目录

72.1. Reset root password 重置MySQL root密码72.2. 数据库内容替换72.3. 查看错误代码

72.3.1. ERROR 1153 (08S01) at line 3168: Got a packet bigger than 'max_allowed_packet' bytes72.3.2. ERROR 1129 (00000): Host 'XXXXXX' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'

72.4. 临时表是否需要建索引72.5. Kill 脚本72.6. ERROR 1503 (HY000): A PRIMARY KEY must include all columns in the table's partitioning function72.7. ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.72.8. ERROR 1819 (HY000): Your password does not satisfy the current policy requirements72.9. 重新整理AUTO_INCREMENT字段72.10. 转换 latin1 到 UTF-872.11. this is incompatible with sql_mode=only_full_group_by72.12. [Warning] Changed limits: max_open_files: 5000 (requested 20480)72.13. ERROR 1364: 1364: Field 'id' doesn't have a default value72.14. ERROR 1290 (HY000): The MySQL server is running with the --secure-file-priv option so it cannot execute this statement72.15. ERROR 1086 (HY000): File '/var/lib/mysql-files/order.txt' already exists 72.16. ERROR 1415: Not allowed to return a result set from a trigger

忘记root密码是使用 --skip-grant-tables 启动项

CentOS 6.x

# vim /etc/init.d/mysqld$exec --skip-grant-tables  --datadir="$datadir" --socket="$socketfile" \--pid-file="$mypidfile" \--basedir=/usr --user=mysql >/dev/null 2>&1 &

# /etc/init.d/mysqld restart
Stopping mysqld:                                           [  OK  ]
Starting mysqld:                                           [  OK  ]# mysqladmin -u root flush-privileges password "newpassword"

CentOS 7.x

添加 skip-grant-tables=1 选项，然后重启mysql

# cat /etc/my.cnf
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html[mysqld]
#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
#
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
skip-grant-tables=1
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0# Recommended in standard MySQL setup
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES [mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

# systemctl restart mysqld

update mysql.user set authentication_string=password('netkiller') where user='root' and Host = 'localhost';
flush privileges;
quit;

# mysql
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.14 MySQL Community Server (GPL)Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.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> update mysql.user set authentication_string=password('netkiller') where user='root' and Host = 'localhost';
Query OK, 1 row affected, 1 warning (0.03 sec)
Rows matched: 1  Changed: 1  Warnings: 1mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)mysql> quit;
Bye

删除 skip-grant-tables=1 重启MySQL