MongoDB : Document-Oriented NoSQL Database

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Modeling for inclusion of two different entities

What I Have I am currently hashing out the data model for an application that will utilize MongoDB. In my setup, users or members (as they are called in the schema) will be created and then assigned ...
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111 views

Storing multidimensional array in MongoDB

I am attempting to convert a large MySQL database of product information (dimensions, specifications, etc) to MongoDB for flexibility and to move away from the restriction of a column based table. I ...
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Which database for survey app [closed]

I need to build a very simple mobile survey app. The app will ask for different questions where people can give one of 3 possible answers, which will be always "yes", "no" or "maybe". To save ...
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52 views

MongoDB - sharding

I have a sharded cluster with 4 shards, 3 config databases. My problem is when I do my inserts only one shard gets filled. Can anyone please explain to me why this is happening. My first thought was ...
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24 views

mongodb logRotate on windows server 2008

Running mongodb on a windows server 2008 R2 as a service in trying to do a logrotate for my mongod processes. I currently have a replica set 3 replicas. when i issue the command: (rotate.js) ...
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83 views

Mongos down when I shutdown one of three servers

I deploy 3 server of mongodb, layout is node-01: mongos config server 1 replication server 1 node-02: mongos config server 2 replication server 2 node-03: config server 3 arbiter After ...
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89 views

MongoDB insert performance rapidly dropping

I'm currently experiencing a rapid decrease of the insert Performance. I have a rather simple data model { "Id": "ObjectId", "SomeProp": "xy", "SomeTags": [ { "key": ...
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64 views

Split Vector is taking too much time in mongo shard

I am using mongo shard distribution system. This system performs slow as the data size increases. I checked with profiler and saw split vector is taking to much time while running. It happened after ...
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61 views

Restore backup to staging replica set

I have a staging environment with Mongo replica set which I refresh on a regular basis. Refresh is done automatically using a bash script. Staging replica set consists of 3 members (primary, ...
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123 views

MongoDB - Adding a new server to an existing replica set with auth enabled

Short version: Is there a way to add a new SECONDARY server to an existing production MongoDB replica set without downtime, and without temporarily disabling the "auth" and "keyfile" config settings ...
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79 views

How are Mongodb indexes stored on disk?

So let me first start the question with my understanding of how MongoDb stores data on disk: So when you create a database in mongodb, it allocates a large file named <databasename>.0 and within ...
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55 views

Removing Database from sharded cluster in Mongo DB

I Have a mongo shard db system with two shards and and three mongos servers.My application creates DB on daily basis as per our business requirements. We have some sharded collection in each day DB. ...
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41 views

Collection VS lots of Fields

As of the moment we are having this collections RptCustomer RptCustomerMonthly RptCustomerDaily RptStoreCustomer RptStoreCustomerMonthly RptStroreCustomerDaily RptFranchise ...
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113 views

“Host has low open file limits” error in MMS

I am running Standalone MongoDB (v 2.6.0 64-bit) host on Centos (v 6.5). Centos is guest OS on Windows 7 host running under VirtualBox (4.3.10). MongoDB process runs under root account. And it is ...
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127 views

high background flush avg mongodb

similar question: High Global Lock % on Mongodb Overview We have a production setup replica set in v2.4.8 mongodb running on five 4-core, 28gb RAM VMs with standard azure datadisk HDDs running on ...
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26 views

Admin DB replicated in MongoDB replica set

I'm setting up a mongodb replica set across 3 different hosts. If you create the admin user on one host and turn on auth and keyfile in the /etc/mongodb.conf, do you have to create that same user on ...
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3answers
98 views

Mongo takes too much memory when insert data

I'm using mongo as a database log. I store on it all the logs of an application, so I have a high rate of inserts, for example 100 inserts per second. To accomplish that I developed a part of the ...
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27 views

Merging MongoDB files

Mongo stores data in files named xxx.0 and xxx.ns under the db folder. Is it possible to copy these files to another machine where I have a mongo instance running and merge them to create a single ...
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37 views

