MongoDB is a scalable, high-performance, open source, document-oriented database. It supports a large number of languages and application development platforms. Questions about programming should be asked on http://stackoverflow.com.

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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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1answer
107 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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1answer
107 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
1k 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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1answer
34 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
1k 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.
2
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1answer
204 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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2answers
731 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 ...
2
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1answer
661 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 ...
3
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2answers
147 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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1answer
1k 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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1answer
973 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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1answer
1k 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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1answer
485 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 ...
2
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1answer
755 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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1answer
32 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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0answers
788 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 ...
2
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1answer
436 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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1answer
108 views

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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1answer
67 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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1answer
55 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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2answers
102 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
5k 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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1answer
694 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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1answer
233 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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2answers
517 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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1answer
285 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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0answers
1k 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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1answer
564 views

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: ...
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1answer
135 views

Mongodb crash after multiple query attempts

Every once in a while our mongo service crashes () after displaying log of multiple messages like this: Sun Apr 6 01:11:38.648 [conn2149] getmore prod_db.tweets query: { query: {}, $snapshot: true ...
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1answer
120 views

Selecting, filtering and aggregating in MongoDB

if we have two dataset 1-First dataset contains population data of cities in the United States of America. Each record in the dataset has the following format: { "city": "ACMAR", "loc": [ ...
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1answer
112 views

mongodb Date strings and other issues

I asked a question on Stackoverflow, and was told that my schema was way off. I am using mongodb to store whether or not a log file exists. The log file contains info for an hour. I'm not actually ...
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1answer
243 views

Database Design for NoSQL Fantasy Baseball League

I am trying to create a proper schema to place scraped data into, using a MongoDB database. Currently it looks like Team { id : id, name : String, teamLink : String, username : ...
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0answers
263 views

MongoDB Sharding and Replica Set Allocation

I am going to setup MongoDB cluster: 3 config servers, 3 routing servers, 2 shards (replica set per shard). A replica set is just simply 1 primary, 1 secondary and 1 arbiter. Therefore, in my ...
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1answer
164 views

Maintaining mongodb for a huge list of message “documents”?

Intro: I am working on an app right now for live messaging and it's almost complete. The database strategy is in order. So when a new message is created it is sent as an object fitting my mongoDB ...
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1answer
92 views

What synchronizes two delayed replicas, which is part of the replica set, included in sharded cluster?

Please take a look at my mongodb map at http://postimg.org/image/krzvmep4d/ What synchronizes two delayed replicas, which is part of the replica set, included in sharded cluster? How can I use my ...
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3answers
551 views

How MongoDB indexes differs from MySQL indexes?

I am a newbie to MongoDB. I know how Indexes works and what it's importance in MySQL. Are MongoDB indexes are the same as MySQL ?
3
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2answers
332 views

Running MongoDB and SQL Server on the same host- memory pressure

We have a new application that is making use of both traditional MS SQL and MongoDB for data storage. We're running both instances on the same Windows 2008R2 x64 machine, with 64GB RAM. There have ...
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1answer
1k views

Query array of arrays in MongoDB [closed]

I have the following document in a mongodb collection which represents a Snort rule parsed with the perl Parse::Snort library: { "_id" : ObjectId("5328b974be4ed1400900000a"), "dst_port" : "6000", ...
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0answers
99 views

Script to query MongoDB with PHP [closed]

With Code Igniter and MySQL I do: $this->database->query('select * from table'); But I don't know how to use MongoDB. Can I still use this the same way to query MongoDB? ...
2
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1answer
453 views

Can arbiterOnly replica in MongoDB become SECONDARY and what it means?

The MongoDB documentation says that when a replica is added to the set as arbiterOnly=true it will not become Primary. But can Arbiter become a secondary and what does it when it does? I have a ...
2
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1answer
221 views

How do I add a user that has read access to only ONE database?

I have two databases admin and testdb ; Added a user Alice in the test database db.addUser( { user: "Alice",pwd: "Moon1234",roles: [ "readWrite" ] } ); But when I login using the user Alice, I can ...
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1answer
390 views

How can I Automate MongoDB schema design from existing MySQL Database and Logs?

I am working on the project which will automatically generate sample MongoDB schema analyzing existing MySQL database and logs. I am looking for help regarding the below questions. Please, share your ...
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1answer
2k views

Best Approach to storing chat history?

I'm building a chat application (Yes, another one :P) and am really curious about the best way to store a chat's history(String username, String Message, Time, and possibly string channel depending on ...
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1answer
298 views

MongoDB text index and text search

I have a mongodb collection db.articles,it has 2 keys ,"title" and "abstract".I want to do text search on these two keys.For example, the search text is "physics",and I want all the documents whose ...
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2answers
408 views

Mongodb ubuntu - config server and shard together

I have the following services on a single shard server: sudo mongod --dbpath /data/db/ --port 31001 sudo mongod --configsvr --dbpath /data/configdb/ --port 21001 The same server is using for shard ...
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1answer
2k views

How do I (safely) kill long running operations in MongoDB?

Occasionally operations get out of control in MongoDB and might end up running for hundreds of seconds, and impact performance until they are killed or completed. When that happens, I know I have ...
2
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1answer
3k views

How to create an efficient, scalable, multi-tenant data layer using MongoDB? [closed]

I'm working on the architecture for my upcoming Project Mangement app (as an example) and I'm seeking clarity on how best to design the MongoDB data layer, with specific regard to multi-tenancy. The ...
2
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1answer
1k views

mongodb distinct() in an array

In my mongodb database,there is only one document below: { "_id" : ObjectId("5226efc5ccf23796f9590f67"), "count" : NumberLong(126045), "eissn" : "1466-5034", "grade" : 0.0, ...
2
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1answer
438 views

mongosniff is missing in mongo package

I installed mongodb-10gen version 2.4.6 in Debian. This package does not include mongosniff. How can I install a pre-built version of mongosniff in Debian ?