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Ich verwende SQl-Server und ich habe eine Ansicht erstellt, die Daten aus einer anderen Ansicht aufrufen und die Leistung ist sehr langsam. Gibt es eine Möglichkeit, die Leistung zu verbessern?Verschachtelte Ansicht verlangsamt Leistung, Auf der Suche nach einer Möglichkeit, die Leistung zu verbessern
First View ist (diese Ansicht verwendet wird zur Verknüpfung von Tabellen und erstellen Flaggen)
ALTER VIEW [dbo].[VW_MCCSR_FLAGS_MP] AS
SELECT TB2.*,
----FLAGS FOR CSV (GF1)
CASE WHEN TB2.PAR_UL_01 IS NOT NULL AND TB2.ROW_ITEM = 'CSV (GF1)' THEN 1 ELSE 0 END AS CSV_GF1_PAR_UL_01_FLAG,
CASE WHEN TB2.NONPAR_UL_01 IS NOT NULL AND TB2.ROW_ITEM = 'CSV (GF1)' THEN 1 ELSE 0 END AS CSV_GF1_NONPAR_UL_01_FLAG,
CASE WHEN TB2.PAR_UL_19 IS NOT NULL AND TB2.ROW_ITEM = 'CSV (GF1)' THEN 1 ELSE 0 END AS CSV_GF1_PAR_UL_19_FLAG,
CASE WHEN TB2.NONPAR_UL_19 IS NOT NULL AND TB2.ROW_ITEM = 'CSV (GF1)' THEN 1 ELSE 0 END AS CSV_GF1_NONPAR_UL_19_FLAG,
CASE WHEN TB2.VUL_19 IS NOT NULL AND TB2.ROW_ITEM = 'CSV (GF1)' THEN 1 ELSE 0 END AS CSV_GF1_VUL_19_FLAG,
CASE WHEN TB2.UL_26 IS NOT NULL AND TB2.ROW_ITEM = 'CSV (GF1)' THEN 1 ELSE 0 END AS CSV_GF1_UL_26_FLAG,
CASE WHEN TB2.UL_67 IS NOT NULL AND TB2.ROW_ITEM = 'CSV (GF1)' THEN 1 ELSE 0 END AS CSV_GF1_UL_67_FLAG,
CASE WHEN TB2.UL_89 IS NOT NULL AND TB2.ROW_ITEM = 'CSV (GF1)' THEN 1 ELSE 0 END AS CSV_GF1_UL_89_FLAG,
CASE WHEN TB2.UL_94 IS NOT NULL AND TB2.ROW_ITEM = 'CSV (GF1)' THEN 1 ELSE 0 END AS CSV_GF1_UL_94_FLAG,
CASE WHEN TB2.VUL_94 IS NOT NULL AND TB2.ROW_ITEM = 'CSV (GF1)' THEN 1 ELSE 0 END AS CSV_GF1_VUL_94_FLAG,
CASE WHEN TB2.UL_102 IS NOT NULL AND TB2.ROW_ITEM = 'CSV (GF1)' THEN 1 ELSE 0 END AS CSV_GF1_UL_102_FLAG
FROM
(
SELECT DISTINCT 'CSV' AS REPORT_NAME, 'CSV (GF1)' AS ROW_ITEM,
CASE WHEN TB1.GL_REINSURANCE_CLASS_CODE IS NULL AND TB1.GL_Legal_ID_BK = 1 AND TB1.US_SOE_Group_Code LIKE 'UL' AND TB1.Par_Code = 4
THEN SUM(TB1.Cash_Surrender_Value_Amt) END AS PAR_UL_01,
CASE WHEN TB1.GL_REINSURANCE_CLASS_CODE IS NULL AND TB1.GL_Legal_ID_BK = 1 AND TB1.US_SOE_Group_Code LIKE 'UL' AND TB1.Par_Code = 2
THEN SUM(TB1.Cash_Surrender_Value_Amt) END AS NONPAR_UL_01,
CASE WHEN TB1.GL_REINSURANCE_CLASS_CODE IS NULL AND TB1.GL_Legal_ID_BK = 19 AND TB1.US_SOE_Group_Code LIKE 'UL' AND TB1.Par_Code = 4
THEN SUM(TB1.Cash_Surrender_Value_Amt) END AS PAR_UL_19,
CASE WHEN TB1.GL_REINSURANCE_CLASS_CODE IS NULL AND TB1.GL_Legal_ID_BK = 19 AND TB1.US_SOE_Group_Code LIKE 'UL' AND TB1.Par_Code = 2
THEN SUM(TB1.Cash_Surrender_Value_Amt) END AS NONPAR_UL_19,
