Sql server 2008 SQL Server 2008:索引中的页数
我试图调查每个索引的页数,并制定了以下查询:Sql server 2008 SQL Server 2008:索引中的页数,sql-server-2008,indexing,b-tree-index,Sql Server 2008,Indexing,B Tree Index,我试图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('surrogatekey
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
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
此表的创建方式如下:
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100000行随机数据
我希望看到两个条目:用于唯一约束的非聚集索引和用于主键列的聚集索引
这些双重输入意味着什么 这意味着您的
加入
条件错误-您还需要在加入
条件中包含索引id
-如下所示:
INNER JOIN
sys.indexes as i ON pyi.object_id = i.object_id
AND pyi.index_id = i.index_id
一个简单的问题,也许是一个愚蠢的问题:如果sys.dm_db_index_physical_stats的第一个查询返回6行,为什么连接只返回4行?我本以为它会返回未完成联接中的所有6行。