我在Debian稳定版上运行MySQL（通常是从stable包安装的）。
每当我做一个大的ORDER BY时，mysql崩溃。 示例查询（innodb表）：
SELECT * FROM `table` INNER JOIN ( SELECT `key1`, `key2`, MAX(`date`) AS `date` FROM `table` WHERE `key2` = 1 # <-- Fancy variable to get different amount of datasets AND `someOtherIndex` >= 5 GROUP BY `key1`, `key2` ) `temp` ON `table`.`key1` = `temp`.`key1` AND `table`.`key2` = `temp`.`key2` AND `table`.`date` = `temp`.`date` INNER JOIN `key1Info` ON (`key1Info`.`id` = `table`.`key1`) ORDER BY `score` DESC # <-- The deadly ORDER BY LIMIT 500 如果我使WHERE key2 = 1我有大约6000个数据集，一切工作仍然可以。 如果我使WHERE key2 = 2我有大约18000数据集和mysql将崩溃（mysql错误2013，在查询期间丢失的连接），所有后续的查询将得到“mysql消失”的错误。 如果没有ORDER BY行，甚至可以select18000个数据集而不会崩溃mysql守护进程。
这样的崩溃后的MySQL日志：
[lots of cryptic hex-ascii stuff called "page dump"] Sep 8 16:47:22 kvm01 mysqld: InnoDB: End of page dump Sep 8 16:47:22 kvm01 mysqld: 130908 16:47:22 InnoDB: Page checksum 942713336, prior-to-4.0.14-form checksum 548706977 Sep 8 16:47:22 kvm01 mysqld: InnoDB: stored checksum 3862697688, prior-to-4.0.14-form stored checksum 548706977 Sep 8 16:47:22 kvm01 mysqld: InnoDB: Page lsn 6 2842419796, low 4 bytes of lsn at page end 2842419796 Sep 8 16:47:22 kvm01 mysqld: InnoDB: Page number (if stored to page already) 16182, Sep 8 16:47:22 kvm01 mysqld: InnoDB: space id (if created with >= MySQL-4.1.1 and stored already) 0 Sep 8 16:47:22 kvm01 mysqld: InnoDB: Page may be an index page where index id is 174 Sep 8 16:47:22 kvm01 mysqld: InnoDB: (index "summoner_champion_date" of table "lolskill_net"."skillscore") Sep 8 16:47:22 kvm01 mysqld: InnoDB: Database page corruption on disk or a failed Sep 8 16:47:22 kvm01 mysqld: InnoDB: file read of page 16182. Sep 8 16:47:22 kvm01 mysqld: InnoDB: You may have to recover from a backup. Sep 8 16:47:22 kvm01 mysqld: InnoDB: It is also possible that your operating Sep 8 16:47:22 kvm01 mysqld: InnoDB: system has corrupted its own file cache Sep 8 16:47:22 kvm01 mysqld: InnoDB: and rebooting your computer removes the Sep 8 16:47:22 kvm01 mysqld: InnoDB: error. Sep 8 16:47:22 kvm01 mysqld: InnoDB: If the corrupt page is an index page Sep 8 16:47:22 kvm01 mysqld: InnoDB: you can also try to fix the corruption Sep 8 16:47:22 kvm01 mysqld: InnoDB: by dumping, dropping, and reimporting Sep 8 16:47:22 kvm01 mysqld: InnoDB: the corrupt table. You can use CHECK Sep 8 16:47:22 kvm01 mysqld: InnoDB: TABLE to scan your table for corruption. Sep 8 16:47:22 kvm01 mysqld: InnoDB: See also http://dev.mysql.com/doc/refman/5.5/en/forcing-innodb-recovery.html Sep 8 16:47:22 kvm01 mysqld: InnoDB: about forcing recovery. Sep 8 16:47:22 kvm01 mysqld: InnoDB: Ending processing because of a corrupt database page. Sep 8 16:47:22 kvm01 mysqld: 130908 16:47:22 InnoDB: Assertion failure in thread 139673058604800 in file buf0buf.c line 3629 Sep 8 16:47:22 kvm01 mysqld: InnoDB: We intentionally generate a memory trap. Sep 8 16:47:22 kvm01 mysqld: InnoDB: Submit a detailed bug report to http://bugs.mysql.com. Sep 8 16:47:22 kvm01 mysqld: InnoDB: If you get repeated assertion failures or crashes, even Sep 8 16:47:22 kvm01 mysqld: InnoDB: immediately after the mysqld startup, there may be Sep 8 16:47:22 kvm01 mysqld: InnoDB: corruption in the InnoDB tablespace. Please refer to Sep 8 16:47:22 kvm01 mysqld: InnoDB: http://dev.mysql.com/doc/refman/5.5/en/forcing-innodb-recovery.html Sep 8 16:47:22 kvm01 mysqld: InnoDB: about forcing recovery. Sep 8 16:47:22 kvm01 mysqld: 14:47:22 UTC - mysqld got signal 6 ; Sep 8 16:47:22 kvm01 mysqld: This could be because you hit a bug. It is also possible that this binary Sep 8 16:47:22 kvm01 mysqld: or one of the libraries it was linked against is corrupt, improperly built, Sep 8 16:47:22 kvm01 mysqld: or misconfigured. This error can also be caused by malfunctioning hardware. Sep 8 16:47:22 kvm01 mysqld: We will try our best to scrape up some info that will hopefully help Sep 8 16:47:22 kvm01 mysqld: