Per una funzionalità di ricerca sto usando una vista che ha i record di tutte le tabelle all'interno delle quali devo cercare. La vista ha quasi 20 milioni di record. Le ricerche in questa prospettiva richiedono troppo tempo.
Dove devo cercare per migliorare le prestazioni di questa vista?
La definizione approssimativa per la vista è di seguito. Comprende tredici tavoli e una trentina di campi.
CREATE VIEW [dbo].[v_AllForSearch]
AS
SELECT
FT.firstField AS [firstField]
, FT.fld_primary AS [fld_primary]
, FT.fld_thirdField AS [thirdField]
, FT.fld_fourthField AS [fourthField]
, ISNULL(ST.[fld_firstSearchField],'') AS [firstSearchField]
, ISNULL(TT.[fld_thirdSearch],'') AS thirdSearch
, ISNULL(TT.[fld_fourthSearch],'')AS fourthSearch
, ISNULL(TT.[fld_fifthSearch],'')AS fifthSearch
, ISNULL(FRT.[fld_sixthSearch],'') As [sixthSearch]
, ISNULL(FRT.[fld_seventhSearch],'') AS [seventhSearch]
, ISNULL(FRT.[fld_eightSearch],'')AS [eightSearch]
, ISNULL(FIT.[fld_nineSearch],'') AS [nineSearch]
, ISNULL(SIT.[fld_tenthSearch],'')AS [tenthSearch]
, ISNULL(SET.[fld_eleventhSearch],'') AS [eleventhSearch]
, ISNULL(ET.[twelthSearch],'')AS [twelthSearch]
, ISNULL(NT.[thirteenthSearch],'')AS [thirteenthSearch]
, ISNULL(NT.[fourteenSearch],'') AS [fourteenSearch]
, ISNULL(NT.[fifteenSearch],'') AS [fifteenSearch]
, ISNULL(NT.[sxteenSearch],'') AS [sxteenSearch]
, ISNULL(NT.[seventeenSearch],'') AS [seventeenSearch]
, ISNULL(NT.[eighteenSearch],'')AS [eighteenSearch]
, ISNULL(TT.[ninteenSearch],'') AS [ninteenSearch]
, ISNULL(ELT.[twentySearch],'') AS [twentySearch]
, ISNULL(ELT.[twentyOneSearch],'') AS [twentyOneSearch]
, ISNULL(TWT.[twentyTwoSearch],'') AS [twentyTwoSearch]
, ISNULL(THT.twentyThree,'') AS [twentyThree]
, ISNULL(THT.twentyFour,'') AS [twentyFour]
, ISNULL(THT.twentyFive,'') AS [twentyFive]
, ISNULL(THT.twentySix,'') AS [twentySix]
FROM
tblFirstTable AS FT
LEFT JOIN [tblSecondTable] AS ST
ON ST.[fld_primary] = FT.[fld_primary]
LEFT JOIN [tblThirdTable] AS TT
ON TT.[fld_primary] = FT.[fld_primary]
LEFT JOIN [tblFourthTable] AS FRT
ON FRT.[fld_primary] = FT.[fld_primary]
LEFT JOIN [tblFifthTable] AS FIT
ON FIT.[fld_primary] = FT.[fld_primary]
LEFT JOIN [tblSixthTable] AS SIT
ON SIT.[fld_primary] = FT.[fld_primary]
LEFT JOIN [tblSeventhTable] AS SET
ON SET.[fld_primary] = FT.[fld_primary]
LEFT JOIN [tblEighthTable] AS ET
ON ET.[fld_primary] = FT.[fld_primary]
LEFT JOIN [tblNinthTable] AS NT
ON NT.[fld_primary] = FT.[fld_primary]
LEFT JOIN [tblELTnthTable] AS TT
ON TT.[fld_primary] = FT.[fld_primary]
LEFT JOIN [tblEleventhTable] AS ELT
ON ELT.[fld_primary] = FT.[fld_primary]
LEFT JOIN [tblTwelthTable] AS TWT
ON TWT.[fld_id] = ELT.[fld_id]
LEFT JOIN [tblThirteenthTable] AS THT
ON THT.[firstField]= FT.[firstField]
WHERE fld_Status ..