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Questions tagged [wiredtiger]

A key/value database engine which is also part of mongo 3.0

wiredtiger logo

WiredTiger provides an ordered mapping from string keys to string values, columns support, transactions, async and bulk operations, custom collators, extractors and data sources.

See WiredTiger website

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WiredTiger error (22):'table:sizeStorer' cannot be used until all column groups are created: Invalid argument

when i install mognodb on ubuntu 16.04(arm),following error happen anybody help? MongoDB shell version v3.4.20 connecting to: mongodb://127.0.0.1:27017 2020-12-22T06:46:55.227+0000 W NETWORK [thread1] Failed to connect to 127.0.0.1:27017,…
magiceses
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mongodb consuming a lot of memory to the point that there is a need to restart nodes

Already checked many questions regarding this topic, and I believe it's a miss configuration on wiredTiger, actually not using it at all I believe. This is the memory details on the primary: ------------------------------------------------ MALLOC: …
TiagoM
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MongoDb/GridFs (C# driver) : WiredTiger caching problem/questions

I've been doing tests with GridFs (C# driver) recently and came across a problem where after uploading some ~100k files weighting aprox 1.5mb each (some are 50mb+ and some are ~200kb) : Mongodb server's memory consumption rised up to ~6.5Gb with…
MCabrolier
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Moving existing MongoDb deployment to directoryperdb by moving files instead of dump/restore

I'm currently trying to move my existing MongoDb deployment to the --directoryperdb option to make use of different, mounted volumes. In the docs this is achieved via mongodump and restore, however on a large database with over 50GB compressed data…
nn3112337
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How to configure Mongodb cache size per database?

I have two Mongo databases (A and B). Database A is in a place where speed is very important, while B is used in places where speed is not much of an issue. I would like to somehow limit the size of the available cache for database B, so database A…
4evertoblerone
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MongoDB queries spending lots of time on Global.timeAcquiringMicros.r

I am using MongoDB version 3.0.14 (with wiredtiger) as 4 member repliate set. I am facing a strange issue in production where suddenly most of the queries start to block on Global.timeAcquiringMicros.r (on Secondary Mongod Server, where the…
Abhishek Kumar
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Will Increasing the system memory, reduce dirty Cache % in Mongo wired tiger

I am having a Mongodb replica set with one primary, one secondary and one arbiter. The hardware specification of both primary and secondary is same, i.e. 8 core, 32 GB RAM and 700 GB SSD. I have recently moved the database to the WiredTiger db…
Bidyut
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How to extend journal file size of mongodb?

Is there any way to extend journal file size limit of wiredtiger engine inside of MongoDB? I found several ways to adjust the journal file size, but they introduced the way to vary the size smaller, not larger. (How to control size of journals in…
doon12
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How writes happen in MongoDB?

MongoDB uses WiredTiger storage engine for processing writes and it also uses 50% of available cache. So I want to understand how wiredTiger uses the cache for writing data. And why by default it requires 50% of cache? If the cache size is decreased…
Sam
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Mongod process not starting

Mongod process shutting down while starting with following error exception in initAndListen: Location40414: BSON field 'MinValidDocument.t' is missing but a required field, terminating
Lucifar
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Mongo DB Out Of Memory Crashes

I'm running a MongoDB 3.4 instance with WiredTiger that 64 GB of RAM. Recently, I've been encountering frequent of out of memory conditions, which require a database restart. Below is what an increase in virtual memory looks like from mongostat.…
user1507889
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How can I map collection name to WiredTiger URL without db.collection.stats()

We have some weird problem where we can't run db.collection.stats(). So I am looking for other way like querying form some collection in mongo to map it some how ? I am not able to find any collection in shard databases to show that information. If…
Uday Bhaskar
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Unable to start mongod with one missing collection wt file

I have a working mongod instance (v3.2.21). But suddenly it stopped working. When i run mongo command it is throwing me following error: 2019-06-04T13:52:41.725+0000 W NETWORK [thread1] Failed to connect to 127.0.0.1:27017, in(checking socket for…
Pankaj Khurana
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What is the exact limit on the number of collections in a MongoDB database based on the WiredTiger(MongoDB 4.0) engine as of today(May 2019)?

I'm trying to put a forum-like structure in a MongoDB 4.0 database, which consists of multiple threads under a same "topic", each thread consists of a bunch of posts. So usually there are no limits on the numbers of the threads and posts. And I want…
David Bryan
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How can I keep my parallel application across multiple servers from grabbing the same mongodb document for work?

So the question is long but pretty self explanatory. I have an app that runs on multiple servers that uses parallel looping to handle objects coming out of a MongoDB Collection. Since MongoDB forces me to allow multi read access I cannot stop…
user4761570
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