mongoose-profiler

This is a mongoose plugin for tuning performance.
It will show the explain results on the console when the query is slow. Such as mongodb scans all documents in the collection without index.

Don't use it on production!!

Installation

$ npm install mongoose-profiler --save-dev

Quick start

const mongooseProfiler = require('mongoose-profiler');
schema.plugin(mongooseProfiler());

When you execute this query without the index then you will get some messages on the console.

ProductModel
  .where({state: 'active'})
  .where({owner: {$in: ['5c9d9428e7462d3d989cb69b', '5c9d95acea5c9b4036d97c88']}})
  .limit(100);

Mongoose:      64ms Products.find({ state: 'active', owner: { '$in': [ ObjectId("5c9d9428e7462d3d989cb69b"), ObjectId("5c9d95acea5c9b4036d97c88") ] } }, { skip: 0, limit: 100 })
[ { queryPlanner:
     { plannerVersion: 1,
       namespace: 'database.Products',
       indexFilterSet: false,
       parsedQuery:
        { '$and':
           [ { state: { '$eq': 'active' } },
             { owne:
                { '$in':
                   [ ObjectID {
                       _bsontype: 'ObjectID',
                       id: Buffer [Uint8Array] [ ... ] },
                     ObjectID {
                       _bsontype: 'ObjectID',
                       id: Buffer [Uint8Array] [ ... ] } ] } } ] },
       winningPlan:
        { stage: 'LIMIT',
          limitAmount: 100,
          inputStage:
           { stage: 'COLLSCAN',
             filter:
              { '$and':
                 [ { state: { '$eq': 'active' } },
                   { owne:
                      { '$in':
                         [ ObjectID {
                             _bsontype: 'ObjectID',
                             id: Buffer [Uint8Array] [ ... ] },
                           ObjectID {
                             _bsontype: 'ObjectID',
                             id: Buffer [Uint8Array] [ ... ] } ] } } ] },
             direction: 'forward' } },
       rejectedPlans: [] },
    executionStats:
     { executionSuccess: true,
       nReturned: 1,
       executionTimeMillis: 0,
       totalKeysExamined: 0,
       totalDocsExamined: 9,
       executionStages:
        { stage: 'LIMIT',
          nReturned: 1,
          ...
          inputStage:
           { stage: 'COLLSCAN',
             filter:
              { '$and':
                 [ { state: { '$eq': 'active' } },
                   { owne:
                      { '$in':
                         [ ObjectID {
                             _bsontype: 'ObjectID',
                             id: Buffer [Uint8Array] [ ... ] },
                           ObjectID {
                             _bsontype: 'ObjectID',
                             id: Buffer [Uint8Array] [ ... ] } ] } } ] },
             nReturned: 1,
             ...
             docsExamined: 9 } },
       allPlansExecution: [] },
    serverInfo:
     { ... },
    ok: 1 } ]

mongooseProfiler()

const mongooseProfiler = require('mongoose-profiler');
schema.plugin(mongooseProfiler({
  isAlwaysShowQuery: true,
  duration: 1000,
  totalDocsExamined: 1000,
  level: 'COLLSCAN',
  logger: {
    info: console.info,
    error: console.error
  }
}));

Options

Name	Type	Default	Description
isAlwaysShowQuery	Boolean	true
duration	Number	1000ms	Show the explain result when the query took more than this time. (The time from pre() to post().)
totalDocsExamined	Number		Show the explain result when the query examined documents more than this number.
level	String	COLLSCAN	ALL: Show the explain result of all queries. COLLSCAN: Show the explain result when the mongodb scan collections.
logger	{info: function, error: function}		Custom console log.