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Performance problem with varchar and utf-8

July 10, 2020, 8:10 am
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I have a problem with a simple query that takes more than 30 second to complete. The query is a simple "SELECT" from a single table and the resultset contains 64 rows.
Im not sure why it takes so long because the query is simple and the execution plan dont show any issues.

I checked the Sql Server log and found this message multiple times:
"A significant part of sql server process memory has been paged out. This may result in a performance degradation. Duration: 0 seconds. Working set (KB): 1142644, committed (KB): 2241136, memory utilization: 50%".
So i checked the memory usage of the Sql Server process while the query is running and it increases from ~400MB to ~1.5GB. It seems that the OS started paging and slows down everything.
But why?

I have to mention that the varchar columns of the table uses the collation Latin1_General_100_CI_AI_SC_UTF8. When i switch the collation to Latin1_General_100_CI_AI_SC it runs without  any problems.

Is this a encoding bug in the SQL Server 2019? Can anyone else reproduce this or can explain me what is going on?

What i used:

  • SQL Server 2019, SELECT @@Version:  Microsoft SQL Server 2019 (RTM-CU5) (KB4552255) - 15.0.4043.16 (X64)   Jun 10 2020 18:25:25   Copyright (C) 2019 Microsoft Corporation  Standard Edition (64-bit) on Windows Server 2019 Standard 10.0 <X64> (Build 17763: ) (Hypervisor)
  • ODBC Driver 64-bit, 2017.175.02.01
  • Microsoft SQL Management Studio v18.5, 15.0.18330.0

The query

SELECT
[ID] AS [ID]
,[Column1]
,[Column2]
,[Column3]
,[Column4]
,[Column5]
,[Column6]
,[Column7]
,[Column8]
FROM [dbo].[MyTable]
WHERE [ID] IN (3,7,8,9,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81)

The table

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[MyTable](
	[ID] [int] NOT NULL,
	[Column1] [varchar](250) COLLATE Latin1_General_100_CI_AI_SC_UTF8 NULL,
	[Column2] [varchar](36) COLLATE Latin1_General_100_CI_AI_SC_UTF8 NULL,
	[Column3] [int] NULL,
	[Column4] [int] NULL,
	[Column5] [int] NULL,
	[Column6] [varchar](250) COLLATE Latin1_General_100_CI_AI_SC_UTF8 NULL,
	[Column7] [varchar](250) COLLATE Latin1_General_100_CI_AI_SC_UTF8 NULL,
	[Column8] [int] NULL,
 CONSTRAINT [PK_MyTable] PRIMARY KEY CLUSTERED 
(
	[ID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
GO

The data

INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (3, N'ABC', N'abc', 1226, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (7, N'ABC', N'abc', 1226, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (8, N'ABC', N'abc', 1226, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (9, N'ABC', N'abc', 1226, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (11, N'ABC', N'abc', 1226, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (12, N'ABC', N'abc', 1226, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (13, N'ABC', N'abc', 1226, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (14, N'ABC', N'abc', 1226, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (15, N'ABC', N'abc', 1226, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (16, N'ABC', N'abc', 1226, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (17, N'ABC', N'abc', 1226, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (18, N'ABC', N'abc', 1227, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (19, N'ABC', N'abc', 1227, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (20, N'ABC', N'abc', 1227, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (21, N'ABC', N'abc', 1227, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (22, N'ABC', N'abc', 1229, 6142, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (23, N'ABC', N'abc', 1257, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (24, N'ABC', N'abc', 1257, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (25, N'ABC', N'abc', 1257, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (26, N'ABC', N'abc', 1257, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (27, N'ABC', N'abc', 1230, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (28, N'ABC', N'abc', 1230, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (29, N'ABC', N'abc', 1230, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (30, N'ABC', N'abc', 1230, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (31, N'ABC', N'abc', 1231, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (32, N'ABC', N'abc', 1231, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (33, N'ABC', N'abc', 1231, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (34, N'ABC', N'abc', 1231, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (35, N'ABC', N'abc', 1233, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (36, N'ABC', N'abc', 1233, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (37, N'ABC', N'abc', 1233, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (38, N'ABC', N'abc', 1233, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (39, N'ABC', N'abc', 1232, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (40, N'ABC', N'abc', 1232, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (41, N'ABC', N'abc', 1232, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (42, N'ABC', N'abc', 1232, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (43, N'ABC', N'abc', 1228, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (44, N'ABC', N'abc', 1228, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (45, N'ABC', N'abc', 1228, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (46, N'ABC', N'abc', 1228, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (47, N'ABC', N'abc', 1227, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (48, N'ABC', N'abc', 1227, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (49, N'ABC', N'abc', 1227, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (50, N'ABC', N'abc', 1227, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (51, N'ABC', N'abc', 1227, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (52, N'ABC', N'abc', 1227, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (53, N'ABC', N'abc', 1227, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (64, N'ABC', N'abc', 1257, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (65, N'ABC', N'abc', 1257, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (66, N'ABC', N'abc', 1257, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (67, N'ABC', N'abc', 1257, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (68, N'ABC', N'abc', 1257, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (69, N'ABC', N'abc', 1257, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (70, N'ABC', N'abc', 1257, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (71, N'ABC', N'abc', 1226, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (72, N'ABC', N'abc', 1226, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (73, N'ABC', N'abc', 1226, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (74, N'ABC', N'abc', 1226, 6605, 1, N'abc', NULL, 1)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (75, N'ABC', N'abc', 1226, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (76, N'ABC', N'abc', 1226, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (77, N'ABC', N'abc', 1226, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (78, N'ABC', N'abc', 1226, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (79, N'ABC', N'abc', 1226, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (80, N'ABC', N'abc', 1226, 6103, 1, N'abc', NULL, 4)
INSERT [dbo].[MyTable] ([ID], [Column1], [Column2], [Column3], [Column4], [Column5], [Column6], [Column7], [Column8]) VALUES (81, N'ABC', N'abc', 1226, 6103, 1, N'abc', NULL, 4)
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