CREATE OR REPLACE VIEW bloat ASSELECTschemaname, tablename, reltuples::bigint, relpages::bigint, otta,ROUND(CASE WHEN otta=0 THEN 0.0 ELSE sml.relpages/otta::numeric END,1) AS tbloat,relpages::bigint - otta AS wastedpages,bs*(sml.relpages-otta)::bigint AS wastedbytes,pg_size_pretty((bs*(relpages-otta))::bigint) AS wastedsize,iname, ituples::bigint, ipages::bigint, iotta,ROUND(CASE WHEN iotta=0 OR ipages=0 THEN 0.0 ELSE ipages/iotta::numeric END,1) AS ibloat,CASE WHEN ipages < iotta THEN 0 ELSE ipages::bigint - iotta END AS wastedipages,CASE WHEN ipages < iotta THEN 0 ELSE bs*(ipages-iotta) END AS wastedibytes,CASE WHEN ipages < iotta THEN pg_size_pretty(0::bigint) ELSE pg_size_pretty((bs*(ipages-iotta))::bigint) END AS wastedisizeFROM (SELECTschemaname, tablename, cc.reltuples, cc.relpages, bs,CEIL((cc.reltuples*((datahdr+ma-(CASE WHEN datahdr%ma=0 THEN ma ELSE datahdr%ma END))+nullhdr2+4))/(bs-20::float)) AS otta,COALESCE(c2.relname,'?') AS iname, COALESCE(c2.reltuples,0) AS ituples, COALESCE(c2.relpages,0) AS ipages,COALESCE(CEIL((c2.reltuples*(datahdr-12))/(bs-20::float)),0) AS iotta -- very rough approximation, assumes all colsFROM (SELECTma,bs,schemaname,tablename,(datawidth+(hdr+ma-(case when hdr%ma=0 THEN ma ELSE hdr%ma END)))::numeric AS datahdr,(maxfracsum*(nullhdr+ma-(case when nullhdr%ma=0 THEN ma ELSE nullhdr%ma END))) AS nullhdr2FROM (SELECTschemaname, tablename, hdr, ma, bs,SUM((1-null_frac)*avg_width) AS datawidth,MAX(null_frac) AS maxfracsum,hdr+(SELECT 1+count(*)/8FROM pg_stats s2WHERE null_frac<>0 AND s2.schemaname = s.schemaname AND s2.tablename = s.tablename) AS nullhdrFROM pg_stats s, (SELECT(SELECT current_setting('block_size')::numeric) AS bs,CASE WHEN substring(v,12,3) IN ('8.0','8.1','8.2') THEN 27 ELSE 23 END AS hdr,CASE WHEN v ~ 'mingw32' THEN 8 ELSE 4 END AS maFROM (SELECT version() AS v) AS foo) AS constantsGROUP BY 1,2,3,4,5) AS foo) AS rsJOIN pg_class cc ON cc.relname = rs.tablenameJOIN pg_namespace nn ON cc.relnamespace = nn.oid AND nn.nspname = rs.schemanameLEFT JOIN pg_index i ON indrelid = cc.oidLEFT JOIN pg_class c2 ON c2.oid = i.indexrelid) AS smlWHERE sml.relpages - otta > 0 OR ipages - iotta > 10ORDER BY wastedbytes DESC, wastedibytes DESC;