CASE WHEN TB1.GL_REINSURANCE_CLASS_CODE IS NULL AND TB1.GL_Legal_ID_BK = 19 AND TB1.US_SOE_Group_Code LIKE 'VUL' AND TB1.Par_Code = 2
THEN (SUM(TB1.Cash_Surrender_Value_Amt) - SUM(TB1.SEPERATE_ACCOUNT_VALUE)) END AS VUL_19,
CASE WHEN TB1.GL_REINSURANCE_CLASS_CODE IS NULL AND TB1.GL_Legal_ID_BK = 26 AND TB1.US_SOE_Group_Code LIKE 'UL' AND TB1.Par_Code = 2
THEN 0 END AS UL_26,
CASE WHEN TB1.GL_REINSURANCE_CLASS_CODE IS NULL AND TB1.GL_Legal_ID_BK = 94 AND TB1.US_SOE_Group_Code LIKE 'UL' AND TB1.Par_Code = 2
THEN (SUM(TB1.Cash_Surrender_Value_Amt)/0.09) END AS UL_67,
CASE WHEN TB1.GL_REINSURANCE_CLASS_CODE IS NULL AND TB1.GL_Legal_ID_BK = 89 AND TB1.US_SOE_Group_Code LIKE 'UL' AND TB1.Par_Code = 2
THEN SUM(TB1.Cash_Surrender_Value_Amt) END AS UL_89,
CASE WHEN TB1.GL_REINSURANCE_CLASS_CODE IS NULL AND TB1.GL_Legal_ID_BK = 94 AND TB1.US_SOE_Group_Code LIKE 'UL' AND TB1.Par_Code = 2
THEN SUM(TB1.Cash_Surrender_Value_Amt) END AS UL_94,
CASE WHEN TB1.GL_REINSURANCE_CLASS_CODE IS NULL AND TB1.GL_Legal_ID_BK = 94 AND TB1.US_SOE_Group_Code LIKE 'VUL' AND TB1.Par_Code = 2
THEN (SUM(TB1.Cash_Surrender_Value_Amt) - SUM(TB1.SEPERATE_ACCOUNT_VALUE)) END AS VUL_94,
CASE WHEN TB1.GL_REINSURANCE_CLASS_CODE IS NULL AND TB1.GL_Legal_ID_BK = 102 AND TB1.US_SOE_Group_Code LIKE 'UL' AND TB1.Par_Code = 2
THEN SUM(TB1.Cash_Surrender_Value_Amt) END AS UL_102
FROM
(SELECT distinct PF.POLICY_SID, PF.Cash_Surrender_Value_Amt ,CAST(PD.GL_Legal_ID_BK AS INT) AS GL_Legal_ID_BK,PD.US_SOE_Group_Code , CAST(PD.Par_Code AS INT) AS Par_Code
,CAST(CD.GL_REINSURANCE_CLASS_CODE AS INT) AS GL_REINSURANCE_CLASS_CODE
, TBL1.FUND_BALANCE_AMT AS SEPERATE_ACCOUNT_VALUE
FROM POLICY_FACT PF
INNER JOIN Policy_DIM PD ON PF.Policy_SID = PD.Policy_SID
LEFT OUTER JOIN (SELECT DISTINCT crf.policy_sid , crf.coverage_sid FROM dbo.Coverage_rider_fact crf
WHERE CRF.Reporting_period_sid = (SELECT b.DATE_SID
FROM
[VSTPODS_US].[dbo].[REF_EXTRACT_MONTH] A
INNER JOIN
[dbo].date_dim b
ON
SUBSTRING(CAST(b.date_sid AS VARCHAR(8)),1,6) = A.EXTRACT_MONTH
WHERE A.CURR_IND=1 AND B.Last_Day_of_the_Month_Ind = 1)
) CURF
ON PD.Policy_SID = CURF.POLICY_SID
LEFT OUTER JOIN COVERAGE_DIM CD ON CURF.Coverage_SID = CD.Coverage_SID
LEFT OUTER JOIN (SELECT FF.policy_sid, FF.FUND_BALANCE_AMT,FD.Fund_Account_Type_Code FROM
dbo.Fund_Account_Fact FF
INNER JOIN dbo.Fund_Account_dim FD ON FF.Fund_Account_sid = FD.Fund_Account_sid
WHERE FD.Fund_Account_Type_Code = 'S' AND
FF.Reporting_Period_SID = (SELECT b.DATE_SID
FROM
[VSTPODS_US].[dbo].[REF_EXTRACT_MONTH] A
INNER JOIN
[dbo].date_dim b
ON
SUBSTRING(CAST(b.date_sid AS VARCHAR(8)),1,6) = A.EXTRACT_MONTH
