When making the transition from standard development to cloud development on a platform like Force.com, there are some critical differences that force you to change how you would approach the project from the architecture stage all the way through the final testing stage. One of those differences is governor limits. Since the Force.com platform is built on a multi-tenant architecture, it relies on governor limits to ensure applications from one tenant don’t affect the performance of another tenant.
What are Governor Limits, and Why Do We Need Them?
According to Salesforce.com, governor limits are “runtime limits enforced by the Apex runtime engine to ensure that code does not misbehave” (Albert, n.d.). Governor limits are Salesforce.com’s way of making sure our code does not impact other tenants in the infrastructure. They affect almost every area of programming on the Force.com platform. From application logic such as how many script statements you can run, to memory management like heap size limits, to database query and DML limits.
Without governor limits, a multi-tenant architecture such as Force.com’s, could never work. Imagine a developer creating a simple class that ended up trying to loop through millions of records at runtime. The impact could be catastrophic to the other users of the system, since
they all share the same physical resources
Work With Governor Limits,Not Against Them.
From a developer’s view, governor limits can be very painful. There is nothing worse than getting 75% of the way through a project, only to find out through testing that it can’t support large numbers of records without hitting governor limits. You have to go all the way back
to architecture and try to figure out a way of handling the large quantities without losing any functionality, and in a
short time frame.
The best way to avoid this is to start your project with governor limits in mind. Before you start coding, figure out the size of the data set your application will be working with. Also, figure out how much other code will be in the environment. Your trigger may be well within the
governor limits when it runs, but if there are four other triggers on the same object, you may hit the limits when they are executed together. Unfortunately, you may not easily be able to calculate the resources that will be needed by managed applications from the AppExchange, so always make sure your development org has all of the applications installed that you intend to install into the production org. Another thing to keep in mind is the Avoiding Governor Limit Pitfalls on The Force.com Platform.
A number of people who will be using your application, as well as how often they will be using it. Some governor limits are on a timed basis or based off the amount of licenses in your organization, or both. Let’s look at a couple of the most troubling governor limits and ways
to get around them.
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