sql server query running slow from java

Question

I have a java program that runs a bunch of queries against an sql server database. The first of these, which queries against a view returns about 750k records. I can run t

Answer 1

Sometimes it could be due to the way parameters are binding to the query object. I found the following code is very slow when executing from java program.

Query query = em().createNativeQuery(queryString)                    
                .setParameter("param", SomeEnum.DELETED.name())

Once I remove the "deleted" parameter and directly append that "DELETED" string to the query, it became super fast. It may be due to that SQL server is expecting to have all the parameters bound to decide the optimized plan.