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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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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16 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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17 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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21 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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25 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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46 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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41 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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128 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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56 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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83 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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57 views

MongoDB Replica Set: Can't Add Member/Connect

I'm building a MongoDB replicaset w/ three Ubuntu 14 servers. I'm connected to the primary server and authenticated w/ userAdminAnyDatabase and clusterAdmin privileges. When I run ...
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94 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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17 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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98 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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47 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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158 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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247 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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43 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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195 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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98 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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162 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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51 views

Add new shard - always best?

In our setup, we currently have 3 shard set sharded cluster, each shard being a replica set of 3. Our writes are about to go up significantly to implement a new feature, and we know the extra data ...
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7 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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6 views

different php files on same mongoDB connection in php

I am new to both PHP and mongoDB. I want to know if there is any way to run a PHP project having different files on a single mongoclient(); I have created one connection.php file which is used for ...
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12 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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19 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 ...
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25 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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24 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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42 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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13 views

How to modify the chunk size in a MongoDB sharded cluster?

I'm trying to modify the chunk size of a MongoDB sharded cluster. The problem is that it doesn't look to take my change into account. It keeps on filling 64MBs chunks. I even deployed a new dev ...
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23 views

Books on mongodb data migration

Thanks for reading this post. I have no db/dba background and just started evaluating mongodb for our project. Could someone share experiences of migration data in mongodb? for example, today's ...
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24 views

Mongodb x509 certificate for client and cluster member

I am newbie to mongodb, i understood the concepts and architecture in mongodb document. I would like to setup (1) mongodb server and cluster members (2) x509 SSL security for the server, client ...
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15 views

Mongo Sort By Added Fields

I'm using MiniMongo which means I won't be able to use aggregations. I'm wondering if there's a way to do this without. I'm basically trying to sort rows by two values, foo and bar. Both are ints, ...
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28 views

MongoDB thinks it's running a replica?

I'm running MongoDB (version 2.4) behind a Django application served by Apache. In the past few days, I'm seeing the following error come up many times an hour in the Apache logs, on all sorts of ...
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20 views

users and roles in mongodb

Following users are created in mongodb. First user created with name "user" having read write role for "project" database use project db.createUser( { user: "user", pwd: "user123", ...
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26 views

Exception in 'hibernate.ogm.datastore.database'

I am trying mongodb with hibernate-ogm i am completely new for hibernate-ogm i have stucked with following exception. I am using hibernate-ogm 4.1 6beta version and mongodb-ogm-hibernate.4.1 jar. ...
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12 views

where did my mongo databses go?

I have various Mongo databases and when I do ls -l in my CentOS linux I can see the databaseA.0 and databaseA.ns files for each database and the file size is large enough to tell my data is still ...
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13 views

Documents with many potentially overlapping geolocations (maybe MongoDB)

Let's say I have a large list of coordinates coupled with the type of building is at this location (e.g., restaurant, doctor's office). In this scenario, there would potentially be many different ...
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22 views

Why does a mongo connector need 5% of server memory?

I have 2 servers, one running MongoDB, and the other running a Clojure app. The Clojure app makes some calls to MongoDB. If I ssh to the server running Clojure and run htop, I see: 28961 das ...
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42 views

mongodb import … taking very long time

I have json file of 432.6 MB, which i am uploading to mongodb database, I have mongodb setup on my OS X 10.9.4 mongoimport -d fastqdb -c seqcol --file /Users/loginname/FASTQ.json --jsonArray ...
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93 views

Failure dialing host after a time, skipping all tasks. Err: `no reachable servers`

I have been using MMS and there're 3 hosts based on Windows for monitoring. They're replica set with 1 primary and 2 secondary. Everything is OK for a long time. Recently, MMS has sent me too many ...
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64 views

Mongodb is taking up 7GB of hard drive space on VM, how do I fix?

I am running Debian on a VM. I installed mongodb and it is taking up A LOT of space. It is really slowing me down in college, with work and projects ... etc. I have a disk usage analyzer and I've ...
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29 views

Add a member in mongo db replica set

I Have Added A new Member in Replica set.And It Starts initial sync But After some point it will start resync again and again. And Log file show [rsSync] replSet initial sync pending Sat Jul 19 ...
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41 views

mongodb master slave replication

I Have Setup master slave replication in mongo its working fine for few month then after that suddenly replication fails.I have started again with initial sync but during sync after a specific point ...
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25 views

Mongo - Fetch results sorted by the number of matching values in an array object

I have a mongo Database with collections such as : [{ _id : 'one', tags1 : ['A', 'B', 'C'], tags2 : ['D', 'E', 'F'] },{ _id : 'two', tags1 : ['A', 'Z'], tags2 : ['D', 'F', 'G', 'M'] } ...
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46 views

mongodb balancer does not move chunks because of obscure error

After carefully following this guide, on how to migrate a 3 member replica set to a shard containing 2 X 3 member replica sets, after sharding one of my collections nothing happened. Looking into the ...
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26 views

Searching larger documents

I'm currently developing an application where I want to use MongoDB for the main database. I'm trying to store the emails metadata inside the database. My schema: user_id (integer 32bit) -- index ...
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37 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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46 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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35 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 ...