Most voted "nosql" questions
Nosql is a kind of persistent data storage that uses not only SQL but other storage forms like documents, Key-Value tables (Key-Value)
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answers43
viewsNosql and MYSQL - when to use?
The question may be a little generic but I don’t know how to be more specific. When to use a nosql database and when to use an sql? 90% of banks or more have relationships. clientes se relacionam…
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answer460
viewsnodejs + Mongoose how do for one query need another?
I have two tables they have a link id being table A(Initial) tableB(dependencies) however there may be dependencies. I’d like you to just return in the dependency sequence. function Deps(dt) {…
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answer150
viewsMultiple applications consuming the same database
Today I have an application that uses a database (Mongodb), but I have few users yet and as we know it is very difficult to have an application that is successful and accumulates many users.…
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answers45
viewsMongoclient returns empty when selecting a Collection
I’m using the Mongodb Atlas with bank,and the Mongodbdriver to make the connection, but when selecting my Collection it returns empty instead of returning the collection data. My connection: class…
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answer135
viewsDB Nosql, when to use?
I work in a company that the data flow is not so great, however the amount of information that is already recorded in the bank are considerably large.... Yesterday in college we argued about the…
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answers34
viewsRedirecting data with mongodb
I was wondering if it is possible to direct an object/result to a specific collection using the command db.collection.find(), which would equal the $out in the aggregation operation.…
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answer255
viewsError while displaying information in Android + Firebase listview
I’m having two problems with this program... the first is that when registering it does not enter the first loop replay msm being td straight... it jumps and displays the message "no data"The second…
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answers39
viewsDocument structure
Hello, I’m starting to learn Mongodb, and I have a question I haven’t found anywhere: Documents from the same collection may have different structures. Example: { "id": "1", "name": "John" }, {…
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answer81
viewsDynamic columns in mongodb view
Hello, I have a job where I need to create a view a db widget, but some columns of this view should be calculated at runtime, similar to mysql NOW(), for example: When I find in the view, I need a…
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answer43
viewsIs it possible to visually display another value for a certain value in the bank?
I’m doing a Todo and I need to set priority (urgent, high, medium and low). But I am only able to define through integer (1 is urgent, 2 is high etc) The question is: is it possible to show another…
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answer154
viewsMongodb - Mmapv1 or Wiredtiger?
We started a project with mongodb, at the time testing the Wiredtiger engine. This engine proved to be more interesting due to compressing the data much more than mmapv1. However, sometimes mongodb…
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answer187
viewsWhich PHP frameworks have better support for working with Nosql databases?
I’d like to know which PHP frameworks have the best support for working with Nosql databases? The Nosql banks I already have experience with are Mongodb, Redis and Cassandra, but I am interested in…
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answer94
views$lookup no db.createView()
I have a database of two Collections: companies and people. And I want to create a view called "peopleSectors" from the collection people. db.createView ( "peopleSectors", "people", [ { $lookup: {…
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answer61
viewsElasticsearch Inner with shop
In my project there are about 40,000 products from different stores, but to return a search for Elasticsearch,I need the city and state filter where the store is located. The problem is this, if a…
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answers551
viewsWhat is capped Collection?
Hello, I would like to know what is Limited Collection (Capped Collection) and for what we use in Mongodb.
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answer24
viewsWhat is a Distributed Cluster?
I am studying about database, specifically the mongoDB. So in the face of my ignorance, I would like to know what that expression, cluster distribuído or consulta em cluster distribuído, means.…
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answers652
viewsConvert SQL query to Mongodb
I have little (or no) knowledge in non-relational banks. I need to convert the below query (Sqlite) into an equivalent query to be executed in Mongodb. SELECT COUNT(*) FROM match_table WHERE…
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answer28
viewsNested Documents
I have a question that I believe is basic for those who are starting with nosql and comes from the classic relational structures. Well, let’s look at a simple example for relational structures: I…
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answer32
viewsMultiple Environments with AWS Dynamodb
There is the possibility to create different environments for development, qa and production using AWS Dynamodb on Amazon?
