首先我要说我是一个mysql新手.
基本上mysql没有启动并说：

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysql.sock' (2)

现在,以下是我毁掉一切的步骤：

由于无法登录我的系统(otrs),我认为恢复较旧的备份会有所帮助.

在恢复过程中,备份管理器说我需要删除旧的数据库.我尝试了但是过程没有完成,所以我取消了它.

在此之后我试图重新启动系统,但是这有很大的问题但是当我完成重启后我试图运行mysql但它说它找不到mysql.socket.

在这一点上,我认为重新安装mysql会更好,但这样做没有用.
当试图启动mysqld作为mysql用户时,它说：

[ERROR] Found 1 prepared transactions! It means that mysqld was not shut down properly last time and critical recovery information (last binlog or tc.log file) was manually deleted after a crash. You have to start mysqld with --tc-heuristic-recover switch to commit or rollback pending transactions. 

尝试两者都没有帮助：

mysql:/root> /usr/sbin/mysqld  --tc-heuristic-recover commit
131213 16:46:00 InnoDB: The InnoDB memory heap is disabled
131213 16:46:00 InnoDB: Mutexes and rw_locks use GCC atomic builtins
131213 16:46:00 InnoDB: Compressed tables use zlib 1.2.7
131213 16:46:00 InnoDB: Using Linux native AIO
131213 16:46:00 InnoDB: Initializing buffer pool, size = 128.0M
131213 16:46:00 InnoDB: Completed initialization of buffer pool
131213 16:46:00 InnoDB: highest supported file format is Barracuda.
131213 16:46:01  InnoDB: Waiting for the background threads to start
131213 16:46:02 Percona XtraDB (http://www.percona.com) 5.5.33-MariaDB-31.1 started; log sequence number 3710898915
131213 16:46:02 [Note] Server socket created on IP: '0.0.0.0'.
131213 16:46:02 [ERROR] Event Scheduler: Failed to open table mysql.event
131213 16:46:02 [ERROR] Event Scheduler: Error while loading from disk.
131213 16:46:02 [Note] Event Scheduler: Purging the queue. 0 events
131213 16:46:02 [ERROR] Aborting

131213 16:46:02  InnoDB: Starting shutdown...
131213 16:46:03  InnoDB: Shutdown completed; log sequence number 3710898915
131213 16:46:03 [Note] /usr/sbin/mysqld: Shutdown complete

运行systemctl启动mysql.service随时失败：

mysql.service - LSB: Start the MySQL database server
          Loaded: loaded (/etc/init.d/mysql)
          Active: failed (Result: timeout) since Fri, 13 Dec 2013 16:27:12 +0100; 23min ago
         Process: 8845 ExecStart=/etc/init.d/mysql start (code=killed, signal=TERM)
          CGroup: name=systemd:/system/mysql.service

Dec 13 16:31:21  mysql[8845]: otrs.user_preferences                              OK
Dec 13 16:31:21  mysql[8845]: otrs.users                                         OK
Dec 13 16:31:21  mysql[8845]: otrs.valid                                         OK
Dec 13 16:31:21  mysql[8845]: otrs.virtual_fs                                    OK
Dec 13 16:31:21  mysql[8845]: otrs.virtual_fs_db                                 OK
Dec 13 16:31:21  mysql[8845]: otrs.virtual_fs_preferences                        OK
Dec 13 16:31:21  mysql[8845]: otrs.web_upload_cache                              OK
Dec 13 16:31:21  mysql[8845]: otrs.xml_storage                                   OK
Dec 13 16:31:21  mysql[8845]: performance_schema
Dec 13 16:31:21  mysql[8845]: Phase 3/3: Running 'mysql_fix_privilege_tables'...

我完全不知道该怎么做.谁能帮助我？
如何在不使用mysql DROP命令的情况下删除/删除otrs表？
这会有帮助吗？

谢谢.

解决方法:

mysqld --tc-heuristic-recover=ROLLBACK

对我来说没有那么神奇.但是以下工作

mysqld_safe --tc-heuristic-recover=COMMIT