Remove old records in mongodb based on Month

Question

I am trying to delete Older records present in my collection .

I have a collection named \"user_track\" , which consists of data in this format shown below

Answer 1

You can give any Date with Javascript date

db.user_track.remove( { access_time : {"$lt" : new Date(year, month_0_indexed, day)} })

So for removing documents before 1 September 2013 your command should be

db.user_track.remove( { access_time : {"$lt" : new Date(2013, 8, 1) } })

September is the 9th month but the month field is zero indexed. So we make that as 8.

Answer 2

Mongo has a TTL feature on collections, I think this is a nice solution to such cases:

https://docs.mongodb.com/manual/tutorial/expire-data/

Basically something like:

db.log_events.createIndex( { "createdAt": 1 }, { expireAfterSeconds: 3600 } )

Answer 3

I have found a solution to address this issue .

var date=new Date();
date.setDate(date.getDate() - 1);
db.user_track.remove({"access_time":{"$lt":date}});

I will make this run automatically by putting these lines in a bash file and scheduling that script using a cron tab .

Please share your views if this is a valid solution or not ??

Answer 4

In addition to other answers you may be interesting in the "Time to live” collection feature: http://docs.mongodb.org/manual/tutorial/expire-data/

It's useful to automatically expire/remove documents from a collection after specific period of time.

Answer 5

Probably there is a cleaner solution but this should work:

1. Create new Data field from date strings:

   var cursor = db.user_track.find()
   while (cursor.hasNext()) {
       var doc = cursor.next();
       db.user_track.update(
           {_id : doc._id},
           {$set : {access_time_ : new    Date(doc.access_time)}})
   }
   

2. Now you can retrieve some records by comparing dates:

   db.user_track.find({access_time_: {$lt: new Date("Sep 01 2013 00:00:00 GMT+00:00")}})
   

3. If everything works as expected remove obsolete records:

   db.user_track.remove({access_time_: {$lt: new Date("Sep 01 2013 00:00:00 GMT+00:00")}})
   

4. In the future use date objects not strings