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Questions tagged [mongodb]

MongoDB is a document oriented database (also known as NoSQL database).

MongoDB is a document oriented database. It's coded to be fast, scalable and supports natively solutions like sharding, replication, Map/Reduce and storage of files on the DB.

MongoDB doesn't uses SQL, making it a NoSQL database, its data is retrieved using a dynamic query system and returns JSon-style data.

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Can't config replica set using MongoDB 3

I'm trying to create a replica set in MongoDB version 3.04. I followed this tutorial and getting the next error while trying to add nodes using the primary server: vacrep:PRIMARY> rs.add('server address here') { "ok" : 0, "errmsg" : "Quorum…
Ofir
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Corrupt WiredTiger MongoDB files

I'm running MongoDB with the WiredTiger engine on an ext4 file system. The last thing that I did was start building an index, but then something came up and I needed to cancel the index build and restart the machine. I did this by hitting Ctrl+C in…
Hut8
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MongoDB Oplog Security

We are using a MongoDB replica set for sharing sessions and other (potentially sensitive) data in a web farm. All the data we store uses TTL indexes to expire documents after a relatively short period of time (say an hour) partly for security…
Alistair Evans
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Readahead for /var/lib/mongo is set to 4096KB

I'm trying to set the readahead for mongo 256 or less as recommended, I looked at the documentation for any guidance and I found this: Ensure that readahead settings for the block devices that store the database files are appropriate. For random…
pedrommuller
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MongoDB and ZFS bad performance: disk always busy with reads while doing only writes

I have huge performance issues using MongoDB (i believe it is mmapped DB) with ZFSonlinux. Our Mongodb is almost only writes. On replicas without ZFS, disk is completely busy for ~5s spikes, when app writes into DB every 30s, and no disk activity in…
Alex F
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Should I disable turn off MongoDB profiler in production machine?

The default according to [1] is collect profile data when execution time > 100ms But one of the issue is when majority of queries' execution time > 100ms, our system start to overload and I am not sure if the profiler make our system even more…
Ryan
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Multiple MongoDB instances on same server

We set up a MongoDB development server on CentOS 6.3 and were able to separate different projects by using separate config files and rc scripts. Now we're looking at setting up a MongoDB production environment. I've read that it is not recommended…
Banjer
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mongod fork vs nohup

I'm currently writing process management software. One package we use is mongo. Is there any difference between launching mongo with mongod --fork --logpath=/my/path/mongo.log --logappend and nohup mongod >> /my/path/mongo.log 2>&1 < /dev/null…
Daniel Kitachewsky
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Should I install MongoDB using Ubuntu's repository or MongoDB's private repository?

I was reading the MongoDB install instructions and noticed they have a private repository that the instructions tell you to add. I'm wondering if this is really needed because MongoDB is also in the Ubuntu repository (Ubuntu 12.04). I was thinking…
Sean Bannister
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MongoDB virtual memory usage

I'm testing MongoDB for archives data. We have a collection with 160M rows. MongoDB instance takes 76.2 Gb virtual memory on a 12 Gb physical memory box ;-) The swap in null. I read that virtual memory = physical + swap. What's wrong in my case ? It…
hotips
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Upgrading a mongo cluster

I am looking at adopting a Mongo cluster and am doing research. We hope to have a cluster that can scale from 10k updates per second to 100k updates per second with very write heavy traffic. The primary question is, If we wanted to move to a newer…
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Sharding MongoDB internationally with data stored based on location

We're looking to set up data centers globally and switch to a NoSQL database like MongoDB to support having our data distributed over these data centers (and as a pleasant side effect, introduce more redundancy, failover etc). However, the reason…
tzar
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How to auto-start MongoDB on CentOS reboot?

How do I setup MongoDB so that it will start back up automatically after a server reboot? This is on CentOS 5.5. I start it with the following command, but if the server reboots, I have to login to SSH and run that again to get it going (not that…
James Simpson
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MongoDB Socket Exceptions when moving chunks

I have 2 shards in my mongodb db cluster, with 1 mongos server. I have a total of 8 servers, with one replica set having 5 and the other 3. I have a single collection that is sharded across the cluster, but recently when I attempt a chunk move I…
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Unable to start MongoDB on Ubuntu 10.10

I've just installed MongoDB on a fresh Ubuntu 10.10 installation, but I'm having trouble getting it to start (at all). I'm using the latest mongo-stable package via. http://www.mongodb.org/display/DOCS/Ubuntu+and+Debian+packages. I would expect it…
Tim Fountain
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