mongodb-user@googlegroups.com discussions for September 2013

17	[mongodb-user] Clarity on locking with drop database

Hi, We are using mongodb version mongo_2.0.3-rc0 with jornaling enabled (No replica set). We configured mongodb in sharded mode. 1 mongos, 10 mongod and 3 mongoc. We created database on date basis ...

Birdy
Sep 26, 2013 at 1:28 pm
Oct 15, 2013 at 4:43 pm

14	[mongodb-user] Query oplog.rs is slow

Hi, db.oplog.rs.count() shows 18878152 records An external java app query periodically oplog.rs with the following code snippet: private DBCursor oplogCursor(final BSONTimestamp timestampOverride) { ...

Richardwilly98
Sep 28, 2013 at 12:33 pm
Dec 5, 2013 at 5:06 am

12	[mongodb-user] Web-based UI for MongoDB administration

We're desperately looking for a user interface for MongoDB, mostly to allow our developers and support staff to debug issues in our application. Something like PHPMyAdmin, only for MongoDB, would be ...

Davidgubler
Sep 5, 2013 at 9:30 am
Sep 10, 2013 at 7:33 am

12	[mongodb-user] Confusion about hashed shard keys

I seem have a little bit of confusion about exactly how a hashed index works. This is my status(): mongos sh.status() --- Sharding Status --- sharding version: { "_id" : 1, "version" : 3, ...

Sam Millman
Sep 4, 2013 at 10:55 am
Sep 7, 2013 at 12:07 am

11	[mongodb-user] Hullabaloo over SQL and MongoDB...

First, it is not my purpose to insult or defame anyone over this much bantied about topic. Over my life, I've learned to speak or read and write several human languages. Whenever I learned a new one, ...

Russell Bateman
Sep 14, 2013 at 5:36 pm
Sep 16, 2013 at 7:13 pm

10	[mongodb-user] mongodb init script failed to start on debian wheezy

Hello, I have just got a brand new server with a fresh debian wheezy installation. I have installed the .deb provided by 10gen but the init script failed. I don't know why but it seams that it's a ...

Antoine H
Sep 4, 2013 at 2:14 pm
Oct 10, 2013 at 9:57 pm

10	[mongodb-user] why hashed shard key can not be uniquely indexed?

keys in different shards are guaranteed to be different. is it because hash collisions, which may cause false duplicated-key alarm when insert? -- -- You received this message because you are ...

Zach yu
Sep 10, 2013 at 10:02 am
Sep 18, 2013 at 2:12 pm

10	[mongodb-user] Connection being refused and not sure what to do about it

Connection being refused and not sure what to do about it. Here is my code in the constructor pf a class called MongoDB_Manager: (What am I doing wrong or omitting?!) public class MongoDB_Manager { ...

Code Writer
Sep 13, 2013 at 4:18 am
Sep 14, 2013 at 2:50 am

9	[mongodb-user] Update vs Save - performance

Hello I'm building app based on PHP and MongoDB. The app have massive update of documents, and must be one at a time, because of processing of data for each line separately. Which method has better ...

Ofer Cohen
Sep 18, 2013 at 12:53 pm
Sep 23, 2013 at 2:03 am

9	[mongodb-user] Failover without losing Tx

Assuming I have a 5-nodes Replica Set (3 in DC1 and 2 in DC2) with journal turned on.I wonder, short of entire Data Center failure, if by setting all client write concerns to 2 will guarantee that no ...

Dhsieh
Sep 12, 2013 at 2:46 pm
Sep 13, 2013 at 7:21 am

9	[mongodb-user] Query scan too much data

Hi, I don't understand why a query scanned too much data, despite the use of an index. Thanks for your help, Here is the index : { "v" : 1, "key" : { "date" : 1, "infos.sourceValue" : 1 }, "ns" ...

Yamo93
Sep 4, 2013 at 10:04 am
Sep 10, 2013 at 8:26 am

7	[mongodb-user] Inconsistent MongoDb replication, when _id is greater than 800 bytes?

Hi all, It is clear from the documentation that maximum size of an indexable field is 800 bytes. I had certain documents that had _id of size 800 bytes. So these documents were not available with the ...

Manoj Vivek
Sep 23, 2013 at 3:49 pm
Dec 2, 2013 at 4:32 am

7	[mongodb-user] Getting frequent errors in the log saying "No value for key........."

Hi Team, We are using mongo 2.4.6 version, mongo-java-driver-2.10.1.jar and spring-data-mongodb-1.2.0.RELEASE.jar Please let me know how I can overcome this error, what is the fix for this issue? ...

