Uploaded image for project: 'Core Server'
  1. Core Server
  2. SERVER-22425

execStats in system.profile reports winning plan and rejected plans

    XMLWordPrintableJSON

Details

    • Fully Compatible
    • ALL
    • Hide 

      db.setProfilingLevel(0);
      		 
      db.system.profile.drop();
      		 
      db.c.drop();
      		 
      db.c.ensureIndex({a: 1});
      		 
      db.c.ensureIndex({b: 1});
      		 
      db.c.insert({a: 1, b: 1});
      		 
      db.setProfilingLevel(2);
      		 
      db.c.find({a: 1, b: 1}).itcount();
      		 
      db.setProfilingLevel(2);
      		 
      db.system.profile.find().pretty();

      Show
      db.setProfilingLevel(0); db.system.profile.drop(); db.c.drop(); db.c.ensureIndex({a: 1}); db.c.ensureIndex({b: 1}); db.c.insert({a: 1, b: 1}); db.setProfilingLevel(2); db.c.find({a: 1, b: 1}).itcount(); db.setProfilingLevel(2); db.system.profile.find().pretty();
    • Query 10 (02/22/16), Query 11 (03/14/16)

    Description

      When profiling is enabled, find operations will add a field called execStats containing some information about the execution of the query plan. In 2.6.x and 3.0.x versions, this contained information about the winning plan only. If the query used the multiplan path, information about the rejected plans was rejected.

      This behavior changed in 3.2.0 as a result of 5aefcdd under SERVER-20111. The profile entries now can contain execStats with a MULTI_PLAN stage. All children of the MULTI_PLAN stage are reported, regardless of which child represents the winning plan.

      Attachments

        Issue Links

          is related to

          Bug - A problem which impairs or prevents the functions of the product. SERVER-20111 Explain helpers report incorrect plan summary and summary statistics when multiple candidate plans generated

          • Major - P3 - Major loss of function.
          • Closed

          Activity

            People

              james.wahlin@mongodb.com James Wahlin
              david.storch@mongodb.com David Storch
              Votes:
              0 Vote for this issue
              Watchers:
              4 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved: