{ "started_at": "2026-10-02T12:09:46.446459+00:00", "dataset": "280000 synthetic order rows", "query": "SELECT id_order, reference, total_paid\nFROM demo_orders\nWHERE id_shop=3 AND current_state=2 AND date_add>='2026-09-01'\nORDER BY date_add DESC, id_order DESC LIMIT 50", "server_listens_on_tcp": false, "limit": "Personal example, not a PrestaShop installation or customer performance guarantee", "version": "11.8.6-MariaDB-5ubuntu0.1 from Ubuntu", "rows": 280000, "before": { "when": "2026-10-02T12:09:52.670148+00:00", "wall_ms": [ 144.62507696589455, 115.70991901680827, 135.09461301146075, 111.39938898850232, 152.05060999142006, 146.09527302673087, 172.56859398912638 ], "median_wall_ms": 144.62507696589455, "output_sha256": "161536d00a972e11ee70da4a6f23fde7085d1f19ba1461c0764cc2c6bebd9701", "output_lines": 50, "explain": { "query_block": { "select_id": 1, "cost": 46.7785244, "nested_loop": [ { "read_sorted_file": { "filesort": { "sort_key": "demo_orders.date_add desc, demo_orders.id_order desc", "table": { "table_name": "demo_orders", "access_type": "ALL", "loops": 1, "rows": 281716, "cost": 46.7785244, "filtered": 100, "attached_condition": "demo_orders.id_shop = 3 and demo_orders.current_state = 2 and demo_orders.date_add >= '2026-09-01'" } } } } ] } }, "analyze": { "query_optimization": { "r_total_time_ms": 0.163535394 }, "query_block": { "select_id": 1, "cost": 46.7785244, "r_loops": 1, "r_total_time_ms": 99.3773846, "nested_loop": [ { "read_sorted_file": { "r_rows": 50, "filesort": { "sort_key": "demo_orders.date_add desc, demo_orders.id_order desc", "r_loops": 1, "r_total_time_ms": 99.25349847, "r_limit": 50, "r_used_priority_queue": true, "r_output_rows": 51, "r_sort_mode": "sort_key,rowid", "table": { "table_name": "demo_orders", "access_type": "ALL", "loops": 1, "r_loops": 1, "rows": 281716, "r_rows": 280000, "cost": 46.7785244, "r_table_time_ms": 71.31856111, "r_other_time_ms": 27.96206151, "r_engine_stats": { "pages_accessed": 1080 }, "filtered": 100, "r_total_filtered": 0.216071429, "attached_condition": "demo_orders.id_shop = 3 and demo_orders.current_state = 2 and demo_orders.date_add >= '2026-09-01'", "r_filtered": 0.216071429 } } } } ] } } }, "after": { "when": "2026-10-02T12:09:54.063065+00:00", "wall_ms": [ 55.44817599002272, 56.58715800382197, 37.36364503856748, 73.54871102143079, 44.4394419901073, 54.189533984754235, 59.794309025164694 ], "median_wall_ms": 55.44817599002272, "output_sha256": "161536d00a972e11ee70da4a6f23fde7085d1f19ba1461c0764cc2c6bebd9701", "output_lines": 50, "explain": { "query_block": { "select_id": 1, "cost": 1.09993904, "nested_loop": [ { "table": { "table_name": "demo_orders", "access_type": "range", "possible_keys": [ "demo_filter" ], "key": "demo_filter", "key_length": "13", "used_key_parts": [ "id_shop", "current_state", "date_add" ], "loops": 1, "rows": 605, "cost": 1.09993904, "filtered": 100, "attached_condition": "demo_orders.id_shop = 3 and demo_orders.current_state = 2 and demo_orders.date_add >= '2026-09-01'" } } ] } }, "analyze": { "query_optimization": { "r_total_time_ms": 0.195831863 }, "query_block": { "select_id": 1, "cost": 1.09993904, "r_loops": 1, "r_total_time_ms": 0.178467424, "nested_loop": [ { "table": { "table_name": "demo_orders", "access_type": "range", "possible_keys": [ "demo_filter" ], "key": "demo_filter", "key_length": "13", "used_key_parts": [ "id_shop", "current_state", "date_add" ], "loops": 1, "r_loops": 1, "rows": 605, "r_rows": 50, "cost": 1.09993904, "r_table_time_ms": 0.14930735, "r_other_time_ms": 0.020252245, "r_engine_stats": { "pages_accessed": 125 }, "filtered": 100, "r_total_filtered": 100, "attached_condition": "demo_orders.id_shop = 3 and demo_orders.current_state = 2 and demo_orders.date_add >= '2026-09-01'", "r_filtered": 100 } } ] } } }, "rollback": { "when": "2026-10-02T12:09:55.475115+00:00", "wall_ms": [ 165.37074302323163, 146.6291170218028, 123.60237695975229, 126.0548559948802, 148.41011801036075, 133.7897449848242, 144.26573103992268 ], "median_wall_ms": 144.26573103992268, "output_sha256": "161536d00a972e11ee70da4a6f23fde7085d1f19ba1461c0764cc2c6bebd9701", "output_lines": 50, "explain": { "query_block": { "select_id": 1, "cost": 46.7785244, "nested_loop": [ { "read_sorted_file": { "filesort": { "sort_key": "demo_orders.date_add desc, demo_orders.id_order desc", "table": { "table_name": "demo_orders", "access_type": "ALL", "loops": 1, "rows": 281716, "cost": 46.7785244, "filtered": 100, "attached_condition": "demo_orders.id_shop = 3 and demo_orders.current_state = 2 and demo_orders.date_add >= '2026-09-01'" } } } } ] } }, "analyze": { "query_optimization": { "r_total_time_ms": 0.132041929 }, "query_block": { "select_id": 1, "cost": 46.7785244, "r_loops": 1, "r_total_time_ms": 87.55485401, "nested_loop": [ { "read_sorted_file": { "r_rows": 50, "filesort": { "sort_key": "demo_orders.date_add desc, demo_orders.id_order desc", "r_loops": 1, "r_total_time_ms": 87.43308485, "r_limit": 50, "r_used_priority_queue": true, "r_output_rows": 51, "r_sort_mode": "sort_key,rowid", "table": { "table_name": "demo_orders", "access_type": "ALL", "loops": 1, "r_loops": 1, "rows": 281716, "r_rows": 280000, "cost": 46.7785244, "r_table_time_ms": 63.52561936, "r_other_time_ms": 23.97705862, "r_engine_stats": { "pages_accessed": 1080 }, "filtered": 100, "r_total_filtered": 0.216071429, "attached_condition": "demo_orders.id_shop = 3 and demo_orders.current_state = 2 and demo_orders.date_add >= '2026-09-01'", "r_filtered": 0.216071429 } } } } ] } } }, "checks": [ "280000 rows counted", "seven stable repetitions per phase", "50 identical rows before/after", "index selected by optimizer", "index removed on rollback", "same result after rollback" ], "ok": true, "server_stopped": true, "finished_at": "2026-10-02T12:09:55.740795+00:00" }