SQL 数据插入、删除 大数据

--测试表

CREATE TABLE [dbo].[Employee] (

    [EmployeeNo] INT PRIMARY KEY,

    [EmployeeName] [nvarchar](50) NULL,

    [CreateUser] [nvarchar](50) NULL,

    [CreateDatetime] [datetime] NULL

);

--1、循环插入

SET STATISTICS TIME ON;

DECLARE @Index INT = 1;

DECLARE @Timer DATETIME = GETDATE();

WHILE @Index <= 100000

BEGIN

    INSERT [dbo].[Employee](EmployeeNo, EmployeeName, CreateUser, CreateDatetime) VALUES(@Index, ‘Employee_‘ + CAST(@Index AS CHAR(6)), ‘system‘, GETDATE());

    SET @Index = @Index + 1;

END
SELECT DATEDIFF(MS, @Timer, GETDATE()) AS [执行时间(毫秒)];

SET STATISTICS TIME OFF;

--2、事务循环

BEGIN TRAN;

SET STATISTICS TIME ON;

DECLARE @Index INT = 1;

DECLARE @Timer DATETIME = GETDATE();

WHILE @Index <= 100000

BEGIN

    INSERT [dbo].[Employee](EmployeeNo, EmployeeName, CreateUser, CreateDatetime) VALUES(@Index, ‘Employee_‘ + CAST(@Index AS CHAR(6)), ‘system‘, GETDATE());

    SET @Index = @Index + 1;

END
SELECT DATEDIFF(MS, @Timer, GETDATE()) AS [执行时间(毫秒)];

SET STATISTICS TIME OFF;

COMMIT;
--3、批量插入

SET STATISTICS TIME ON;

DECLARE @Timer DATETIME = GETDATE();

INSERT [dbo].[Employee](EmployeeNo, EmployeeName, CreateUser, CreateDatetime)

SELECT TOP(100000) EmployeeNo = ROW_NUMBER() OVER (ORDER BY C1.[OBJECT_ID]), ‘Employee_‘, ‘system‘, GETDATE()

FROM SYS.COLUMNS AS C1 CROSS JOIN SYS.COLUMNS AS C2

ORDER BY C1.[OBJECT_ID]
SELECT DATEDIFF(MS, @Timer, GETDATE()) AS [执行时间(毫秒)];

SET STATISTICS TIME OFF;
--4、CET插入

SET STATISTICS TIME ON;

DECLARE @Timer DATETIME = GETDATE();

;WITH CTE(EmployeeNo, EmployeeName, CreateUser, CreateDatetime) AS(

    SELECT TOP(100000) EmployeeNo = ROW_NUMBER() OVER (ORDER BY C1.[OBJECT_ID]), ‘Employee_‘, ‘system‘, GETDATE()

    FROM SYS.COLUMNS AS C1 CROSS JOIN SYS.COLUMNS AS C2

    ORDER BY C1.[OBJECT_ID]

)

INSERT [dbo].[Employee] SELECT EmployeeNo, EmployeeName, CreateUser, CreateDatetime FROM CTE;
SELECT DATEDIFF(MS, @Timer, GETDATE()) AS [执行时间(毫秒)];

SET STATISTICS TIME OFF;
--5、循环删除

SET STATISTICS TIME ON;

DECLARE @Timer DATETIME = GETDATE();

DELETE FROM [dbo].[Employee];
SELECT DATEDIFF(MS, @Timer, GETDATE()) AS [执行时间(毫秒)];

SET STATISTICS TIME OFF;
--6、批量删除

SET STATISTICS TIME ON;

DECLARE @Timer DATETIME = GETDATE();

SET ROWCOUNT 100000;
WHILE 1 = 1

BEGIN

    BEGIN TRAN

    DELETE FROM [dbo].[Employee];

    COMMIT

    IF @@ROWCOUNT = 0

        BREAK;

END
SET ROWCOUNT 0;
SELECT DATEDIFF(MS, @Timer, GETDATE()) AS [执行时间(毫秒)];

SET STATISTICS TIME OFF;
--6、Truncate删除

SET STATISTICS TIME ON;

DECLARE @Timer DATETIME = GETDATE();

TRUNCATE TABLE [dbo].[Employee];
SELECT DATEDIFF(MS, @Timer, GETDATE()) AS [执行时间(毫秒)];

SET STATISTICS TIME OFF;

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