Analyze Your Data Schema分析数据架构

Field with a Single Data Type具有单一数据类型的字段

Below is an example of the data type summary for a field called last_login which contains data of type date.下面是一个名为last_login的字段的date类型摘要示例，该字段包含日期类型的数据。

Field with Multiple Data Types具有多种数据类型的字段

For fields that contain multiple data types, Compass displays a percentage breakdown of the various data types across documents. 对于包含多种数据类型的字段，Compass会显示文档中各种数据类型的百分比细分。In the example below, the chart shows the contents of a field called phone_no in which 81% of documents are of type string, and the remaining 19% are of type number.在下面的示例中，图表显示了一个名为phone_no的字段的内容，其中81%的文档是string类型，其余19%是number类型。

Missing Field缺少字段

If a collection contains documents in which not all fields contain a value, the missing values display as undefined. 如果集合包含的文档中并非所有字段都包含值，则缺少的值将显示为undefined。In the example below, the field age has no recorded value in 40% of the sampled documents.在下面的示例中，字段age在40%的采样文档中没有记录值。

Strings字符串

Strings can appear in three different ways. 字符串可以以三种不同的方式出现。If there are entirely unique strings in a field, Compass shows a random selection of string values from the specified field. 如果字段中有完全唯一的字符串，Compass会显示从指定字段中随机选择的字符串值。Click the circular refresh icon to see a new set of randomly selected values from the field.单击循环刷新图标以查看字段中随机选择的一组新值。

If there are only a few different string values, Compass shows the strings in a single graded bar which shows the percentage of the population of the string values.如果只有几个不同的字符串值，Compass会在单个分级条中显示字符串，该分级条显示字符串值的总体百分比。

If there are multiple string values with some duplicates, Compass shows a histogram indicating the frequency of each string found within the field.如果存在多个重复的字符串值，Compass会显示一个直方图，指示字段中每个字符串的频率。

Numbers数字

Numbers are similar to strings in their representation. Unique numbers are shown in the following manner:数字在表示形式上与字符串相似。唯一数字以以下方式显示：

Duplicate numbers are shown in a histogram that indicates their frequency:重复的数字显示在直方图中，表示其频率：

Dates and ObjectIDs日期和对象ID

Fields that represent dates (and fields that contain the ObjectID data type, which includes a timestamp) are shown across multiple bar charts. 表示日期的字段（以及包含ObjectID数据类型（包括时间戳）的字段）显示在多个条形图中。The two charts on the top row represent the day of the week and time of day of the timestamp value.顶行的两个图表表示时间戳值的星期几和时间。

The single chart on the bottom shows the first and last timestamp value, and the vertical lines represent the distribution of the timestamp across the range of first to last.底部的单个图表显示了第一个和最后一个时间戳值，竖线表示时间戳在从第一个到最后一个的范围内的分布。

Embedded Documents and Arrays嵌入式文档和数组

Fields that contain a sub-document or an array are displayed with a small triangle next to them and a visual representation of the data contained within the sub-document or array.包含子文档或数组的字段旁边会显示一个小三角形，以及子文档或数组中包含的数据的可视化表示。

Click on the triangle to expand the field and view the embedded documents:单击三角形展开字段并查看嵌入的文档：

GeoJSON and [longitude,latitude] Arrays

Fields that contain GeoJSON data or [longitude,latitude] arrays are displayed with interactive maps. 包含GeoJSON数据或[longitude,latitude]数组的字段与交互式地图一起显示。For more information on interacting with location data in Compass, see Analyze Location Data.有关在Compass中与位置数据交互的详细信息，请参阅分析位置数据。

View Charts of Mixed Types查看混合类型的图表

If a field has mixed types, you can view different charts of each type by clicking on the type field. 如果字段具有混合类型，则可以通过单击type字段来查看每种类型的不同图表。In the example below, the age field shows the values that are strings:在下面的示例中，age字段显示字符串形式的值：

Clicking on the number type causes the chart to show its numeric data:单击number类型会使图表显示其数字数据：

Apply a Location Filter应用位置筛选器

You can apply a filter to the map to only analyze a specific range of points. 您可以对地图应用筛选器，以仅分析特定范围的点。To define a location filter:要定义位置筛选器，请执行以下操作：

1. Click the Circle button at the top-right of the map.单击地图右上角的“圆形”按钮。
2. Click and drag on the map to draw a circle containing the area of the map you want to analyze.单击并拖动地图以绘制一个包含要分析的地图区域的圆。
3. Repeat this process as desired to include additional areas of the map in the schema analysis.根据需要重复此过程，以便在模式分析中包括地图的其他区域。

The query bar updates as you draw location filters to show the exact coordinates used in the $geoWithin query applied to the schema analysis.在绘制位置筛选器时，查询栏会更新，以显示应用于架构分析的$geoWithin查询中使用的确切坐标。

If you specify multiple location filters, the query becomes an $or query with multiple $geoWithin operators.如果指定多个位置筛选器，则查询将变为具有多个$geoWithin运算符的$or查询。

Edit a Location Filter编辑位置筛选器

To move or resize a location filter, click on the right side of the map. 要移动位置筛选器或调整其大小，请单击地图右侧的。You will enter the filter editing mode, which looks like this:您将进入筛选器编辑模式，如下所示：

To move a filter移动筛选器

Click and drag the square in the center of the circle.单击并拖动圆中心的正方形。

To resize a filter调整筛选器的大小

Click and drag the square at the edge of the circle.单击并拖动圆边缘的正方形。

After modifying your filters, click Save.修改筛选器后，单击“保存”。

Delete a Location Filter删除位置筛选器

To delete a location filter from the map:要从地图中删除位置筛选器，请执行以下操作：

1. Click on the right side of the map.单击地图右侧的。
2. Either click:单击以下两者之一：
   • A location filter to delete that filter.用于删除该筛选器的位置筛选器。
   • Clear All to delete all location filters.“清除全部”以删除所有位置筛选器。
3. Click Save.单击“保存”。