Index: sql/perf/after_dossier_one.txt =================================================================== --- sql/perf/after_dossier_one.txt (revision 2853f2ebbc643ed265db27aa0af19878c14db48c) +++ sql/perf/after_dossier_one.txt (revision 2853f2ebbc643ed265db27aa0af19878c14db48c) @@ -0,0 +1,118 @@ +######## dossier_one ######## +Sort (cost=260.44..260.44 rows=1 width=167) (actual time=0.869..0.872 rows=1.00 loops=1) + Sort Key: (COALESCE((sum(s.awarded_credits)), '0'::bigint)) DESC, (COALESCE((round(avg(((ps.grade)::text)::integer), 2)), '0'::numeric)) DESC, u.index + Sort Method: quicksort Memory: 25kB + Buffers: shared hit=188 read=4 + -> Nested Loop Left Join (cost=23.45..260.43 rows=1 width=167) (actual time=0.841..0.846 rows=1.00 loops=1) + Buffers: shared hit=179 read=4 + -> Nested Loop Left Join (cost=19.14..254.96 rows=1 width=113) (actual time=0.729..0.733 rows=1.00 loops=1) + Buffers: shared hit=175 read=4 + -> Nested Loop Left Join (cost=14.54..203.24 rows=1 width=105) (actual time=0.300..0.303 rows=1.00 loops=1) + Buffers: shared hit=161 + -> Nested Loop Left Join (cost=9.64..116.19 rows=1 width=97) (actual time=0.246..0.249 rows=1.00 loops=1) + Buffers: shared hit=95 + -> Nested Loop Left Join (cost=5.33..97.71 rows=1 width=81) (actual time=0.231..0.233 rows=1.00 loops=1) + Buffers: shared hit=89 + -> Index Scan using users_pkey on users u (cost=0.28..8.30 rows=1 width=33) (actual time=0.013..0.014 rows=1.00 loops=1) + Index Cond: (id = 2500) + Filter: (role = 'student'::user_role) + Index Searches: 1 + Buffers: shared hit=3 + -> GroupAggregate (cost=5.05..89.39 rows=1 width=52) (actual time=0.216..0.217 rows=1.00 loops=1) + Buffers: shared hit=86 + -> Nested Loop (cost=5.05..89.13 rows=14 width=16) (actual time=0.078..0.175 rows=8.00 loops=1) + Buffers: shared hit=82 + -> Nested Loop (cost=4.90..86.81 rows=14 width=16) (actual time=0.074..0.160 rows=8.00 loops=1) + Buffers: shared hit=66 + -> Nested Loop (cost=4.61..80.15 rows=20 width=12) (actual time=0.055..0.102 rows=20.00 loops=1) + Buffers: shared hit=18 + -> Bitmap Heap Scan on enrolled_semesters es (cost=4.32..18.43 rows=4 width=8) (actual time=0.039..0.052 rows=4.00 loops=1) + Recheck Cond: (user_id = 2500) + Heap Blocks: exact=4 + Buffers: shared hit=6 + -> Bitmap Index Scan on enrolled_semesters_user_id_semester_id_key (cost=0.00..4.32 rows=4 width=0) (actual time=0.018..0.018 rows=4.00 loops=1) + Index Cond: (user_id = 2500) + Index Searches: 1 + Buffers: shared hit=2 + -> Index Scan using semesters_subjects_enrolled_semesters_id_subjects_id_key on semesters_subjects ss (cost=0.29..15.38 rows=5 width=12) (actual time=0.011..0.011 rows=5.00 loops=4) + Index Cond: (enrolled_semesters_id = es.id) + Index Searches: 4 + Buffers: shared hit=12 + -> Index Scan using passed_subjects_enrolled_id_key on passed_subjects ps (cost=0.29..0.33 rows=1 width=12) (actual time=0.003..0.003 rows=0.40 loops=20) + Index Cond: (enrolled_id = ss.id) + Index Searches: 20 + Buffers: shared hit=48 + -> Index Scan using subjects_pkey on subjects s (cost=0.15..0.17 rows=1 width=8) (actual time=0.001..0.001 rows=1.00 loops=8) + Index Cond: (id = ss.subjects_id) + Index Searches: 8 + Buffers: shared hit=16 + -> GroupAggregate (cost=4.32..18.46 rows=1 width=20) (actual time=0.015..0.015 rows=1.00 loops=1) + Buffers: shared hit=6 + -> Bitmap Heap Scan on enrolled_semesters es_1 (cost=4.32..18.43 rows=4 width=16) (actual time=0.012..0.013 rows=4.00 loops=1) + Recheck Cond: (user_id = 