Questions tagged [mongodb-3.6]
The mongodb-3.6 tag has no usage guidance.
96
questions
0
votes
0answers
37 views
Why mongodb's storage size is larger on secondary than on primary?
I don't understand why the storage size is significantly larger on the secondary than on the primary (450 GB vs 375 GB).
hardware, operating system, file system and mongodb configurations are ...
0
votes
1answer
70 views
How to warm a MongoDB index
We're running a huge MongoDB with a large index (made of of four fields) which was created ad-hoc and should now be superseded by slimmer one (of the first two fields). But the problem is we can't ...
1
vote
1answer
92 views
Shell Script to kill slow running Mongo Queries
I need to create a shell script that finds and kills long running mongo queries more than a specified threshold e.g. 15sec I plan to use db.currentOp(); and db.killOp(); to find and kill queries but I ...
1
vote
0answers
152 views
How to simulate slow queries on MongoDB
I need to write a shell script that finds and kills long running mongodb queries, but I don't have access to the database that runs slow queries, how to I simulate running slow queries on my local ...
0
votes
1answer
253 views
MongoDB Aggregate Poor Index Usage
I've been trying to understand the MongoDB Aggregate process so I can better optimize my queries and I'm confused by usage and $match and $sort together.
Sample DB has only one collection people
[{
...
0
votes
0answers
11 views
Append object to document node.js/mongodb
Say I have a mongodb document I'm trying to update. The schema is level1 (object)> level2 (object) > "objects".
If I want to add another object to the end, what is the method to do ...
0
votes
0answers
24 views
Appropriate language to write a Script that Kills Long running query MongoDB
I want to create a script that kills queries when they reach specific time threshold, I will be using db.currentOp() method to get information about currently running queries, and use db.killOp to ...
0
votes
0answers
94 views
MongoDB 3.6.21 crash and not reIndex
I try to reIndex() my collection but not working and It removed all indexes. I checked mongod.log and see:
2021-01-18T05:56:59.492-0600 E STORAGE [conn1] WiredTiger error (5) [1610971019:492802][...
0
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0answers
42 views
MongoDB numerous slow query logs with zero keysExamined
using a MongoDB version 3.6 Replica Set, I am wondering why a query that resulted in no key examination and document examination would result in being slow. For example, I have numerous slow query ...
0
votes
0answers
23 views
MongoDB 3.6 fresh install
I'm using mongodb 3.6.18
I'm running a cluster of 2 shards and 1 config replicaset.
I get this error when trying to set the compatibility version to 3.6:
global:PRIMARY> db.adminCommand( { ...
3
votes
0answers
832 views
MongoDump Failed: error writing data for collection `collection` to disk: error reading collection: EOF
[BACKUP COMMAND] mongodump --host 127.0.0.1 -d database --port 27017 --username username --password password --out /output/path/mongodump_DATE_12_00_AM
[ISSUE] Failed: error writing data for ...
0
votes
1answer
1k views
Cannot restart or repair mongodb database after the crash (***aborting after invariant() failure) [closed]
After an unexpected crash, I can't restart or --repair the mongodb database anymore.
While restarting the server with systemctl restart mongodb I am getting the following:
2020-09-16T20:25:23.835+...
-1
votes
1answer
143 views
Migrate data from an older version of mongodb
How can I backup and restore a large mongodb database (500GB) from a server running an older version (v2.6) than the target one (v3.6)?. The downtime is critical.
We've tried by making a straight copy ...
0
votes
1answer
1k views
how to run db.adminCommand() using pymongo for mongodb 3.6
I want to run this command and get it's output using pymongo module.
db.adminCommand({getParameter: 1, logLevel: 1})
or say I want to run this command
db.adminCommand( { setParameter: 1, ...
0
votes
0answers
38 views
Migrate MongoDB 2.4.14 to MongoDB 3.6 [duplicate]
I have a database with MongoDB 2.4.14 and I want to migrate the database to MongoDB 3.6.
Note: the file is original from the db path. Not from mongodump.
This process is messy as it requires doing ...
1
vote
1answer
455 views
Restoring from MongoDB Atlas (4.2.5) to DocumentDB (3.6) do no succeed due to error "Unsupported BSON : type Decimal128"
MongoDB Atlas (4.2.5) to DocumentDB (3.6)
Below is the command I used for mongodump on my MongoDB shell. I had received a warning, but it was successfully completed.
C:\MongoDB\bin>mongodump --...
0
votes
1answer
48 views
Chunk size bigger than configured
We have a sharded mongo cluster. We have configured the chunk size to be 256M but they are ~1.5G each. There are no jumbo chunks as our shard key is well balanced (we have also checked for them ...
