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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Hierarchical data in MongoDB?

I have a question regarding Hierarchical data. Our app shows posts, that are structured inside parents. Here's how it goes: prof->sprof->subject->post (Each prof can contain multiple ...
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32 views

Mongodb replication behind a gateway

I have a replicaset with 3 servers and I need to move two if them behind a gateway. The final setup would look something like this, Server 1 (PRIMARY) ________ | S | _____________ | _ _ _ _ _ _ _ ...
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Socket recv() timeout on slave node

Now I installed Mongodb 2.6.4 as master node. On another node I installed same version as slave node. I configure "only=xxx" parameter to sync xxx database. When I start up slave node.I get following ...
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1answer
50 views

MongoDB - real disk usage is LOWER than dbStats.storageFile

I'm a bit surprised by what I observe in my mongo server, so I would like to know if anybody understand how this is possible. I have one collection of around 15K documents. For each of them, I store ...
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36 views

Mongodb instances and oplog

I would like to ask a couple of things about mongodb and replica sets: I have different meteor applications running on my private server; each one of them uses a different meteor database (and does ...
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56 views

Mongo Chunk 250000 document limit is creating problem in chunk migration

We can set chunk size limit for a DB. But chunk has a limit of 250000 documents per chunk. My chunk size is 250 MB which varies the number of document in each collections. So normally some of my ...
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67 views

Why mongod said “note: noprealloc may hurt performance in many applications”?

I just start mongod with config file: mongod -f /etc/mongod.conf In /etc/mongod.conf, I set storage.preallocDataFiles=true This is a part of config: storage: dbPath: "/data/db" ...
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1answer
143 views

How to add setParameter in mongod config?

When I am using setParameter in mongod config, I start mongod with error: Unrecognized option: setParameter = enableLocalhostAuthBypass=1 How can I use setParameter from config file ? P/S: I am ...
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4 views

after “mongod --remove” in Windows and then lost the databases

I removed MongoDB from the Windows Service by "mongod --remove" in command line and succeeded. After creating a new mongodb service with the same dbpath and "mongod --repair", I couldn't get the ...
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1answer
86 views

Mongo db sharded “the collection's metadata lock is taken” issue coming very frequently

I am seeing this warning in mongoS log consistently for one collection. [conn96] warning: splitChunk failed - cmd: { splitChunk: "ibeat20150105.dgrpCount", keyPattern: { articleId: 1, host: 1 }, min: ...
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1answer
137 views

Chunk Size is shown as 1 KB in mongo db logs even it is set to 300 MB

I am running a mongo cluster. Chunk size set is 300 MB but for today morning it is showing me in logs taht chunk size is 1024 Byte. I checked in current op there also it is showing chunks of 1024 ...
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2answers
44 views

Separate login for user / administrators using mongodb

I have 2 separate groups of users on my website. One is user and the other one is admin. Currently I put them in 2 different collections user and admin and login respectively. My questions is: ...
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60 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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1answer
43 views

MongoDB replica index filled hard drive stuck in fatal

I have a 3 server replica set deployed by Googles 1 Click Deploy functionality, the problem is I created an index on a particularly large collection (100,000,000 documents) and it consumed the whole ...
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0answers
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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2answers
50 views

Help - Error : Could not connect to master of shard replica set

I have a shard, using mongo v2.4.11. It has to mongos, 3 config, and 8 replica set (2 replica for each set, means 16 node for shard) It is keep having exception as per below. Caused by: ...
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1answer
33 views

How to use fsyncLock() safely in backing up a single mongod

I read from mongodb document: important: db.fsyncLock() may block reads, including those necessary to verify authentication warning: When calling db.fsyncLock(), ensure that the connection is kept ...
2
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1answer
92 views

mongoexport not exporting all possible data

I have a collection with documents similar to the following: { _id: 'p_123456', id: 123456, kind: 'person' data: [...] } id field can contain either positive or negative integers. This ...
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41 views

An efficient way to do “reverse queries” in MongoDB for an expert system?

I am working on an "expert system" in which I would like to perform "reverse queries", that is I want to store queries and find queries that match a given object. For example, if I have an object ...
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1answer
140 views

I can not copy database MongoDB

I created a mongo cluster in ubuntu and run the copy in the sharding with a small database, everything works fine. The problem is that when I try to copy a database 300gb, is not getting done. The ...
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1answer
30 views

Mongodb: Possible to enlarge a capped collection?

If a collection is created as capped, is it possible to increase the cap without losing data? Or to increase the cap without recreating the whole collection? Thanks
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1answer
24 views

Mongodb: Does the stats command show me the capped size setting?

I am looking around my mongo instance. One of the collections was created as capped: db.createCollection("userObjects", { capped:true, size:400000000000 }) But when I look at the ...
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1answer
36 views

MongoDB Sharding : What should be the Sharding key if we want to find records with more than one field

I am having collection ("links") with listed fields: collection-name: "links" 1) url 2) title 3) score 4) description 5) ratings (embedded_many) and having index on "url", "title", "score" because ...
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2answers
47 views

Mongodb: Does not seem to respect capped size limit

Running mongodb on win2012 Mongo db version v2.6.4 Our collection is created with this param: capped:true, size:500000000000 // 500 gb But the data dir, that only holds this one collection, has ...
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1answer
38 views

I cannot do anything on replSet when auth is enabled

I have a mongodb cluster with one replSet, 3 config servers, and 2 mongos instances. I logged into mongos using (admin, pwd). admin is given ["userAdminAnyDatabase", "dbAdminAnyDatabase", ...
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26 views

can we avoid the database disk size increases as a multiple of the CSV file in mongoimport?

