> Here is the latest output: > > ingentadb=# EXPLAIN ANALYZE select A0.Subj, A2.Obj From jena_g1t1_stmt A0, > jena_g1t1_stmt A1, jena_g1t1_stmt A2 Where > A0.Prop='Uv::http://prismstandard.org/namespaces/1.2/basic/isPartOf' AND > A0.Obj='Uv::http://www.utdallas.edu/~farhan.husain/IngentaConnect/issue1_1' > AND A0.GraphID=1 AND A0.Subj=A1.Subj AND > A1.Prop='Uv::http://www.w3.org/1999/02/22-rdf-syntax-ns#type' AND > A1.Obj='Uv::http://metastore.ingenta.com/ns/structure/Article' AND > A1.GraphID=1 AND A0.Subj=A2.Subj AND > A2.Prop='Uv::http://prismstandard.org/namespaces/1.2/basic/startingPage' AND > A2.GraphID=1; > > QUERY > PLAN > ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- > Merge Join (cost=799852.37..812767.47 rows=733195 width=134) (actual > time=5941553.710..5941569.192 rows=30 loops=1) > Merge Cond: ((a0.subj)::text = (a1.subj)::text) > -> Sort (cost=89884.41..89964.28 rows=31949 width=208) (actual > time=243.711..243.731 rows=30 loops=1) > Sort Key: a0.subj > Sort Method: quicksort Memory: 24kB > -> Nested Loop (cost=0.00..84326.57 rows=31949 width=208) (actual > time=171.255..232.765 rows=30 loops=1) > -> Index Scan using jena_g1t1_stmt_ixo on jena_g1t1_stmt a0 > (cost=0.00..5428.34 rows=487 width=74) (actual time=96.735..97.070 rows=30 > loops=1) > Index Cond: ((obj)::text = > 'Uv::http://www.utdallas.edu/~farhan.husain/IngentaConnect/issue1_1'::text) > Filter: (((prop)::text = > 'Uv::http://prismstandard.org/namespaces/1.2/basic/isPartOf'::text) AND > (graphid = 1)) > -> Index Scan using jena_g1t1_stmt_ixsp on jena_g1t1_stmt > a2 (cost=0.00..161.37 rows=51 width=134) (actual time=4.513..4.518 rows=1 > loops=30) > Index Cond: (((a2.subj)::text = (a0.subj)::text) AND > ((a2.prop)::text = > 'Uv::http://prismstandard.org/namespaces/1.2/basic/startingPage'::text)) > Filter: (a2.graphid = 1) > -> Materialize (cost=709967.96..723526.46 rows=1084680 width=74) > (actual time=5941309.876..5941318.552 rows=31 loops=1) > -> Sort (cost=709967.96..712679.66 rows=1084680 width=74) (actual > time=5941309.858..5941318.488 rows=31 loops=1) > Sort Key: a1.subj > Sort Method: external merge Disk: 282480kB > -> Seq Scan on jena_g1t1_stmt a1 (cost=0.00..456639.59 > rows=1084680 width=74) (actual time=0.054..44604.597 rows=3192000 loops=1) > Filter: ((graphid = 1) AND ((prop)::text = > 'Uv::http://www.w3.org/1999/02/22-rdf-syntax-ns#type'::text) AND > ((obj)::text = > 'Uv::http://metastore.ingenta.com/ns/structure/Article'::text)) > Total runtime: 5941585.248 ms > (19 rows) Can you do this: select * from pg_statistic where starelid = 'jena_g1t1_stmt'::regclass; Thanks, ...Robert -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
