Question

怎样查询引起死锁的sql语句

Answer 1

elect 0 ,blocked
from (select * from sysprocesses where blocked>0 ) a
where not exists(select * from (select * from sysprocesses where blocked>0 ) b
where a.blocked=spid)
union select spid,blocked from sysprocesses where blocked>0
OPEN s_cur
FETCH NEXT FROM s_cur INTO @spid,@bl
WHILE @@FETCH_STATUS = 0
begin
if @spid =0
select ' 引起数据库死锁的是: '+ CAST(@bl AS VARCHAR(10)) + ' 进程号, 其执行的SQL 语法如下'
else
select ' 进程号SPID ：'+ CAST(@spid AS VARCHAR(10))+ ' 被' + ' 进程号SPID ：'+ CAST(@bl AS VARCHAR(10)) +' 阻塞, 其当前进程执行的SQL 语法如下'
DBCC INPUTBUFFER (@bl )

Answer 2

找到事务号，可以从 events_statements_current 找到对应的 SQL 语句：
SQL_TEXT: delete from action1 where id = 3 //具体的sql语句
DIGEST: 8f9cdb489c76ec0e324f947cc3faaa7c
DIGEST_TEXT: DELETE FROM `action1` WHERE `id` = ?
CURRENT_SCHEMA: test1
OBJECT_TYPE: NULL
OBJECT_SCHEMA: NULL
OBJECT_NAME: NULL
OBJECT_INSTANCE_BEGIN: NULL
MYSQL_ERRNO: 0
RETURNED_SQLSTATE: 00000
MESSAGE_TEXT: NULL
ERRORS: 0
WARNINGS: 0
ROWS_AFFECTED: 1
ROWS_SENT: 0
ROWS_EXAMINED: 3
CREATED_TMP_DISK_TABLES: 0
CREATED_TMP_TABLES: 0
SELECT_FULL_JOIN: 0
SELECT_FULL_RANGE_JOIN: 0
SELECT_RANGE: 0
SELECT_RANGE_CHECK: 0
SELECT_SCAN: 0
SORT_MERGE_PASSES: 0
SORT_RANGE: 0
SORT_ROWS: 0
SORT_SCAN: 0
NO_INDEX_USED: 0
NO_GOOD_INDEX_USED: 0
NESTING_EVENT_ID: NULL
NESTING_EVENT_TYPE: NULL
NESTING_EVENT_LEVEL: 0
1 row in set (0.00 sec)

可以看到是一条 delete 阻塞了后续的 update，生产环境中可以拿着这条 SQL 语句询问开发，是不是有 kill 的必要。