java - Specific Query runs fine directly or when any change to it is made but in current state takes longer to run -

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major update after couple days of debugging:

i run few queries similar :

select rtrim(part) part  tablep pm  left join tables s on pm.id = s.id  inner join tablec cm on cm.id = pm.id  name = 'ngw'  ,  status not in ('nl', 'z')  group rtrim(part), isnull(s.value,0)  order isnull(s.value,0)

it run in java so:

    preparedstatement select = con.preparestatement(         "select rtrim(part) part" +         "from tablep pm " +         "left join tables s on pm.id= s.id " +         "inner join tablec cm on cm.id= pm.id " +         "where name =? ,  status not in ('nl', 'z') " +          "group rtrim(part), isnull(s.value,0) " +         "order isnull(s.value,0) " );     select.setstring(1, name);     resultset rs = select.executequery();     while(rs.next()){           ... data loaded...

the queries have been running fine inside of java application. 3 or 4 queries of form went taking less second on minute.

i have copied exact query sql profiler , when run directly on database preforms in less second. started make changes query , found change query return 1 second performance even adding single space between statement. returned original exact state take 60+ seconds.

core question: so, have fix, cause query run differently change small whitespace?

is possible execution plan corrupted? can try explicitly clearing plan cache? http://msdn.microsoft.com/en-us/library/aa175244(v=sql.80).aspx


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