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MongoDB: why $natural query in non-capped collection does not represent the order of insertion, especially for WT ?

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MongoDB: why $natural query in non-capped collection does not represent the order of insertion, especially for WT ?
posted Mar 8, 2017 by Naveena Garg

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How to get all query which related 1 collection in mongodb? for oracle,we can get all query from system view like v$sql, but I am not sure if mongodb have this system view to see all query related 1 special collection?

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We have mongodb cluster with 3 instances. After increase of amount of writes there, WiredTigerLAS.wt become 20Gbs size on all nodes in just few mins. It leaded to out space issue and of course downtime. This is strange, because usually this file have size less then 1,5 GB.
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