Eclipse indexing - what do the various options do -

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when right-click > index on project there few options:

  1. rebuild
  2. freshen files
  3. update modified files
  4. re-resolve unresolved includes

i've been hitting rebuild everytime i'm working on huge project , can't afford that; when modify file, whether it's .cpp or .h, need know 'index' operation do.

for each of 'index' options:

  1. what precisely do?
  2. what cost (relative memory, cpu time)?

documentation eclipse helpful searched , didn't find any.


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