Query Excution Process- Pros And Cons

Jun 15, 2006

vinod writes "Q1>Should I apply filter in sequence(based on primarykey,not null,comparision,between clause) ?

-How to apply filter in correct format,and SQL server internally execute it.
Q2>Should I use 'is not Null' to be put at the last?

Q3>Should I use 'between clause' rather than relation operator i.e(empid>10 and empid<200)

Q4>Does filters of sequence has any impact on the query execution process


table1[pkey1,col1,col2,col3] -->pkey is pkey1
table2[pkey2,pkey1,col11,col12,col13]--->pkey is pkey2, and pkey1 is foreign key

CaseI->select table2.pkey2,table1.col1 ,table2.col12
from table1 inner join table2
on table1.pkey1=table2.pkey1
where (table1.col3>100 and table1.col3<300 ) and table2.pkey1=2020 and table2.col13 is not null

CaseII->select table2.pkey2,table1.col1 ,table2.col12
from table1 inner join table2
on table1.pkey1=table2.pkey1
where (table1.col3 between 101 and 299 ) and pkey1=2020 and table2.col13 is not null"

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Hi All,

Any help regarding this very appreciated.

Problem:


I have a tough situation of trying to execute multiple instance of same package, to reduce the process load times.

Introduction:


We have src system which get 7000 tiny files of 72 rows each, and the SSIS package uses For Each Loop task and iterates through each file and loads data. We have a Process table that keeps track of the status of the SRC Process & ETL Load Process.

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

Table_PK      DATE             CITY                    SrcProcStatus       ETLStatus

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

1                   03/17/2007     Abingdon               Queued              Queued
2                   03/17/2007     Albion                    Queued              Queued           
3                   03/17/2007     Aledo                     Queued              Queued
4                   03/17/2007     Altamont                Queued              Queued
5                   03/17/2007     Alton                     Queued               Queued
6                   03/17/2007     Amboy                  Queued               Queued
7                   03/17/2007     Anna                     Queued               Queued
8                   03/17/2007     Antioch                 Queued               Queued
9                   03/17/2007     Arcola                   Queued               Queued
10                 03/17/2007     Arlington Heights    Queued               Queued
11                 03/17/2007     Ashley                   Queued               Queued
....              ....
11                 03/17/2007     Zeigler                   Queued                Queued
11                 03/17/2007     Zion                       Queued                Queued

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


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So to bring down the processing times, we wanted to start the SSIS packages in the Bridge table instead of starting in the share folder. i.e. for each row in the bridge where SRCProcess is Complete & ETLProcess Queued, start the SSIS process for this src file. Since our SRC files are names as "CityName_Date.csv" it will not be difficult. So we wanted to start multiple threads, that way the load process will be fast.
Implementation:

In the T-SQL loop we wanted to use 'xp_cmdshell' and call DTEXEC utility with the src file name as variable. But the DTEXEC is a synchronous process, but I am looking for a way to implement this asyncronously. Just like using "nohup executionscript &" in unix.
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Hi Guys,



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