小编jhs*_*ets的帖子

现有的表结构

CREATE TABLE [MYTABLE](
    [ROW1] [numeric](18, 0) NOT NULL,
    [ROW2] [numeric](18, 0) NOT NULL,
    [ROW3] [numeric](18, 0) NOT NULL,
    [ROW4] [numeric](18, 0) NULL,
    CONSTRAINT [MYTABLE_PK] PRIMARY KEY CLUSTERED ([ROW1] ASC, [ROW2] ASC, [ROW3] ASC)
)

该表有2个非聚集索引,以及以下统计信息:

RowCount:    5260744
Data Space:  229.609 MB
Index Space: 432.125 MB

我想减小索引的大小,并使用代理主键作为聚簇索引,而不是自然复合键.

新表结构

CREATE TABLE [dbo].[TEST_RUN_INFO](
    [ROW1] [numeric](18, 0) NOT NULL,
    [ROW2] [numeric](18, 0) NOT NULL,
    [ROW3] [numeric](18, 0) NOT NULL,
    [ROW4] [numeric](18, 0) NULL,
    [ID] [int] IDENTITY(1,1) NOT NULL,
    CONSTRAINT [MYTABLE_PK] PRIMARY KEY CLUSTERED …