数据库死锁解决

MySQL

查找当前的事务和锁信息

查询正在执行的事务和锁的信息
show engine innodb status

找到被阻塞的事务和线程id

或者

查询当前锁和锁的等待情况
select * from information_schema.innodb_locks;
select * from information_schema.innodb_locks_waits;

再通过information_schema的innodb_trx找到事务id和线程id的对应关系
select * from information_schema.innodb_trx where trx_id = <事务id>

手动终止该事务

kill <thread_id>

Oracle

--查找oracle中被锁的行 所谓的行锁
SELECT l.session_id      "会话标识符",
       s.SERIAL#       "会话序列号",
       l.locked_mode     "锁模式",
       l.oracle_username "数据库名",
       l.os_user_name    "计算机用户名",
       s.machine         "操作系统机器名称(计算机组/名)",
       s.terminal        "计算机名",
       o.object_name     "数据库表名",
       s.program         "操作系统程序名称",
       s.logon_time      "时间"
  FROM v$locked_object l, all_objects o, v$session s
 WHERE l.object_id = o.object_id
   AND l.session_id = s.sid
 ORDER BY sid, s.serial#;

alter system kill session '3424,32170';