Question

我有一个DELETE命令，当我从我的应用程序运行它时超时。为了调查我在SQL Server Management Studio中放置了相同的命令并立即执行。任何人都可以指出我正确的方向找到延迟的原因吗？

在SQL Server Management Studio中输入：

DECLARE @docid INT;
SET @docid = 41;
DELETE FROM reports WHERE doc_id=@docid;

报告表只有5行，其中1行的docid为41.

报告表非常简单：

CREATE TABLE [dbo].[reports](
    [doc_id] [int] NULL,
    [candidate_id] [int] NULL,
    [report] [varbinary](max) NOT NULL,
    [ext] [nvarchar](10) NULL

对两个ID都有一些限制。

更多信息：

如果我从同一个地方的其他桌子上删除它会很开心。
连接是指同一台计算机上的本地实例。

这是我在应用程序中执行时遇到的异常：

{System.Data.SqlClient.SqlException（0x80131904）：超时已过期。在完成操作或之前经过的超时时间服务器没有响应。 ---＆GT; System.ComponentModel.Win32Exception （0x80004005）：等待操作超时 System.Data.SqlClient.SqlConnection.OnError（SqlException异常， Boolean breakConnection，Action 1 wrapCloseInAction) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource 1完成，Int32超时，Task＆amp;任务，布尔asyncWrite）at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery（TaskCompletionSource`1 completion，String methodName，Boolean sendToPipe，Int32 timeout，布尔asyncWrite）at System.Data.SqlClient.SqlCommand.ExecuteNonQuery（）

Answer 1

您可以运行此查看以查看所有正在运行的查询（以及正在运行的代码）以及阻止spid详细信息...一旦确定了罪魁祸首，就可以从那里开始。

当您的应用超时时，您需要运行此功能才能正确获取信息。

SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
IF OBJECT_ID('TEMPDB..#SPID') IS NOT NULL DROP TABLE #SPID
DECLARE @InputBuffer TABLE (
        ID INT IDENTITY(1,1) PRIMARY KEY,
        SPID INT,
        BLOCKED INT,
        CPU BIGINT,
        PHYSICAL_IO BIGINT,
        EventType [nvarchar](1024),
        Parameter [int],
        EventInfo [nvarchar](MAX)
    )

DECLARE @SPID INT, @ID INT, @CPU BIGINT, @IO BIGINT, @BLOCKED INT

select spid, blocked, SUM(cpu) as cpu, SUM(physical_io) as physical_io
INTO #SPID
from sys.sysprocesses
where  status<>'sleeping'
group by spid, blocked

DECLARE SPID CURSOR LOCAL
FOR 
SELECT SPID, BLOCKED, CPU, PHYSICAL_IO FROM #SPID
OPEN SPID
FETCH NEXT FROM SPID INTO @SPID, @BLOCKED, @CPU, @IO
WHILE @@FETCH_STATUS=0
BEGIN
    INSERT INTO @InputBuffer (EventType, Parameter, EventInfo) EXEC('DBCC INPUTBUFFER('+@SPID +')')
    SET @ID = SCOPE_IDENTITY()
    UPDATE @InputBuffer SET SPID = @SPID, BLOCKED=@BLOCKED, CPU = @CPU, PHYSICAL_IO = @IO WHERE ID = @ID
    FETCH NEXT FROM SPID INTO @SPID, @BLOCKED, @CPU, @IO
END
CLOSE SPID
DEALLOCATE SPID

UPDATE @InputBuffer SET EventInfo = REPLACE(EventInfo,'SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED','')
DELETE FROM @InputBuffer WHERE EventInfo='sys.sp_reset_connection;1' or EventInfo is null
SELECT * FROM @InputBuffer ORDER BY PHYSICAL_IO desc

Answer 2

我不太确定，但是当桌子被锁定时会发生这种情况。检查特定的表是否已死锁。

DELETE命令超时

2 个答案: