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Деев Егор Викторович 2026-10-05 17:19:44 +00:00
parent fe5e71a248
commit 227b491d96
7 changed files with 6639 additions and 6634 deletions
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5
.gitattributes vendored Normal file
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* text=auto eol=lf
*.png binary
*.pdf binary
*.docx binary
*.pgerd text

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Mobiles Dataset 2025.csv
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docs/README.md
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docs/report.md
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scripts/exe/mobile_devices.py
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28
sql/explain_results/без_индексов.csv
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"QUERY PLAN"
"Sort (cost=44.76..44.84 rows=31 width=245) (actual time=0.216..0.217 rows=18 loops=1)"
" Sort Key: c.company_name, m.model_name"
" Sort Method: quicksort Memory: 25kB"
" -> Hash Join (cost=17.20..43.99 rows=31 width=245) (actual time=0.055..0.180 rows=18 loops=1)"
" Hash Cond: (m.company_id = c.company_id)"
" -> Seq Scan on models m (cost=0.00..26.71 rows=31 width=31) (actual time=0.038..0.159 rows=18 loops=1)"
" Filter: (((ram)::text ~~ '%8GB%'::text) AND ((battery_capacity)::text ~~ '%5000%'::text))"
" Rows Removed by Filter: 896"
" -> Hash (cost=13.20..13.20 rows=320 width=222) (actual time=0.010..0.010 rows=19 loops=1)"
" Buckets: 1024 Batches: 1 Memory Usage: 9kB"
" -> Seq Scan on companies c (cost=0.00..13.20 rows=320 width=222) (actual time=0.004..0.005 rows=19 loops=1)"
"Planning Time: 0.155 ms"
"Execution Time: 0.234 ms"
"QUERY PLAN"
"Sort (cost=44.76..44.84 rows=31 width=245) (actual time=0.216..0.217 rows=18 loops=1)"
" Sort Key: c.company_name, m.model_name"
" Sort Method: quicksort Memory: 25kB"
" -> Hash Join (cost=17.20..43.99 rows=31 width=245) (actual time=0.055..0.180 rows=18 loops=1)"
" Hash Cond: (m.company_id = c.company_id)"
" -> Seq Scan on models m (cost=0.00..26.71 rows=31 width=31) (actual time=0.038..0.159 rows=18 loops=1)"
" Filter: (((ram)::text ~~ '%8GB%'::text) AND ((battery_capacity)::text ~~ '%5000%'::text))"
" Rows Removed by Filter: 896"
" -> Hash (cost=13.20..13.20 rows=320 width=222) (actual time=0.010..0.010 rows=19 loops=1)"
" Buckets: 1024 Batches: 1 Memory Usage: 9kB"
" -> Seq Scan on companies c (cost=0.00..13.20 rows=320 width=222) (actual time=0.004..0.005 rows=19 loops=1)"
"Planning Time: 0.155 ms"
"Execution Time: 0.234 ms"

1 QUERY PLAN
2 Sort (cost=44.76..44.84 rows=31 width=245) (actual time=0.216..0.217 rows=18 loops=1)
3 Sort Key: c.company_name, m.model_name
4 Sort Method: quicksort Memory: 25kB
5 -> Hash Join (cost=17.20..43.99 rows=31 width=245) (actual time=0.055..0.180 rows=18 loops=1)
6 Hash Cond: (m.company_id = c.company_id)
7 -> Seq Scan on models m (cost=0.00..26.71 rows=31 width=31) (actual time=0.038..0.159 rows=18 loops=1)
8 Filter: (((ram)::text ~~ '%8GB%'::text) AND ((battery_capacity)::text ~~ '%5000%'::text))
9 Rows Removed by Filter: 896
10 -> Hash (cost=13.20..13.20 rows=320 width=222) (actual time=0.010..0.010 rows=19 loops=1)
11 Buckets: 1024 Batches: 1 Memory Usage: 9kB
12 -> Seq Scan on companies c (cost=0.00..13.20 rows=320 width=222) (actual time=0.004..0.005 rows=19 loops=1)
13 Planning Time: 0.155 ms
14 Execution Time: 0.234 ms

12
sql/explain_results/с_индексами.csv
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"schemaname","n_tup_ins","n_tup_upd","n_tup_del","seq_scan","seq_tup_read","idx_scan","idx_tup_fetch"
"public","19","0","0","33","589","934","915"
"public","914","0","0","32","27420","5520","4702"
"public","4569","0","0","26","109656","4750","565"
"public","5","0","0","9","30","4594","4594"
"public","217","0","0","8","1302","1141","924"
"schemaname","n_tup_ins","n_tup_upd","n_tup_del","seq_scan","seq_tup_read","idx_scan","idx_tup_fetch"
"public","19","0","0","33","589","934","915"
"public","914","0","0","32","27420","5520","4702"
"public","4569","0","0","26","109656","4750","565"
"public","5","0","0","9","30","4594","4594"
"public","217","0","0","8","1302","1141","924"

1 schemaname n_tup_ins n_tup_upd n_tup_del seq_scan seq_tup_read idx_scan idx_tup_fetch
2 public 19 0 0 33 589 934 915
3 public 914 0 0 32 27420 5520 4702
4 public 4569 0 0 26 109656 4750 565
5 public 5 0 0 9 30 4594 4594
6 public 217 0 0 8 1302 1141 924