To verify the functionality of your Apex code, execute unit tests. You can run Apex test methods in the Developer Console, in Setup, in the Force.com IDE, or using the API.
Use methods from the “Limits” to monitor governor limits
Use SOQL for loops to iterate data retrieved from queries that return a high number of rows
Developers should always use a SOQLforloop to process query results that return many records, to avoid the limit onheap ...
The API name is not changed and there are no other impacts.
Any top-level Apex class that has a default, no-argument constructor
A custom controller is an Apex class that uses the default, no-argument constructor for the outer, top-level class. You cannot create a custom controller constructor that includes parameters.
B.Change set from sandbox D.Force.com IDE E.Metadata API