Refresh VS Rescan VS Rebuild

Once a source is created, you can schedule or manually apply different source update types to maintain the source up-to-date with the system or to apply source configuration changes (see Refresh, Rescan, or Rebuild Sources and Schedule Source Updates).

The three update types attempt to catch and re-index changes for both:

Update type Scanned items Re-indexing Resource impact
Content Permissions

Only items identified by the source system as content or permission changes since the last update.

Refresh is not available for all sources, and when it is, it may have limitations like not catching all types of changes (deleted items, permission changes, etc.).

All scanned All scanned Small
Rescan All Only items found to have changed Only permissions found to have changed Medium
Rebuild All All All Large