Question

我有一个查询导致表的主键死锁。查询可以从多个不同的代码路径运行。每次需要运行查询时都会创建新的数据库连接，因此，就我所知，这不是连接重用问题。

有问题的查询是

CREATE PROCEDURE [dbo].[upd_task]       @taskid               INTEGER
      , @state                INTEGER
      , @args                 NVARCHAR( max )
      , @retries              INTEGER
      , @started              bit
      , @finished             bit
      , @username             NVARCHAR( 50 )    AS  BEGIN   BEGIN TRAN
      UPDATE task WITH (updlock) SET
          [state]        = @state
        , args           = @args
        , retries        = @retries
        , started   = @started
        , finished      = @finished
        , modifier      = @username
        , modified     = GETDATE()
      WHERE
        task.task_id   = @taskid    COMMIT  END

该表定义为

CREATE TABLE [dbo].[task](
    [task_id] [bigint] IDENTITY(1,1) NOT NULL,
    [job_id] [bigint] NOT NULL,
    [car_id] [int] NOT NULL,
    [uuid] [nvarchar](60) NULL,
    [user_priority] [bit] NOT NULL,
    [args] [nvarchar](max) NULL,
    [state] [int] NOT NULL,
    [started] [bit] NOT NULL,
    [finished] [bit] NOT NULL,
    [failed] [bit] NOT NULL,
    [error_msg] [nvarchar](max) NULL,
    [retries] [int] NULL,
    [exec_time] [datetime] NULL,
    [created] [datetime] NULL,
    [creator] [nvarchar](50) NULL,
    [modified] [datetime] NULL,
    [modifier] [nvarchar](50) NULL,
 CONSTRAINT [PK_task_id] PRIMARY KEY CLUSTERED 
(
    [task_id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 90) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]

GO

ALTER TABLE [dbo].[task] ADD  DEFAULT ((0)) FOR [user_priority]
GO

ALTER TABLE [dbo].[task] ADD  DEFAULT ((0)) FOR [state]
GO

ALTER TABLE [dbo].[task] ADD  DEFAULT ((0)) FOR [started]
GO

ALTER TABLE [dbo].[task] ADD  DEFAULT ((0)) FOR [finished]
GO

ALTER TABLE [dbo].[task] ADD  DEFAULT ((0)) FOR [failed]
GO

ALTER TABLE [dbo].[task] ADD  DEFAULT ((0)) FOR [retries]
GO

ALTER TABLE [dbo].[task]  WITH CHECK ADD  CONSTRAINT [FK_task_car] FOREIGN KEY([car_id])
REFERENCES [dbo].[car] ([car_id])
GO

ALTER TABLE [dbo].[task] CHECK CONSTRAINT [FK_task_car]
GO

ALTER TABLE [dbo].[task]  WITH CHECK ADD  CONSTRAINT [FK_task_job] FOREIGN KEY([job_id])
REFERENCES [dbo].[job] ([job_id])
GO

ALTER TABLE [dbo].[task] CHECK CONSTRAINT [FK_task_job]
GO

死锁图如下所示，有两个运行相同查询的实例[upd_task.e

运行同一查询的多个

0 个答案: