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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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What is the maximum database size of mongodb 3.0.3 with WiredTiger engine

What is the maximum database size of WiredTiger engine? There is only the maximum database size of MMAPv1 on MongoDB Manual as below. http://docs.mongodb.org/manual/reference/limits/
tottishi05
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How do I Increase WT allocation_size - MongoDB

On this [link] (https://source.wiredtiger.com/3.1.0/tune_page_size_and_comp.html) there is a note that allocation_size can be tuned between 512B and 128 MB How do we modify that variable and start mongod process that will have allocation_size of…
Kunal
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Is MongoDB WiredTiger using clustered index?

Is WiredTiger using clustered index on _id or just non-clustered index when it is as the storage engine of MongoDB? Is there any way to manage it?
Vincent More
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Mongodb WT_ERROR: non-specific WiredTiger error,

I've tried this command: mongod --repair --dbpath --storageEngine wiredTiger and received the same error. Mongo version v3.4.9 Here is the error when I try to start mongo pointing to the now corrupt db: E STORAGE [initandlisten] WiredTiger…
Evelyn Zouras
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WiredTiger and in-place updates

I have a collection of users. Each user has a field "geoposition" that is updated quite often (every time the user moves significantly). As I want concurrency on the document level instead of the collection level when updating, I am using the…
zeus
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MongoDB 3.2 wiredTiger performing better than MongoDB 3.4 wiredTiger

In my local I ran the iibench-mongodb benchmark with mongo 3.2 & 3,4 with wiredTiger. In my tests mongo 3.2 wiredTiger seems to be performing better than mongo 3.4 wiredTiger for both insert & query. Is this expected and why is the latest mongo…
tuk
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MongoDB v3.2.6 Sporadic Slow Queries

Could anyone provide insight on how to troubleshoot the sporadic slowness I'm experiencing w/ mongo, or point out any obvious problems based on my slow operation logs? I have Mongo v3.2.6 using the WiredTiger engine installed on an m4.large (8GB…
Tommy Adamski
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Index size is greater in wiredTiger compared to mmap

I was just evaluating MongoDB. For testing purpose i inserted 500 documents in mongoDB collection one with wiredTiger storage engine and other with mmap. While doing stats query the _id_ index size is greater in wiredTiger compared to mmap. Overall…
undefined_variable
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mongodb lost collections catalog

We are using MongoDB 3.0.4, in standalone mode, with wiredTiger, Windows Server 2008 x64. We have a situation where MongoDB lost the "catalog" of collections (I think). We use this database in a JavaEE application, inside Wildfly 8.2.0.Final. The…
siega
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mongo server issue when restart the mongo process

Mongo process started by normal user, then server has been rebooted. After rebooting the server, when tried to start the mongod with the same user getting permission denied. I checked in the log file, username got changed to root user. The error…
user3278612
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mongodb - wiredtiger memory usage growing

We moved over to wiredtiger and have seen memory usage creep up, with mongodb using 90% of the memory on the system. It seems to be slowly creaping up. Before wiredtiger when we used mmap on mongo 2.x memory would sit at 8%. I am worried about the…
henry.oswald
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Mongodb whole index scanned, very slow, using WiredTiger

I have a Device collection with the following index set up: { "v" : 1, "key" : { "sdk.id" : 1, "sdk.createdAt" : 1, "sdk.updatedAt" : 1, "deviceInfo.isTablet" : 1 }, "name" :…
Jonathan Muller
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MongoDB:: Efficient Compound index on MultiKey field with sorting

i'm trying to make a compound index on a multi-key field be performant on sorting, but i can't seem to figure it out. using mongo 3.6 with wiredtiger here. my documents look like this (removed everything that's not being queried nor is in the…
srecnig
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MongoDB - WiredTiger Snapshots vs. Locking

I am not completely understanding how these two features relate to one another in a (WiredTiger) MongoDB program: 1) WiredTiger Snapshots 2) Data Locking If each read operation using the WiredTiger engine is, at read-time, provided with a database…
TyRyDurden
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Which is normal percentage usage of internal cache for WiredTiger engine?

I use mongoDB WiredTiger v3.4.1. Current stat of cache usage in mongostat is 80%(used field). Is it normal or this value should be lower? Could you tell me where I can get normal values for all stats?
Greg Eremeev
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