mark/bret, thanks for the response.
sorry for not being more specific.
maybe i should have asked : what kind of lock(s) does dbcc checkstorage, dbcc checkverify, update (index) statistics put on a database/table.
where i work i remember a couple of instances where a database dump was being blocked by update stats or reorg. or it was the other way round. i don't remember exactly how it was.
bret, thanks for that pointer about how reorg rebuild works in new versions. will look it up. for the options - forwarded rows and reclaim space - are exclusive locks held on the relevant pages?
appreciate the feedback.