Avise Sudhakar Rao
Sep 27, 2013 at 8:16 am
Oct 2, 2013 at 4:31 am

7	[mongodb-user] About writebacklisten in output of the command currentOp

Hi When I run the command currentOp() on one of my mongos,the output as follow: { "opid" : "seta:98669112", "active" : true, "waitingForLock" : false, "secs_running" : 90, "op" : "query", "ns" : "", ...

Lsl_322
Sep 26, 2013 at 2:09 am
Sep 27, 2013 at 2:13 am

7	[mongodb-user] mongo and getDay()

hey all, I'm really new to mongo. I'm trying to convert an iso date to a human readable (french) date. I'm using $db- excecute($myFunction, $myIsoDate); (from Php) basically i'm doing in ...

Yvon Thoraval
Sep 20, 2013 at 11:03 am
Sep 21, 2013 at 1:12 pm

7	[mongodb-user] Add new secondary node from backup

Is it possible to create a replica set node using a backup of an existing secondary? I tried it, and when I added the node into the set it logged a message "replSet initial sync drop all databases" ...

Jamie Snell
Sep 20, 2013 at 3:34 pm
Sep 20, 2013 at 10:06 pm

7	[mongodb-user] How data modeling can I do? (multi depth comment)

*For example* *insert* db.categories.insert( { _id: 1, articleId: 1, depth:1, regDate:2011, path:"2011:1-1" } ) db.categories.insert( { _id: 2, articleId: 1, depth:1, regDate:2012, path:"2012:2-1" } ...

전성종
Sep 18, 2013 at 11:27 am
Sep 19, 2013 at 6:37 pm

7	[mongodb-user] mongostat --discover

Hello. I got mongos instanse at 27030, mongod at 27017, 27018. And after mongostat --discover --port 27030 I expect output for all servers at the same time, but It displays info only for 27030. I ...

Данила Перепечин
Sep 12, 2013 at 1:34 pm
Sep 19, 2013 at 4:55 pm

7	[mongodb-user] pymongo not updating the document nor raising any error

Hi, I am trying to update a document (a sub document in fact) with pymongo but it silently fails. My code is: try: res = db.lintio.update({ "_id": ObjectId(record["_id"])}, { "$set": \ {"a.b.c" ...

Olivier sallou
Sep 13, 2013 at 4:24 pm
Sep 16, 2013 at 12:39 pm

7	[mongodb-user] take >7G mem usage and more than 2 mins to find single entry from >10G entries collection

Any suggestion? -- -- You received this message because you are subscribed to the Google Groups "mongodb-user" group. To post to this group, send email to <span class="m_body_email_addr" ...

Nephe lai
Sep 5, 2013 at 10:45 am
Sep 6, 2013 at 7:13 am

7	[mongodb-user] guys, what is the _id_hashed index for?

I have a cluster of 3 shards, the shard key is hashed _id(my _id is a string), I found mongoDB create an _id_hashed index for me: "indexSizes" : { "_id_" : 14060169088, "_id_hashed" : 9549780576 }, ...

Zach yu
Sep 4, 2013 at 5:15 am
Sep 5, 2013 at 7:09 am

7	[mongodb-user] Mongo Operating System

Hi, Am new to Mongo, and would like to know if I can get this software installed on Windows 7 personal laptop. Also, like to know do we have any UI (User Interface) like other application to work ...

Viswanath Sai1
Sep 2, 2013 at 10:21 am
Sep 4, 2013 at 6:44 am

6	[mongodb-user] indexes and aggregation

Hi, I have an index on a and b : {"a":1, "b":1} I use the aggregation framework. If I use two matches in the pipeline, the query is slow {$match:{"a":xxx}}, {$match:{"b":xxx}} If I use only one ...

Yamo93
Sep 18, 2013 at 1:12 pm
Oct 15, 2013 at 10:39 am

6	[mongodb-user] UnicodeDecodeError with PyMongo & MongoDB

Hi, I currently have PyMongo 2.6.2, and MongoDB 2.4.3 I am aggregating by a field where it seems to contain some Asian characters. And, aggregation seems to fail due to utf-8 decode error: I am not ...

PaulKE
Sep 20, 2013 at 10:27 pm
Sep 24, 2013 at 8:32 pm

6	[mongodb-user] How does mongo driver pick best mongos?

I have a setup with 2 shards each with 2 replica sets. The nodes in the RS are split until two regions 50ms apart. If I have web servers in each region and mongos nodes in each region, is the Java ...

