今日は後回しにしていたたMySQLの復旧を行いました。以下のメッセージから調査した所 innodb_force_recovery 値を設定することで復旧ができる可能性があることを見つけたのでどのレベルで復旧できるか試してみました。
170126 17:55:26 InnoDB: Assertion failure in thread 3796 in file fut0lst.ic line 83 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/5.5/en/forcing-innodb-recovery.html InnoDB: about forcing recovery. 170126 17:55:26 - mysqld got exception 0xc0000005 ; 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. 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. key_buffer_size=16777216 read_buffer_size=262144 max_used_connections=1 max_threads=151 thread_count=1 connection_count=1 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 133447 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. Thread pointer: 0x37191b0 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... 003568DE mysqld.exe!my_osmaperr() 00356C2A mysqld.exe!my_osmaperr() 003572F3 mysqld.exe!my_osmaperr() 002E6E63 mysqld.exe!my_osmaperr() 0034F233 mysqld.exe!my_osmaperr() 002F5D15 mysqld.exe!my_osmaperr() 00426C94 mysqld.exe!my_mb_ctype_mb() 00413858 mysqld.exe!my_mb_ctype_mb()
まずは innodb_force_recovery=1 。・・・
無事復旧。
まだまだ障害レベルとしては甘かった・・・あっけなく復旧できてしまいました。レベルとしては 1 ~ 6 までの 6 段階あり、障害規模に応じてレベルを変えていく、そのかわり復旧できる部分は減っていくという感じです。無事に復旧できて良かった。
タグ :mysql