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我正在尝试调查每个索引的页数，并制定了以下查询： 

SELECT              
        pyi.index_type_desc as [index type],
        i.name as [index name],
        sum(pyi.page_count) as [number of pages]
FROM 
    sys.dm_db_index_physical_stats(DB_ID('testdb'),OBJECT_ID('surrogatekeys'),NULL,NULL,'DETAILED') as pyi
INNER JOIN 
    sys.indexes as i ON pyi.object_id = i.object_id     
GROUP BY 
    i.name, pyi.index_type_desc

当我运行此查询时，我得到以下结果：

CLUSTERED INDEX PK_TableWithSurrogateKeyAndUniqueContraints 14342
CLUSTERED INDEX UNIQUE_TableWithSurrogateKeyAndUniqueContraints 14342
NONCLUSTERED INDEX  PK_TableWithSurrogateKeyAndUniqueContraints 707
NONCLUSTERED INDEX  UNIQUE_TableWithSurrogateKeyAndUniqueContraints 707

该表的创建如下：

CREATE TABLE [dbo].[SurrogateKeys]
(
    [Id] [int] IDENTITY(1,1) NOT NULL,
    [TimeStamp] [datetime2](7) NOT NULL,
    [Username] [nvarchar](20) NOT NULL, 
    [Message] [nvarchar](500) NULL,

    CONSTRAINT [PK_TableWithSurrogateKeyAndUniqueContraints] 
       PRIMARY KEY CLUSTERED ([Id]),
    CONSTRAINT [UNIQUE_TableWithSurrogateKeyAndUniqueContraints] 
       UNIQUE ([Username], [TimeStamp]),
) ON [PRIMARY]
GO

并填充了 100,000 行随机数据。

我希望看到两个条目：唯一约束的非聚集索引和主键列的聚集索引。

这些重复输入是什么意思？

4

1 回答 1

1

这意味着您的JOIN条件错误 - 您还需要index_id在您的JOIN条件中包括 - 如下所示：

INNER JOIN 
    sys.indexes as i ON pyi.object_id = i.object_id 
                      AND pyi.index_id = i.index_id
于 2014-09-29T13:26:19.723 回答