Salesforce Platform Developer Practice Exam

How can a developer avoid exceeding governor limits in an Apex Trigger?

1. By using a helper class invoked from multiple triggers.

2. By using Maps to hold data from query results.

3. By performing DML transactions on individual records.

4. By employing bulk processing in DML transactions.

The correct answer is: By using Maps to hold data from query results.

The correct answer showcases a crucial principle in Apex development: efficiency in data handling through the use of Maps. Using Maps to hold data from query results is particularly effective in minimizing the number of database queries executed. This approach not only optimizes performance but also plays a significant role in adhering to Salesforce's governor limits, particularly the limits on SOQL queries. In Apex, whenever you perform a SOQL query, you're drawing on governor limits related to the number of queries that can be executed within a single transaction. By utilizing Maps, developers can store query results in memory, allowing for quick lookups and reducing the need for repeated queries for the same data. This not only keeps the transaction within the governor limits but also enhances the execution speed of the trigger. When working with triggers, which can be invoked multiple times for bulk records, efficiency becomes paramount. By holding data in a Map, you can combine information and execute fewer queries, which is vital in bulk processing scenarios. This practice helps ensure that you don't exceed the limit on the number of total SOQL queries issued in a single transaction, thus maintaining the stability and performance of your application. In summary, using Maps for query results is an effective strategy to manage data efficiently in Apex triggers and keeps operations