当我执行此操作时，起初速度不错，但现在要花很长时间，速度很慢。我不知道为什么，但是我想也许我应该清除缓存。
我想说大约需要1天，但还没有完成20％。
实际上，它大约在数据库SELECT中的TABLE上的[spt]和另一个数据库INSERT中的[AB_Warehouse]上，但是它们都在一个服务器上。
注意：在数据库[spt]中提交了一个，我们有这样的数据
“ aa + tt + bb + rr + yy”，我使用函数StringSplitXML进行了拆分，并且每个函数都插入了[Workspaces_Tbl] Level1 ... 15
这是我的查询：
USE [spt]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
BEGIN
DECLARE @ID decimal(20, 0);
DECLARE @parent_id decimal(20, 0);
DECLARE @Type int;
DECLARE @workspacetype_id decimal(10, 0);
DECLARE @isvirtual decimal(1, 0);
DECLARE @enable decimal(1, 0);
DECLARE @Level1 nvarchar(MAX);
DECLARE @Level2 nvarchar(MAX);
DECLARE @Level3 nvarchar(MAX);
DECLARE @Level4 nvarchar(MAX);
DECLARE @Level5 nvarchar(MAX);
DECLARE @Level6 nvarchar(MAX);
DECLARE @Level7 nvarchar(MAX);
DECLARE @Level8 nvarchar(MAX);
DECLARE @Level9 nvarchar(MAX);
DECLARE @Level10 nvarchar(MAX);
DECLARE @Level11 nvarchar(MAX);
DECLARE @Level12 nvarchar(MAX);
DECLARE @Level13 nvarchar(MAX);
DECLARE @Level14 nvarchar(MAX);
DECLARE @Level15 nvarchar(MAX);
DECLARE @titles_tmp nvarchar(MAX);
DECLARE @cont_spilit_tittle int;
DECLARE @parent_titles_tmp nvarchar(MAX);
DECLARE @cont_tmp int;
DECLARE @cont int;
SELECT @cont = COUNT(*) FROM septa.dbo.workspaces;
SET @cont_tmp = 0;
While(@cont_tmp<@cont)
BEGIN
SET @ID = (SELECT spt.dbo.workspaces.workspace_id FROM septa.dbo.workspaces ORDER BY workspace_id ASC OFFSET @cont_tmp ROWS FETCH NEXT 1 ROWS ONLY)
SET @parent_id = (SELECT septa.dbo.workspaces.parent_id FROM septa.dbo.workspaces ORDER BY workspace_id ASC OFFSET @cont_tmp ROWS FETCH NEXT 1 ROWS ONLY)
SET @workspacetype_id = (SELECT septa.dbo.workspaces.workspacetype_id FROM septa.dbo.workspaces ORDER BY workspace_id ASC OFFSET @cont_tmp ROWS FETCH NEXT 1 ROWS ONLY)
SET @isvirtual = (SELECT septa.dbo.workspaces.isvirtual FROM septa.dbo.workspaces ORDER BY workspace_id ASC OFFSET @cont_tmp ROWS FETCH NEXT 1 ROWS ONLY)
SET @enable = (SELECT septa.dbo.workspaces.enable FROM septa.dbo.workspaces ORDER BY workspace_id ASC OFFSET @cont_tmp ROWS FETCH NEXT 1 ROWS ONLY)
SET @titles_tmp = (SELECT septa.dbo.workspaces.title FROM septa.dbo.workspaces ORDER BY workspace_id ASC OFFSET @cont_tmp ROWS FETCH NEXT 1 ROWS ONLY)
SET @parent_titles_tmp = (SELECT septa.dbo.workspaces.parent_titles FROM septa.dbo.workspaces ORDER BY workspace_id ASC OFFSET @cont_tmp ROWS FETCH NEXT 1 ROWS ONLY)
IF OBJECT_ID('tempdb..#MyTempTable') IS NOT NULL DROP TABLE #MyTempTable
SELECT IDENTITY(int, 1, 1) AS 'RowID',* into #MyTempTable
FROM StringSplitXML(@parent_titles_tmp,'+')
insert into #MyTempTable VALUES (@titles_tmp)
SET @cont_spilit_tittle = (SELECT COUNT(*) FROM #MyTempTable)
IF(@cont_spilit_tittle<0)SET @cont_spilit_tittle = 1
SET @Type = @cont_spilit_tittle
WHILE(@cont_spilit_tittle < 15)
BEGIN
insert into #MyTempTable VALUES ('')
SET @cont_spilit_tittle = CAST(@cont_spilit_tittle AS INT) + 1
END
SET @Level1 = (SELECT Value FROM #MyTempTable ORDER BY RowID ASC OFFSET 0 ROWS FETCH NEXT 1 ROWS ONLY)
SET @Level2 = (SELECT Value FROM #MyTempTable ORDER BY RowID ASC OFFSET 1 ROWS FETCH NEXT 1 ROWS ONLY)
