mysql故障案例 mysql故障案例

2021-10-18 12:36:44 字數 3228 閱讀 1172

mysql> create database dede;

error 2006 (hy000): mysql server has gone away

no connection. trying to reconnect...

connection id: 47299

current database: none

query ok, 1 row affected (0.00 sec)

mysql> grant all privileges on dede.* to 『dede『@『localhost『 identified by 『dede123『; ##授權時執行失敗

error 2006 (hy000): mysql server has gone away

no connection. trying to reconnect...

connection id: 47302

current database: none

error 1044 (42000): access denied for user 『root『@『%『 to database 『dede『 ##拒絕訪問的使用者

解決:mysql> select grant_priv from mysql.user where host=『localhost『; ##n代表沒有許可權

| grant_priv |

| n |

| n |

| n |

3 rows in set (0.00 sec)

mysql> select grant_priv from mysql.user where host=『127.0.0.1『;

| grant_priv |

| y |

1 row in set (0.00 sec)

mysql> update mysql.user set grant_priv=『y『 where host=『localhost『;

error 2006 (hy000): mysql server has gone away

no connection. trying to reconnect...

connection id: 47312

current database: none

query ok, 3 rows affected (0.01 sec)

rows matched: 3 changed: 3 warnings: 0

mysql> select grant_priv from mysql.user where host=『localhost『;

| grant_priv |

| y |

| y |

| y |

3 rows in set (0.00 sec)

mysql> flush privileges;

query ok, 0 rows affected (0.00 sec)

mysql> grant all privileges on dede.* to 『dede『@『localhost『 identified by 『dede123『;

error 1044 (42000): access denied for user 『root『@『%『 to database 『dede『

mysql> show variables like 『read_only『

error 2006 (hy000): mysql server has gone away

no connection. trying to reconnect...

connection id: 47323

current database: none

| variable_name | value |

| read_only | off |

1 row in set (0.00 sec)

mysql> show global variables like 『max_allowed_packet『; ##檢視max_allowed_packet的值,預設是1mb

error 2006 (hy000): mysql server has gone away

no connection. trying to reconnect...

connection id: 47339

current database: none

| variable_name | value |

| max_allowed_packet | 1048576 |

1 row in set (0.00 sec)

mysql> set global max_allowed_packet=1024102416; ##臨時修改max_allowed_packet值為16mb,重啟失效

error 2006 (hy000): mysql server has gone away

no connection. trying to reconnect...

connection id: 47341

current database: none

query ok, 0 rows affected (0.00 sec)

mysql> show global variables like 『max_allowed_packet『; ##檢視.,臨時已生效

| variable_name | value |

| max_allowed_packet | 16777216 |

1 row in set (0.00 sec)

mysql> grant all privileges on dede.* to 『dede『@『localhost『 identified by 『dede123『; ###grant授權使用者成功

error 2006 (hy000): mysql server has gone away

no connection. trying to reconnect...

connection id: 47347

current database: none

query ok, 0 rows affected (0.00 sec)

mysql> exit

bye###永久修改引數

[[email protected] ~]# vim /etc/my.cnf

[mysqld]

max_allowed_packet = 16m

mysql 重啟生效

原文:

mysql 故障案例 mysql故障案例

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