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answer27
viewsBACKUP CASSANDRA
I am backing up to a 6-node cluster. We are working with consistency factor 3. Do I need to back up all nodes? Or would the backup be interesting only on one of the nodes, since the information…
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answer42
viewsParameters Firebase bank
The flutter has to communicate with firebase the file google-services.json, would have some way to send parameters with the key of another firebase database and projectid?
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answers410
viewsCassandra CQL Shell opens and closes
I started studying about Cassandradb, but I am using Windows. When I start the service 'Datastax DDC Server 3.9.0' I get an error. Looking at the logs, you have the error: Arquivo:…
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answer43
viewsMongodb return last value using filter and grouping by variable
I have the following event being inserted into my Mongodb base { _id:"5c0539158863a16a282917ad", owner:"clientX", source:"Deposito01", metric:"temperature", datetime:"2018-12-03T12:09:25.000Z",…
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answer145
viewsJSON to POJO returning Null
I’m making a request for the site’s API swapi and whenever I do the conversion from JSON to POJO, I get the NULL return RestTemplate restTemplate = new RestTemplate(); String fooResourceUrl =…
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answers170
viewsError inserting data into Lokijs with Vuejs
Hello, I am starting in Electron with Vuejs1.0 && Lokijs and I have had difficulty finding the solution to the error that happens whenever I will insert a second given to Collection: Error:…
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answer109
viewsReplica Mongodb Set Does Not Connect
I’ve climbed a cluster with Docker, and I’m having trouble connecting to the replicaset. The Docker-Compose is on the github and the instructions that surround it in the readme. Remembering that I…
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answer185
viewsSum fields of a Firebase Bank
I need to add the fields of my bank Firebase, that is the field Receita that is inside the collection Dados follows the picture below: I am using the following code to make a simple read, sets to…
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answer129
viewsHow to query by passing an array per parameter in the firestore?
I have a list of documents in the firestore, called shopping. Within each purchase of these, I have a FIELD, called condicaoPagamento, this keeps the condition of payment of the purchase. What I…
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answer31
viewsHow do I updateItem an element nested in Dynamodb?
I have a Map format structure stored in Dynamodb, and would like to add another attribute within the school object, something like: { name: 'Felipe' uid: 112233, data: { structure: { school: { name:…
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answer38
viewsSending data via ajax generating new "_id" in Mongodb
I am sending information via ajax to the backend in Node to update a document in Mongodb, but whenever I send the form via frontend, it generates a new "_id" instead of searching for an existing one…
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answers70
viewsWhich files should be ignored by Git in a Mongodb database?
I am creating an application with Mongodb and after initializing the repository, I entered the command git add * in the root directory of my project. When I went to upload the repository to Github,…
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answer58
viewsNosql . Net compatibility
I would like to know if there is any Nosql bank that is easier to work with. Net (which is easy to integrate, manipulate, create entities by the Entity framework if possible, etc). If you can give…
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answer76
viewsHow to choose between types of Nosql?
Nosql databases have different basic types: Column based Key-value database Graph-based Document based database What are the differences between these types and how to choose between them?…
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answer122
viewsHow to use Mongodb 'Regex' filter in PHP
I have made some attempts following examples on the internet, I found some until there seems to be a mix of the two versions of the driver Currently, in the Mongodb bank I have a structure similar…
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answers25
viewsTo what extent is it advantageous to use Nosql?
I’m developing a little app. It does not have a very large amount of data initially, but it would store for example user data (login), images, and some information in text format. But I intend to…
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answer45
viewsError connecting to Debian localhost database
I created a virtual machine and installed Debian. After I installed the Cassandra and checked the status to know that the bank is running. but when executing the command cqlsh in localhost I get the…
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answers53
viewsBy doubling the value returned when running onDataCahage in FIREBASE, can you help me?
I want to recover the value of a drive in Firebase and save that value whenever the field flag for "noDebitado" and thereafter, with each loop interaction for, I want to set a new value for flag…
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answer167
viewsWhat databases is Apache Atlas compatible with?
apache Atlas supports which SQL and noSQL databases I’m doing a job, and I couldn’t find anything on