0
votes
1answer
462 views
How to use mongoexport command with ssl?
I am trying to export collection data from (SSL MongoDB 4.x), for this I am running below command on linux terminal.
Earlier I used mongoexport command in Linux terminal without SSL which works ...
0
votes
1answer
761 views
Mongo E11000 duplicate key error collection after mongo 3.4 to 3.6 upgrade
I have a Mongo replica set on Ubuntu with three members configured for my information system and am having issues when I try to upgrade MongoDB from version 3.4 to 3.6
After setting the "...
0
votes
1answer
220 views
Can't migrate standalone MongoDB to Cluster
I'm trying to convert a standalone MongoDB database into a cluster in order to migrate my database to MongoDB Atlas.
I've followed the following steps to try and convert it:
Stop my mongodb instance
...
0
votes
1answer
267 views
We use MongoDB 3.6 community version, How can i get the number of hits on single collection as well as bandwith usage?
Is it possible to get the number of hits on single collection as well as bandwith usage in mongodb ?
1
vote
0answers
270 views
Why did mongoDB reads from disk into cache suddenly increase?
This is a mongoDB replica set with 1 primary, 1 secondary and 1 arbiter.
Suddenly the reads from disk into cache and cache page evictions increased 2x-3x and stay elevated since then (all metrics ...
1
vote
0answers
2k views
MongoDB replica set Network Interface exceeded time limit
I am using MongoDB version 3.6.12 and saw one of running secondary node keeps getting this error from log:
2019-09-23T12:24:48.921-0400 I REPL [replication-791] Restarting oplog query due to ...
0
votes
2answers
2k views
MongoDB Replica Set InitialSyncOplogSourceMissing error
I am setting up a 3 nodes MongoDB replica set with one node in AWS using Mongo 3.6.12. There are about 400GB data need to sync to secondary nodes. Initial sync starts fine. However, after data sync ...
2
votes
1answer
5k views
Converting MongoDB instance from Standalone to Replica Set and Backing Up
I want to convert my MongoDB 3.6 standalone server to a replica set so I can watch a collection using change streams, which requires an oplog. I only want to use change streams so will keep this as a ...
0
votes
1answer
2k views
mongodb - Replica set creation error: Quorum check failed because not enough voting nodes responded
I am configuring a mongodb replica set. From my current primary node, when rs.add('host1:27017'), it yields this error
Quorum check failed because not enough voting nodes responded; required 2 but ...
0
votes
0answers
445 views
How to delete a user in MongoDB 3.6
I was in trouble with deleting the users in mongodb3.6.
I created a user with:
db.createUser({ user: "username" , pwd: "password", roles: ["root"]})
And I deleted it with:
db.dropUser("username")
...
0
votes
1answer
265 views
Slow performance of query with $and & $or operators
My query with $and, $or operators is performing poorly. Even though I've built a compound index on all three fields that are specified in my query criteria, the query does a complete collection scan. ...
0
votes
1answer
38 views
Why a query is not covered when using a range operator on documents?
I have created the following 1000 documents:
for(i=0;i<1000;i++){db.doc.insert({"doc":{"k1":"v_"+i,"k2":i},"scal":i})}
So a document looks like this:
var d1 = db.doc.findOne()
{
"_id" : ...
0
votes
1answer
103 views
Mongo Memory management
I had a few questions
If there is sufficient RAM, does Mongo load entire collection into memory?
Suppose I had two collections A & B and I know that there is not enough RAM to hold both - and if ...
0
votes
1answer
837 views
Is it possible to retrieve a history of the remote connections to the MongoDB including the IP addresses and the executed commands?
For some reasons I disabled the user access control and somehow all collections have been wiped out. So I want an activity log to find out how this happened
I need a list like this:
| Date/Time ...
3
votes
1answer
6k views
Why $group is very slow in aggregation and how can faster it in MongoDB [closed]
My query is taking ~3 seconds to execute with the $group stage, How can I faster this?
My query is:
db.getCollection('employee_data').aggregate([
{ $match: //Filter
},
{
$group:
{
...
1
vote
1answer
205 views
Import indexes from MongoDB v2.4 to MonDB v3.6.4
I have migrated the collection.bson file from MongoDB 2.4 to MongoDB 3.6.4 as collection.json.
But their is 1 more file collection.metadata.json in MongoDB 2.4.
How can I import this to MongoDB 3....
