elovkoff on "[Plugin: W3 Total Cache] Debug - explanation required"

1. I have enabled page cache and db cache

Page cache

<!-- W3 Total Cache: Page cache debug info:
Engine:             disk: enhanced
Cache key:          skylark-studio.com/_index.html
Caching:            enabled
Creation Time:      0.845s
Header info:
Link:                <http://wp.me/3DgOw>; rel=shortlink
Expires:             Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control:       no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma:              no-cache
Vary:
X-Pingback:           http://skylark-studio.com/xmlrpc.php
Content-Type:         text/html; charset=UTF-8
-->

Does that mean page cache is working?
Why it says then...?
Cache-Control: no-store, no-cache, must-revalidate, post-check=0

2. DB CACHE

<!-- W3 Total Cache: Db cache debug info:
Engine:             disk
Total queries:      47
Cached queries:     6
Total query time:   0.2245

Why only 6 cached queries?

The one that have disabled status look like this:
`1 | 0.1028 | disabled (Query is rejected) | not cached | 0 | SELECT option_name, option_value FROM wrd_options WHERE autoload = 'yes'
14 | 0.0001 | enabled | not cached | 537 | SELECT option_value FROM wrd_options WHERE option_name = '

and so on...

http://wordpress.org/extend/plugins/w3-total-cache/