There is another technical question that contains two parts; the first being a how which is a process question the next being a when which is it clarifying question. You're reminded to answer every part of a question which an interviewer asks, especially with a technically-oriented interview. Doing this demonstrates both your listening skills as well as your attention to detail.

"The tables in a data migration process are analyzed by reviewing the statistics generated using the analyze command. The same statistics can be used by a cost-based optimizer to create a data retrieval plan. The analyze statement also supports the creation of the object's structures, space management, and other operations within the data warehouse tables. The tables are analyzed either when the index table is created or when the cluster is complete."