分类：未分类

一、启动mysql（mariadb）报错

（注：后文中mysql==mariadb）：

二、查看mysql日志：

vim /var/log/mariadb/mariadb.log

InnoDB: End of page dump

160226 11:00:21  InnoDB: Page checksum 913642282 (32bit_calc: 472052024), prior-to-4.0.14-form checksum 2048873750
InnoDB: stored checksum 913642282, prior-to-4.0.14-form stored checksum 1622372148
InnoDB: Page lsn 0 142354744, low 4 bytes of lsn at page end 142348560
InnoDB: Page number (if stored to page already) 589,
InnoDB: space id (if created with >= MySQL-4.1.1 and stored already) 0
InnoDB: Page may be an update undo log page
InnoDB: Database page corruption on disk or a failed
InnoDB: file read of page 589.
InnoDB: You may have to recover from a backup.
InnoDB: It is also possible that your operating
InnoDB: system has corrupted its own file cache
InnoDB: and rebooting your computer removes the
InnoDB: error.
InnoDB: If the corrupt page is an index page
InnoDB: you can also try to fix the corruption
InnoDB: by dumping, dropping, and reimporting
InnoDB: the corrupt table. You can use CHECK
InnoDB: TABLE to scan your table for corruption.
InnoDB: See also  http://dev.mysql.com/doc/refman/5.5/en/forcing-innodb-recovery.html
InnoDB: about forcing recovery.
160226 11:00:21 [ERROR] mysqld got signal 6 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.

To report this bug, see  http://kb.askmonty.org/en/reporting-bugs

We will try our best to scrape up some info that will hopefully help
diagnose the problem, but since we have already crashed,
something is definitely wrong and this may fail.

Server version: 5.5.44-MariaDB
key_buffer_size=134217728
read_buffer_size=131072
max_used_connections=0
max_threads=153
thread_count=0
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 466713 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0x0
Attempting backtrace. You can use the following information to find out
InnoDB: End of page dump
160226 11:00:30  InnoDB: Page checksum 913642282 (32bit_calc: 472052024), prior-to-4.0.14-form checksum 2048873750
InnoDB: stored checksum 913642282, prior-to-4.0.14-form stored checksum 1622372148
InnoDB: Page lsn 0 142354744, low 4 bytes of lsn at page end 142348560
InnoDB: Page number (if stored to page already) 589,
InnoDB: space id (if created with >= MySQL-4.1.1 and stored already) 0
InnoDB: Page may be an update undo log page
InnoDB: Database page corruption on disk or a failed
InnoDB: file read of page 589.
InnoDB: You may have to recover from a backup.
InnoDB: It is also possible that your operating
InnoDB: system has corrupted its own file cache
InnoDB: and rebooting your computer removes the
InnoDB: error.
InnoDB: End of page dump
160226 11:00:30  InnoDB: Page checksum 913642282 (32bit_calc: 472052024), prior-to-4.0.14-form checksum 2048873750
InnoDB: stored checksum 913642282, prior-to-4.0.14-form stored checksum 1622372148
InnoDB: Page lsn 0 142354744, low 4 bytes of lsn at page end 142348560
InnoDB: Page number (if stored to page already) 589,
InnoDB: space id (if created with >= MySQL-4.1.1 and stored already) 0
InnoDB: Page may be an update undo log page
InnoDB: Database page corruption on disk or a failed
InnoDB: file read of page 589.
InnoDB: You may have to recover from a backup.
InnoDB: It is also possible that your operating
InnoDB: system has corrupted its own file cache
InnoDB: and rebooting your computer removes the
InnoDB: error.
InnoDB: If the corrupt page is an index page
InnoDB: you can also try to fix the corruption
InnoDB: by dumping, dropping, and reimporting
InnoDB: the corrupt table. You can use CHECK
InnoDB: TABLE to scan your table for corruption.
InnoDB: See also  http://dev.mysql.com/doc/refman/5.5/en/forcing-innodb-recovery.html
InnoDB: about forcing recovery.
InnoDB: Ending processing because of a corrupt database page.
160226 11:00:30  InnoDB: Assertion failure in thread 140329989404736 in file buf0buf.c line 4032
InnoDB: We intentionally generate a memory trap.
InnoDB: Submit a detailed bug report to  http://bugs.mysql.com.
InnoDB: If you get repeated assertion failures or crashes, even
InnoDB: immediately after the mysqld startup, there may be
InnoDB: corruption in the InnoDB tablespace. Please refer to
InnoDB:  http://dev.mysql.com/doc/refman/5.5/en/forcing-innodb-recovery.html
InnoDB: about forcing recovery.
160226 11:00:30 [ERROR] mysqld got signal 6 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
160226 11:00:28  InnoDB: Page dump in ascii and hex (16384 bytes):
max_threads=153
thread_count=0 
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 466713 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0x0 
Attempting backtrace. You can use the following information to find out
160226 11:00:19  InnoDB: Page dump in ascii and hex (16384 bytes):
InnoDB: End of page dump
160226 11:00:21  InnoDB: Page checksum 913642282 (32bit_calc: 472052024), prior-to-4.0.14-form checksum 2048873750
InnoDB: stored checksum 913642282, prior-to-4.0.14-form stored checksum 1622372148
InnoDB: Page lsn 0 142354744, low 4 bytes of lsn at page end 142348560
InnoDB: Page number (if stored to page already) 589,
InnoDB: space id (if created with >= MySQL-4.1.1 and stored already) 0
InnoDB: Page may be an update undo log page
InnoDB: Database page corruption on disk or a failed
InnoDB: file read of page 589.
InnoDB: You may have to recover from a backup.
InnoDB: It is also possible that your operating
InnoDB: system has corrupted its own file cache
InnoDB: and rebooting your computer removes the
InnoDB: error.
InnoDB: If the corrupt page is an index page
InnoDB: you can also try to fix the corruption
InnoDB: by dumping, dropping, and reimporting
InnoDB: the corrupt table. You can use CHECK
InnoDB: TABLE to scan your table for corruption.
InnoDB: See also  http://dev.mysql.com/doc/refman/5.5/en/forcing-innodb-recovery.html
InnoDB: about forcing recovery.
InnoDB: Ending processing because of a corrupt database page.
160226 11:00:21  InnoDB: Assertion failure in thread 139871429470272 in file buf0buf.c line 4032
InnoDB: We intentionally generate a memory trap.
InnoDB: Submit a detailed bug report to  http://bugs.mysql.com.
InnoDB: If you get repeated assertion failures or crashes, even
InnoDB: immediately after the mysqld startup, there may be
InnoDB: corruption in the InnoDB tablespace. Please refer to
InnoDB: http://dev.mysql.com/doc/refman/5.5/en/forcing-innodb-recovery.html
InnoDB: about forcing recovery.
160226 11:00:21 [ERROR] mysqld got signal 6 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.