SET @Level3 = (SELECT Value FROM #MyTempTable ORDER BY RowID ASC OFFSET 2 ROWS FETCH NEXT 1 ROWS ONLY)
SET @Level4 = (SELECT Value FROM #MyTempTable ORDER BY RowID ASC OFFSET 3 ROWS FETCH NEXT 1 ROWS ONLY)
SET @Level5 = (SELECT Value FROM #MyTempTable ORDER BY RowID ASC OFFSET 4 ROWS FETCH NEXT 1 ROWS ONLY)
SET @Level6 = (SELECT Value FROM #MyTempTable ORDER BY RowID ASC OFFSET 5 ROWS FETCH NEXT 1 ROWS ONLY)
SET @Level7 = (SELECT Value FROM #MyTempTable ORDER BY RowID ASC OFFSET 6 ROWS FETCH NEXT 1 ROWS ONLY)
SET @Level8 = (SELECT Value FROM #MyTempTable ORDER BY RowID ASC OFFSET 7 ROWS FETCH NEXT 1 ROWS ONLY)
SET @Level9 = (SELECT Value FROM #MyTempTable ORDER BY RowID ASC OFFSET 8 ROWS FETCH NEXT 1 ROWS ONLY)
SET @Level10 = (SELECT Value FROM #MyTempTable ORDER BY RowID ASC OFFSET 9 ROWS FETCH NEXT 1 ROWS ONLY)
SET @Level11 = (SELECT Value FROM #MyTempTable ORDER BY RowID ASC OFFSET 10 ROWS FETCH NEXT 1 ROWS ONLY)
SET @Level12 = (SELECT Value FROM #MyTempTable ORDER BY RowID ASC OFFSET 11 ROWS FETCH NEXT 1 ROWS ONLY)
SET @Level13 = (SELECT Value FROM #MyTempTable ORDER BY RowID ASC OFFSET 12 ROWS FETCH NEXT 1 ROWS ONLY)
SET @Level14 = (SELECT Value FROM #MyTempTable ORDER BY RowID ASC OFFSET 13 ROWS FETCH NEXT 1 ROWS ONLY)
SET @Level15 = (SELECT Value FROM #MyTempTable ORDER BY RowID ASC OFFSET 14 ROWS FETCH NEXT 1 ROWS ONLY)
INSERT INTO [AB_Warehouse].[dbo].[Workspaces_Tbl]
([ID]
,[parent_id]
,[Type]
,[workspacetype_id]
,[isvirtual]
,[enable]
,[Level1]
,[Level2]
,[Level3]
,[Level4]
,[Level5]
,[Level6]
,[Level7]
,[Level8]
,[Level9]
,[Level10]
,[Level11]
,[Level12]
,[Level13]
,[Level14]
,[Level15])
VALUES
(
@ID,
@parent_id,
@Type,
@workspacetype_id,
@isvirtual,
@enable,
@Level1,
@Level2,
@Level3,
@Level4,
@Level5,
@Level6,
@Level7,
@Level8,
@Level9,
@Level10,
@Level11,
@Level12,
@Level13,
@Level14,
@Level15
)
SET @cont_tmp = CAST(@cont_tmp AS INT) + 1
END
RETURN
END
答案 0 :(得分：4)
作为思考如何解决此问题的方法的提示。
select t.id, t.title, l.*
from test t
cross apply (
select
p.cnt [Level-Count],
ISNULL(p.[Level-1], '') [Level-1],
ISNULL(p.[Level-2], '') [Level-2],
ISNULL(p.[Level-3], '') [Level-3],
ISNULL(p.[Level-4], '') [Level-4]
from (
select
s.value,
'Level-' + cast(row_number() over (order by (select 1)) as varchar(10)) rn,
count(*) over () - CASE WHEN t.parent_list = '' THEN 1 ELSE 0 END cnt
from STRING_SPLIT(
t.parent_list
+ CASE WHEN t.parent_list = '' THEN '' ELSE '+' END
+ cast(t.id as varchar(10))
+ CASE WHEN t.parent_list = '' THEN '+' ELSE '' END
, '+'
) s
) s
pivot (
max(s.value) for s.rn in (
[Level-1],
[Level-2],
[Level-3],
[Level-4])
) p
) l
类似的东西可以替换您发布的整个脚本。 为了分批处理这些数据，可能仍保留一些循环。但是大部分代码都是不必要的（临时表等）。
| id | title | Level-Count | Level-1 | Level-2 | Level-3 | Level-4 |
|----|--------------|-------------|---------|---------|---------|---------|
| 1 | item 1 | 1 | 1 | | | |
| 2 | item 1/2 | 2 | 1 | 2 | | |
| 3 | item 3 | 1 | 3 | | | |
| 4 | item 3/4 | 2 | 3 | 4 | | |
| 5 | item 3/4/5 | 3 | 3 | 4 | 5 | |
| 6 | item 3/4/5/6 | 4 | 3 | 4 | 5 | 6 |
| 7 | item 2/7 | 3 | 1 | 2 | 7 | |
| 8 | item 8 | 1 | 8 | | | |