WHERE A.CURR_IND=1 AND B.Last_Day_of_the_Month_Ind = 1)
) TBL1 ON TBL1.Policy_sid = PF.Policy_SID
WHERE PF.Reporting_Period_SID = (SELECT b.DATE_SID
FROM
[VSTPODS_US].[dbo].[REF_EXTRACT_MONTH] A
INNER JOIN
[dbo].date_dim b
ON
SUBSTRING(CAST(b.date_sid AS VARCHAR(8)),1,6) = A.EXTRACT_MONTH
WHERE A.CURR_IND=1 AND B.Last_Day_of_the_Month_Ind = 1)) AS TB1
GROUP BY TB1.GL_REINSURANCE_CLASS_CODE,TB1.GL_Legal_ID_BK,TB1.US_SOE_Group_Code, TB1.Par_Code) TB2
Ausgang dieser Ansicht ist wie dieser 
und das Skript des Aufrufs Ansicht ist
ALTER VIEW [dbo].[VW_MCCSR_USNT_OUTPUT_MP] AS
SELECT DISTINCT V1.REPORT_NAME, V1.ROW_ITEM,
(SELECT PAR_UL_01 FROM VW_MCCSR_FLAGS_MP WHERE CSV_GF1_PAR_UL_01_FLAG = 1) AS PAR_UL_01,
(SELECT NONPAR_UL_01 FROM VW_MCCSR_FLAGS_MP WHERE CSV_GF1_NONPAR_UL_01_FLAG = 1) AS NONPAR_UL_01,
(SELECT PAR_UL_19 FROM dbo.VW_MCCSR_FLAGS_MP WHERE CSV_GF1_PAR_UL_19_FLAG IS NOT NULL ) AS PAR_UL_19,
(SELECT NONPAR_UL_19 FROM VW_MCCSR_FLAGS_MP WHERE CSV_GF1_NONPAR_UL_19_FLAG = 1) AS NONPAR_UL_19,
(SELECT VUL_19 FROM VW_MCCSR_FLAGS_MP WHERE CSV_GF1_VUL_19_FLAG = 1) AS VUL_19,
(SELECT UL_26 FROM VW_MCCSR_FLAGS_MP WHERE CSV_GF1_UL_26_FLAG = 1 ) AS UL_26,
(SELECT UL_67 FROM VW_MCCSR_FLAGS_MP WHERE CSV_GF1_UL_67_FLAG = 1 ) AS UL_67,
(SELECT UL_89 FROM VW_MCCSR_FLAGS_MP WHERE CSV_GF1_UL_89_FLAG = 1 ) AS UL_89,
(SELECT UL_94 FROM VW_MCCSR_FLAGS_MP WHERE CSV_GF1_UL_94_FLAG = 1 ) AS UL_94,
(SELECT VUL_94 FROM VW_MCCSR_FLAGS_MP WHERE CSV_GF1_VUL_94_FLAG = 1) AS VUL_94 ,
(SELECT UL_102 FROM VW_MCCSR_FLAGS_MP WHERE CSV_GF1_UL_102_FLAG = 1) AS UL_102
FROM
VW_MCCSR_FLAGS_MP V1
WHERE V1.ROW_ITEM = 'CSV (GF1)'
Da Ihre '(PAR_UL_01' etc Felder nicht mit der tatsächlichen Zeile in der Ansicht verknüpft sind, können Sie max() + case nicht verwenden, um den Wert zu erhalten, anstatt zu wählen, um die gleiche Ansicht 12 mal zu sehen? –
Sie sollten den tatsächlichen Ausführungsplan angeben. Auf dieser Grundlage können Sie sehen, welche Teile verbessert werden können (durch Indizes, Ändern der SQL, usw.). – Igor
Einfach. Befreien Sie sich von den verschachtelten Ansichten. Das ist ein sicherer Weg, den Optimierer zu verwirren. Es scheint so eine logische Idee zu sein, aber verschachtelte Ansichten sind für die Performance schrecklich. Fügen Sie dazu die gleiche verschachtelte Ansicht immer wieder hinzu und Sie haben ein Rezept für ein Performance-Senke-Loch. Grant geht hier auf einige Details ein. https://www.simple-talk.com/sql/performance/the-seven-sins-against-tsql-performance/ Scrollen Sie etwa zur Hälfte in den Abschnitt verschachtelte Ansichten. –