To report this bug, see  http://kb.askmonty.org/en/reporting-bugs

We will try our best to scrape up some info that will hopefully help
diagnose the problem, but since we have already crashed,
something is definitely wrong and this may fail.

Server version: 5.5.44-MariaDB
key_buffer_size=134217728
read_buffer_size=131072
max_used_connections=0
max_threads=153
thread_count=0
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 466713 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0x0
Attempting backtrace. You can use the following information to find out
InnoDB: End of page dump
160226 11:00:30  InnoDB: Page checksum 913642282 (32bit_calc: 472052024), prior-to-4.0.14-form checksum 2048873750
InnoDB: stored checksum 913642282, prior-to-4.0.14-form stored checksum 1622372148
InnoDB: Page lsn 0 142354744, low 4 bytes of lsn at page end 142348560
InnoDB: Page number (if stored to page already) 589,
InnoDB: space id (if created with >= MySQL-4.1.1 and stored already) 0
InnoDB: Page may be an update undo log page
InnoDB: Database page corruption on disk or a failed
InnoDB: file read of page 589.
InnoDB: You may have to recover from a backup.
InnoDB: It is also possible that your operating
InnoDB: system has corrupted its own file cache
InnoDB: and rebooting your computer removes the
InnoDB: error.
InnoDB: If the corrupt page is an index page
InnoDB: you can also try to fix the corruption
InnoDB: by dumping, dropping, and reimporting
or misconfigured. This error can also be caused by malfunctioning hardware.

To report this bug, see  http://kb.askmonty.org/en/reporting-bugs

We will try our best to scrape up some info that will hopefully help
diagnose the problem, but since we have already crashed,
something is definitely wrong and this may fail.

