Question

When there is a web app will query some information frequently, how to improve the performance by cache the query result?
(The information is like top news in a website and my database is SQL Server 2008, the application is on tomcat.)

Answer 1

I can suggest the following:

1. In your database you can use idex views, please check: How to mimick Oracle Materialized Views on MS SQL Server?.
2. If you has used JPA or Hibernate it can cache Entities (objects).
   • http://docs.jboss.org/hibernate/orm/3.3/reference/en/html/performance.html#performance-cache
   • http://en.wikibooks.org/wiki/Java_Persistence/Caching
3. If you’re looking for a cache system that is foreign to database and ORM, maybe you can review MemCache or EHCache.
   • http://memcached.org/
   • http://ehcache.org/
4. An option but not recommended is that you manage a cache in your application, by example you can store at ServletContext (also know as ApplicationContext) the list of Countries, but you need to implement the business logic for cache (update, delete and insert objects), also you need to be careful with the Heap Memory.

You can use a combination of the above strategies it depends of the context of your business

Best regards,

Ernesto.