ProgrammingPages

for your own objects, you may wish to provide a special string that may provide more useful information. To do this, simply define the 'toString' method:

not have to store individual copies of the methods for each instance of the object, so it may require less memory, but it will require the browser to search the current and parent scopes to find the methods. This may cause a marginal delay

Saying 'this.propertyname' as I did above will create a public property. Any script can create an object then use and modify its properties directly. Using 'var' to define a variable in the constructor will create a private property.

It does not cache the plan but full result sets

so it looks at first letter of the query and if it is “S” it proceeds with query lookup in cache if not - skips it.

Might not work with transactions

And really all they're doing in their implementation is automatically inserting those type casts for you. So you get the syntactic sugar, or some of it at least, but you don't get any of the execution efficiency

because Java's generics implementation relies on erasure of the type parameter, when you get to runtime, you don't actually have a faithful representation of what you had at compile time. When you apply reflection to a generic List in Java, you can't tell what the List is a List of.

C# does the instantiation at runtime.

With the above design, it takes six SQL Join operations to access and display the information about a single user. This makes rendering the profile page a fairly database intensive operation which is compounded by the fact that profile pages are the most popular pages on social networking sites.

Database denormalization is the kind of performance optimization that should be carried out as a last resort after trying things like creating database indexes, using SQL views and implementing application specific in-memory caching. However if you hit massive scale and are dealing with millions of queries a day across hundreds of millions to billions of records or have decided to go with database partitioning/sharding then you will likely end up resorting to denormalization

Denormalization means that you you are now likely to deal with data inconsistencies because you are storing redundant copies of data and may not be able to update all copies of a column value simultaneously  when it is changed for a variety of reasons. Having tools in your infrastructure to support fixing up data of this sort then become very important.

There's a lot of work being done by the Mozilla foundation and Adobe to integrate a killer JavaScript interpreter into both Flash and Firefox using Adobe's Tamarin engine