第 72 章 FAQ-白红宇

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' bytes

72.3.2. 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 function

72.7. 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 requirements

72.9. 重新整理AUTO_INCREMENT字段

72.10. 转换 latin1 到 UTF-8

72.11. this is incompatible with sql_mode=only_full_group_by

72.12. [Warning] Changed limits: max_open_files: 5000 (requested 20480)

72.13. ERROR 1364: 1364: Field 'id' doesn't have a default value

72.14. ERROR 1290 (HY000): The MySQL server is running with the --secure-file-priv option so it cannot execute this statement

72.15. 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

72.1. Reset root password 重置MySQL root密码

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 restartStopping 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 = 2Mdatadir=/var/lib/mysqlsocket=/var/lib/mysql/mysql.sockskip-grant-tables=1# Disabling symbolic-links is recommended to prevent assorted security riskssymbolic-links=0# Recommended in standard MySQL setupsql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES [mysqld_safe]log-error=/var/log/mysqld.logpid-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;

# mysqlWelcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 2Server 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 itsaffiliates. Other names may be trademarks of their respectiveowners.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

原文出处：Netkiller 系列手札

本文作者：陈景峯

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