However, you should control most Oracle Trace collections using the Oracle Trace Manager application. An event is the occurrence of some activity within a product. Oracle Trace collects data for specific, predefined events that occur within a software product that is instrumented with the Oracle Trace API, that is, embedded with Oracle Trace API calls. An example of a point event is an error occurrence. An example of a duration event is a transaction.
Items are specific pieces of information about an event.
If your product has been instrumented with Oracle Trace API calls, the developer has identified specific events and data items. These items, such as a transaction type or dollar amount, are specific to the instrumented product. For example, the Oracle Server release 7.3 and higher is instrumented for 13 events. This event records a large set of data such as sorts, reads, and cursor number. Data about the execution plan, such as SQL operation, position, object identification, and number of rows processed by a single row source within an execution plan.