I’m using DBCR (ver 2.2.4) with WP 3.2.1 and WPSC 0.9.9.9 and I can’t tell if it’s working.
In WPSC settings I have “Don’t cache pages for known users. (Recommended)” checked.
When I am logged in, WP Super Cache turns off and I can see DB-C-R entries in the footer source:
<!-- Generated in 0.313 seconds. Made 11 queries to database and 22 cached queries. Memory used - 20.59MB -->
<!-- Cached by DB Cache Reloaded Fix -->
<!-- Dynamic page generated in 0.310 seconds. -->
<!-- Page not cached by WP Super Cache. Check your settings page. -->
But when I log out to test out WPSC, I only see the entry for WPSC:
<!-- Cached page generated by WP-Super-Cache on 2011-11-29 21:10:58 -->
<!-- Compression = gzip -->
So I have to assume DBCR isn’t operating at the same time as WPSC (I’d love to hear otherwise). It’s still partially useful because it will cache when WPSC isn’t.