Details
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Improvement
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Status: Closed
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Major - P3
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Resolution: Works as Designed
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2.6.3
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None
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None
Description
db.foo.drop();
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var filler = '';
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for(c=0;c < 100; c++) {
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filler += 'a';
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}
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for( i =0; i < 100000; i++) {
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db.foo.insert({ "n" : Math.floor(100 * Math.random()), "fill" : filler} );
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}
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> db.foo.find().explain()
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{
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"cursor" : "BasicCursor",
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"isMultiKey" : false,
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"n" : 100000,
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"nscannedObjects" : 100000,
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"nscanned" : 100000,
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"nscannedObjectsAllPlans" : 100000,
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"nscannedAllPlans" : 100000,
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"scanAndOrder" : false,
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"indexOnly" : false,
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"nYields" : 781,
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"nChunkSkips" : 0,
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"millis" : 15,
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"server" : "skye.local:27017",
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"filterSet" : false
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}
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> db.foo.find({n:{$gte:0}}).explain()
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{
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"cursor" : "BasicCursor",
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"isMultiKey" : false,
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"n" : 100000,
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"nscannedObjects" : 100000,
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"nscanned" : 100000,
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"nscannedObjectsAllPlans" : 100000,
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"nscannedAllPlans" : 100000,
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"scanAndOrder" : false,
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"indexOnly" : false,
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"nYields" : 781,
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"nChunkSkips" : 0,
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"millis" : 39,
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"server" : "skye.local:27017",
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"filterSet" : false
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}
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In the test above, both queries return the same amount of documents, but looks like the overheard of the range comparison is unexpectedly high. Opening a ticket to see if there's some optimization we can do here.
Attachments
Issue Links
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- Closed
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