diagnose the problem, but since we have already crashed, Sep 8 16:47:22 kvm01 mysqld: something is definitely wrong and this may fail. Sep 8 16:47:22 kvm01 mysqld: Sep 8 16:47:22 kvm01 mysqld: key_buffer_size=16777216 Sep 8 16:47:22 kvm01 mysqld: read_buffer_size=131072 Sep 8 16:47:22 kvm01 mysqld: max_used_connections=17 Sep 8 16:47:22 kvm01 mysqld: max_threads=151 Sep 8 16:47:22 kvm01 mysqld: thread_count=14 Sep 8 16:47:22 kvm01 mysqld: connection_count=14 Sep 8 16:47:22 kvm01 mysqld: It is possible that mysqld could use up to Sep 8 16:47:22 kvm01 mysqld: key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 192058 K bytes of memory Sep 8 16:47:22 kvm01 mysqld: Hope that's ok; if not, decrease some variables in the equation. Sep 8 16:47:22 kvm01 mysqld: Sep 8 16:47:22 kvm01 mysqld: Thread pointer: 0x7f08240433c0 Sep 8 16:47:22 kvm01 mysqld: Attempting backtrace. You can use the following information to find out Sep 8 16:47:22 kvm01 mysqld: where mysqld died. If you see no messages after this, something went Sep 8 16:47:22 kvm01 mysqld: terribly wrong... Sep 8 16:47:22 kvm01 mysqld: stack_bottom = 7f082b0aee80 thread_stack 0x30000 Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(my_print_stacktrace+0x29)[0x7f0849403569] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(handle_fatal_signal+0x3d8)[0x7f08492eb748] Sep 8 16:47:22 kvm01 mysqld: /lib/x86_64-linux-gnu/libpthread.so.0(+0xf030)[0x7f0848a9d030] Sep 8 16:47:22 kvm01 mysqld: /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x35)[0x7f0847330475] Sep 8 16:47:22 kvm01 mysqld: /lib/x86_64-linux-gnu/libc.so.6(abort+0x180)[0x7f08473336f0] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(+0x5ba4d9)[0x7f08494864d9] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(+0x5c50ac)[0x7f08494910ac] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(+0x5c5a1c)[0x7f0849491a1c] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(+0x5b6355)[0x7f0849482355] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(+0x5a28df)[0x7f084946e8df] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(+0x56ad4b)[0x7f0849436d4b] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(+0x545dba)[0x7f0849411dba] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(+0x34a4a7)[0x7f08492164a7] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(_Z10sub_selectP4JOINP13st_join_tableb+0x5b)[0x7f084921454b] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(+0x34837a)[0x7f084921437a] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(_Z10sub_selectP4JOINP13st_join_tableb+0x76)[0x7f0849214566] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(+0x34837a)[0x7f084921437a] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(_Z10sub_selectP4JOINP13st_join_tableb+0x76)[0x7f0849214566] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(+0x3578b5)[0x7f08492238b5] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(_ZN4JOIN4execEv+0x4b2)[0x7f0849231812] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(_Z12mysql_selectP3THDPPP4ItemP10TABLE_LISTjR4ListIS1_ES2_jP8st_orderSB_S2_SB_yP13select_resultP18st_select_lex_unitP13st_select_lex+0x11d)[0x7f084922d60d] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(_Z13handle_selectP3THDP3LEXP13select_resultm+0x174)[0x7f08492336d4] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(+0x320464)[0x7f08491ec464] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x1309)[0x7f08491f3189] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(+0x32a64e)[0x7f08491f664e] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x193b)[0x7f08491f87cb] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0x105)[0x7f08492929b5] Sep 8 16:47:22 kvm01 mysqld: /usr/sbin/mysqld(handle_one_connection+0x50)[0x7f0849292ad0] Sep 8 16:47:22 kvm01 mysqld: /lib/x86_64-linux-gnu/libpthread.so.0(+0x6b50)[0x7f0848a94b50] Sep 8 16:47:22 kvm01 mysqld: /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7f08473d8a7d] Sep 8 16:47:22 kvm01 mysqld: Sep 8 16:47:22 kvm01 mysqld: Trying to get some variables. Sep 8 16:47:22 kvm01 mysqld: Some pointers may be invalid and cause the dump to abort. Sep 8 16:47:22 kvm01 mysqld: Query (7f084b6abd20): SELECT `skillscore`.