All versions of MongoDB - a scalable, high-performance, open source, document-oriented database.

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Problems in sharding in mongodb

I am currently working on sharding. I have certain issues related to sharding : 1.If I load data again to a collection which is already sharded, the data stays only in one shard and not migrating to ...
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1answer
86 views

Migration of chunks not taking place in sharding

I am trying sharding in MongoDB. I am working with 1 config server 1 Query router 2 shards I tried hash based sharding. The data is getting partitioned but sharding is not successful. In one ...
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2answers
326 views

Standalone MongoDB to MongoDB Shard Setup

I'm learning MongoDB currently so maybe the title of this question is worded poorly, but I'm looking to understand the scaling of Mongo better. I did some research on what DB would be best for my ...
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1answer
488 views

MongoDB can't add new replica set member [rsSync] SEVERE: Got signal: 6

I have a replica set and I added a new member to the set. The initialSync begins for the new member and rs.status (on primary) shows STARTUP2 as status. However, after a long enough time, there's a ...
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1answer
153 views

Is possible to bypass the 32 bit limitation in MongoDB?

Can you help me please? I have got server for research purposes, where I have used MongoDB. But in this time size of my data exceed 2 GB limit. I do not any possibility of migrating to 64 bit. version....
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1answer
178 views

How to configure maximum number of connections of MongoDB server on Windows?

I need to run a Java program that have massive amounts of read requests from a Mongodb instance hosting on a Windows machine. How can I boost the speed to read? I googled similar topics but they are ...
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1answer
42 views

Re-posting schema

I'm building a social network very similar to Twitter, in which users can see a feed with content posted by users they follow. Users can like and re-post (i.e. "Retweet") posts. Re-posted content ...
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1answer
197 views

Mongo Replication with VIP

Have anyone implemented Mongo replication using replset arbiter. At the time of fail-over from Primary to Secondary, Arbiter should bring down VIP on primary and enable on secondary when Arbiter ...
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1answer
1k views

mongodb shard chunk migration 500GB takes 13 days - Is this slow or normal?

I have mongodb shard cluster, shard key is hashed. It has 2 shard replica sets. Each replica set has 2 machines. I did an experiment by adding another 2 shard replica sets, and it starts to rebalance....
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1answer
61 views

what is so special about MongoDB indexing?

I was reading the MongoDB documentation, where it lists Indexing as an special feature. But after reading the doc, I still can't see what it is that makes MongoDB index special. Anyone can explain?
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1answer
23 views

Search result from two collections

I'm new to MongoDB. Lets say I have a collection of blog post, and a collection of authors. I want to search for posts e.g. by topic, and language. But I only want results by certain authors, e.g. by ...
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1answer
4k views

Issues with self signed certificates, SSL and MongoDB

Note: As specified in my comment I've figured out a solution to this issue regarding a single client/mongo connection. The next step is to figure out a solution for a replica set involving this fix. ...
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1answer
790 views

MongoDB replica set - no election after primary node failed

For testing I killed the primary node of my two-node replica set while the cluster was under heavy write load. I was expecting the secondary node would take over after a few seconds, but this isn't ...
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0answers
303 views

MongoDB status says all 3 replica are secondary

I've been testing usage of the replica set feature in MongoDB. This morning I tried connecting to the DB, and found that I wasn't capable of doing so. I consoled in to get the rs.status() and got ...
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1answer
62 views

How to isolate 1 MongoDB config server

I need to preform a rolling upgrade on my MongoDB. I've been all over the Mongo documentation and I can't find a solution to my problem (if there is one) Here's a simple sketch of the Architecture: ...
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2answers
356 views

One of databases in MongoDB suddenly gets high lock %

I observe repeatable, sudden, short-time update queries slowdowns in MongoDB cluster for single database. That slowdowns lasts about 30 seconds and repeats few times a day. I found that lock % and ...
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1answer
95 views

What can cause mongodb used memory to increase?

