Question

我在rethinkdb的数据库中有一个包含580万条记录的表，其中的一个示例如下：

{
"release": {
    "genres": {
        "genre": "Electronic"
    },
    "identifiers": {
        "identifier": [
            {
                "description": "A-Side",
                "value": "MPO SK 032 A1 G PHRUPMASTERGENERAL T27 LONDON",
                "type": "Matrix / Runout"
            },
            {
                "description": "B-Side",
                "value": "MPO SK 032 B1",
                "type": "Matrix / Runout"
            },
            {
                "description": "C-Side",
                "value": "MPO SK 032 C1",
                "type": "Matrix / Runout"
            },
            {
                "description": "D-Side",
                "value": "MPO SK 032 D1",
                "type": "Matrix / Runout"
            }
        ]
    },
    "status": "Accepted",
    "videos": {
        "video": [
            {
                "title": "The Persuader (Jesper Dahlbäck) - Östermalm",
                "duration": 290,
                "description": "The Persuader (Jesper Dahlbäck) - Östermalm",
                "src": "http://www.youtube.com/watch?v=AHuQWcylaU4",
                "embed": true
            },
            {
                "title": "The Persuader - Vasastaden",
                "duration": 380,
                "description": "The Persuader - Vasastaden",
                "src": "http://www.youtube.com/watch?v=5rA8CTKKEP4",
                "embed": true
            },
            {
                "title": "The Persuader-Stockholm-Sodermalm",
                "duration": 335,
                "description": "The Persuader-Stockholm-Sodermalm",
                "src": "http://www.youtube.com/watch?v=QVdDhOnoR8k",
                "embed": true
            },
            {
                "title": "The Persuader - Norrmalm",
                "duration": 289,
                "description": "The Persuader - Norrmalm",
                "src": "http://www.youtube.com/watch?v=hy47qgyJeG0",
                "embed": true
            }
        ]
    },
    "labels": {
        "label": {
            "catno": "SK032",
            "name": "Svek"
        }
    },
    "companies": {
        "company": [
            {
                "id": 271046,
                "catno": "",
                "name": "The Globe Studios",
                "entity_type_name": "Recorded At",
                "resource_url": "http://api.discogs.com/labels/271046",
                "entity_type": 23
            },
            {
                "id": 56025,
                "catno": "",
                "name": "MPO",
                "entity_type_name": "Pressed By",
                "resource_url": "http://api.discogs.com/labels/56025",
                "entity_type": 17
            }
        ]
    },
    "styles": {
        "style": "Deep House"
    },
    "formats": {
        "format": {
            "text": "",
            "name": "Vinyl",
            "qty": 2,
            "descriptions": {
                "description": [
                    "12\"",
                    "33 ⅓ RPM"
                ]
            }
        }
    },
    "country": "Sweden",
    "id": 1,
    "released": "1999-03-00",
    "artists": {
        "artist": {
            "id": 1,
            "anv": "",
            "name": "Persuader, The",
            "role": "",
            "tracks": "",
            "join": ""
        }
    },
    "title": "Stockholm",
    "master_id": 5427,
    "tracklist": {
        "track": [
            {
                "position": "A",
                "duration": "4:45",
                "title": "Östermalm"
            },
            {
                "position": "B1",
                "duration": "6:11",
                "title": "Vasastaden"
            },
            {
                "position": "B2",
                "duration": "2:49",
                "title": "Kungsholmen"
            },
            {
                "position": "C1",
                "duration": "5:38",
                "title": "Södermalm"
            },
            {
                "position": "C2",
                "duration": "4:52",
                "title": "Norrmalm"
            },
            {
                "position": "D",
                "duration": "5:16",
                "title": "Gamla Stan"
            }
        ]
    },
    "data_quality": "Complete and Correct",
    "extraartists": {
        "artist": {
            "id": 239,
            "anv": "",
            "name": "Jesper Dahlbäck",
            "role": "Music By [All Tracks By]",
            "tracks": "",
            "join": ""
        }
    },
    "notes": "The song titles are the names of Stockholm's districts."
}}

我正在尝试检索艺术家名称为“Persuader，The”的发布标题

我使用了以下命令：

r.db("discogs").table("releases").getField("release").filter(r.row("artists").getField("artist").getField("name").eq("Persuader, The")).getField("title")

这需要太长时间。但是，它可以在较小的数据库上快速运行我如何加快速度？

Answer 1

目前，您的查询中没有索引，这意味着数据库必须遍历艺术家过滤掉的每个文档。

您可以使用indexCreate命令为嵌套的艺术家名称属性创建索引：

r
  .db("discogs")
  .table("releases")
  .indexCreate('artistName', r.row('release')('artists')('artist')('name'));

之后，您可以使用getAll命令获取具有特定艺术家姓名的所有行。

r
  .db("discogs")
  .table("releases")
  .getAll("Persuader, The", { index: 'artistName' });

这不仅更清洁，而且更快。

REQL命令耗时太长

1 个答案: