使用索引提示和连接提示

Question

（提问时间：。抱歉，我需要查看我的 post）。

我需要在连接中添加提示（在连接时强制使用 ID 上的索引），在 select 上（强制对 where 子句使用名称上的索引），如本 post 中提到的最后一个查询。我不知道正确连接（用于调整）的正确语法是什么，force index 的正确语法是什么，where 子句将使用它，而我 select 从视图中查看。

我在sql服务器2012中创建了一个视图，例如：

create myview as
select mytable2.name
from mytable1 t1
join myTable2 t2
on t1.id = t2.id

我希望连接表 1 和表 2 具有正确的索引 (id)，但是当我这样做时：

select * from myview
where name = 'abcd'

我希望最后一个 select 包含列 'name' 的索引。

如我所述，sql 带提示（调整）的服务器中的正确语法是什么？运行？

我想强制使用索引仅用于连接目的（列 = id），并在执行时强制使用索引名称：

select name from myview 
where name = 'abcd'.

类似

create myview as
select mytable2.name
/* index hint name on  column name */
from mytable1 t1
join myTable2 t2
/* index hint name on  column id - just for join */
on t1.id = t2.id

我不想强迫最终用户在执行视图时使用视图添加提示 - 只需为他提供带有适当索引提示的视图即可。（或者，如果不可能 - 我该怎么做）。

需要样品，请。

我有这样一个简单的视图（无论基于什么表......它对我工作的公司来说都是非常明确的。这是 Microsoft Dynamics AX 2012+ 一些额外的表）。

create view [dbo].[splSqlAltItemsView]
as
select i_orig.dataareaid, id_orig.inventsiteid, i_orig.itemid, i_alt.itemid altItemId,
orig_item.minTollerance, orig_item.maxTollerance
from 
(
select orig_item.recid,
c_grade.value as grade,
c_materialFamily.value as MaterialFamily,
c_shape.value as shape,
c_thickness.value as thickness,
convert(real, isnull(c_minTollerance.value, 0.00)) as minTollerance,
convert(real, isnull(c_maxTollerance.value, 0.00)) as maxTollerance
from
(select e0.recid
from ECORESPRODUCT e0
where e0.recid in 
(
select productid
from CMAPRODUCTATTRIBUTEVALUES c0
where name in ('Grade', 'Material Family', 'Shape', 'Thickness')
and productid > 0
group by productid
having count(1) = 4
)) orig_item
join CMAPRODUCTATTRIBUTEVALUES c_grade
on c_grade.PRODUCTID = orig_item.RECID
and c_grade.name = 'Grade'
join CMAPRODUCTATTRIBUTEVALUES c_materialFamily
on c_materialFamily.PRODUCTID = orig_item.RECID
and c_materialFamily.name = 'Material Family'
join CMAPRODUCTATTRIBUTEVALUES c_shape
on c_shape.PRODUCTID = orig_item.RECID
and c_shape.name = 'Shape'
join CMAPRODUCTATTRIBUTEVALUES c_thickness
on c_thickness.PRODUCTID = orig_item.RECID
and c_thickness.name = 'Thickness'
left join CMAPRODUCTATTRIBUTEVALUES c_minTollerance
on c_minTollerance.PRODUCTID = orig_item.RECID
and c_minTollerance.name = 'Min Tollerance'
left join CMAPRODUCTATTRIBUTEVALUES c_maxTollerance
on c_minTollerance.PRODUCTID = orig_item.RECID
and c_minTollerance.name = 'Max Tollerance'
) orig_item
join 
(select alt_item.recid,
c_grade.value as grade,
c_materialFamily.value as MaterialFamily,
c_shape.value as shape,
c_thickness.value as thickness,
convert(real, isnull(c_minTollerance.value, 0.00)) as minTollerance,
convert(real, isnull(c_maxTollerance.value, 0.00)) as maxTollerance
from
(select e0.recid
from ECORESPRODUCT e0
where e0.recid in 
(
select productid
from CMAPRODUCTATTRIBUTEVALUES c0
where name in ('Grade', 'Material Family', 'Shape', 'Thickness')
and productid > 0
group by productid
having count(1) = 4
)) alt_item
join CMAPRODUCTATTRIBUTEVALUES c_grade
on c_grade.PRODUCTID = alt_item.RECID
and c_grade.name = 'Grade'
join CMAPRODUCTATTRIBUTEVALUES c_materialFamily
on c_materialFamily.PRODUCTID = alt_item.RECID
and c_materialFamily.name = 'Material Family'
join CMAPRODUCTATTRIBUTEVALUES c_shape
on c_shape.PRODUCTID = alt_item.RECID
and c_shape.name = 'Shape'
join CMAPRODUCTATTRIBUTEVALUES c_thickness
on c_thickness.PRODUCTID = alt_item.RECID
and c_thickness.name = 'Thickness'
left join CMAPRODUCTATTRIBUTEVALUES c_minTollerance
on c_minTollerance.PRODUCTID = alt_item.RECID
and c_minTollerance.name = 'Min Tollerance'
left join CMAPRODUCTATTRIBUTEVALUES c_maxTollerance
on c_minTollerance.PRODUCTID = alt_item.RECID
and c_minTollerance.name = 'Max Tollerance'
) alt_item 
on alt_item.grade = orig_item.grade
and alt_item.MaterialFamily = orig_item.MaterialFamily
and alt_item.shape = orig_item.shape
and (alt_item.thickness between orig_item.thickness - orig_item.minTollerance and orig_item.thickness + orig_item.maxTollerance or
  orig_item.thickness between alt_item.thickness - alt_item.minTollerance and alt_item.thickness + alt_item.maxTollerance)
join inventtable i_orig
on i_orig.product = orig_item.recid
join InventItemInventSetup is_orig
on is_orig.dataareaid = i_orig.dataareaid 
and is_orig.itemid = i_orig.itemid 
and is_orig.inventdimid = 'AllBlank'
join InventDim id_orig
on id_orig.DATAAREAID = is_orig.DATAAREAID
and id_orig.inventdimid = is_orig.inventdimiddefault
join inventtable i_alt
on i_alt.product = alt_item.recid
and i_alt.DATAAREAID = i_orig.DATAAREAID
join InventItemInventSetup is_alt
on is_alt.dataareaid = i_alt.dataareaid 
and is_alt.itemid = i_alt.itemid 
and is_alt.inventdimid = 'AllBlank'
join InventDim id_alt
on id_alt.DATAAREAID = is_alt.DATAAREAID
and id_alt.inventdimid = is_alt.inventdimiddefault
and id_alt.inventsiteid = id_orig.inventsiteid

当我这样做时：

select * from splSqlAltItemsView
where itemid = '12345'

非常耗时，连inventTable都有itemid的索引

当我这样做时：

 select * from splSqlAltItemsView

视图是运行s 秒。

Answer 1

我相信你知道通常使用提示是一个坏主意，它应该只在非常特殊的情况下使用，但是......

create myview as
select mytable2.name
from mytable1 t1 WITH (INDEX(index_name1))
join myTable2 t2
WITH (INDEX(index_name2))
on t1.id = t2.id

使用索引提示和连接提示

Use index hint and join hint

sql-server

join

join-hints