Question

Query is taking long time

Asked by: Mateen

Sql Server 2000

I have written a query.

It is working and it brings correct result.

It is taking some time and I feel that the query could be made faster.

The table vd 400,000 rows and the table chartofacc has 8000 rows.

Here is my query

select  acc_code = x.acc_code
            , acc_name = x.acc_name
            , Data = x.Data
            , UnitName = (Select company_abbr from company where company_code='01')
            , Group5 = x.group5
            , Group7 = x.group7
from
(
select distinct
         a.acc_code
       , acc_name  = (case levels
           when 2 then space(5)  + a.acc_name
           when 3 then space(10) + a.acc_name
           when 4 then space(15) + a.acc_name
           when 5 then space(20) + a.acc_name
            else a.acc_name  end)
      , Data= ( select TOP 1 1 from vd where vd.acc_code=a.acc_code and vd.company_code ='01')
      , Group5 = ( select TOP 1 1 from vd
                  where left(vd.acc_code,5) = left(a.acc_code,5) and vd.company_code ='01'
                  and len(a.acc_code)=5)
      , Group7 = ( select TOP 1 1 from vd
                  where left(vd.acc_code,7) = left(a.acc_code,7) and vd.company_code ='01'
                  and len(a.acc_code)=7)
from chartofacc a
where ( left(a.acc_code,2) in ('41','42','43','44','45','59'))
)x
where ( x.data = 1 or     (  isnull(x.group5,0)+isnull(x.group7,0)>0))

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Asked On
2007-01-25 at 02:02:34ID22136179
Tags

sql

,

long

,

time

,

query

,

taking

Topic

MS SQL Server

Participating Experts
1
Points
500
Comments
8

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Answers

 

by: angelIIIPosted on 2007-01-25 at 02:07:01ID: 18394189

I guess there are missing indexes in regards to your query.
what is the execution plan?

 

by: MateenPosted on 2007-01-25 at 02:18:01ID: 18394225

Hi angel

Index spool/eag         29% Filter 20 % Index =vd_ix_vd_acc_code
Index spool/eag         29% Filter 20% Index =vd_ix_vd_acc_code

 

by: MateenPosted on 2007-01-25 at 02:33:24ID: 18394285

In vd the length of acc_code is exactly 11, only group level.

Here is a picture of some data of only acc_code,acc_name brought by the above query.

acc_code          acc_name
41110                STORES AND SPARES - CLOSING STOCK
4111010                     OPENING STOCK STORES AND SPARES
41110100005                          Opening Stock Stores and Spares
4111011                     STORE INVENTORY ( PURCHASE )
41110110013                          Store Purchase (Local)
41120                PACKING MATERIALS-CLOSING STOCK
4112010                     OPENING STOCK PACKING MATERIAL
41120100005                          Opening Stock Packing Material
42110                YARN CLOSING STOCK SDM
4211010                     YARN OPENING STOCK
42110100005                          Opening Stock Yarn
42120                DYES AND CHEMICAL CONSUMED
4212010                     OPENING STOCK DYES AND CHEMICAL
42120100004                          Dyes & Chemical Purchase (Local)
42120100005                          Opening Stock Dyes & Chemical
43110                WORK IN PROCESS CLOSING STOCK
4311010                     WORK IN PROCESS CLOSING STOCK
43110100005                          Work in Process Closing Stock
44110                FINISHED STOCK SDM
4411010                     OPENING STOCK FINISHED GOODS
44110100001                          Opening Stock Finished Goods
44115                FINISHED STOCK - STPL
4411510                     CLOSING STOCK - STPL
44115100005                          Closing Stock - Tinplate
59110                STORES AND SPARES - CLOSING STOCK
5911020                     STORE PURCHASES
59110200005                          Store Purchases (Local)
59110200010                          Store Purchases (Imported)
59110200011                          Air & Oil filters Group (Imported)
59110200999                          Closing Stock Store & Spares
59110209999                          Discount Store Purchase (Local Purchase)
5911025                     Store Purchase Inter Co.
59110250005                          G. I. Sheets - Inter Co. (Tinplate)


 

by: angelIIIPosted on 2007-01-25 at 02:39:15ID: 18394313

can you upload the execution plan picture somewhere (www.ee-stuff.com), please?

 

by: MateenPosted on 2007-01-25 at 03:07:40ID: 18394437

 

by: MateenPosted on 2007-01-25 at 03:16:47ID: 18394480

 

by: angelIIIPosted on 2007-01-25 at 03:32:03ID: 18394548

as you can see on the execution plan, you have a clustered index scan on the 2 tables, which return huge arrows, which get filtered later to return only few rows (small arrow). so you don't have appropriate indexes

I have to assume that this comes from this pare:
where left(vd.acc_code,5) = left(a.acc_code,5) and vd.company_code ='01'

the left() function will make it impossible to use a normal index.
you should think about either splitting the 2 fields into 2x2 fields, by putting the 5 first characters to the first field and the rest to the second field.
if you want the full acc_code field to maintain, drop it once you made the split, and add it as computed field.
you can then index the 2 parts (or, the first field), and make the query/join using that field.

alternatively, you could add a computed field to the table that returns only the 5 first characters of acc_code, and put a simple index on that computed field. then, change the query to do the join using that field.

the performance should get better dramatically.

 

by: MateenPosted on 2007-01-25 at 03:46:23ID: 18394605

Hi angel

Fortunately I already have computer columns on each label. I only need to create index on them and change the query so that the function left is removed. I will manage now.

Thanks.

20120131-EE-VQP-002

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