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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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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279 views

Mongo not using enough RAM, and is slow

Our Production Mongo appears to be behaving weirdly. As far as I have read, Mongo should eat up all the available RAM to cache Index and Data in memory but in our case it is not doing so. Our ...
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514 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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230 views

Store large hierarchy in NoSQL each day and compare

I'm in the process of creating a utility that stores a fairly large hierarchy into a NoSQL document. The data of this is similar to an Active Directory / LDAP structure which contains sub groupings, ...
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138 views

automated data sync after Primary node is down

I have this scenario, using version 2.2.2: Node A, Primary, Priority: 10, Wireless network Node B, Secondary, Priority: 9, VM Server1 Node C, Secondary, Priority: 8, VM Server1 Sequence: In Node ...
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11 views

Creating Pandas DataFrame on Python From a MongoDB Document containing Embedded documents

I am working on a machine learning algorithm on python's scikit.learn, but this time the data are in Mongodb documents format. I would like to pull my data into a dataframe. Here is an exemple of the ...
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18 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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21 views

Issue running MongoDb 3.0

Was original running MongoDb 2.4 on Ubuntu 13.10. Upgraded MongoDb to 2.6. Upgraded Ubuntu to 14.04. Upgraded MongoDb to 3.0. However everytime I issue "mongod --config /etc/mongodb.conf", I am ...
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36 views

Mongo 3 Intermitted Crashes

Currently running two VMs with fresh installs of Ubuntu 14.04 x64 and Mongo 3 Stable. Each VM has the same specs with 8 cores and 56GBs of RAM. Our processing VM is doing great under heavy loads, ...
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27 views

Mongodb schema design validation

I am building an app which allows users to do some "tasks" to earn points. The "tasks" are part of a "campaign" which themselves are a part of "brands". I am confused about the schema for storing the ...
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34 views

Good way to store daily train data in MongoDB

I am preparing to collect large amounts of information about trains in my country. Each train in my country has a number. I've already collected all of these numbers. There are about 4000 of them. ...
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16 views

why my data is not being sharded?

I am using mongo 2.6.7 I deploy a sharding cluster follow the guide: http://docs.mongodb.org/manual/tutorial/deploy-shard-cluster/ My sharding cluster include: - two replica sets (one primary + one ...
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72 views

How I can create user defined roles

I have a database in mongoDB 2.6.4 in which I want to restrict the users as per their level. I want to give read privileges to some users and insert/update privileges to some other users on a ...
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49 views

Nosql multiple database design to handle sharing scenarios

This question is regarding design of a database in mongodb. The scenario: A user has a drive which he can share with others. Drive has two categories: docs and others. The user has three choices in ...
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51 views

MongoDb Volume alert so much iops(>10000)

I am new for MongoDB. I have setup mongodb for my production server. I have setup alert in aws ec2 instance for iops and it gives me alert every 15 minutes that iops reached at > 10000. I am not ...
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83 views

Pentaho Kettle (Data Intergration) MongoDB Aggregation

I'm using kettle v5.2 which support the aggregation pipleline in MongoDB when using MongoDB input the query works for small data set but I need to use option allowDiskUse to the query can't figure ...
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710 views

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

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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108 views

Replica failed with error mongo db

I am running mongo sharded cluster with two replica set as shards. One set is working fine but replica secondary on other replica set is not working. When ever i restart it it gives me this error and ...
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48 views

Mongo stuck on save

We have a single node of Mongo holding data in a single collection. We run it on windows 2008 64-bit machine with 128 GB RAM. The size of the collection is ~2TB holding ~200M items. Lately, when we ...
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242 views

Positional Operator Matching Nested Arrays Workaround?

As was just pointed out to me on stackoverflow, Positional Operator Matching Nested Arrays has yet to be made available.. I need to display read.marked:true replies differently than read.marked:false ...
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67 views

MongoDB read performance

I have an ingestion process which loads data into a specific collection at a very high rate. Some of these documents have to be loaded into another system in batches of 100K . Means as soon as I find ...
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52 views

How to check which sql statement is causing global lock

We are monitoring mongodb Database using MMS and it is showing 15-20 sec global lock. But we can't find any statement is taking more than 2-3 sec. I like to know which is causing so much global lock ...
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246 views

MongoDB communication issues on Azure

I have a Python uWSGI app running behind Nginx using pymongo to communicate with a 4 machine replica set running Mongodb 2.6.3. The replica set is configured using domain names for each machine ...
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93 views

mongodb replicaset

I am adding a new member in ReplicaSet and it starts initial sync bur after certain point sync break and start resync again.this process continue and never complete its initial sync.so please resolve ...
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294 views

Error to connect mongos when trying to create replicated sharded cluster

I'm trying to create an replicated sharded cluster in mongodb. Initially I've created two shards and there are a replica set with three members in each shard. And all the shards and replicasets run in ...
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20 views

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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246 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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505 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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60 views

mysql vs mongodb cache/load balancing

I have a system where users can 'like' content. There will likely be many hundreds of these likes going on at once. I'd like it to be AJAX driven so you get an immediate response. At the moment I ...
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307 views

MongoDB performance limits of mongo

There are 100 data files, each with 60 fields and over 4 million records. There is a perl program that inserts the records or updates them based on an userdefined _id field. There is also a History ...
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129 views

MongoDB secondary heartbeat hangs

We have got the same issue in two replica sets in AWS cloud. According to rs.status() on primary secondary jumping between SECONDARY and unhealthy states. With period of 10-20 seconds. In logs I see ...
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199 views

How can I use mongoDB efficiently in this scenario?

I'm trying to build a system of documents that have hundreds of tags assigned to them, but each document-tag association has a certain condition it has to also meet so the document would be returned: ...
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6 views

Mongo Shard with Negative Average Size?

I'm seeing the following behavior from a shard in mongo: mongos> db.fs.chunks.getShardDistribution() Shard SH0 data : 740.29GiB docs : 5003098 chunks : 32949 estimated data per chunk : 23MiB ...
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12 views

Mongodb: How to resolve startup2 state

I have a shard cluster. Each shard consists of a replication set with one Primary node and an arbiter node. There is a large number of data in each shard. The host of a Primary of a shard crashed ...
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14 views

MongoDB “overacts” on cleaning/flushing and finally hangs up

Recently I run several times into trouble with mongodb that exhausted my system. The database is tiny, after a mongodump, all files together weight 248KB. After some hours uptime it happens that the ...
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0answers
15 views

How to interpret Mongo MMS Stats?

The following image contains all of the charts from the Status tab in MMS. How does a noob looking at these charts navigate these waters, so to speak? The mongo box is a standalone installation ...
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6 views

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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12 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 ...
0
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0answers
15 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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3 views

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 ...
0
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0answers
10 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. ...
0
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52 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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0answers
9 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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26 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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0answers
72 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 ...
0
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0answers
74 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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17 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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32 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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0answers
97 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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0answers
84 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 ...