We have a MongoDb instance which contains two main db use about 30G of disk. >show dbs; admin (empty) l_comment 17.945GB l_recommend 15.946GB lifeix_relation 1.953GB ...
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1answer
53 views

Mongostat shows 2 updates on Primaries when insert data

When i insert data to a mongo sharded cluster it shows 2 updates on the Primaries (check localhost:55030). Does anyone knows where these updates come from? I only do inserts using for (var i = 1; i &...
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1answer
221 views

MongoDB Benchmark with write-intensive on geo-indexed DB

I am using PostgreSQL 9.3 on AWS RDS to store geo information into an indexed table of points. My data is write-oriented, meaning that I write nearly 1,000 points per each geo search query. I am ...
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1answer
86 views

MongoDB:Read from slave dirctly,how to guarantee that the data is just up-to-date?

I know that MongoDB is the master/slave architecture,to make the read faster,some read request is directly sent to slaves.But since it is a distributed system,when the data is write to a master,the ...
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1answer
224 views

MongoDB failover process

Hello guys I've been all over the MongoDB documentation (http://docs.mongodb.org) and I can't find a solution to my problem. Imagine the following scenario: I have 2 Nodes (1000Km apart). Both nodes ...
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0answers
2k views

Mongo client cannot connect on first try in bash script

I'm working on a bash script for automatic MongoDB server installation and user creation. #!/bin/bash apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10 echo 'deb http://downloads-...
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1answer
546 views

Is it correct to use IP addresses (instead of hostnames) while configuring Mongo DB cluster? Does it cause any issues?

I have been using Mongo DB Cluster for some data analysis (Mongo DB version 2.4.5). My configuration is as follows: 1) Node1 - mongoconfig server, mongod shard 2) Node2 - mongoconfig server, mongod ...
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1answer
1k views

Socket recv() timeout on secondary nodes

We started using MongoDB pretty recently. We are on version 2.6.3. We have a replica set of 4 nodes (1 Primary + 3 Secondary) We are currently seeing some latency in replication. The Secondary nodes ...
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2answers
115 views

Mongodb - see when a database was dropped

I want to know if there is a way to see when a database was dropped. Is there an entry in a log file or some other way to see when this occurred
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2answers
206 views

MongoDB replica sets and data duplication

I am new to MongoDB and trying to understand replica sets. Specifically, I am trying to understand how MongoDB would handle the following situation: A record is written to a table with a unique ...
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938 views

Linked Server in SSMS 2014 - Shared Memory Provider, error: 0 - The pipe has been ended

I'm trying to connect to Mongo database from Microsoft SQL Server Management Studio through Linked Servers using Mongo ODBC Driver. Right now I'm testing Easysoft ODBC Driver. I can connect to the ...
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1answer
3k views

Mongo DB Replica set Stuck at RECOVERING state

We have created a replica set and now the problem is 2 members of replica set [3 members set] are in recovering mode from 48 hours. Initially the size of recovering nodes was increasing and now even ...
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2answers
37 views

MongoDB: how to get the all the embedded data?

I have this data: > db.Category.find().pretty() { "_id" : ObjectId("542450a928db034349fb3bf2"), "name" : "A category", "products" : [ { "_id" : ObjectId("...
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1answer
3k views

Searching for array elements nested in MongoDB Documents

I need to store card documents in my database. Cards need to be stored with a set of integers that represent the bundle, box and pallet, or whatever other entity they belong to. The packaging ...
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1answer
264 views

Mongodb deployment best practice for dual nodes?

I have two nodes and I'd like to deploy mongodb on them. It seems there're two methods: Deploy as master-slave. But it's marked in the official document as "legacy". Deploy as a replica set. But a 2-...
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1answer
108 views

Storing not very volatile information in database with cache or mongodb

For a new project I'm working on right now I was doubting on which database/storage system to use for specific information which does not change that often. We have for instance some company-...
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4k views

How can I load csv data into mongodb and choose the types I'd like to have created for each column? [closed]

I'm looking for a way to load csv data in mongodb and specify the types that I'd like to have created for each column? I've been using mongoimport but I find it quite painful because there doesn't ...
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1answer
292 views

