Which two statements are true about a segment as defined in the Oracle Analytics Cloud machine learning functionality?

The data loads for your Essbase cube are taking many hours, due to which the cube is unavailable to the user for extended periods every day. You are assigned the task of optimizing the data load process.
Which are four optimization steps?

You have created a visualization of revenue data over time. It displays some seasonality (e.g. high revenue around typical holiday periods) but there is no obvious pattern to the data overall. In which two ways can you start to get insight from this data?

Which statement Is false about log files generated by Oracle BI Analyses?