我从生产系统有一个奇怪的问题。我已经阅读使用no_lock进行读操作定义的已提交事务,并在同一范围内使用表锁进行写操作。阅读提交,没有锁。搞砸
但是,多个进程能够覆盖锁定并且能够执行写入操作,并且具有很大的影响。请帮忙!。谢谢。
using (TransactionScope transaction = new TransactionScope(TransactionScopeOption.Required, new TransactionOptions() { IsolationLevel = System.Transactions.IsolationLevel.ReadCommitted }))
{
dataAccess.ExecNonQuery("GetNextOrder", parametersList); //read orders from table 1, there is NO_lock in the SP
orderIDParameter = (IParameter)parametersList[0];
int orderIDParameterValue = (int) orderIDParameter.Value;
if (orderIDParameterValue != NullOrderID)
{
parametersList.Clear();
IParameter orderIDLockParameter = SQLClientFactory.GetParameter("@OrderID", orderIDParameterValue, Direction.In);
IParameter lockNameParameter = SQLClientFactory.GetParameter("@LockName", lockName, Direction.In);
parametersList.Add(orderIDLockParameter);
parametersList.Add(lockNameParameter);
dataAccess.ExecNonQuery("Insert_SP", parametersList); //Insert into table 2
orderID = orderIDParameterValue;
}
transaction.Complete();
}
存储过程:GetNextOrder
SELECT top 1 @OrderID=ht.OrderID
FROM dbo.table1 ht WITH(nolock)
left join dbo.table2 htl WITH(nolock) on ht.orderid = htl.orderid
WHERE ht.Status in (0,1)
存储过程:Insert_SP
CREATE procedure [dbo].[Insert_SP] (
@OrderID INT,
@LockName VARCHAR(50)
)
AS
BEGIN
SET NOCOUNT ON
insert into table2 (OrderID, LockName) VALUES (@OrderID, @LockName)
SET NOCOUNT OFF
END
那么其他SP如何看?在哪种情况下你有问题? – erikkallen
我已经更新了SP。一种可能性是多个进程调用相同的代码。谢谢回复。 – Adarsh
您是如何确定“多个进程能够重写锁并能够以极大影响执行写操作的”?顺便说一句,你没有在插入SB中使用表锁,而是使用行锁。 – erikkallen