Question

我在SQl Server 2008R2数据库中有一个大表（名为ECRM）。大约1200万条记录。我有一个插入临时表，大约需要30分钟。我的插入查询：

CREATE TABLE #TECRM(ID INT IDENTITY(1,1),
                           ECRITURE_ID_TECH INT,
                           MONTANT_DEBIT MONEY,
                           MONTANT_CREDIT MONEY,
                           ECRM_ID INT,
                           CG VARCHAR(20),
                           CAUX VARCHAR(20),
                           REF_EXTERNE NVARCHAR(100),
                           MVT_LIB NVARCHAR(255),
                           PRIMARY KEY (id)
                           )
INSERT INTO #TECRM WITH (TABLOCK)
SELECT  ECRT_ECR_ID_TECH,
        MONTANT_DEBIT,
        MONTANT_CREDIT,
        ECRM_ID,
        ECRM_CG,
        ECRM_CAUX,
        ECRM_REF,
        ECRM_MVT_LIB
FROM ECRM
JOIN ECRT
     ON ECRM_ECRITURE_ID = ECRT_ECR_ID_TECH

我在ECRT_ECR_ID_TECH上有一个索引，在ECRM_ECRITURE_ID上有另一个索引我还在ECRM_ID（表ECRM的主键）

上有一个聚簇索引

当我看到仅针对选择查询的估计执行计划时，聚集索引扫描成本为92％！

所以我认为我之前必须改进选择查询，但我不知道如何避免聚集索引扫描...（成本92％）

那么任何想法或建议？

感谢您帮助我!!

修改1 ：

Actual Execution Plan of SELECT query

编辑2 ：

CREATE TABLE ECRM(ECRM_ID INT IDENTITY(1,1) NOT NULL,
        ECRM_ECRITURE_ID INT,
        MONTANT_DEBIT MONEY NULL,
        MONTANT_CREDIT MONEY NULL,
        ECRM_CG VARCHAR(20),
        ECRM_CAUX VARCHAR(20),
        ECRM_REF NVARCHAR(100),
        ECRM_MVT_LIB VARCHAR(255),
         CONSTRAINT [PK_T_ECRM] PRIMARY KEY CLUSTERED 
        (
            ECRM_ID ASC
        )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
        ) ON [PRIMARY]

添加非固定索引

CREATE NONCLUSTERED INDEX [IX_ECRM_ECRITURE_ID] ON [ECRM]
  ([ECRM_ECRITURE_ID])
WITH (  PAD_INDEX = OFF,  STATISTICS_NORECOMPUTE = OFF )ON [PRIMARY]

表ECRT

CREATE TABLE ECRT(
ECRT_ID int IDENTITY(1,1) NOT NULL,
ECRT_ECR_ID_TECH INT,
ECRT_MVT_CONCATENE_TECH nvarchar(max) NULL,
ECRT_DATE_COMPTA datetime NULL,
ECRT_ABONNEMENT_ID_TECH int NULL,
ECRT_A_ANALYSER bit NULL,
ECRT_SC_ID_TECH int NULL,
ECRT_IMPORT_ID int NULL,
ECRT_SC_ID_NON_IDENTIFIE_TECH int NULL,
CONSTRAINT [PK_TSMCG_ECRITURE_TECH] PRIMARY KEY CLUSTERED 
(
    ECRT_ID ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]

添加非固定索引

CREATE NONCLUSTERED INDEX [IX_ECRT_ECR_ID_TECH] ON [ECRT]
  ([ECRT_ECR_ID_TECH])
WITH (  PAD_INDEX = OFF,  STATISTICS_NORECOMPUTE = OFF )ON [PRIMARY]

GO

Answer 1

IF OBJECT_ID('tempdb.dbo.#temp') IS NOT NULL
    DROP TABLE #temp
GO

SELECT
    ECRT_ECR_ID_TECH,
    MONTANT_DEBIT,
    MONTANT_CREDIT,
    ECRM_ID,
    ECRM_CG,
    ECRM_CAUX,
    ECRM_REF,
    ECRM_MVT_LIB
INTO #temp
FROM ECRM
JOIN ECRT ON ECRM_ECRITURE_ID = ECRT_ECR_ID_TECH

ALTER TABLE #temp ADD ID INT IDENTITY(1,1) PRIMARY KEY
GO

提高性能sql server插入

1 个答案: