Which DBMS_WORKLOAD_REPOSITORY procedure can modify the default retention period for performance data?

The procedure that can modify the default retention period for performance data in the DBMS_WORKLOAD_REPOSITORY package is MODIFY_SNAPSHOT_SETTINGS. This procedure specifically allows changes to the settings of snapshot data, including the retention period, which defines how long performance data is kept in the repository.

By utilizing this procedure, database administrators can adjust the retention policy to align with their performance management needs, whether to retain data for a longer period for historical analysis or to limit storage usage by shortening the retention time.

The other procedures listed do not pertain to modifying retention settings. For instance, UPDATE_OBJECT_INFO is used to update information about objects in the workload repository but does not deal with retention settings. MODIFY_BASELINE_WINDOW_SIZE is focused on adjusting window sizes for baselines, and CREATE_BASELINE_TEMPLATE is used for creating templates for baselines, neither of which impact how long performance data is retained.