Task of auto - Stats.How collect Oracle knows what DB objects to analyze?
Hello
Oracle has specific criteria identifying what the objects are Oracle DB must be analyzed in the framework to collect Stats (included as "automatic spot")?
It is using information from DBA_TAB_MODIFICATIONS to find any % fixed change as 10% or more or it scans all objects?
Copied and pasted in the documentation, you can find via some simple Google search if you are unsure http://docs.oracle.com
GATHER
AUTO
: Includes all necessary statistics automatically. Oracle implicitly determines between the need of new statistics and determines how to collect these statistics. When GATHER AUTO
is specified, the only valid additional parameters are stattab
, statid
, objlist
and statown
; all other parameters are ignored. Returns a list of objects processed.
GATHER
STALE
: Collects statistics on obsolete objects as determined by looking at the * _tab_modifications
views. In addition, return a list of objects that are found to be flawed.
GATHER
EMPTY
: Collects statistics on objects that currently have no statistics. Return the list of lost and found to have no statistics.
14.2.1 GATHER_STATS_JOB
Optimizer statistics are automatically collected with the work GATHER_STATS_JOB
. This work collects statistics on all objects in the database who have:
- Missing statistics
- Out-of-date statistics
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