Non-clustered Index Update not displayed in execution plan [duplicate]
-
31-10-2019 - |
Question
Possible Duplicate:
Nonclustered Index Insert
I'm trying to work out the cost of having a nonclustered index on a particular table, but I don't see any maintenance cost in the execution plan for an insert.
The table looks like this:
CREATE TABLE [dbo].[ASPStateTempSessions](
[SessionId] [nvarchar](88) NOT NULL,
[Created] [datetime] NOT NULL,
[Expires] [datetime] NOT NULL,
[LockDate] [datetime] NOT NULL,
[LockDateLocal] [datetime] NOT NULL,
[LockCookie] [int] NOT NULL,
[Timeout] [int] NOT NULL,
[Locked] [bit] NOT NULL,
[SessionItemShort] [varbinary](7000) NULL,
[SessionItemLong] [image] NULL,
[Flags] [int] NOT NULL,
PRIMARY KEY CLUSTERED
(
[SessionId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
ALTER TABLE [dbo].[ASPStateTempSessions] ADD DEFAULT (getutcdate()) FOR [Created]
GO
ALTER TABLE [dbo].[ASPStateTempSessions] ADD DEFAULT ((0)) FOR [Flags]
GO
As well as a Clustered index on [SessionID] it has the following non-clustered index
/****** Object: Index [Index_Expires] Script Date: 12/14/2012 10:13:58 ******/
CREATE NONCLUSTERED INDEX [Index_Expires] ON [dbo].[ASPStateTempSessions]
(
[Expires] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
But when I run an execution plan for the following, which updates the column on which there is a non-clustered index:
UPDATE [ASPState].dbo.ASPStateTempSessions
SET Expires = DATEADD(n, Timeout, GETUTCDATE())
WHERE SessionId = '32gghltsuoesnvlzbehchp2m2014c0f1'
RETURN 0
I don't see any mention of cost in the execution plan:
Is it usual to not see it? How can I calculate the cost of this index in write operations?
No correct solution
Licensed under: CC-BY-SA with attribution
Not affiliated with dba.stackexchange