我在我的服务器上使用 mysql 时遇到问题。更新后 mysql 在我的系统上停止工作。它似乎在启动后立即崩溃，因此我什至无法备份我的数据库，因为该服务没有运行。我的mysql错误日志有以下内容：
tail -70 /var/log/mysql/error.log
2017-07-27T06:56:20.080287Z 0 [ERROR] InnoDB: Your database may be corrupt or you may have copied the InnoDB tablespace but not the InnoDB log files. Please refer to http://dev.mysql.com/doc/refman/5.7/en/forcing-innodb-recovery.html for information about forcing recovery.
2017-07-27T06:56:20.080330Z 0 [ERROR] InnoDB: Page [page id: space=0, page number=406] log sequence number 199107155900 is in the future! Current system log sequence number 191999990814.
2017-07-27T06:56:20.080336Z 0 [ERROR] InnoDB: Your database may be corrupt or you may have copied the InnoDB tablespace but not the InnoDB log files. Please refer to http://dev.mysql.com/doc/refman/5.7/en/forcing-innodb-recovery.html for information about forcing recovery.
2017-07-27T06:56:20.080432Z 0 [ERROR] InnoDB: Page [page id: space=0, page number=208] log sequence number 199110108309 is in the future! Current system log sequence number 191999990814.
2017-07-27T06:56:20.080440Z 0 [ERROR] InnoDB: Your database may be corrupt or you may have copied the InnoDB tablespace but not the InnoDB log files. Please refer to http://dev.mysql.com/doc/refman/5.7/en/forcing-innodb-recovery.html for information about forcing recovery.
2017-07-27T06:56:20.080481Z 0 [ERROR] InnoDB: Page [page id: space=0, page number=735] log sequence number 196716783961 is in the future! Current system log sequence number 191999990814.
2017-07-27T06:56:20.080488Z 0 [ERROR] InnoDB: Your database may be corrupt or you may have copied the InnoDB tablespace but not the InnoDB log files. Please refer to http://dev.mysql.com/doc/refman/5.7/en/forcing-innodb-recovery.html for information about forcing recovery.
2017-07-27T06:56:20.080530Z 0 [ERROR] InnoDB: Page [page id: space=0, page number=378] log sequence number 199109175046 is in the future! Current system log sequence number 191999990814.
2017-07-27T06:56:20.080536Z 0 [ERROR] InnoDB: Your database may be corrupt or you may have copied the InnoDB tablespace but not the InnoDB log files. Please refer to http://dev.mysql.com/doc/refman/5.7/en/forcing-innodb-recovery.html for information about forcing recovery.
2017-07-27T06:56:20.080586Z 0 [ERROR] InnoDB: Page [page id: space=0, page number=209] log sequence number 199110429878 is in the future! Current system log sequence number 191999990814.
2017-07-27T06:56:20.080598Z 0 [ERROR] InnoDB: Your database may be corrupt or you may have copied the InnoDB tablespace but not the InnoDB log files. Please refer to http://dev.mysql.com/doc/refman/5.7/en/forcing-innodb-recovery.html for information about forcing recovery.
2017-07-27T06:56:20.080641Z 0 [ERROR] InnoDB: Page [page id: space=0, page number=342] log sequence number 199106867077 is in the future! Current system log sequence number 191999990814.
2017-07-27T06:56:20.080647Z 0 [ERROR] InnoDB: Your database may be corrupt or you may have copied the InnoDB tablespace but not the InnoDB log files. Please refer to http://dev.mysql.com/doc/refman/5.7/en/forcing-innodb-recovery.html for information about forcing recovery.
2017-07-27T06:56:20.080690Z 0 [ERROR] InnoDB: Page [page id: space=0, page number=16395] log sequence number 199094094548 is in the future! Current system log sequence number 191999990814.
