mongodb common ops

mongodb.js

// drop all non-system colls
db.getCollectionNames().forEach(function(c) { if (c.indexOf("system.") == -1) db[c].drop(); })

// clear old profiles
db.setProfilingLevel(0); db.system.profile.drop(); db.setProfilingLevel(1, 100)

// view top profile queries
db.getCollection('system.profile').find({}, {ns: 1, query:1, millis:1, command: 1}).sort({millis:-1})

//slow queries starting from a given date
db.getCollection('system.profile').find({ts: { $gte : new ISODate("2016-07-15T13:00:00.000Z") }})

// index stats
db.collection.stats().indexSizes