提高SQL查询速度

我使用MySQL和我有一样的模式：提高SQL查询速度

|------------|-------------|------------|--------------| 
| cities |category_city| categories| companies | 
|------------|-------------|------------|--------------| 
|  id  | city_id |  id  |  id  | 
| name | category_id | name |subcategory_id| 
|   |    | parent_id | city_id | 
|   |    |   |...other cols | 
|____________|_____________|____________|______________|

关系：市同类别有->belongsToMany()

public function categories() 
{ 
    return $this->belongsToMany(Category::class); 
}

类别有子类别：

public function subcategories() 
{ 
    return $this->hasMany(Category::class, 'parent_id', 'id'); 
}

我从类别和城市筛选公司，因为我需要当前的城市公司和我有一个全局范围：

public function getCompanies($city_id) 
    { 
     return $this->companies()->whereHas('mainCity', function ($q) use ($city_id) { 
      $q->where('city_id', $city_id); 
     }); 
    }

mainCity方法：

public function mainCity() 
{ 
    return $this->belongsTo(City::class, 'city_id'); 
}

这里是我的方法执行与AJAX请求查询：

public function getPlaces(City $city, Category $subcategory, $north, $south, $east, $west) 
{ 
    $companies = $subcategory->companies() 
     ->withCount('comments') 
     ->companiesByBounds($north, $south, $east, $west) 
     ->paginate(8); 

    $markers = $subcategory->companies() 
     ->companiesByBounds($north, $south, $east, $west) 
     ->get(['lat', 'lng', 'slug', 'title']); 

    return response()->json(['companies' => $companies, 'markers' => $markers], 200, [], JSON_NUMERIC_CHECK); 
}

和byByBounds示波器方法：

public function scopeCompaniesByBounds($query, $north, $south, $east, $west) 
{ 
    return $query->whereBetween('lat', [$south, $north]) 
     ->whereBetween('lng', [$west, $east]); 
}

在公司我有~2m记录。主要问题是查询花费3.5秒。请帮助改善我的疑问。

下面是该查询：

select count(*) as aggregate from `companies` where `companies`.`category_id` = '40' and `companies`.`category_id` is not null and `lat` between '53.68540097020851' and '53.749703253622705' and `lng` between '91.34262820463869' and '91.51600619536134'

来源

2017-05-04 pwnz22

您是否尝试过使用EXPLAIN/Visual Explain运行结果SQL来查看执行计划？ –

不，我没有。我怎样才能做到这一点？ – pwnz22

我并不熟悉laravel，所以不知道如果http://stackoverflow.com/questions/18236294/how-do-i-get-the-query-builder-to-output-its-raw-sql- query-as-a-string将会为你提供实际的SQL查询。如果是这样，那么https://dev.mysql.com/doc/refman/5.7/en/explain.html展示了如何使用EXPLAIN，并且MySQL Workbench中的某处是Visual Explain。 –

要提高，你需要在列lat和lng添加索引的速度。

CREATE INDEX idx_lat ON companies (lat);

当列添加到条件时，索引用于查询中。

来源

2017-05-04 07:18:06 StanislavL

提高SQL查询速度

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