Question

sql server在高并发状态下同时执行查询与更新操作时发生死锁怎么办

Answer 1

sql server在高并发状态下同时执行查询与更新操作时发生死锁怎么办
DECLARE @spid INT
DECLARE @blk INT
DECLARE @count INT
DECLARE @index INT
DECLARE @lock TINYINT

SET @lock=0

CREATE TABLE #temp_who_lock
(
id INT IDENTITY(1, 1),
spid INT,
blk INT
)

--if @@error<>0 return @@error
INSERT INTO #temp_who_lock
(spid,
blk)
SELECT 0,
blocked
FROM (SELECT *
FROM master..sysprocesses
WHERE blocked > 0)a
WHERE NOT EXISTS(SELECT *
FROM master..sysprocesses
WHERE a.blocked = spid
AND blocked > 0)
UNION
SELECT spid,
blocked
FROM master..sysprocesses
WHERE blocked > 0

--if @@error<>0 return @@error
SELECT @count = Count(*),
@index = 1
FROM #temp_who_lock

--select @count,@index

--if @@error<>0 return @@error
IF @count = 0
BEGIN
SELECT '没有阻塞和死锁信息'
--return 0
END

WHILE @index <= @count
BEGIN
IF EXISTS(SELECT 1
FROM #temp_who_lock a
WHERE id > @index
AND EXISTS(SELECT 1
FROM #temp_who_lock
WHERE id <= @index
AND a.blk = spid))
BEGIN
SET @lock=1

SELECT @spid = spid,
@blk = blk
FROM #temp_who_lock
WHERE id = @index

SELECT '引起数据库死锁的是: ' + Cast(@spid AS VARCHAR(10)) + '进程号,其执行的SQL语法如下' ;

SELECT @spid,
@blk

DBCC inputbuffer(@spid)

DBCC inputbuffer(@blk)
END

SET @index=@index + 1
END

IF @lock = 0
BEGIN
SET @index=1

WHILE @index <= @count
BEGIN
SELECT @spid = spid,
@blk = blk
FROM #temp_who_lock
WHERE id = @index

IF @spid = 0
SELECT '引起阻塞的是:' + Cast(@blk 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(@blk AS VARCHAR(10)) + '阻塞,其当前进程执行的SQL语法如下'

PRINT ( LTRIM(@spid) + ''+ LTRIM(@blk));
if(@spid <> 0)
BEGIN
DBCC inputbuffer(@spid) --
END

DBCC inputbuffer(@blk) --引起阻塞语句

SET @index=@index + 1
END
END

DROP TABLE #temp_who_lock

--return 0
--KILL 54