J'essaie de résoudre une requête à exécution lente à l'aide de Show Plan Analysis (SSMS) sur le plan d'exécution réel. L'outil d'analyse souligne que les estimations du nombre de lignes ne correspondent pas aux résultats renvoyés à quelques endroits du plan et me donne en outre des avertissements de conversion implicites.
Je ne comprends pas ces conversions implicites d'int sur Varchar - Les champs référencés ne font partie d'aucun paramètre / filtre sur la requête et dans toutes les tables impliquées, les types de données de colonne sont les mêmes:
J'obtiens les avertissements CardinalityEstimate ci-dessous:
La conversion de type dans l'expression (CONVERT_IMPLICIT (varchar (12), [ccd]. [Profileid], 0)) peut affecter "CardinalityEstimate" dans le choix du plan de requête - Ce champ est un entier partout dans ma base de données
La conversion de type dans l'expression (CONVERT_IMPLICIT (varchar (6), [ccd]. [Nodeid], 0)) peut affecter "CardinalityEstimate" dans le choix du plan de requête - Ce champ est un petit bout partout dans ma base de données
La conversion de type dans l'expression (CONVERT_IMPLICIT (varchar (6), [ccd]. [Sessionseqnum], 0)) peut affecter "CardinalityEstimate" dans le choix du plan de requête - Ce champ est un petit bout partout dans ma base de données
La conversion de type dans l'expression (CONVERT_IMPLICIT (varchar (41), [ccd]. [Sessionid], 0)) peut affecter "CardinalityEstimate" dans le choix du plan de requête - Ce champ est une décimale partout dans ma base de données
[EDIT] Voici la requête et le plan d'exécution réel pour référence https://www.brentozar.com/pastetheplan/?id=SysYt0NzN
Et les définitions des tableaux ..
/****** Object: Table [dbo].[agentconnectiondetail] Script Date: 1/10/2019 9:10:04 AM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[agentconnectiondetail](
[sessionid] [decimal](18, 0) NOT NULL,
[sessionseqnum] [smallint] NOT NULL,
[nodeid] [smallint] NOT NULL,
[profileid] [int] NOT NULL,
[resourceid] [int] NOT NULL,
[startdatetime] [datetime2](7) NOT NULL,
[enddatetime] [datetime2](7) NOT NULL,
[qindex] [smallint] NOT NULL,
[gmtoffset] [smallint] NOT NULL,
[ringtime] [smallint] NULL,
[talktime] [smallint] NULL,
[holdtime] [smallint] NULL,
[worktime] [smallint] NULL,
[callwrapupdata] [varchar](40) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[callresult] [smallint] NULL,
[dialinglistid] [int] NULL,
[convertedStartDatetimelocal] [datetime2](7) NULL,
[convertedEndDatetimelocal] [datetime2](7) NULL,
CONSTRAINT [PK_agentconnectiondetail] PRIMARY KEY CLUSTERED
(
[sessionid] ASC,
[sessionseqnum] ASC,
[nodeid] ASC,
[profileid] ASC,
[resourceid] ASC,
[startdatetime] ASC,
[qindex] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
/****** Object: Table [dbo].[contactcalldetail] Script Date: 1/10/2019 9:10:04 AM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[contactcalldetail](
[sessionid] [decimal](18, 0) NOT NULL,
[sessionseqnum] [smallint] NOT NULL,
[nodeid] [smallint] NOT NULL,
[profileid] [int] NOT NULL,
[contacttype] [smallint] NOT NULL,
[contactTypeDescription] [varchar](20) COLLATE Latin1_General_CI_AS NULL,
[contactdisposition] [smallint] NOT NULL,
[contactdispositionDescription] [varchar](20) COLLATE Latin1_General_CI_AS NULL,
[dispositionreason] [varchar](100) COLLATE Latin1_General_CI_AS NULL,
[originatortype] [smallint] NOT NULL,
[originatorTypeDescription] [varchar](20) COLLATE Latin1_General_CI_AS NULL,
[originatorid] [int] NULL,
[originatordn] [varchar](30) COLLATE Latin1_General_CI_AS NULL,
[destinationtype] [smallint] NULL,
[destinationTypeDescription] [varchar](20) COLLATE Latin1_General_CI_AS NULL,
[destinationid] [int] NULL,
[destinationdn] [varchar](30) COLLATE Latin1_General_CI_AS NULL,
[startdatetimeUTC] [datetime2](7) NOT NULL,
[enddatetimeUTC] [datetime2](7) NOT NULL,
[gmtoffset] [smallint] NOT NULL,
[callednumber] [varchar](30) COLLATE Latin1_General_CI_AS NULL,
