列出所有索引

Question

我想知道列出数据库中所有表的所有索引的最简单方法是什么.

我应该调用sp_helpindex每个表并将结果存储在临时表中,还是有更简单的方法？

任何人都可以解释为什么约束存储在sysobjects但索引不存在？

Answer 1

以下是您需要的查询类型的示例:

select 
    i.name as IndexName, 
    o.name as TableName, 
    ic.key_ordinal as ColumnOrder,
    ic.is_included_column as IsIncluded, 
    co.[name] as ColumnName
from sys.indexes i 
join sys.objects o on i.object_id = o.object_id
join sys.index_columns ic on ic.object_id = i.object_id 
    and ic.index_id = i.index_id
join sys.columns co on co.object_id = i.object_id 
    and co.column_id = ic.column_id
where i.[type] = 2 
and i.is_unique = 0 
and i.is_primary_key = 0
and o.[type] = 'U'
--and ic.is_included_column = 0
order by o.[name], i.[name], ic.is_included_column, ic.key_ordinal
;

这个有点特定于某个目的(我在一个小的C#应用​​程序中使用它来查找重复索引并格式化输出,因此它实际上是人类可读的).但您可以轻松地根据您的需求进行调整.

Answer 2

你可以参考sysindexes

另一个技巧是查看sp_helpindex的文本,以了解它如何从基础表重构信息.

sp_helptext 'sp_helpindex'

我没有这方面的参考,但我相信约束不存储在sysobjects中,因为它们是一种不同的东西; sysindexes包含有关sysobjects中对象的元数据.

Answer 3

如果您需要更多信息，这里有一个不错的 SQL 脚本，我不时使用它：

DECLARE @TabName varchar(100)

CREATE TABLE #temp (
   TabName varchar(200), IndexName varchar(200), IndexDescr varchar(200), 
   IndexKeys varchar(200), IndexSize int
)

DECLARE cur CURSOR FAST_FORWARD LOCAL FOR
    SELECT name FROM sysobjects WHERE xtype = 'U'

OPEN cur

FETCH NEXT FROM cur INTO @TabName
WHILE @@FETCH_STATUS = 0
    BEGIN
        INSERT INTO #temp (IndexName, IndexDescr, IndexKeys)
        EXEC sp_helpindex @TabName

        UPDATE #temp SET TabName = @TabName WHERE TabName IS NULL

        FETCH NEXT FROM cur INTO @TabName
    END

CLOSE cur
DEALLOCATE cur

DECLARE @ValueCoef int
SELECT @ValueCoef = low FROM Master.dbo.spt_values WHERE number = 1 AND type = N'E'

UPDATE #temp SET IndexSize = 
    ((CAST(sysindexes.used AS bigint) * @ValueCoef)/1024)/1024
        FROM sysobjects INNER JOIN sysindexes ON sysobjects.id = sysindexes.id
            INNER JOIN #temp T ON T.TabName = sysobjects.name AND T.IndexName = sysindexes.name

SELECT * FROM #temp
ORDER BY TabName, IndexName 

DROP TABLE #temp