删除数据库时出现“ERROR 2013 (HY000): Lost connection to MySQL server during query”
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"ERROR 2013 (HY000): Lost connection to MySQL server during query" while dropping database
提问by Sylvain
I have an empty database that I cannot drop. Initially, it contained a table that I couldn't SELECT from. So I DROP'ed all tables from that database and tried to DROP the database without success :
我有一个无法删除的空数据库。最初，它包含一个我无法从中选择的表。所以我删除了该数据库中的所有表并尝试删除数据库但没有成功：
mysql> drop database my_database;
ERROR 2013 (HY000): Lost connection to MySQL server during query
Now I have an empty database that I cannot remove in my server.
现在我有一个无法在服务器中删除的空数据库。
I check the mysql error.log, here is the output :
我检查了 mysql error.log，这是输出：
130812 10:02:45 InnoDB: Assertion failure in thread 140409656780544 in file row0mysql.c line 3682
InnoDB: Failing assertion: table
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.
14:02:45 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.
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=131072
max_used_connections=3
max_threads=151
thread_count=3
connection_count=3
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 346685 K bytes of memory
Hope that's ok; if not, decrease some variables in the equation.
Thread pointer: 0x7fb3ad55d030
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 = 7fb3abb71e60 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x29)[0x7fb3ac1516b9]
/usr/sbin/mysqld(handle_fatal_signal+0x3d8)[0x7fb3ac039318]
/lib/x86_64-linux-gnu/libpthread.so.0(+0xfcb0)[0x7fb3aab96cb0]
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x35)[0x7fb3aa1ff425]
/lib/x86_64-linux-gnu/libc.so.6(abort+0x17b)[0x7fb3aa202b8b]
/usr/sbin/mysqld(+0x561acd)[0x7fb3ac192acd]
/usr/sbin/mysqld(+0x542c63)[0x7fb3ac173c63]
/usr/sbin/mysqld(+0x40837f)[0x7fb3ac03937f]
/usr/sbin/mysqld(_Z24plugin_foreach_with_maskP3THDPFcS0_P13st_plugin_intPvEijS3_+0x165)[0x7fb3abf4daa5]
/usr/sbin/mysqld(_Z11mysql_rm_dbP3THDPcbb+0x300)[0x7fb3abf23580]
/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x203c)[0x7fb3abf418ac]
/usr/sbin/mysqld(+0x31301e)[0x7fb3abf4401e]
/usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x19e7)[0x7fb3abf46247]
/usr/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0x105)[0x7fb3abfe0405]
/usr/sbin/mysqld(handle_one_connection+0x50)[0x7fb3abfe0520]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x7e9a)[0x7fb3aab8ee9a]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7fb3aa2bcccd]
Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (7fb388004b90): is an invalid pointer
Connection ID (thread ID): 59
Status: NOT_KILLED
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.
130812 10:02:45 [Note] Plugin 'FEDERATED' is disabled.
130812 10:02:45 InnoDB: The InnoDB memory heap is disabled
130812 10:02:45 InnoDB: Mutexes and rw_locks use GCC atomic builtins
130812 10:02:45 InnoDB: Compressed tables use zlib 1.2.7
130812 10:02:45 InnoDB: Using Linux native AIO
130812 10:02:45 InnoDB: Initializing buffer pool, size = 128.0M
130812 10:02:45 InnoDB: Completed initialization of buffer pool
130812 10:02:45 InnoDB: highest supported file format is Barracuda.
130812 10:02:45 InnoDB: Waiting for the background threads to start
130812 10:02:46 InnoDB: 5.5.32 started; log sequence number 25852489043
130812 10:02:46 InnoDB: !!! innodb_force_recovery is set to 4 !!!
130812 10:02:46 [Note] Server hostname (bind-address): '127.0.0.1'; port: 3306
130812 10:02:46 [Note] - '127.0.0.1' resolves to '127.0.0.1';
130812 10:02:46 [Note] Server socket created on IP: '127.0.0.1'.
130812 10:02:46 [Note] Event Scheduler: Loaded 0 events
130812 10:02:46 [Note] /usr/sbin/mysqld: ready for connections.
Version: '5.5.32-0ubuntu0.12.10.1' socket: '/var/run/mysqld/mysqld.sock' port: 3306 (Ubuntu)
I tried to put the configuration innodb_force_recovery = 4and restart MySQL but it had no effect at all.
我尝试放置配置innodb_force_recovery = 4并重新启动 MySQL，但它根本没有效果。
Reinstalling the server is not an option here. It happened on many machines (2 Ubuntu and 2 CentOS), but I cannot reproduce the problem right now.
重新安装服务器不是这里的选项。它发生在许多机器上（2 台 Ubuntu 和 2 台 CentOS），但我现在无法重现该问题。
回答by Travis Crooks
I believe it has to do with InnoDB table corruption. I too had a similar issue and was able to pinpoint it to a single table. I'm still in the process of correcting the issue through duplicating the table and removing the single record that is bad in my case.
我相信这与 InnoDB 表损坏有关。我也有类似的问题，并且能够将它定位到一个表。我仍在通过复制表并删除对我来说不好的单个记录来纠正问题。
This link helped me significantly:
此链接对我有很大帮助：
Recovering InnoDB Table Corruption
Sorry for incomplete answer, but this helped me quite a bit once I found it.
对不起，答案不完整，但是一旦我找到它，这对我有很大帮助。
