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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Setting up MongoDB MMS on Sharded Cluster

I have followed these instructions to create a Sharded Cluster of MongoDB nodes. https://sebastianvoss.com/docker-mongodb-sharded-cluster.html I now want to setup MongoDB-MMS to monitor these 6 ...
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29 views

Expand a date range in mongodb

I have a document structure like { "startDate": ISODate("2015-01-01T00:00:00Z"), "endDate" : ISODate("2015-01-10T00:00:00Z"), "foo" : "bar" } Is it possible to expand the date range like ...
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57 views

Mongoose populate() and shard key

Our MongoDb setup has a number of sharded collections. When we use mongoose api populate(), it invokes a find() internally. For example: emailDAO.findOne(selector).populate({path: ...
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Service Busy Alarms on USSD GW due to MongoDB

We are getting service busy alarms on my machines which are using MongoDB. When the service busy alarm appears, we get the following errors on our Mongo router logs. The OS on these machines is ...
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2answers
74 views

How MongoDB allocate new data block when data block is full

I am using MongoDB in my project. And I have some questions about how Mongo storage allocated. For example, I have 16MB full data block, and I want to add new document into this data block. - How ...
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1answer
36 views

MongoDB : How to estimate max number of connections supported?

We have a sharded cluster with 2 replica sets. Each replica set is a 3 member cluster with one primary and 2 secondaries. Each instance is a r3.large (aws-ec2) instance with 15G ram. mongos's are in ...
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1answer
105 views

MongoDB document size for collection - impact on RAM and query performance

I have been advised on stackoverflow to ask this question on dba.stackexchange instead - We are using MongoDB version 3.0 with WiredTiger storage. As newbies to MongoDB, we may have designed our ...
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1answer
48 views

Query MongoDB collection and find rows from 7 days ago

I have a MongoDB collection called messages and this is an example document for that collection: { "_id": { "$oid": "551943eee4c6acf40fe5a0f2" }, "sender_id": { "$oid": ...
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57 views

Size of data in secondary exceeded primary after its initial resync from primary in MongoDB

I step down the primary node, deleted its data and performed the initial resync from new primary. But when i checked the size of data after the completion of initial resync, I found that the size of ...
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1answer
251 views

check storage engine from shell

I'm upgrading to 3.0 and ran into some issues with the upgrade. Specifically, I got an error when trying to start up mongod via ssh, it tried to use the default dbpath instead of the one i specified ...
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23 views

Replica Set In Mongo Are All Primary

So I saw a thread on here for when all the replica sets are Primary. The fix was to do rs.Add(hostportStr) on the master server before you do rs.initiate() on the server you want to become a ...
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38 views

mongodb wont read config file using upstart

The problem started where mongo wouldn't start because of low disk space. So I enabled the small files directive in the config file. Now it starts if I run: /usr/bin/mongod --config /etc/mongod.conf ...
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2answers
228 views

Mongos version 3.0.1 Split Chunk Error with Sharding

I have 3 config server and two shards. Each shard has a primary, secondary and an arbiter. This is running with the following mongod settings: storageEngine=wiredTiger ...
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32 views

how to set the permissions for the mongodb packages to run mongo cluster and keep *least privilege principle*?

I followed the instructions of mongodb doc to install the mongodb package on my ubuntu. As a result, the owner of all files in mongodb package is root, and the group is root. I have some questions. ...
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134 views

Mongodb 3.0.1 in ubuntu starts but status, stop or restart show 'mongo stop/waiting'

I am relatively new to Mongo and have installed 3.0.1 on a Digital Ocean droplet (Ubuntu 14.04 LTS). The database starts without problems but I am unable to 'sudo service mongod [stop/restart/status]' ...
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1answer
196 views

MongoDB installation Ubuntu 12.04 LTS errors

I need some help with my MongoDB installation on a clean, fresh Ubuntu 12.04 LTS server with no nonsense installed. I thought it would be a piece of cake, but I got some errors and the Ubuntu-forums ...
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1answer
22 views

Setting up replication for various mongodb micro instances

We currently have 5 mongodb micro instances on aws, each of them serve different modules and the calls are made through REST services. We are planning to setup replication for these instances and my ...
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3answers
348 views

'mongod wiredTiger' on Ubuntu?

