I understand that in MongoDB a BSON document can be no bigger than 16mb. Does this size limit account for embedded documents as well? I plan on having well over 16mb of documents inside the embedding document.
A single MongoDB document cannot be larger than 16 MB and all of a document's embedded documents count toward this limit, so what you're planning won't work.
Related
Is there any limit for fields count per single MongoDB document? Didn't find anything about that in documentation.
For example, if I have document that contains 1000 fields and fits 16Mb.
Yes, It will work.
Fields are part of Documents. Mongo has only document size limit of 16Mb. As long as it fits in 16Mb, it's good.
But I suggest you to look at the need for these many fields in single document.
I haven't found any information about this.
How many documents can a single collection have in MongoDB before it is necessary to use sharding?
There is no limitation as you can see here:
If you specify a maximum number of documents for a capped collection using the max parameter to create, the limit must be less than 2^32 documents. If you do not specify a maximum number of documents when creating a capped collection, there is no limit on the number of documents.
#M-A.Fernandes has right.
I can only add this information:
Maximum Number of Documents Per Chunk to Migrate
MongoDB cannot move a chunk if the number of documents in the chunk exceeds either 250000 documents or 1.3 times the result of dividing the configured chunk size by the average document size. db.collection.stats() includes the avgObjSize field, which represents the average document size in the collection.
From docs: https://docs.mongodb.org/manual/reference/limits/
the maximum BSON document size is 16 megabytes.
I wonder how mongo checks this limit.
If I use WiredTiger and snappy compression, does it mean that I can put more data inside document until it reached 16Mb. Or Mongo calculates size of document in uncompressed state?
MongoDB enforces the 16MB limit even before passing the document to the storage engine, so no, you cannot use the compression to squeeze more data into the document.
Reference.
According to MongoDB documentation
The maximum document size helps ensure that a single document cannot
use excessive amount of RAM or, during transmission, excessive amount
of bandwidth. To store documents larger than the maximum size, MongoDB
provides the GridFS API.
Can anyone tell me what is the default mongodb database maxsize.
I have installed mongodb on my windows server, and created a document(db).
Document created and it is showing the size - 65,536KB. Is this max size that I
can write the data or can I extend it.
Mongodb's manual shows as below:
http://docs.mongodb.org/manual/reference/limits/
MongoDB Limits and Thresholds
This document provides a collection of hard and soft limitations of the MongoDB system.
BSON Documents
BSON Document Size
The maximum BSON document size is 16 megabytes.
The maximum document size helps ensure that a single document cannot use excessive amount of RAM or, during transmission, excessive amount of bandwidth. To store documents larger than the maximum size, MongoDB provides the GridFS API. See mongofiles and the documentation for your driver for more information about GridFS.
This is about a recommendation on mongodb. I have a collection that always increase row by row (I mean the count of documents). It is about 5 billion now. When I make a request on this collection I sometimes get the error about 16 MB size.
The first thing that I want to ask is which structure is the best way of creating collections that increasing the rows hugely. What is the best approach? What should I do for this kind of structure and the performance?
Just to clarify, the 16MB limitation is on documents, not collections. Specifically, its the maximum BSON document size, as specified in this page in the documentation.
The maximum BSON document size is 16 megabytes.
If you're running into the 16MB limit in aggregation is because you are using MongoDB version 2.4 or older. In these, the aggregate() method returned a document, which is subject to the same limitation as all other documents. Starting in 2.6, the aggregate() method returns a cursor, which is not subject to the 16MB limit. For more information, you should consult this page in the documentation. Note that each stage in the aggregation pipeline is still limited to 100MB of RAM.