Question for SQL execution plan, strange..

Question

HI, all
We meet a strange problem for a execution plan. First, we have a StoreProc, it runs around less than 20 secs. One day, it runs more than 5 mins (Execution plan 1). I checked all the index (fragmentation is low and Scan density is high), and re-run the update
statistics, but the performance still have no any improvement.
This is very strange for me, why the query becomes slow suddenly on one day (we will know the performance immedidately because it is a daily function, user will report to us if the performance is low, we only got complain today.)?
Finally, we tested in two ways.
1. We run the below update statistic command with one index - "update statistics dbo.PCMS_CARD_TRANS MGM_IDX_PCMS_TRANS_TIME_PROCESSING"
Result: It runs under 20 secs.
2. We create a new index - "MGM_IDX_Test_TRANS_TIME"
Result: It runs around 1 second, but I checked the execution plan (Execution plan 2) didn't change and the new index is not use for it...we feel strange again on it......
All information was included in below:
Table - PCMS_CARD_TRANS, PCMS_CARD_PROFILE.
VIEW - PCMS_V_CR_CARD_STOCK
StoreProc:  PCMS_CardRoom_GetProcessedCardStock
Index: All zipped.

Answer 1

USE [PCMS]
GO
/****** Object: View [dbo].[PCMS_V_CR_CARD_STOCK] Script Date: 4/9/2014 4:30:54 PM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE VIEW [dbo].[PCMS_V_CR_CARD_STOCK]
AS
SELECT dbo.PCMS_CARD_PROFILE.CARD_ID, dbo.PCMS_CARD_PROFILE.TYPE_CODE, dbo.PCMS_CARD_PROFILE.COLOR_SET_CODE,
dbo.PCMS_CARD_PROFILE.VENDOR_ID, dbo.PCMS_CARD_PROFILE.CARD_STATUS, dbo.PCMS_CARD_PROFILE.LOC, dbo.PCMS_CARD_PROFILE.LOC_ID,
dbo.PCMS_CARD_PROFILE.LAST_TRANS_NO, dbo.PCMS_CARD_COLOR_SET_MASTER.COLOR_SET_DESC, dbo.PCMS_CARD_TYPE.TYPE_DESC,
dbo.PCMS_CARD_PROFILE.DECK_AMOUNT, dbo.PCMS_CARD_PROFILE.USAGE_TYPE, dbo.PCMS_CARD_PROFILE.STORAGE_ID,
dbo.PCMS_CARD_PROFILE.STORAGE, dbo.PCMS_CARD_TYPE.CARD_TYPE_GROUP
FROM dbo.PCMS_CARD_PROFILE INNER JOIN
dbo.PCMS_CARD_COLOR_SET_MASTER ON
dbo.PCMS_CARD_PROFILE.COLOR_SET_CODE = dbo.PCMS_CARD_COLOR_SET_MASTER.COLOR_SET_CODE INNER JOIN
dbo.PCMS_CARD_TYPE ON dbo.PCMS_CARD_PROFILE.TYPE_CODE = dbo.PCMS_CARD_TYPE.TYPE_CODE
WHERE (dbo.PCMS_CARD_COLOR_SET_MASTER.ENABLED = 1) AND (dbo.PCMS_CARD_TYPE.ENABLED = 1)
GO
EXEC sys.sp_addextendedproperty @name=N'MS_DiagramPane1', @value=N'[0E232FF0-B466-11cf-A24F-00AA00A3EFFF, 1.00]
Begin DesignProperties =
Begin PaneConfigurations =
Begin PaneConfiguration = 0
NumPanes = 4
Configuration = "(H (1[40] 4[20] 2[20] 3) )"
End
Begin PaneConfiguration = 1
NumPanes = 3
Configuration = "(H (1 [50] 4 [25] 3))"
End
Begin PaneConfiguration = 2
NumPanes = 3
Configuration = "(H (1 [50] 2 [25] 3))"
End
Begin PaneConfiguration = 3
NumPanes = 3
Configuration = "(H (4 [30] 2 [40] 3))"
End
Begin PaneConfiguration = 4
NumPanes = 2
Configuration = "(H (1 [56] 3))"
End
Begin PaneConfiguration = 5
NumPanes = 2
Configuration = "(H (2 [66] 3))"
End
Begin PaneConfiguration = 6
NumPanes = 2
Configuration = "(H (4 [50] 3))"
End
Begin PaneConfiguration = 7
NumPanes = 1
Configuration = "(V (3))"
End
Begin PaneConfiguration = 8
NumPanes = 3
Configuration = "(H (1[56] 4[18] 2) )"
End
Begin PaneConfiguration = 9
NumPanes = 2
Configuration = "(H (1 [75] 4))"
End
Begin PaneConfiguration = 10
NumPanes = 2
Configuration = "(H (1[66] 2) )"
End
Begin PaneConfiguration = 11
NumPanes = 2
Configuration = "(H (4 [60] 2))"
End