I am using mongodb-linux-x86_64-2.6.6 and importing data from csv files of size more than 1GB (and have 15 files) using mongoimport. After importing near 20GB data it goes out of space on my system ...
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0answers
49 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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0answers
22 views

can we avoid the database disk size increases as a multiple of the CSV file in mongoimport?

I am importing data from csv files of size more than 1GB (and have 15 files) using mongoimport. After importing near 20GB data it goes out of space on my system which has 250GB hard disk. I go through ...
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1answer
30 views

How to know what server and port to select in MongoVue

I am unsure about which server and port to select when trying to start up MongoVue. FYI, MongoVue is the windows GUI for using mongodb (for those macusers who may want to answer this question). I have ...
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48 views

Can i run both Redis and MongoDB l on same VPS?

My website about learning new vocabulary, and the operations which most use on website is load a new vocabulary in database, then write some parameter to that words. So i decided my database need ...
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1answer
64 views

Limit the RAM memory usage in MongoDB

I am using MongoDB-2.6.1. The question from me is that- "Is there any way to limit the RAM memory usage??" Fr example: Out of 4 GB RAM, let MongoDB use till 3 GB (<= 3 GB). Please help me out.. ...
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1answer
56 views

Mongodump on Replica Set

Running backups on a Mongo Replica set - 1 primary, 1 secondary, 1 arbitrar. Had a instance where all three stopped talking to one another and all went to secondary. I ran a backup against the the ...
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1answer
95 views

3 Node Replica Set all became SECONDARY

my 3 set replica set all became secondary and I'm not sure why. db1 2014-12-12T02:43:55.067+0000 [conn1413096] end connection 10.0.64.12:58483 (512 connections now open) 2014-12-12T02:43:55.067+0000 ...
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1answer
68 views

MongoDB Stuck with Jumbo chunks while exhausting a shard

I'm running a shared MongoDB 2.4 cluster. I'm currently in a process of exhausting a shard and I'm down to the last 15 chunks needs to be migrated out of 9660. My issue is that these chunks are too ...
2
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1answer
51 views

Mongodb: too many namespaces raise on setProfiling

I have a mongodb database with a single (relatively big, around 130GB) collection, with 3 indexes, on which I'd like to do some profiling. However when I run the db.setProfilinStatus(1, 1000) command, ...
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1answer
70 views

Update an array element with inc mongo update

HI All I have this Data in mongo, {"articleId" : [ { "articleId" : "9514666", "articleCount" : 1 } ], "count" : NumberLong(1), ...
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0answers
47 views

aggregate array records in mongo db

HI All I have this Data in mongo, {"articleId" : [ { "articleId" : "9514666", "articleCount" : 1 } ], "count" : NumberLong(1), ...
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0answers
55 views

MongoDB mongoexport $or query returns zero records

I have the following cmd in bash termial mongoexport --db fscrap --collection Wall -q "{\$or : [{'insert_time' : {\$gte : new Date(1393624800000)} },{'comments.comment_time' : {\$gte : new ...
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1answer
71 views

Choosing shard key with compound index field

I have a compound key with field articleId_1_host_1_timeStamp_1_isIndia_1_location_1. Cardinality of fields is articleId has 20000 different value host has 17 value timestamp is increasing field ...
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0answers
66 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 ...
0
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1answer
41 views

Disable TTL thread in MongoDB

Is there any way to disable TTL deletion thread in mongoDB? I know that you can modify the ttl index expireAfterSeconds value to a high number in order to "technically" stop ttl from deleting, but i ...
0
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1answer
31 views

Copy Remote Database MongoDB

First off let me say I am a newB when it comes to Mongo, so excuse my ignorance. With that being said: Using db.copyDatabase() to copy a remote database: What impact does this have on the database ...
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1answer
19 views

MongoDB store weekly data?

I am trying to think of the best way to store my applications data in weekly chunks. The app is a basketball statistics app, after all the games are finished for example in week one I would like to ...
0
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1answer
38 views

Mongos - Query error

After we configured six replica set servers and three config servers with mongos. we are not able to see records from mongos server. Kindly have a look my below errors and please suggest to us. ...
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1answer
214 views

MongoDB - Insertion Speed

Suppose you have a collection of students of the following form: {"_id" : ObjectId("50c598f582094fb5f92efb96"), "first_name" : "John", "last_name" : "Doe", "date_of_admission" : ...
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0answers
19 views

Replication lag is causing issue on one shard

I am running a mongo db sharded cluster with two shards. Each shard has one primary, one arbiter and one secondary. On one shard I am facing an issue with replication as it is showing this result ...
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1answer
113 views

$addToset do not work in update if record not exists

I am trying to use following query db.TestColl.update({ "tags" : "silk" , "host" : "host.com"},{ "$set" : { "cat" : "MOVIE","publishTime" : 1370427540000 }, "$addToSet" : { "articleId" : { "$each" : ...
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0answers
67 views

Mongodb compound index on two fields where one field is sparse

I have a collection of documents that give stats relating to videos. I have a unique compound index on videoId, date (there is at most one document per video per day). I want to be able to; in a ...
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0answers
50 views

mongodb configuration issue

I am editing the configuration of running mongodb in an 'amazon ubuntu instance' (with more than 30 GB data), and I attached some volumes for data, log, and journal I followed mongodb-ec2: ...
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1answer
20 views

Error on mongos server

Firstly,I am new to mongodb. when we executed the below command on mongos server. /usr/bin/mongos --configdb X.X.X.1:20001,X.X.X.2:20002,X.X.X.3:20003 --port 27017 --chunkSize 1 we are getting the ...