Apex Developer Guide

Getting Started
Writing Apex
Ways to Invoke Apex
Finishing Touches
Debugging Apex
Testing Apex
Deploying Apex
Using Change Sets To Deploy Apex
Using the Force.com IDE to Deploy Apex
Using the Force.com Migration Tool
Using SOAP API to Deploy Apex
Distributing Apex Using Managed Packages
Reference
Appendices
Glossary
PDF

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Deploying Apex

You can't develop Apex in your Salesforce production org. Live users accessing the system while you're developing can destabilize your data or corrupt your application. Instead, do all your development work in either a sandbox or a Developer Edition org.

You can deploy Apex using:

Any deployment of Apex is limited to 5,000 code units of classes and triggers.