Server version: 5.5.44-MariaDB
key_buffer_size=134217728
read_buffer_size=131072
max_used_connections=0
max_threads=153
thread_count=0
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 466713 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0x0 thread_stack 0x48000
/usr/libexec/mysqld(my_print_stacktrace+0x3d)[0x7fa11fb574ed]
/usr/libexec/mysqld(handle_fatal_signal+0x515)[0x7fa11f76d385]
/lib64/libpthread.so.0(+0xf100)[0x7fa11ee9d100]
/lib64/libc.so.6(gsignal+0x37)[0x7fa11d6515f7]
/lib64/libc.so.6(abort+0x148)[0x7fa11d652ce8]
/usr/libexec/mysqld(+0x6971a2)[0x7fa11f9651a2]
/usr/libexec/mysqld(+0x6a8b17)[0x7fa11f976b17]
/usr/libexec/mysqld(+0x6919ee)[0x7fa11f95f9ee]
/usr/libexec/mysqld(+0x66313a)[0x7fa11f93113a]
/usr/libexec/mysqld(+0x655f93)[0x7fa11f923f93]
/usr/libexec/mysqld(+0x656dfc)[0x7fa11f924dfc]
/usr/libexec/mysqld(+0x65954e)[0x7fa11f92754e]
/usr/libexec/mysqld(+0x64290e)[0x7fa11f91090e]
/usr/libexec/mysqld(+0x5fbb9c)[0x7fa11f8c9b9c]
/usr/libexec/mysqld(_Z24ha_initialize_handlertonP13st_plugin_int+0x48)[0x7fa11f76f408]
/usr/libexec/mysqld(+0x37bff5)[0x7fa11f649ff5]
/usr/libexec/mysqld(_Z11plugin_initPiPPci+0x551)[0x7fa11f64fa61]
/usr/libexec/mysqld(+0x2ee4ba)[0x7fa11f5bc4ba]
/usr/libexec/mysqld(_Z11mysqld_mainiPPc+0x546)[0x7fa11f5bf5d6]
/lib64/libc.so.6(__libc_start_main+0xf5)[0x7fa11d63db15]
/usr/libexec/mysqld(+0x2e869d)[0x7fa11f5b669d]
The manual page at  http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
160226 11:00:30 mysqld_safe mysqld from pid file /var/run/mariadb/mariadb.pid ended

三、接下来使用官方推荐的恢复数据方法：

1、设置恢复模式启动mysql（http://dev.mysql.com/doc/refman/5.5/en/forcing-innodb-recovery.html）

vim /etc/my.cnf

添加配置项：

innodb_force_recovery = 1

其中后面的值设置为1、如果1不想再逐步增加为2/3/4等。直到能启动mysql为止！！！

2、使用恢复模式重启mysql

systemctl restart mariadb

重启成功！！！！
测试数据库连接：mysql -uroot -p123456;

正常！！！

3、备份全部数据库表：

mysqldump -uroot -p123456 --all-databases  > all_mysql_backup.sql

4、清除mysql数据（清除之前务必先stop mysql服务）：

systemctl stop mariadb
cp -r  /var/lib/mysql/ /var/lib/mysql.bak
rm -rf /var/lib/mysql/*

重启mysql服务：

正常模式在启动mysql：

vim /etc/my.cnf

注释配置项：

#innodb_force_recovery = 1

再重启：

systemctl restart mariadb

5、数据库恢复为以前密码123456：

mysqladmin -u root password 123456

6、使用之间备份的sql文件恢复数据：

mysql -uroot -p123456 -e "source /root/all_mysql_backup.sql"

查看恢复好的数据：

实验完成！！！

仅新建一个newuser用户

方法一：

MariaDB [(none)]> create user newuser@localhost identified by '123456';
Query OK, 0 rows affected (0.22 sec)

MariaDB [(none)]> select user from mysql.user;
+---------+
| user    |
+---------+
| aa      |
| root    |
| root    |
|         |
| aa      |
| bb      |
| lcz     |
| my      |
| mytest  |
| newuser |
| nome    |
| root    |
|         |
| root    |
+---------+
14 rows in set (0.00 sec)

MariaDB [(none)]> 

方法二：

MariaDB [(none)]> insert into mysql.user(user,host,password) values('ggo','localhost',password('1234'));
Query OK, 1 row affected, 4 warnings (0.24 sec)

MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.25 sec)

效果

[root@localhost ~]# mysql -uggo -p
Enter password: 
Welcome to the MariaDB monitor.  Commands end with ; or g.
Your MariaDB connection id is 4
Server version: 5.5.52-MariaDB MariaDB Server

Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

MariaDB [(none)]> 

新建一个my用户并且授权全部操作权限

MariaDB [(none)]> grant all privileges on *.* to my@localhost identified by '123456';
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> select user from mysql.user;
+--------+
| user   |
+--------+
| aa     |
| root   |
| root   |
|        |
| aa     |
| bb     |
| lcz    |
| my     |
| mytest |
| nome   |
| root   |
|        |
| root   |
+--------+
13 rows in set (0.14 sec)

MariaDB [(none)]>

查看用户权限

MariaDB [(none)]> show grants for my@localhost;
+--------------------------------------------------------------------------------------------------------------------+
| Grants for my@localhost                                                                                            |
+--------------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'my'@'localhost' IDENTIFIED BY PASSWORD '*6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9' |
+--------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

MariaDB [(none)]> 

指定部分授权

grant insert,update,delete,select on *.* to mytest@localhost;