[origcallednumber] [varchar](30) COLLATE Latin1_General_CI_AS NULL,
[applicationtaskid] [decimal](18, 0) NULL,
[applicationid] [int] NULL,
[applicationname] [varchar](30) COLLATE Latin1_General_CI_AS NULL,
[connecttime] [smallint] NULL,
[customvariable1] [varchar](40) COLLATE Latin1_General_CI_AS NULL,
[customvariable2] [varchar](40) COLLATE Latin1_General_CI_AS NULL,
[customvariable3] [varchar](40) COLLATE Latin1_General_CI_AS NULL,
[customvariable4] [varchar](40) COLLATE Latin1_General_CI_AS NULL,
[customvariable5] [varchar](40) COLLATE Latin1_General_CI_AS NULL,
[customvariable6] [varchar](40) COLLATE Latin1_General_CI_AS NULL,
[customvariable7] [varchar](40) COLLATE Latin1_General_CI_AS NULL,
[customvariable8] [varchar](40) COLLATE Latin1_General_CI_AS NULL,
[customvariable9] [varchar](40) COLLATE Latin1_General_CI_AS NULL,
[customvariable10] [varchar](40) COLLATE Latin1_General_CI_AS NULL,
[accountnumber] [varchar](40) COLLATE Latin1_General_CI_AS NULL,
[callerentereddigits] [varchar](40) COLLATE Latin1_General_CI_AS NULL,
[badcalltag] [char](1) COLLATE Latin1_General_CI_AS NULL,
[transfer] [bit] NULL,
[NextSeqNum] [smallint] NULL,
[redirect] [bit] NULL,
[conference] [bit] NULL,
[flowout] [bit] NULL,
[metservicelevel] [bit] NULL,
[campaignid] [int] NULL,
[origprotocolcallref] [varchar](32) COLLATE Latin1_General_CI_AS NULL,
[destprotocolcallref] [varchar](32) COLLATE Latin1_General_CI_AS NULL,
[convertedStartDatetimelocal] [datetime2](7) NULL,
[convertedEndDatetimelocal] [datetime2](7) NULL,
[AltKey] AS (concat([sessionid],[sessionseqnum],[nodeid],[profileid]) collate database_default) PERSISTED NOT NULL,
[PrvSeqNum] [smallint] NULL,
CONSTRAINT [PK_contactcalldetail] PRIMARY KEY CLUSTERED
(
[sessionid] ASC,
[sessionseqnum] ASC,
[nodeid] ASC,
[profileid] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
/****** Object: Table [dbo].[contactqueuedetail] Script Date: 1/10/2019 9:10:04 AM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[contactqueuedetail](
[sessionid] [decimal](18, 0) NOT NULL,
[sessionseqnum] [smallint] NOT NULL,
[profileid] [int] NOT NULL,
[nodeid] [smallint] NOT NULL,
[targetid] [int] NOT NULL,
[targettype] [smallint] NOT NULL,
[targetTypeDescription] [varchar](10) COLLATE Latin1_General_CI_AS NULL,
[qindex] [smallint] NOT NULL,
[queueorder] [smallint] NOT NULL,
[disposition] [smallint] NULL,
[dispositionDescription] [varchar](50) COLLATE Latin1_General_CI_AS NULL,
[metservicelevel] [bit] NULL,
[queuetime] [smallint] NULL,
CONSTRAINT [PK_contactqueuedetail] PRIMARY KEY CLUSTERED
(
[sessionid] ASC,
[sessionseqnum] ASC,
[profileid] ASC,
[nodeid] ASC,
[targetid] ASC,
[targettype] ASC,
[qindex] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
/****** Object: Index [<Name of Missing Index, sysname,>] Script Date: 1/10/2019 9:10:04 AM ******/
CREATE NONCLUSTERED INDEX [<Name of Missing Index, sysname,>] ON [dbo].[contactcalldetail]
(
[convertedStartDatetimelocal] ASC
)
INCLUDE ( [sessionid],
[sessionseqnum],
[nodeid],
[profileid]) 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
/****** Object: Index [idx_CCD_ContactType_DestType_StDtLocal] Script Date: 1/10/2019 9:10:04 AM ******/
CREATE NONCLUSTERED INDEX [idx_CCD_ContactType_DestType_StDtLocal] ON [dbo].[contactcalldetail]
(
[destinationtype] ASC,
[contacttype] ASC,
[convertedStartDatetimelocal] ASC
)
INCLUDE ( [sessionid],
[sessionseqnum],
[nodeid],
[profileid],
[convertedEndDatetimelocal]) 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
SET ANSI_PADDING ON
GO
/****** Object: Index [idx_CQD_Profile_Traget_TargetType] Script Date: 1/10/2019 9:10:04 AM ******/
CREATE NONCLUSTERED INDEX [idx_CQD_Profile_Traget_TargetType] ON [dbo].[contactqueuedetail]
(
[profileid] ASC,
[targetid] ASC,
[targettype] ASC
)
INCLUDE ( [targetTypeDescription],
[queueorder],
[disposition],
[dispositionDescription],
[queuetime]) 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