nosql Questions
10
Solved
We're designing an OLTP financial system. it should be able to support 10.000 transactions per second and have reporting features.
So we have come to the idea of using:
a NoSQL DB as our m...
8
Solved
I need a very basic key-value store for java. I started with a HashMap but it seems that HashMap is somewhat space inefficient (I'm storing ~20 million records, and seems to require ~6GB RAM).
Th...
11
Solved
I'm trying to retrieve my documents with id but can't figure it out.
Currently I retrieve my documents like this :
const racesCollection: AngularFirestoreCollection<Races> = this.afs.collec...
Trowel asked 24/10, 2017 at 0:29
3
All,
I need to store a large amount of files(few millions) in a database and I'm not sure which technology or database use.
My first idea is use mongodb or no sql dB.
Thanks
4
I have a micronaut app that starts up with a Scylla database and I want initialize a keyspace and a columnfamily so that people can run the app locally and have it ready to use.
For my initial appr...
8
Solved
I have read the following text in a technical blog discussing the advantages and disadvantages of NoSQL:
"For years, in order to improve performance on database servers, database administrato...
Kenti asked 4/1, 2012 at 15:56
3
Solved
My question is pretty simple, was looking for a simpler answer, Why is C in CAP theorem not same as C in ACID?
Read this HN thread.
Update
A Hitchhiker's Guide to NOSQL v1.0, slide 71 says: C in...
Kaveri asked 27/1, 2011 at 6:11
4
I am working on a Django application, which uses Django 1.8 version.
Most of the data we deal with is JSON data. We are trying to use a NoSQL database. But I see that MongoDB is not compatible with...
9
Solved
I have a document in MongoDB and I would like to get the ObjectId of this document, but I did not find so far a method that does this to me.
Example of query :
user= db.users.find({userName:"An...
7
Solved
Let's say I have a collection of documents such as:
{ "_id" : 0 , "owner":0 "name":"Doc1"},{ "_id" : 1 , "owner":1, "name":"Doc1"}, etc
And, on the other hand the owners are represented as a se...
8
Solved
How can I add a new field to every document in an existent collection?
I know how to update an existing document's field but not how to add a new field to every document in a collection. How can I...
7
Solved
I've been playing with redis (and add some fun with it) during the last fews days and I'd like to know if there is a way to empty the db (remove the sets, the existing key....) easily.
During my te...
2
Solved
In my mongo database I have field timestamp which holds time of creation in timestamp ie: "timestamp": 1544029233021
I want to create TTL index on this field, but in docs example is done on "create...
Manet asked 13/12, 2018 at 17:2
14
Solved
While I try to understand the "Availability" (A) and "Partition tolerance" (P) in CAP, I found it difficult to understand the explanations from various articles.
I get a feeling that A and P can ...
Emie asked 10/9, 2012 at 6:25
8
Solved
with MongoDB (and I assume other NoSQL database APIs worth their salt) the ways of querying the database are much more simplistic than SQL. There is no tedious SQL queries to generate and such. For...
Breda asked 22/4, 2010 at 19:59
14
Solved
I try to deploy my Mongo database in Mongolabs, everything works fine, and I create a new database. Please see my connectionstring.
public DbHelper()
{
MongoClientSettings settings = new Mongo...
Ebon asked 9/7, 2015 at 10:1
8
Solved
Is it possible to do SQL inner joins kind of stuff in MongoDB?
I know there is the $lookup attribute in an aggregation pipeline and it is equivalent to outer joins in SQL, but I want to do somethin...
6
Solved
In SQL:
Delete From Person Where ID = 1;
In Cypher, what's the script to delete a node by ID?
(Edited: ID = Neo4j's internal Node ID)
Ashkhabad asked 26/1, 2015 at 4:19
8
Solved
in this post Stack Overflow Architecture i read about something called nosql, i didn't understand what it means, and i tried to search on google but seams that i can't get exactly whats it.
Can an...
3
Solved
I have a Firebase database. I have Companies and Contractors. A Contractor can work for more than one Company and a Company can have multiple Contractors. This is a straightforward many to many rel...
J asked 7/1, 2017 at 22:1
3
Flyway can be configured to execute migrations on a NoSQL database (i.e. via Java API) or it is designed only for relational databases?
2
Solved
I'm modelling a MongoDB database in MongoEngine for a web project. I want to store the data in a slightly unusual way to be able to efficiently query it later.
Our data in MongoDB looks something ...
Antrum asked 18/11, 2014 at 10:21
7
Solved
I want to make a list of existing products in redis but I want to check if the product name already exists first (duplicate checking).
My list currently accepts duplicates, so: Can anyone help me ...
4
Solved
Is it possible to use EF Core 6 in combination with a MongoDb? From what I'v gathered online, I could only find answers from a few years ago that say that it's still not possible, but nothing...
Nonresident asked 7/1, 2022 at 8:14
3
Solved
I am attempting to delete all the documents returned by an aggregation in Mongodb.
The query I have is as follows:
db.getCollection("Collection")
.aggregate([
{
$match: { status: { $in: ["inse...
Bolan asked 6/11, 2019 at 12:7
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