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POmongodb stores large size documents and query is very slow
 

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  1. POmongodb stores large size documents and query is very slow
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    <p>I store a very long string to my document in mongodb server, my document looks like </p> <pre><code>{ "_id": ObjectId("5280efdbe4b062c93b582118"), "viewID": 1, "content": "a very long string" } </code></pre> <p>and there are about hundreds of such documents in the same collection. I have indexed the collection. </p> <p>The problem is that I just execute a very simple query </p> <pre><code>db.blog.find({viewID:1}); </code></pre> <p>and then get a very long time (over several hours) to wait for the response, and no any error message displayed, server status is OK. But I just add <code>db.blog.find({viewID:1}).limit(1);</code> mongodb returns the result at once. </p> <p>How can I do to solve the problem or improve the performance??</p> <p>Here is my explain:</p> <pre><code>db.blog.find({viewID:1}).explain(); { "cursor" : "BtreeCursor viewID_1", "isMultiKey" : false, "n" : 377, "nscannedObjects" : 377, "nscanned" : 377, "nscannedObjectsAllPlans" : 377, "nscannedAllPlans" : 377, "scanAndOrder" : false, "indexOnly" : false, "nYields" : 0, "nChunkSkips" : 0, "millis" : 45, "indexBounds" : { "viewID" : [ [ 1, 1 ] ] }, "server" : "Server:27017" } </code></pre> <p>Here is colStat:</p> <pre><code>db.blog.stats(); { "ns" : "***.blog", "count" : 98582, "size" : 2330759632, "avgObjSize" : 23642.851960804204, "storageSize" : 2958364672, "numExtents" : 18, "nindexes" : 2, "lastExtentSize" : 778276864, "paddingFactor" : 1, "systemFlags" : 1, "userFlags" : 0, "totalIndexSize" : 6540800, "indexSizes" : { "_id_" : 4055296, "viewID_1" : 2485504 }, "ok" : 1 } </code></pre>
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    1. USEngine Bai
    1. USEngine Bai
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      1. POmongodb stores large size documents and query is very slow
      1. USChia-Yu Pai
      1. VTFavorite
    1. COhow many documents do you have and how big is the document?
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      1. POmongodb stores large size documents and query is very slow
      1. USSalvador Dali
    2. COPlease tell us **how** you indexed the collection. Also, please run your query with `.explain()` added to the end of your command and post the output. It tells us if and how your index is used.
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      1. POmongodb stores large size documents and query is very slow
      1. USPhilipp
    3. COI'm going to guess that viewID is not indexed?
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      1. POmongodb stores large size documents and query is very slow
      1. USAsya Kamsky
 

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