`id`, Sep 8 16:47:22 kvm01 mysqld: #011#011`skillscore`.`summoner`, Sep 8 16:47:22 kvm01 mysqld: #011#011`summoners`.`realm`, Sep 8 16:47:22 kvm01 mysqld: #011#011`skillscore`.`champion`, Sep 8 16:47:22 kvm01 mysqld: #011#011`skillscore`.`score` Sep 8 16:47:22 kvm01 mysqld: #011FROM `skillscore` Sep 8 16:47:22 kvm01 mysqld: #011INNER JOIN ( Sep 8 16:47:22 kvm01 mysqld: #011#011SELECT `summoner`, Sep 8 16:47:22 kvm01 mysqld: #011#011#011`champion`, Sep 8 16:47:22 kvm01 mysqld: #011#011#011MAX(`date`) AS `date` Sep 8 16:47:22 kvm01 mysqld: #011#011FROM `skillscore` Sep 8 16:47:22 kvm01 mysqld: #011#011WHERE `champion` = 103 Sep 8 16:47:22 kvm01 mysqld: #011#011AND `games` >= 5 Sep 8 16:47:22 kvm01 mysqld: #011#011GROUP BY `summoner`, `champion` Sep 8 16:47:22 kvm01 mysqld: #011#011ORDER BY `score` DESC Sep 8 16:47:22 kvm01 mysqld: #011) `temp` ON `skillscore`.`summoner` = `temp`.`summoner` AND `skillscore`.`champion` = `temp`.`champion` AND `skillscore`.`date` = `temp`.`date` Sep 8 16:47:22 kvm01 mysqld: #011INNER JOIN `summoners` ON (`summoners`.`id` = `skillscore`.`summoner`) Sep 8 16:47:22 kvm01 mysqld: #011ORDER BY `score` DESC Sep 8 16:47:22 kvm01 mysqld: #011LIMIT 500 Sep 8 16:47:22 kvm01 mysqld: Connection ID (thread ID): 314 Sep 8 16:47:22 kvm01 mysqld: Status: NOT_KILLED Sep 8 16:47:22 kvm01 mysqld: Sep 8 16:47:22 kvm01 mysqld: The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains Sep 8 16:47:22 kvm01 mysqld: information that should help you find out what is causing the crash. Sep 8 16:47:22 kvm01 mysqld_safe: Number of processes running now: 0 Sep 8 16:47:22 kvm01 mysqld_safe: mysqld restarted Sep 8 16:47:22 kvm01 mysqld: 130908 16:47:22 [Note] Plugin 'FEDERATED' is disabled. Sep 8 16:47:22 kvm01 mysqld: 130908 16:47:22 InnoDB: The InnoDB memory heap is disabled Sep 8 16:47:22 kvm01 mysqld: 130908 16:47:22 InnoDB: Mutexes and rw_locks use GCC atomic builtins Sep 8 16:47:22 kvm01 mysqld: 130908 16:47:22 InnoDB: Compressed tables use zlib 1.2.7 Sep 8 16:47:22 kvm01 mysqld: 130908 16:47:22 InnoDB: Using Linux native AIO Sep 8 16:47:22 kvm01 mysqld: 130908 16:47:22 InnoDB: Initializing buffer pool, size = 256.0M Sep 8 16:47:22 kvm01 mysqld: 130908 16:47:22 InnoDB: Completed initialization of buffer pool Sep 8 16:47:22 kvm01 mysqld: 130908 16:47:22 InnoDB: highest supported file format is Barracuda. Sep 8 16:47:22 kvm01 mysqld: InnoDB: Log scan progressed past the checkpoint lsn 28753523976 Sep 8 16:47:22 kvm01 mysqld: 130908 16:47:22 InnoDB: Database was not shut down normally! Sep 8 16:47:22 kvm01 mysqld: InnoDB: Starting crash recovery. Sep 8 16:47:22 kvm01 mysqld: InnoDB: Reading tablespace information from the .ibd files... Sep 8 16:47:22 kvm01 mysqld: InnoDB: Restoring possible half-written data pages from the doublewrite Sep 8 16:47:22 kvm01 mysqld: InnoDB: buffer... Sep 8 16:47:22 kvm01 mysqld: InnoDB: Doing recovery: scanned up to log sequence number 28753832298 Sep 8 16:47:22 kvm01 mysqld: 130908 16:47:22 InnoDB: Starting an apply batch of log records to the database... Sep 8 16:47:22 kvm01 mysqld: InnoDB: Progress in percents: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 Sep 8 16:47:22 kvm01 mysqld: InnoDB: Apply batch completed Sep 8 16:47:22 kvm01 mysqld: 130908 16:47:22 InnoDB: Waiting for the background threads to start
一些可能相关的my.cnf数据：
[mysqld] key_buffer = 16M max_allowed_packet = 16M thread_stack = 192K thread_cache_size = 16 innodb_buffer_pool_size = 256M max_heap_table_size = 64M tmp_table_size = 64M sort_buffer_size = 1M read_rnd_buffer_size = 1M query_cache_limit = 1M query_cache_size = 16M
任何机会，这是MySQL的错误？ 还是出了什么问题？ 如何解决它？
尝试运行innochecksum检查表损坏。