Nic
Sep 5, 2013 at 8:34 am
Sep 6, 2013 at 8:11 am

5	[mongodb-user] Server-Side script execution from Java API

I have added a server-side JS function, but can't figure out how to call it from the Java driver without calling eval() which I am unable to do in production because of authentication. Does the Java ...

Kstewart
Sep 30, 2013 at 11:24 pm
Oct 2, 2013 at 12:56 am

5	[mongodb-user] _id queries, secondary (covered) indexes, and bad hint

Hi All, I'm doing a find by _id and returning a field "x" in my projection. I've got an index that will cover the query+projection but the query optimizer always selects the primary _id index over my ...

John
Sep 28, 2013 at 12:55 am
Oct 1, 2013 at 9:17 pm

5	[mongodb-user] multiple mongod-s and the drawbacks

Hi all, After reading some articles on locks, i am currently thinking of using multiple mongod-s to avoid possible contentions in the future : One for the main db (user, blogs, comments, etc), ...

Albert Kam
Sep 13, 2013 at 10:33 am
Sep 14, 2013 at 7:03 pm

5	[mongodb-user] MapReduce en MongoDB - PHP

hello teachers: First of all this is a translation of google, I hope you understand what I mean ... I tell them: JSON I have the following structure (example): _id: "1213332" name: "Hector" address ...

Héctor Guzmán
Sep 13, 2013 at 8:01 am
Sep 13, 2013 at 6:45 pm

4	[mongodb-user] MongoDB does not build with Homebrew on OSX 10.9 Mavericks Beta 8

MongoDB isn't compiling anymore with Homebrew on OSX 10.9 Mavericks Beta 8. Here is the error: == Upgrading mongodb == Downloading http://downloads.mongodb.org/src/mongodb-src-r2.4.6.tar.gz Already ...

John Cole
Sep 30, 2013 at 3:42 pm
Oct 11, 2013 at 7:31 pm

4	[mongodb-user] exception: $unwind: value at end of field path must be an array

It Gives me error while unwind the sub-array for further process .. How can we ignore this error while run time of query ? -- -- You received this message because you are subscribed to the Google ...

Mukesh Ashtekar
Sep 27, 2013 at 6:08 pm
Sep 29, 2013 at 3:40 pm

4	[mongodb-user] $sort projection just like $sort update operator

Hi How do we sort an array of embedded sub-documents using projection? Aggregation works but isn't it too much processing while unwinding , sorting and then grouping compared to the alternative of ...

Chandan Singh
Sep 25, 2013 at 3:15 pm
Sep 26, 2013 at 7:25 am

4	[mongodb-user] The type initializer for 'MongoDB.Bson.ObjectId' threw an exception - C# driver - 1.8.1.20

In several customer's environments (Windows 2008 R2/2012) we're seeing the following exception when we perform operations such as InsertBatch that end up calling ...

Paul Judson
Sep 25, 2013 at 3:21 pm
Sep 25, 2013 at 6:29 pm

4	[mongodb-user] Is compacting a database a good idea if a large amount of data is removed?

We are going to remove about 80% of the records from our 2 largest collections. The records to be deleted are evenly spread through out the collections. Should we compact the database after we delete ...

Woaksie
Sep 23, 2013 at 10:01 pm
Sep 24, 2013 at 4:54 pm

4	[mongodb-user] Server closed

Hi, i'm working with an high traffic application that use nodejs and the node-mongodb-native library. My Mongodb version is 2.4.6 on a Centos 6.4. I've this error: Error: failed to connect to ...

Andrea Di Mario
Sep 11, 2013 at 4:00 pm
Sep 17, 2013 at 8:06 am

4	[mongodb-user] Querying a MongoCollection without using cursor and not injecting query

Hi, I am new to MongoDB and I am currently getting a MongoCollection from the db and then using the query.Inject to for my Where Clause.... var data = db.AsQueryable().Where(d= query.Inject()); This ...

Bbull26
Sep 13, 2013 at 4:37 pm
Sep 16, 2013 at 2:59 pm

4	[mongodb-user] difference between MMS background flush and flushes in mongostat

I monitor the mongodb flushes in mongostat, it show 0. nsert query update delete getmore command flushes mapped vsize res faults locked db idx miss % qr|qw ar|aw netIn netOut conn repl time *0 356 *0 ...

陆峰
Sep 14, 2013 at 5:04 am
Sep 16, 2013 at 9:36 am

4	[mongodb-user] How to find super set of a given string in MongoDB with Java driver ?

