Which system is primarily used to capture event information necessary for processing updates?

The primary function of an online transaction processing system (OLTP) is to capture event information as it occurs, allowing for immediate processing of transactions. These systems are designed to handle a high volume of transactions efficiently. They record individual transactions and update the database instantly, ensuring that the data reflects real-time activity, which is essential in environments that require timely and accurate processing, such as retail or banking.

In contrast, a data warehouse focuses on the storage and analysis of historical data rather than the immediate processing of events. Customer relationship management software is typically used for managing a company's interactions and relationships with customers, emphasizing data analysis and reporting rather than real-time transaction processing. Inventory management systems are specialized applications that manage stock levels and orders, but they may not capture event information in real-time like an OLTP system does. Thus, the primary use of OLTP systems aligns perfectly with the need to capture event information for processing updates in a timely manner.