Why Parallelism not showing in actual execution plan ?

I am using SQL Server 2012. Why Parallelism  not showing in my actual execution plan ?
Varshini SAsked:
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Russell FoxDatabase DeveloperCommented:
My guess is that the optimizer calculated that your query would not benefit from parallel operations.
Anthony PerkinsCommented:
Are your setting MAXDOP to 1 or is SQL Server configured that way?
Varshini SAuthor Commented:
Russel , I am executing same query in another server it is showing  Parallelism . But it is not in my computer and I am using SQL server 2012 express edition.
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Varshini SAuthor Commented:
Anthony - I did not use MAXDOP  in my query.
Anthony PerkinsCommented:
I am executing same query in another server it is showing  Parallelism .
Why would you assume the queries would be the same?  In fact the same query on the same server could have different execution plans with different data.

So why don't you tell us what is the real problem?  Do you think the lack of performance of the query is due to the fact that  parallelism is/ is not showing up in the execution plan?
Varshini SAuthor Commented:
Anthony, I have restore the same database in the two servers and executed the same Query.

I want to how to set the Parallelism. Does Parallelism  slow down the SQL performance ?
Varshini SAuthor Commented:
SQL Server Express 2012 Parallelism settings:

Cost Threshold for Parallelism=5
max degree of parallelism =0

Machine has 4 cores and 8 logical processors
Anthony PerkinsCommented:
I want to how to set the Parallelism.
Read up on the MAXDOP query hint.

Does Parallelism  slow down the SQL performance ?
It really depends.

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