I cannot use wiredTiger as a service for MongoDB. Then, I progresses step by step according to the following guide; http://docs.mongodb.org/manual/release-notes/3.0-upgrade/ Step-1: Start 3.0 ...
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1answer
63 views

Is a mySQL or mongoDB relational database scalable for holding 80 GBs of additional logs per day? [closed]

I am currently deciding on a long term architecture solution for storing DNS logs. The amount of data we are talking about numbers some 80 GBs of logs per day at the peak. Currently I am looking at ...
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1answer
105 views

Shoud I uninstall mongodb 2.6 before upgrade to 3.0?

I installed mongodb 2.6 in my machine. This week, I followed the instructions in the subsection of Install MongoDB on http://docs.mongodb.org/manual/tutorial/install-mongodb-on-ubuntu/. I installed ...
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1answer
72 views

In mongodb, drop collections, but still in db.stats() ? In db.stats(), fileSize is greater, greater than storageSize

I used db.coll.drop() to drop two collections in my MongoDB database. There are only system.indexes in my database now. But the output of db.stats() is: mongos> db.stats() { "raw" : { ...
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1answer
172 views

Genghis admin ui not working with mongodb 3.0.1 wired tiger [closed]

We recently updated to mongodb 3.0.1 using the wired tiger storage engine, and have been using the genghis php admin ui through the browser. However, genghis is not completely working now, ...
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2answers
58 views

ElasticSearch: is this problem suitable for ElasticSearch DB? [closed]

I have some hardware instruments each one recording a signal and generating sequences of timestamp/value pairs. Timestamp is a basic UTC posix time and value is a double. I'd like to record such ...
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16 views

Mongo db replication issue in 3.0.0

I updated my replica set from Mongo 32.6.4 to 3.0.0. After that i saw frequent switch between primary and secondary server. When i check the log i found this in log [ReplicationExecutor] replset: ...
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1answer
45 views

MongoDB production security and backup [closed]

I'm quite new to MongoDB and now I was trying to understand the best practices to secure a DB in production and how to automatically backup it. At the moment for security issues I just changed auth ...
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38 views

Get disk usage information of mongodb database

I have a database built in MongoDB and I need to obtain information related to the disk usage of the database through PHP. I have searched a lot but did not find relevant search results for retrieving ...
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1answer
312 views

MongoDB 3.0 : Configure storage engine at collection or database level

I know we can configure the storage engine to be wiredTiger at instance level when we start mongod. But can we also select the storage engine to be different for different collection or database?
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1answer
24 views

How to Import mongodb database from development Environment to local env by using Commmand?

I have lots of collections in my development server. I need to use the same data for testing scenarios. I am trying to import all the data of development environment to local by command is it ...
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1answer
34 views

what is the downtime of mongodb cluster when upgrade to 3.0

I am following http://docs.mongodb.org/manual/release-notes/3.0-upgrade/ to upgrade mongodb cluster from 2.6 to 3.0. The downtime is less than 1 second? because it takes less than 1 sec to elect one ...
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1answer
46 views

how to check and list all the files related to mongodb in ubuntu? I am looking for config files, password informations for mongodb [closed]

I installed the mongodb package in ubuntu using apt following the instructions on http://docs.mongodb.org/manual/tutorial/install-mongodb-on-ubuntu/. I know that binaries are in /usr/bin/, and so on. ...
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65 views

In mongodb, is “sh.getBalancerState() is false” the same as “sh.isBanlancerRunning is false”?

During upgrading config servers to use WiredTIger, I stopped balancer using sh.setBalancerState(false), and then I run sh.getBalancerState(). The output is false. Does this mean the balancer is not ...
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203 views

What's the difference between Object.bsonsize and avgObjSize returned by db.collection.stats?

