：
log_error=$DATDDIR/hostname.err
看日志： 主要关注 [ERROR],deadlock
[root@localhost ~]# # errorlog
[root@localhost ~]# # 默认开了，默认位置 datadir=/data/3306/data/HOSTNAME.err
[root@localhost ~]# # 控制参数 log_error=/data/3306/err.log, 注意： 最好是初始化之前设定好。
[root@localhost ~]# # 注意： 日志和数据分开存储 例如： /mysqllog/3306/mysql-err.log
[root@localhost ~]# vim /etc/my.cnf
[root@localhost ~]# cat /etc/my.cnf
[mysql]
socket=/tmp/mysql.sock
[mysqld]
user=mysql
basedir=/usr/local/mysql
datadir=/data/3306/data
server_id=51
port=3306
socket=/tmp/mysql.sock
log_error=/data/3306/log/mysql-err.log

[root@localhost ~]# mkdir -p /data/3306/log/
[root@localhost ~]# chown -R mysql.mysql /data/
[root@localhost ~]# /etc/init.d/mysqld restart
Shutting down MySQL.... [ OK ]
Starting MySQL.2021-11-20T14:58:53.264890Z mysqld_safe error: log-error set to
'/data/3306/log/mysql-err.log', however file don't exists. Create writable for
user 'mysql'.
The server quit without updating PID file
(/data/3306/data/[FAILED]t.localdomain.pid).
[root@localhost ~]# touch /data/3306/log/mysql-err.log
[root@localhost ~]# chown -R mysql. /data/
[root@localhost ~]# /etc/init.d/mysqld restart
错误日志：
启动故障
主从故障
死锁
数据库hang，堆栈信息
主要关注： [ERROR]
[ERROR] [MY-000068] [Server] unknown option ---》 配置文件有问题
日志记录级别
mysql> show variables like '%log_error%';
+----------------------------+----------------------------------------+
| Variable_name | Value |
+----------------------------+----------------------------------------+
| binlog_error_action | ABORT_SERVER |
| log_error | /data/3306/log/mysql-err.log |
| log_error_services | log_filter_internal; log_sink_internal |
| log_error_suppression_list | |
| log_error_verbosity | 2 |
+----------------------------+----------------------------------------+
5 rows in set (0.00 sec)

 cat /etc/my.cnf
[mysql]
socket=/tmp/mysql.sock
[mysqld]
user=mysql
basedir=/usr/local/mysql
datadir=/data/3306/data
server_id=51
port=3306
socket=/tmp/mysql.sock
log_error=/data/3306/log/mysql-err.log
log_bin=/data/3306/log/mysql-bin

cd /data/3306/log/
[root@localhost log]# ll
total 24
-rw-r----- 1 mysql mysql 156 Nov 20 23:26 mysql-bin.000001
-rw-r----- 1 mysql mysql 32 Nov 20 23:26 mysql-bin.index

开关：
slow_query_log=1
slow_query_log_file=
维度：
set global slow_query_log=1
set global long_query_time=0.5
set global log_queries_not_using_indexes=1
set global log_throttle_queries_not_using_indexes=1000;

[root@localhost ~]# # 普通日志 general_log
[root@localhost ~]# # 文本格式记录MySQL运行期间，所有的所作语句， 可以做问题诊断和调试
[root@localhost ~]# # 参数： general_log , general_log_file
[root@localhost ~]# vim /etc/my.cnf
[root@localhost ~]# cat /etc/my.cnf
[mysql]
socket=/tmp/mysql.sock
[mysqld]
user=mysql
basedir=/usr/local/mysql
datadir=/data/3306/data
server_id=51
port=3306
socket=/tmp/mysql.sock
log_error=/data/3306/log/mysql-err.log
log_bin=/data/3306/log/mysql-bin
slow_query_log=1
slow_query_log_file=/data/3306/log/slow.log
long_query_time=0.5
log_queries_not_using_indexes=1
log_throttle_queries_not_using_indexes=1000
general_log=on
general_log_file=/data/3306/log/genlog