如何使用一个命令删除SQL数据库中的所有索引？

Question

那么,如何使用一个命令删除SQL数据库中的所有索引？我有这个命令可以获取所有20个左右的drop语句,但是如何从这个"结果集"中运行所有这些drop语句？

select * from vw_drop_idnex;

给我相同列表的另一个变体是:

SELECT  'DROP INDEX ' + ix.Name + ' ON ' + OBJECT_NAME(ID)  AS QUERYLIST
FROM  sysindexes ix
WHERE   ix.Name IS NOT null and ix.Name like '%pre_%'

我试图做"exec(从vw_drop_idnex中选择cmd)"并且它不起作用.我正在寻找像for循环一样的东西,并逐个运行查询.

-----------------------

在Rob Farleys的帮助下,脚本的最终草案是:

declare @ltr nvarchar(1024);
SELECT @ltr = ( select 'alter table '+o.name+' drop constraint '+i.name+';'
  from sys.indexes i join sys.objects o on  i.object_id=o.object_id
  where o.type<>'S' and is_primary_key=1
  FOR xml path('') );
exec sp_executesql @ltr;

declare @qry nvarchar(1024);
select @qry = (select 'drop index '+o.name+'.'+i.name+';'
  from sys.indexes i join sys.objects o on  i.object_id=o.object_id
  where o.type<>'S' and is_primary_key<>1 and index_id>0
for xml path(''));
exec sp_executesql @qry

Answer 1

你很近.

declare @qry nvarchar(max);
select @qry = 
(SELECT  'DROP INDEX [' + ix.name + '] ON ' + OBJECT_NAME(ID) + '; '
FROM  sysindexes ix
WHERE   ix.Name IS NOT null and ix.Name like '%prefix_%'
for xml path(''));
exec sp_executesql @qry

Answer 2

这对我有用,我们跳过sys索引和constaints

declare @qry nvarchar(max);
select @qry = (

    select  'IF EXISTS(SELECT * FROM sys.indexes WHERE name='''+ i.name +''' AND object_id = OBJECT_ID(''['+s.name+'].['+o.name+']''))      drop index ['+i.name+'] ON ['+s.name+'].['+o.name+'];  '
    from sys.indexes i 
        inner join sys.objects o on  i.object_id=o.object_id
        inner join sys.schemas s on o.schema_id = s.schema_id
    where o.type<>'S' and is_primary_key<>1 and index_id>0
    and s.name!='sys' and s.name!='sys' and is_unique_constraint=0
for xml path(''));

exec sp_executesql @qry

Answer 3

来自:Stephen Hill的Bloggie

DECLARE @indexName VARCHAR(128)
DECLARE @tableName VARCHAR(128)

DECLARE [indexes] CURSOR FOR

        SELECT          [sysindexes].[name] AS [Index],
                        [sysobjects].[name] AS [Table]

        FROM            [sysindexes]

        INNER JOIN      [sysobjects]
        ON              [sysindexes].[id] = [sysobjects].[id]

        WHERE           [sysindexes].[name] IS NOT NULL 
        AND             [sysobjects].[type] = 'U'
        --AND               [sysindexes].[indid] > 1

OPEN [indexes]

FETCH NEXT FROM [indexes] INTO @indexName, @tableName

WHILE @@FETCH_STATUS = 0
BEGIN
        --PRINT 'DROP INDEX [' + @indexName + '] ON [' + @tableName + ']'
        Exec ('DROP INDEX [' + @indexName + '] ON [' + @tableName + ']')

        FETCH NEXT FROM [indexes] INTO @indexName, @tableName
END

CLOSE           [indexes]
DEALLOCATE      [indexes]

GO