SLOW VIEW (1 reply)

Hi,
my name is Niccolò Benvenuti, from Italy.( I'm sorry for my English!).
My problem:
I distrubute an ERP software for small industry (5 to 50 connection/clients). This software can use Sqlserver or Mysql.
I prefere to install mysql. The problems are the views!
There are same views constructed in this mode:
(select ....... ) union all ( select .......) union all ( select ... )
I convert a database from sqlserver 2008R2 to mysql5.5 and run the same view.
The time of mysql is ten time bed and more!!
Time of sqlserver ( 180.000 rows ) il 3 seconds, mysql ( the same tables ) is 120 seconds.
Do you think that the problem could be the tuning of mysql ?
The others select have the same time between slqserver and mysql....
Thank to all!!
Niccolò