Auto task - Gather Stats.How do Oracle knows which DB objects to analyze ?

Hi,
Do oracle has any specific criteria while identifying which Oracle DB objects needs to be analyze as part of Gather Stats ( included as "auto task") ?
Does it uses information from DBA_TAB_MODIFICATIONS to find any fixed % of change like 10% or so or it analyzes all objects ?

Copied and pasted from the documentation, which you can find via some simple Google searches if you don't know about http://docs.oracle.com
GATHER AUTO: Gathers all necessary statistics automatically. Oracle implicitly determines which objects need new statistics, and determines how to gather those statistics. When GATHER AUTO is specified, the only additional valid parameters are stattab,statid, objlist and statown; all other parameter settings are ignored. Returns a list of processed objects.
GATHER STALE: Gathers statistics on stale objects as determined by looking at the *_tab_modifications views. Also, return a list of objects found to be stale.
GATHER EMPTY: Gathers statistics on objects which currently have no statistics. Return a list of objects found to have no statistics.
14.2.1 GATHER_STATS_JOB
Optimizer statistics are automatically gathered with the job GATHER_STATS_JOB. This job gathers statistics on all objects in the database which have:
Missing statistics
Stale statistics

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/* Formatted on 2011/02/04 21:59 (Formatter Plus v4.8.8) */
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