Assume a collection in MongoDB contains the following documents: { "_id" : ObjectId("52327f134ddb3e0a828eed55"), "path" : "/a/b/c/d" } { "_id" : ObjectId("52327f164ddb3e0a828eed56"), "path" ...

Wayne Yeh
Sep 13, 2013 at 9:15 am
Sep 13, 2013 at 3:15 pm

4	[mongodb-user] what the best option for my scenario ?

Hello, exemple of scenario * i have a collection that contain the list of items * everytime i add a new item in the collection i need to say somewhere that this item must be check later by human I ...

ArKadia ArKadia
Sep 12, 2013 at 2:26 pm
Sep 12, 2013 at 6:11 pm

4	[mongodb-user] force replicaset stepdown with PyMongo?

Is there a way to use PyMongo to force a new election in a replicaset? I guess the way to make that happen is to make the primary stepdown. The problem I'm trying to solve: Periodically all the ...

Tim Arnold
Sep 11, 2013 at 7:13 pm
Sep 11, 2013 at 8:32 pm

4	[mongodb-user] Grouping without aggregation

Can the aggregate function do grouping on a certain field without doing any of the aggregation. I just want the results put into "buckets" without having to do separate queries. Here is a simple ...

Ks
Sep 10, 2013 at 12:40 am
Sep 10, 2013 at 5:05 pm

4	[mongodb-user] Don't use hashed shard keys (unless you really have to and know what you're doing)

This is a followup to the topic "High load on "old" shards after adding a new one" from a week ago. My problem was that after adding a new node to mongodb cluster sharded using a hashed key, the ...

Jacek Radzikowski
Sep 5, 2013 at 7:40 pm
Sep 8, 2013 at 3:40 pm

4	[mongodb-user] $sort when updating subdoc array?

So, $sort works with $push but is there a way to make it work with .update() so that the array can be re-sorted if necessary? -- -- You received this message because you are subscribed to the Google ...

Paul Kon
Sep 6, 2013 at 1:49 am
Sep 7, 2013 at 11:55 pm

4	[mongodb-user] Issuing commands to MongoDB shell with or without eval...

I'm investigating using Chef to entrust commands to the MongoDB shell in certain instances. However, I cannot seem to find incantations for using a specific database using evalfrom the command line ...

Russell Bateman
Sep 5, 2013 at 10:00 pm
Sep 6, 2013 at 3:13 am

4	[mongodb-user] Mongo Sharding on EC2

Do you see any problems with running the mongos and the mongo config on the same servers. Example being Server01 would have mongos/mongoconfig, Server02 - mongos/mongoconfig, Server03 - Mongoconfig ...

Ryan Vines
Sep 5, 2013 at 6:12 pm
Sep 6, 2013 at 12:06 am

4	[mongodb-user] Document merging with simple operations?

Hello, Let's say, i have 1 document in the collection C: {"foo1":"bar1", "foo2":"bar2"} Now I've created another document: {"foo2":"bar2", "foo3":"bar3"} What is the most natural way to end up with 1 ...

Andrey Strizhevsky
Sep 4, 2013 at 5:19 am
Sep 5, 2013 at 12:08 pm

3	[mongodb-user] How to shrink oplog.rs

My local.oplog.rs collection is 16GB. Is there anyway to reclaim that wasted free space? Can I do a repair database on it? -- -- You received this message because you are subscribed to the Google ...

Justin
Sep 24, 2013 at 9:08 am
Feb 12, 2014 at 4:38 pm

3	[mongodb-user] moving mongo to AWS

Hi All, we are planning to move our infrastructure from local hosted servers to AWS. now movement of replica set machines is fine, but how to move config servers. mongo documentation says, that ...

Syed mehdi
Sep 4, 2013 at 9:36 am
Jan 3, 2014 at 3:11 pm

3	[mongodb-user] Modelling ACL feature

I am quite new to MongoDB with some background in relational databases and have recently been thinking about the best way to model access control list for a startup project I am working on. Consider ...

Sh141
Sep 6, 2013 at 9:20 pm
Nov 14, 2013 at 8:52 am

3	[mongodb-user] Database is seen in 'show db' even after dropping the database successfully.

Hi, We have following configuration of mongodb:(journal enabled) On machines-1 have following servers mongod - 5 config server - 2 mongos - 1 On machines-2 have following servers mongod - 5 config ...

Jitendra verma
Sep 25, 2013 at 2:28 pm
Oct 4, 2013 at 8:41 am

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