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    <p>Regarding your first point, the contrib module "pg_buffercache" allows you to inspect the contents of the buffer cache. I like to define this:</p> <pre><code>create or replace view util.buffercache_hogs as select case when pg_buffercache.reldatabase = 0 then '- global' when pg_buffercache.reldatabase &lt;&gt; (select pg_database.oid from pg_database where pg_database.datname = current_database()) then '- database ' || quote_literal(pg_database.datname) when pg_namespace.nspname = 'pg_catalog' then '- system catalogues' when pg_class.oid is null and pg_buffercache.relfilenode &gt; 0 then '- unknown file ' || pg_buffercache.relfilenode when pg_namespace.nspname = 'pg_toast' and pg_class.relname ~ '^pg_toast_[0-9]+$' then (substring(pg_class.relname, 10)::oid)::regclass || ' TOAST'::text when pg_namespace.nspname = 'pg_toast' and pg_class.relname ~ '^pg_toast_[0-9]+_index$' then ((rtrim(substring(pg_class.relname, 10), '_index'))::oid)::regclass || ' TOAST index' else pg_class.oid::regclass::text end as key, count(*) as buffers, sum(case when pg_buffercache.isdirty then 1 else 0 end) as dirty_buffers, round(count(*) / (SELECT pg_settings.setting FROM pg_settings WHERE pg_settings.name = 'shared_buffers')::numeric, 4) as hog_factor from pg_buffercache left join pg_database on pg_database.oid = pg_buffercache.reldatabase left join pg_class on pg_class.relfilenode = pg_buffercache.relfilenode left join pg_namespace on pg_namespace.oid = pg_class.relnamespace group by 1 order by 2 desc; </code></pre> <p>Additionally, the "pageinspect" contrib module allows you to access a specific page from a relation, so I suppose you could simply loop through all the pages in a relation grabbing them?</p> <pre><code>select count(get_raw_page('information_schema.sql_features', n)) from generate_series(0, (select relpages-1 from pg_class where relname = 'sql_features')) n; </code></pre> <p>This will load all of <code>information_schema.sql_features</code> into the cache.</p>
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