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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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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14 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
34 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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30 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
203 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
17 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
27 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
38 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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52 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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1answer
104 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
65 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
184 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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102 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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27 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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41 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
30 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 ...
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1answer
347 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
75 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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388 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
351 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
39 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
73 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
724 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
90 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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145 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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16 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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28 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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1answer
36 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 ...
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23 views

MongoDB shard not working

I have a mongoDB cluster of 3 replication sets Getting this error: id_ObjectId('54f9ed416aad853b66d0c21f')", configdb: "172.31.12.107:27019,172.31.12.93:27019,172.31.12.43:27019" } result: { ...
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26 views

MongoDB with WireTiger Extract Data from Collection FIles

Is there a way to get data from a wiretige (*.wt) collection file ? I've a corrupted database and need the data of a single collection. I tried mongod --repair but didn't help i got various ...
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1answer
77 views

Mongodb update conditional set operator ($set only when it is insert )

Is there anything in Mongo update where $set when will work only when an insert is done. example is I have a collection which has these fields: Username FirstOccurrence Count What i want that i ...
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38 views

MongoDB replica set with arbiter

I'm trying to configure a replica set in MongoDB 3.0 with two replicas and one arbiter, but it's not working as expected. As you can see in the following pictures each instance tells a different ...
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17 views

Taking more time for execution

I am trying the below loop with inserts under Mongo 2.6 (windows) environment and it took nearly 30+ minutes for completion and also created an index as well during execution automatically.. I am bit ...
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1answer
61 views

MongoDB on RAID0?

As I'm reading production notes of mongodb I found that RAID0 is not recommended: Most MongoDB deployments should use disks backed by RAID-10. Avoid RAID-0 with MongoDB deployments. While RAID-0 ...
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1answer
48 views

Mongo repairDatabase procedure

I need to run a repairDatabase in mongo in order to reclaim some os disk space. Can anyone provide feedback on the following procedure: let me know if its correct, if I'm missing anything, if the ...
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1answer
20 views

MongoDB failover reasons

I have a replica set on MongoDB with 3 members - primary, secondary and arbiter. One day I came and saw that primary and secondary have switched. I'd like to find a reason for the failover that caused ...
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150 views

Mongo range query became extremely slow on large collection

I have a collection which has 50 million records in it. After using wired Tiger its size became only 3 GB (2 GB data 700 MB index). I have created index on this collection. But when i do a range query ...
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45 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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1answer
17 views

Multiple databases through a single connection MongoDB, GridFS

I want to use GridFS in your project. As the main database using mongodb. My application can do only one connection to the database (such conditions). Can I make calls to other databases using the ...
0
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1answer
307 views

Mongo Db server status with wired Tiger

I was testing my DB with Mongo 3.0 wiredTiger setup. After restoring my database with wiredTIger i ran db.serverStatus. I found following in console output. "bytes currently in the cache" : ...
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2answers
66 views

Does MongoDB support two 2-way synchronization

We are looking at moving our data from IBM Domino to another backend. One of the things Domino does really well is replicate (or synchronize as they call it) between a Server and Clients. That means ...
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0answers
67 views

Mongo DB accessesNotInMemory issue with RAM size

I am using Mongo Replica set and it seems to be working fine but when i check db.serverStatus i saw that there are lots of accessesNotInMemory for all The DBs in my mongo instance. I checked MY RAM ...
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1answer
35 views

Mongo 3.0 release for Cent OS

Can any one tell me When Mongo team will release 3.0 production release. Also will it be available for cent OS as we are shifting g our production boxes from RHEL 6 to cent OS and on Mongo Download ...
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27 views

How to create and select entities in MongoDB?

I'm a newbie in MongoDB and I'm trying to understand how to create objects there and how to select them in comparison with relational databases. So I need an example how to perform these things. ...
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1answer
41 views

Error while doing in replicaset in windows (mongodb)

I tried doing the replicatset in windows, but im getting the below error. I checked the mongo process and killed the existing process. Even though the error exists. help me on this pls Thx ...
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21 views

How the statement based replication works internal on secondary node of mongodb?

Mongodb supports statement-based-replication. Would like to know, how the statement based replication converts the code internally on secondary node of mongodb. Is that working related to the ...
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1answer
31 views

Sorting on compound Indexes

This may be a novice question but could it be possible query here. If I have a compound Index as { a: 1, b: 1, c: 1, d: 1 } Is this query possible? db.data.find( { a: {$gte:1,$lt:2}, b: { $gt: 3} ...
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32 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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0answers
14 views

MongoDB sharding one collection on single server (2 drives)

I have one single server with two drives (SSD 256GB, HDD 1 TB). What I want to do is to store the newest documents in collection on SSD. Older documents can be stored in HDD drive. Is it possible in ...
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16 views

Can we resize a already capped collection in mongo db [duplicate]

I have a capped collection whose initial size i gave 3 GB. Can I modify its size again i mean reducing or increasing both way as per need? is there any command to do it. ...