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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
296 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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1answer
88 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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2answers
3k 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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52 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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1answer
71 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
1k 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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52 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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419 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
325 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
26 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
2k 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
78 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
181 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
252 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
340 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
92 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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30 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
110 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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0answers
44 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
1k 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
74 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
65 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
86 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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2answers
168 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
885 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
226 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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6answers
5k views

MongoDB doesn't start 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 well. Then I changed the data directory and log path in the ...
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0answers
258 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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0answers
78 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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295 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
182 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
1k 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
1k 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, ...
2
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1answer
3k 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
2k 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
222 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
205 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 ...
2
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1answer
3k 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
501 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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0answers
817 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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0answers
43 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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49 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
140 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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44 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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0answers
99 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
407 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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0answers
113 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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40 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
138 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 ...