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anil 007anil 007 

what is batch apex and scheduled apex



I have an req in which i have to handle batch and schedule apex classes


can any one explain me about this things






Batch Apex


A developer can now employ batch Apex to build complex, long-running processes on the platform. For example, a developer could build an archiving solution that runs on a nightly basis, looking for records past a certain date and adding them to an archive. Or a developer could build a data cleansing operation that goes through all Accounts and Opportunities on a nightly basis and reassigns them if necessary, based on custom criteria.

Batch Apex is exposed as an interface that must be implemented by the developer.


Batch jobs can be programmatically invoked at runtime using Apex.


You can only have five queued or active batch jobs at one time. You can evaluate your current count by viewing the Scheduled Jobs page in or programmatically using the Web services API to query the AsyncapexJob object.


To use batch Apex, you must write an Apex class that implements the interface Database.Batchable , and then invoke the class programmatically.                           


Apex Scheduler


To invoke Apex classes to run at specific times, first implement the Schedulable interface for the class, then specify the schedule using either the Schedule Apex page in the user interface, or the System.schedule method.