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  1. WiredTiger
  2. WT-2445

Collect statistics about data size in WiredTiger cache per namespace

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    • Icon: New Feature New Feature
    • Resolution: Duplicate
    • Icon: Major - P3 Major - P3
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    Description

      In order to assist our users with WT cache sizing, we need a way to gather information about memory pages currently in the cache, specifically which namespaces/indexes they belong to and their size, so that a working set estimation can be performed, e.g.:

      "test.test" : {
      		 
      cached_pages: 54
      		 
      cached_size: 23456
      		 
      },
      		 
      "test.test._id_" : {
      		 
       cached_pages: 5
      		 
       cached_size: 1234
      		 
      }

      This statistic can be approximate and I think it only needs to be executed ad-hoc, but it must not noticeably disrupt ongoing database operations.

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            backlog-server-execution Backlog - Storage Execution Team
            alex.komyagin@mongodb.com Alexander Komyagin
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