2017-07-27T06:56:20.080701Z 0 [ERROR] InnoDB: Your database may be corrupt or you may have copied the InnoDB tablespace but not the InnoDB log files. Please refer to http://dev.mysql.com/doc/refman/5.7/en/forcing-innodb-recovery.html for information about forcing recovery.
2017-07-27 08:56:20 0xb7343700 InnoDB: Assertion failure in thread 3073652480 in file fut0lst.ic line 85
InnoDB: Failing assertion: addr.page == FIL_NULL || addr.boffset >= FIL_PAGE_DATA
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/5.7/en/forcing-innodb-recovery.html
InnoDB: about forcing recovery.
06:56:20 UTC - 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.
Attempting to collect some information that could help diagnose the problem.
As this is a crash and something is definitely wrong, the information
collection process might fail.
key_buffer_size=16777216
read_buffer_size=131072
max_used_connections=0
max_threads=151
thread_count=0
connection_count=0
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 75717 K bytes of memory
Hope that's ok; if not, decrease some variables in the equation.
Thread pointer: 0x0
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 = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3c)[0x8a8b33c]
/usr/sbin/mysqld(handle_fatal_signal+0x426)[0x837f356]
[0xb77c0c14]
[0xb77c0c31]
/lib/i386-linux-gnu/libc.so.6(gsignal+0x39)[0xb738bea9]
/lib/i386-linux-gnu/libc.so.6(abort+0x157)[0xb738d407]
/usr/sbin/mysqld[0x8355dcf]
/usr/sbin/mysqld(_Z19trx_undo_lists_initP10trx_rseg_t+0xddc)[0x8d394dc]
/usr/sbin/mysqld[0x8d1d60f]
/usr/sbin/mysqld[0x8d203ec]
/usr/sbin/mysqld(_Z24trx_sys_init_at_db_startv+0x18cc)[0x8d2792c]
/usr/sbin/mysqld(_Z34innobase_start_or_create_for_mysqlv+0x5382)[0x8ceaa32]
/usr/sbin/mysqld[0x8b98d0e]
/usr/sbin/mysqld(_Z24ha_initialize_handlertonP13st_plugin_int+0x52)[0x83ccfd2]
/usr/sbin/mysqld[0x88611a2]
/usr/sbin/mysqld(_Z11plugin_initPiPPci+0x60f)[0x886916f]
/usr/sbin/mysqld[0x8377795]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0x83b)[0x837906b]
/usr/sbin/mysqld(main+0x27)[0x8357917]
/lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xf7)[0xb7378637]
/usr/sbin/mysqld[0x836f4dc]
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.
InnoDB 好像有问题。
因此，我已经尝试调整 my.conf 文件并添加了以下几行：
[mysqld]
innodb_force_recovery = 4
尝试重新启动（systemctl restart mysql.service）后，它仍然是同样的问题。
我也尝试过完全重新安装 mysql-server 但它仍然是同样的问题。
我还尝试从 /var/lib/mysql 备份每个文件并运行：
mkdir /root/backup_mysql/
mv /var/lib/mysql/* /root/backup_mysql/
dpkg --configure mysql-server-5.7
但即使在那之后，它仍然是同样的问题。
你知道如何解决这个问题吗？
问题是关联tablespace的是MySql数据库引擎InnoDb使用的CRUD操作。
用
[mysqld]
innodb_force_recovery = 1
即使检测到损坏的页面，也让服务器运行。试图让 SELECT * FROM tbl_name 跳过损坏的索引记录和页面，这有助于转储表。
这似乎对您的情况有帮助，有关更多信息，请参阅mysql 手册，错误日志中也建议这样做。
如果在不了解其影响的情况下使用不同的值，则最终可能会丢失数据。所以要小心。
如果数据不是那么重要，您可以mysql从系统中完全删除它并小心地重新安装它，这很有希望。
怎么mysql彻底去除？
转到/var/lib/mysql/系统中的类似内容，删除mysql文件夹并从/etc/mysql文件夹中手动删除配置文件。
更新您的 ubuntu 存储库并再次重新安装 mysql。
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