Apex Developer Guide

Apex Developer Guide
Getting Started with Apex
Writing Apex
Running Apex
Invoking Apex
Apex Transactions and Governor Limits
Apex Transactions
Execution Governors and Limits
Set Up Governor Limit Email Warnings
Running Apex within Governor Execution Limits
Using Salesforce Features with Apex
Integration and Apex Utilities
Debugging, Testing, and Deploying Apex
Apex Language Reference
Appendices
Glossary
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Apex Transactions and Governor Limits

Apex Transactions ensure the integrity of data. Apex code runs as part of atomic transactions. Governor execution limits ensure the efficient use of resources on the Force.com multitenant platform.

Most of the governor limits are per transaction, and some aren’t, such as 24-hour limits.

To make sure Apex adheres to governor limits, certain design patterns should be used, such as bulk calls and foreign key relationships in queries.