Is there documentation on the synchronization options, specifically the second and third ones?

Synchronize LDAP data with Drupal profiles:

  • When user logs in. (Use when LDAP rarely changes.)
  • On each page load.
  • Every time user object loaded in Drupal. (May cause high LDAP traffic.)

Comments

cgmonroe’s picture

cgmonroe commented
Status: Active » Closed (fixed)

Clearing out old support requests - reopen if problem still exists in newest code

That said..

They really are self documented...

user login - Drupal info is updated from LDAP when user logs on.
page load - If user information is needed, the Drupal info is updated from LDAP when the first load_user() call on a page is made, other calls to get the same user info are not.
every time - If user information is loaded multiple times in generating a page display, LDAP will be queried each time.