Error while changing the authentication - mongoDB

I had database level authentication in mongoDB, I had tried to change the password for existing user. It is throwing not authorized error. Steps i followed to change the password use wallet ...
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1answer
91 views

MongoDB - Query elemMatch Date

Having a document structure like this: { "_id" : ObjectId("5359816b036493327d7cae95"), "_class" : "com.myproject.MyObjectDTO", "signals" : [ { "signalType" : "ABC", "quantity" : ...
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27 views

No connections to mongodb replset member post outage

I have a weird issue in MongoDB. Let me explain. Suppose, I have following components of mongodb: A shard with a replset containing 3 members, with 1 primary(say A) and 2 secondary nodes (say B and ...
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3answers
120 views

How to limit MongoDB database size

Are there any mechanisms to limit the size of a single database on MongoDB 2.6? I found some options like quota, quotaFiles and nssize but am unsure how to use them.
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34 views

What are these files in MongoDB?

I was looking into my server and I found this: [root@host ~]# cd /var/lib/mongo/journal/ [root@host journal]# ls -lh total 3.1G -rw-------. 1 mongod mongod 1.0G Apr 7 01:18 j._0 -rw-------. 1 mongod ...
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101 views

Durability and other limitations in mongoDB?

I've created web app that use mongodb, my mongo database currently has 4,05 GB , but every day it increase, next year it will probably have about 8 GB , I have python scripts that runs every 30 ...
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98 views

SpringData MongoDB - infinite getmore on mongo logs

Doing 2 queries on MongoDB through Spring Data on around 160 000 rows, query 1 is executed in few seconds (about 20 results) but query 2 never finish. I'm getting this line over and over on mongodb ...
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25 views

When enable authenticating in MongoDB, how to use mongo_fdw?

I test mongo_fdw these days, It's ok when mongodb disable the auth authenticate, but if the mongo enable the auth authenticate, should we create a mapping user for the foreign table? what shoud we ...
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45 views

Mongodb replica sets: why does my master server occupy more disk space than my slave?

I have two servers on my replica set. Let's call it the master and the slave, for the purpose of this discussion. The master was the original one, and the slave was replicated from that master. At ...
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308 views

mongodb 2.6 mongos start up failed

I'm trying to run mongodb 2.6, everything followed my 2.4 version setup steps. but when I start mongos I got the following problems and just cannot make it. 2014-04-24T03:38:31.001+0800 [mongosMain] ...
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58 views

Should I use SQL Azure to store product descriptions and links to images in Azure Blob

For an html/Css/JQuery public Azure website to be coded using Zurb Foundation html5 responsive framework, I'd like to use SQL Azure (web edition) to store product descriptions and links to images that ...
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211 views

Error while accessing remote mongo db

Trying to access remote mongo db. Got the following error: C:\Users\ranjj_000>mongo <SERVER_IP_HERE>:28017 MongoDB shell version: 2.6.0 connecting to: 111.93.128.60:28017/test ...
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19 views

MongoDB Writing issue

I use mongodb (2.0.6) on my servers (Debian 7.0). On one of my servers I see something strange... The disk IO is very very high constantly, and when I use iotop I see this: 32704 be/4 mongodb ...
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464 views

Can't take a write lock while out of disk space

Help me please! My C:\mongodb-win32-x86_64-2.4.6\data size is 8G. I have 95G free space of drive C. But I get this message: com.mongodb.WriteConcernException: { "serverUsed" : "/127.0.0.1:27017" ...
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164 views

MongoDB on Raspberry Pi --dbpath not setting

I installed MongoDB using this tutorial. I have tried to set --dbpath in /etc/mongodb.conf like this: dbpath=/path/that/iwant #where to log logpath=/var/log/mongodb/mongodb.log logappend=true ...
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106 views

Mongodb 2.6 Server crash and not restarting

We are using mongodb 2.6 with one Primary and 2 secondaries. One of the secondary has gone bad and not restarting. 2014-04-18T21:13:34.765+0000 [rsSync] replSet still syncing, not yet to minValid ...
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19 views

Upgrade MongoDB meta-data after binary upgrade

I upgraded our MongoDB binaries from 2.2.5 to 2.4.9. I did not follow one of the considerations prior to upgrading: To upgrade to 2.4, sharded clusters must upgrade following the meta-data upgrade ...
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108 views

Are mongodb bulk inserts really increase server perfomance (and faster)?

