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Development with the Force.com Platform: Building Business Applications in the Cloud, Third Edition by Jason Ouellette

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Limits of Batch Apex

You must keep in mind several important limits of Batch Apex:

Image Future methods are not allowed anywhere in Batch Apex.

Image Batch jobs are always run as the system user, so they have permission to read and write all data in the organization.

Image The maximum heap size in Batch Apex is 12MB.

Image Calling out to external systems using the HTTP ...

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