2500) + Heap Blocks: exact=4 + Buffers: shared hit=6 + -> Bitmap Index Scan on enrolled_semesters_user_id_semester_id_key (cost=0.00..4.32 rows=4 width=0) (actual time=0.005..0.005 rows=4.00 loops=1) + Index Cond: (user_id = 2500) + Index Searches: 1 + Buffers: shared hit=2 + -> GroupAggregate (cost=4.90..87.03 rows=1 width=12) (actual time=0.053..0.054 rows=1.00 loops=1) + Buffers: shared hit=66 + -> Nested Loop Left Join (cost=4.90..87.01 rows=1 width=8) (actual time=0.027..0.052 rows=12.00 loops=1) + Filter: (ps_1.id IS NULL) + Rows Removed by Filter: 8 + Buffers: shared hit=66 + -> Nested Loop (cost=4.61..80.15 rows=20 width=8) (actual time=0.014..0.023 rows=20.00 loops=1) + Buffers: shared hit=18 + -> Bitmap Heap Scan on enrolled_semesters es_2 (cost=4.32..18.43 rows=4 width=8) (actual time=0.010..0.012 rows=4.00 loops=1) + Recheck Cond: (user_id = 2500) + Heap Blocks: exact=4 + Buffers: shared hit=6 + -> Bitmap Index Scan on enrolled_semesters_user_id_semester_id_key (cost=0.00..4.32 rows=4 width=0) (actual time=0.006..0.006 rows=4.00 loops=1) + Index Cond: (user_id = 2500) + Index Searches: 1 + Buffers: shared hit=2 + -> Index Scan using semesters_subjects_enrolled_semesters_id_subjects_id_key on semesters_subjects ss_1 (cost=0.29..15.38 rows=5 width=8) (actual time=0.002..0.002 rows=5.00 loops=4) + Index Cond: (enrolled_semesters_id = es_2.id) + Index Searches: 4 + Buffers: shared hit=12 + -> Index Scan using passed_subjects_enrolled_id_key on passed_subjects ps_1 (cost=0.29..0.33 rows=1 width=8) (actual time=0.001..0.001 rows=0.40 loops=20) + Index Cond: (enrolled_id = ss_1.id) + Index Searches: 20 + Buffers: shared hit=48 + -> GroupAggregate (cost=4.60..51.70 rows=1 width=12) (actual time=0.428..0.428 rows=1.00 loops=1) + Buffers: shared hit=14 read=4 + -> Nested Loop (cost=4.60..51.68 rows=4 width=8) (actual time=0.299..0.426 rows=4.00 loops=1) + Buffers: shared hit=14 read=4 + -> Bitmap Heap Scan on enrolled_semesters es_3 (cost=4.32..18.43 rows=4 width=8) (actual time=0.058..0.061 rows=4.00 loops=1) + Recheck Cond: (user_id = 2500) + Heap Blocks: exact=4 + Buffers: shared hit=6 + -> Bitmap Index Scan on enrolled_semesters_user_id_semester_id_key (cost=0.00..4.32 rows=4 width=0) (actual time=0.047..0.047 rows=4.00 loops=1) + Index Cond: (user_id = 2500) + Index Searches: 1 + Buffers: shared hit=2 + -> Index Scan using ix_payment_enrollment on payment p (cost=0.29..8.30 rows=1 width=8) (actual time=0.090..0.090 rows=1.00 loops=4) + Index Cond: (enrollment_id = es_3.id) + Index Searches: 4 + Buffers: shared hit=8 read=4 + -> GroupAggregate (cost=4.31..5.44 rows=1 width=20) (actual time=0.105..0.106 rows=1.00 loops=1) + Buffers: shared hit=4 + -> Hash Join (cost=4.31..5.42 rows=1 width=12) (actual time=0.103..0.105 rows=1.00 loops=1) + Hash Cond: (d.id = ud.document_id) + Buffers: shared hit=4 + -> Seq Scan on documents d (cost=0.00..1.08 rows=8 width=8) (actual time=0.009..0.009 rows=8.00 loops=1) + Buffers: shared hit=1 + -> Hash (cost=4.30..4.30 rows=1 width=8) (actual time=0.088..0.088 rows=1.00 loops=1) + Buckets: 1024 Batches: 1 Memory Usage: 9kB + Buffers: shared hit=3 + -> Index Only Scan using user_documents_pkey on user_documents ud (cost=0.28..4.30 rows=1 width=8) (actual time=0.080..0.081 rows=1.00 loops=1) + Index Cond: (user_id = 2500) + Heap Fetches: 0 + Index Searches: 1 + Buffers: shared hit=3 +Planning: + Buffers: shared hit=563 +Planning Time: 17.012 ms +Execution Time: 1.067 ms +-- OK explain_dossier_one.sql