Bulk inserts always are faster in client side because of saving round-trips, but at the server-side is there any sensible performance improve? It seems the code for bulk inserts, just loops over ...
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85 views

Best design of mongo replica set for DB read/write speed

I'm building a Node app that uses MongoDB. Whilst it would probably be fine to have node and mongo sitting on the same VPS, I want to ensure that the MongoDB is backed up and maintain high ...
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160 views

Mongodb: Waited too long for lock balancer to unlock

Mongo Version: 2.4.5 OS: Windows Server 2008 R2 Standard (Service Pack 1) We have a balancer idling for a day doing nothing (no recent records in changelog), holding a lock state 2. Tried to stop ...
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23 views

How to restore MongoDB production replicas from underlaying files of hidden replicas in case of human error?

When I have backed up files of my hidden replicas, how can I use it in case of human error (e.g. drop db, etc)? I mean, what I have to do to restore data from it? I probably should: stop balancer, ...
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Which version of linux OS has support for MongoDB installation?

I would like to learn how to install MongoDB in my Windows machine. Currently I have a Windows 8 64 bit OS laptop and I installed MongoDB 64 version for Windows. My question is: which version of ...
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28 views

MongoDb Sharding between replica and standalone server

So i got a replica set with three servers and a standalone server . I have enabled sharding between them. I inserted more data on replica primary server using "rockmongo". But the chunks are not ...
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45 views

Is there way to have logical connection in MongoDB?

For example in oracle we can define tns.ora so client can connect with logical name. Although mongos can run on client servers, but when there are many different partner applications we we will need ...
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65 views

MongoDB Synchronizing multiple Shards

I've got the following layout Picture Cluster RZ West is my first data center A and RZ Ost my second data center B. As you can see one secondary database of each cluster is available in the other ...
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3answers
117 views

How can I enter Mongo as a superuser or reset users?

I'm was playing around with permissions and locked myself out of Mongo database. I'm pretty sure I did this by trying to explicitly add access to a database but instead I overwrote only allowing ...
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158 views

MongoDB Document size too large

I'm having trouble with my MongoDB Replica Set. I'm connecting to the server and using the database fine from two servers but on another server I'm getting the following error: ...
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98 views

What mongodb database layout would fit better

I'm currently writing an application using the MEAN stack, pretty much only for fun and because MEAN is "cool" at the moment. Therefore I'm thinking about the database layout. The data needed to be ...
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118 views

Is that possible to backup MongoDB sharded cluster without LVM or mongodump?

There is a "LVM-solution" in MongoDB documentation: http://docs.mongodb.org/manual/tutorial/backup-sharded-cluster-with-filesystem-snapshots/ Can I do the same thing, but without using LVM snapshots, ...
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78 views

Why MongoDB starts to split before 64MB

I'm testing the MongoDB Sharding with a Sharded Collection and a forloop to insert arround 1M documents to see how splitting and moving works. I'm surprise that after few documents MongoDB starts to ...
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178 views

Storing files in Mongo's GridFS vs File System

I read the question here: http://programmers.stackexchange.com/questions/150669/is-it-a-bad-practice-to-store-large-files-10-mb-in-a-database and this paper: ...
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Error with Solr DataImporter using Mongodb

I've configured my environment and I've downloading Solr 4.7 The idea is make an indexing my mongodb database. For this I've installed the mongo-connector like appear here: ...