MongoDB - Replica sets - Syncing and DC issue

I have 3 instances of MongoDB running on my local machine. One is native and the other two are on a Virtualbox Windows 7 VM. LocalMongo = My local mongo. VM1a and VM1b = My two instances of mongo ...
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2answers
1k views

Update tag range on MongoDB range shard

Let say I set a min and max key for shards using range tags. Later I find out that the tag range I defined will not balance. Then I have to change the tag range value. I have searched MongoDB's ...
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0answers
359 views

Error while creating an admin user in replica set

I have a relatively simple replica set test setup between two VMs and my host machine, with VM1 as primary, VM2 as secondary and the host as arbiter. I have mongodb 2.6.4 installed on all machines. So ...
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1answer
82 views

Several mongod instances that do automatic failover without duplication of data?

Because we don't have much storage space and we already have a RAID system for data availability, we don't want to use mongodb's replication set with duplication of data. I just want to know if ...
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0answers
304 views

Slow insert with Mongo 2.6.4 update

Hi I am having an issue with mongo version 2.6.4 my insert queries has became extremely slow after update when i check log on primary i got this 2014-09-16T16:40:18.576+0530 [conn51476] insert ...
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1answer
68 views

MongoDB Configuration [closed]

I am new to MongoDb, I have 1 TB of Data in JSON format, what should be the processor speed, RAM, disc space required, network bandwidth for maximum of 10 concurrent users for production environment.
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486 views

How to access the data of collections from the .ns and other core storage files in mongodb?

My database in MongoDB was not accessible after the journal file became of the size > 1 GB . So I restarted the mongod process with a different data path to store the mongodb files in my machine. Now ...
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1answer
194 views

Upgrade lock from mongo 2.4 to 2.6 wont go away

I have upgrade 3 months ago a mongoDB sharded cluster from 2.4.9 to 2.6.1 . I haven't faced any issues with the upgrade and my cluster working fine, but i still see the initial lock that required to ...
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2answers
62 views

MongoDB Non Sharded Environment

We are planning to setup non-sharded MongoDB Instance on Amazon AWS. As per my understanding we need MongoD setup on Primary and Secondary to forms as a replica set. Please advice if we need MongoS,...
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325 views

create an automatic synchronized copy of data base

I have a system dsn(sqlserver odbc) configured on my computer. The DSN has multiple views of very large size. I want to create a local db that copies the selected view and keep it synced with the DSN....
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0answers
1k views

Understanding two types of mongodb log entries for bulk inserts

I have an app which does regular (every 2 minutes) bulk inserts to two identical instances of 2.6.4 mongodb on two servers. Both the instances are hosted on 2 Core, 14GB machine and have only one ...
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1k views

Mongodb extremely slow with bulk inserts and showing erratic behavior

I have been massively frustrated by the erratic behaviour of Mongodb's bulk inserts. I'm trying to write 20K documents in a bulk-insert query. Sometimes the inserts take as low as 5 seconds and ...
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1answer
3k views

Difference between mongod and mongodb upstart jobs

I just noticed that there are two possible ways to start mongodb: service mongodb start (uses /etc/mongod.conf) service mongod start (uses /etc/mongodb.conf) Can someone tell me what's the ...
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1answer
676 views

Long running query on replica worker set in mongo

Hi I updated my mongo version from 2.4.to 2.6. Now when i see current op in mongos it shows me some queries which are running for long long time. one example is { "opid" : "...
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1answer
304 views

How to config mongo on a remote server?

I have two servers, one for app(rails) and one for db(mongo).My rails config for mongo will be like this(yaml file): hosts: - xxx.xxx.xxx.xxx:57777 database: admin username: root password: ...
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196 views

Index intersection issue with Mongo 2.6.4

I upgraded my system with 2.6.4 binaries to use specifically index intersection. But when i tried this my DB got down. I created these indexes in my collection "a_1_b_1" : 1.2 GB, "c_-1" : 500 MB ...
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2answers
5k views

How to backup large MongoDB database

What is the recommended way to back up large data sets in MongoDB? Let's say we have a data size in the order of 10TB - how would you back that up? We're considering a hidden, possibly delayed, ...