In my collection, my documents seem to be relatively similar. I need to know how much storage I'll need in my production server to store my documents, that's why I queried : db.collectionName.stats() ...
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2answers
81 views

MongoDb Upgrade from 2.6 to 3.0 Issue [closed]

For some reasons I cannot install MongoDb 3.0 version. What am I missing?
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2answers
426 views

MongoDB does'nt starts after changing the data directory

I have installed a mongodb instance using yum..Now everything works fine.I started the service using service mongod start,it works good.Then i changed the data directory and log path in the ...
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132 views

Mongodb PLAIN authentication failed

I am trying to configure a mongodb server to authenticate an user of a Directory Active. I know that the communication between the SO and the DA is fine because the testsaslauthd works: testsaslauthd ...
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38 views

Trouble starting Service mongodb-mms-backup-daemon

I am trying to install on-prim MMS and backup server. I am able to start the MongoMMS but not the Backup daemon. Below is the error copied from /opt/mongodb/mms-backup-daemon/logs/daemon.log ...
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52 views

what is the password to user mongodb when mongodb is installed in ubuntu?

When I installed mongodb in ubuntu, user mongodb and group mongodb are created in /etc/passwd and /etc/group. But I have no idea of the password to these user and group. I have to run mongod as root ...
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1answer
42 views

While installing Mongodb, getting “enabling http interface” message and stopped

I am getting following error while installing mongodb, $ mongod --directoryperdb --dbpath C:/mongodb/data/db --logpath c:/mongodb/log/ >mongodb.log --logappend --rest 2015-03-17T17:32:55.359+0530 ...
2
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1answer
522 views

When upgrading config servers to use WireTiger, the running config server with wiredtiger does not authenticate the existing pass and user?

In order to upgrade mongodb to 3.0.0, I am upgrading my config servers to use WireTiger. I followed the subsection of Change Config Server to Use WiredTiger. There are 18 steps. I run mongodump --port ...
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1answer
144 views

Why do I have to run mongod as root?

When I run "/usr/bin/mongod --config /var/data/rs1/rs1db0v3.conf". It failes. The error is: warning: bind_ip of 0.0.0.0 is unnecessary; listens on all ips by default about to fork child process, ...
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1answer
681 views

MongoDB Insufficient free space for journal files

I have installed a standalone mongo 2.6 in amazon ec2. The instance has reach the limit of disk space and it doesnt run now. I have set before the smallfiles=true in mongod.conf file, but for some ...
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2answers
577 views

Upgrade mongodb from 2.4 to 3.0

I have mongodb 2.4 database with some indexing. Now I want to upgrade that version to 3.0. I searched on google but did not find any firm answer. I tried installing 3.0 but then it gives me error of ...
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1answer
53 views

In mongodb cluster, Can I shut down one config server and one data server in the shard at the same time

I have one mongodb cluster, including 3 config servers, and one shard (3 data servers in this shard). One data server and one config server are on the same machine. Can I shut both of them down to ...
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1answer
92 views

When upgrading to mongodb 3.0, should I upgrade authentication schema after upgrading the storage engine to WiredTiger? [closed]

I know that, I need to upgrade the storage engine after upgrading the binaries. But I am not very sure whether I should upgrade the authentication after upgrading the storage engine. Or it does not ...
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1answer
1k views

how to upgrade the config servers to use WiredTiger in mongodb 3.0.0

I am reading the document upgrade config servers to use WiredTiger. In the section of "change config server to use WiredTiger", the second step is "stop the last config server listed in the mongos' ...
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1answer
145 views

can we use a mongodb 3.0 and mongodb 2.6 in same replica set?

i know that replicas using different storage engines can coexist in a replica set on MongoDB 3.0 but can we add a MongoDB 3.0 replica to a replica set that consists of MongoDB 2.6 instances ? That ...
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217 views

Mongo db replication issue with 3.0.0

I updated my mongo instance to 3.0.0. Now i am seeing this error continuously in the replica set log 2015-03-12T15:24:23.141+0530 W NETWORK [ReplExecNetThread-74] Failed to connect to ...
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24 views

MongoDB: How to shard based on country name

I am new to MongoDb: I am creating a small use-case where I am streaming Twitter data into my Mongodb. What I want is all the tweets from USA should go to one shard ->shard0000 I did sharding as ...
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32 views

MongoDB 3.0 with WiredTiger restore Ends with unexpected EOF

I've a quite big collection in a mongo database. The Database runs in a cluster of 3 servers With mongodumb -host localhost Z:\MongoDbBackup i create a backup which i want to restore on my local ...
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46 views

Mongodb: Couldn't find mech GSSAPI

I am trying to understand how mongodb works with kerberos. To do that I have configured a kerberos server, just only for local. This is the configuration of my realm: this is the content of krb5.conf ...