Begin PaneConfiguration = 12
NumPanes = 1
Configuration = "(H (1) )"
End
Begin PaneConfiguration = 13
NumPanes = 1
Configuration = "(V (4))"
End
Begin PaneConfiguration = 14
NumPanes = 1
Configuration = "(V (2))"
End
ActivePaneConfig = 0
End
Begin DiagramPane =
Begin Origin =
Top = 0
Left = 0
End
Begin Tables =
Begin Table = "PCMS_CARD_PROFILE"
Begin Extent =
Top = 6
Left = 38
Bottom = 265
Right = 212
End
DisplayFlags = 280
TopColumn = 0
End
Begin Table = "PCMS_CARD_COLOR_SET_MASTER"
Begin Extent =
Top = 6
Left = 250
Bottom = 121
Right = 426
End
DisplayFlags = 280
TopColumn = 0
End
Begin Table = "PCMS_CARD_TYPE"
Begin Extent =
Top = 6
Left = 464
Bottom = 121
Right = 637
End
DisplayFlags = 280
TopColumn = 0
End
End
End
Begin SQLPane =
End
Begin DataPane =
Begin ParameterDefaults = ""
End
Begin ColumnWidths = 13
Width = 284
Width = 1500
Width = 1500
Width = 1500
Width = 1500
Width = 1500
Width = 1500
Width = 1500
Width = 1500
Width = 1500
Width = 1500
Width = 1500
Width = 1500
End
End
Begin CriteriaPane =
Begin ColumnWidths = 11
Column = 1440
Alias = 900
Table = 1170
Output = 720
Append = 1400
NewValue = 1170
SortType = 1350
SortOrder = 1410
GroupBy = 1350
Filter = 1350
Or = 1350
Or = 1350
Or = 1350
End
End
End
' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'VIEW',@level1name=N'PCMS_V_CR_CARD_STOCK'
GO
EXEC sys.sp_addextendedproperty @name=N'MS_DiagramPaneCount', @value=1 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'VIEW',@level1name=N'PCMS_V_CR_CARD_STOCK'
GO
USE [PCMS]
GO
/****** Object: Index [IDX_PCMS_CARD_PROFILE_LOC] Script Date: 4/9/2014 4:39:51 PM ******/
CREATE NONCLUSTERED INDEX [IDX_PCMS_CARD_PROFILE_LOC] ON [dbo].[PCMS_CARD_PROFILE]
[LOC] ASC,
[LOC_ID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 90) ON [PRIMARY]
GO
USE [PCMS]
GO
/****** Object: Index [IDX_PCMS_CARD_PROFILE_LOC_USAGE] Script Date: 4/9/2014 4:39:56 PM ******/
CREATE NONCLUSTERED INDEX [IDX_PCMS_CARD_PROFILE_LOC_USAGE] ON [dbo].[PCMS_CARD_PROFILE]
[LOC] ASC,
[USAGE_TYPE] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 90) ON [PRIMARY]
GO
USE [PCMS]
GO
/****** Object: Index [IDX_PCMS_CARD_PROFILE_STORAGE] Script Date: 4/9/2014 4:40:01 PM ******/
CREATE NONCLUSTERED INDEX [IDX_PCMS_CARD_PROFILE_STORAGE] ON [dbo].[PCMS_CARD_PROFILE]
[STORAGE] ASC,
[STORAGE_ID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 90) ON [PRIMARY]
GO
USE [PCMS]
GO
/****** Object: Index [MGM_IDX_PCMS_CARD_PROFILE_CARD_ID] Script Date: 4/9/2014 4:40:07 PM ******/
CREATE NONCLUSTERED INDEX [MGM_IDX_PCMS_CARD_PROFILE_CARD_ID] ON [dbo].[PCMS_CARD_PROFILE]
[CARD_ID] ASC,
[STORAGE] ASC,
[CARD_STATUS] ASC,
[LOC] ASC
INCLUDE ( [TYPE_CODE],
[COLOR_SET_CODE],
[LOC_ID]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
USE [PCMS]
GO
/****** Object: Index [MGM_IDX_PCMS_CARD_PROFILE_CARD_STATUS] Script Date: 4/9/2014 4:40:12 PM ******/
CREATE NONCLUSTERED INDEX [MGM_IDX_PCMS_CARD_PROFILE_CARD_STATUS] ON [dbo].[PCMS_CARD_PROFILE]
[CARD_STATUS] ASC,
[VENDOR_ID] ASC,
[LOC] ASC
INCLUDE ( [CARD_ID],
[TYPE_CODE],
[COLOR_SET_CODE],
[USAGE_TYPE],
[DECK_AMOUNT],
[LAST_TRANS_NO]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
USE [PCMS]
GO
/****** Object: Index [PK_PCMS_CARD_PROFILE] Script Date: 4/9/2014 4:40:18 PM ******/
ALTER TABLE [dbo].[PCMS_CARD_PROFILE] ADD CONSTRAINT [PK_PCMS_CARD_PROFILE] PRIMARY KEY CLUSTERED
[CARD_ID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 90) ON [PRIMARY]
GO