Salesforce Certified Data Architecture Practice Test

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What tool should be used to identify performance issues in a long-running SOQL query within a Lightning component?

Use Splunk to query the system logs looking for transaction time and CPU usage.
Enable and use the query plan tool in the developer console.
Use Salesforce's query optimizer to analyze the query in the developer console.
Open a ticket with Salesforce support to retrieve transaction logs to analyze for processing time.

The correct answer is: Enable and use the query plan tool in the developer console.

The query plan tool in the developer console is specifically designed to analyze the execution plan of SOQL queries in Salesforce. It allows developers to gain insights into how Salesforce processes their queries, including which indexes are being used, and provides an estimate of the query execution time. By using this tool, developers can identify potential performance issues, such as missing indexes or inefficient query structures that could lead to slow execution. By enabling this tool, developers can assess the query's performance characteristics before executing it, helping them make informed decisions on how to optimize the query for better performance. This makes it particularly useful for diagnosing issues in long-running SOQL queries within Lightning components, where performance is critical for user experience and responsiveness. Splunk and Salesforce support options do not directly allow for proactive analysis of query performance in real-time scenarios. Salesforce's query optimizer is a component of the execution plan analysis but is not a separate tool like the query plan tool. Thus, the query plan tool provides the most appropriate approach for diagnosing and addressing performance issues with SOQL queries.