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POCan the field names in a MongoDB document be queried, perhaps using aggregation?
 

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  1. POCan the field names in a MongoDB document be queried, perhaps using aggregation?
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    <p>In this article from the MongoDB blog, "<a href="http://blog.mongodb.org/post/65517193370/schema-design-for-time-series-data-in-mongodb" rel="nofollow">Schema Design for Time Series Data in MongoDB</a>" the author proposed storing multiple time series values in a single document as numbered children of a base timestamp (i.e. document per minute, seconds as array of values).</p> <pre><code>{ timestamp_minute: ISODate("2013-10-10T23:06:00.000Z"), type: “memory_used”, values: { 0: 999999, … 37: 1000000, 38: 1500000, … 59: 2000000 } } </code></pre> <p>The proposed schema sounds like a good one but they fail to mention how to query the "values" field names which would be required if you wanted to know when the last sample occurred. </p> <p>How would you go about constructing a query to find something like the time of the most recent metric (combining timestamp_minute and highest field name in the values)?</p> <p>Thanks so much!</p>
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    1. USJames White
    1. USJames White
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    1. COI'd probably suggest you always double store the value if it's a common query you'd like to do: `"most_recent_value"`
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      1. POCan the field names in a MongoDB document be queried, perhaps using aggregation?
      1. USWiredPrairie
 

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