0
votes
2answers
3k views
MongoDB CSV Export: One Array/Column & Array Index on rows, or vice versa
I have a MongoDB schema that looks like this:
const batchSchema = mongoose.Schema({
_id: mongoose.Schema.Types.ObjectId,
time: {type: [Number]},
tmp: {type: [Number]},
hum: {type: [Number]},
...
0
votes
1answer
1k views
MongoDB, Getting Started and Connecting with Compass
I'm trying to connect to my mongoDB running as a service on my rPi3B+, using openSuse Tumbleweed 64bit, mongo version 3.6.2, from my laptop sharing the same LAN/Wifi (pi on LAN & laptop on Wifi).
...
0
votes
2answers
588 views
I am trying to achieve a Disaster recovery for Mongo DB
Right now i have a MongoDb HA in site one and i need another site with asynchronous replication enables in another location.This is a base plan of mine to achieve a disaster recovery .
I dont have ...
0
votes
1answer
3k views
MongoDB 3.6 crashed due to invariant() failure
MongoDB crashed twice in 6 hours today due to invariant() failure. We have been using MongoDB 3.6.3 for more than a year now, but this is the first time that we saw this issue. The extract from the ...
2
votes
2answers
4k views
MongoDB does not allow to create unique partial index in field that contains null
I'm using MongoDB 3.6.9 (with Ubuntu) to save a set of documents that contain one field named rss_id and for some documents, this field has the value null. I want to create a unique index in that ...
1
vote
1answer
259 views
No output when use pymongo watch()
I try to access real-time data changes with pymongo.mongo_client.MongoClient.watch(), code example (Python 3.5.3, pymongo==3.7.2):
from pymongo import MongoClient
DB_CON_STR = "mongodb://10.10.10....
0
votes
1answer
873 views
Why am I seeing these mongodb 3.6.5 server log messages in huge amounts?
Could someone please shed some light on these mongodb 3.6.5 server log messages on the primary node of a 3-member replicaset? rs.status() says all the nodes are up and running but seeing a ton of (I)...
0
votes
1answer
52 views
mongodb array query woes
I am struggling with array matching and getting multiple records back.
"players" : [
{
"pname" : "player_4",
"loc" : [ -2.2, 1, 0]
},
{
"pname" : "player_2",
...
1
vote
2answers
477 views
Is it possible to run an arbiter on a machine that also hosts a secondary member?
I have two machines (it is a restriction) configured as a replica set with MongoDB 3.6.5.
Is it possible to run an arbiter on a machine that also hosts a secondary member?
Even if it is not ...
0
votes
1answer
287 views
Replica Set Oplog Maxsize
I have two databases (Mongodb 3.6.5) using ReplicaSet, when I made a split in the network, I am forcing the secondary database to be the primary.
cfg = rs.conf()
cfg.members[0].votes = 0
cfg.members[...
0
votes
1answer
159 views
How to solve replication in MongoDB only with two machines?
I have two machines connected in a ring network, each one running Wildfly in HA mode using JGroups ant MongoDB in HA Mode using Replica Set. The machine 1 is the primary and machine 2 is secondary.
...
0
votes
1answer
4k views
mongodb - what roles the user to grant access to all databases
I have created mongouser as testuser with below roles. I want to give access for new databases for this user. what roles the user to grant access to all databases.
db.createUser({ user: "testuser" , ...
1
vote
0answers
47 views
Changing collection path and index path in mongod.conf file
I want to have collection path and index path in different folders of my mongodb.
What are the required changes? My current configuration file is this:
storage:
dbPath: /db/mongodb
journal:
...
3
votes
1answer
6k views
Not authorized on admin to execute command mongoDB: Atlas M0 Free Tier cluster
My MongoDB shell has version v3.6.5 (the same with older versions) & MongoDB server has version: 3.6.8
I have MongoDB M0 Free Tier cluster and I want to use from shell different commands.
So, I ...
1
vote
0answers
259 views
timeout while dropping database - MongoDB
Getting time out issue while dropping database from mongoDB. Database size is around 200GB.
{
"code" : 46,
"ok" : 0,
"errmsg" : "timed out waiting for DBNAME....
2
votes
0answers
540 views
getIndexes returns empty array on MongoDB collection
I'm trying creating indexes on a MongoDB collection and while they are correctly created and they work (I can see the index in the executionStats), the output of the getIndexes() function is an empty ...
0
votes
1answer
723 views
Query sharded collection returns all the results from the primary shard AND from the other shards
I tried to set up a shard to test this functionality and maybe migrate some of our data into it.
I followed the documentation guide https://docs.mongodb.com/v3.4/tutorial/convert-replica-set-to-...
