select instance_name from apm_packages where package_id = :package_id select count(*) from rss_gen_subscrs s, acs_sc_impls i, weblogger_channels w where w.package_id = :package_id and s.summary_context_id = w.channel_id and s.impl_id = i.impl_id and i.impl_name = 'pinds_blog_entries' and i.impl_owner_name = 'lars-blogger'