Recent questions tagged NoSql

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nosql - How much data per node in Cassandra cluster?

Where are the boundaries of SSTables compaction (major and minor) and when it becomes ineffective? If I have ... there best practices for this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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nosql - How to concatenate arrays from multiple documents in MongoDB?

Let's say I have a collection called 'people' with the following documents: { "name": "doug", "colors": ["blue", ... , "blue", "purple", "pink"] See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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nosql - How to implement pagination when using amazon Dynamo DB in rails

I want to use amazon Dynamo DB with rails.But I have not found a way to implement pagination. I will use AWS:: ... FROM `People` LIMIT 1 , 30 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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nosql - how Cassandra chooses the coordinator node and the replication nodes?

How the Cassandra client chooses the coordinator node? is the coordinator node stores the data sent by the client before replicating? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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nosql - Cassandra column key auto increment

I am trying to understand Cassandra and how to structure my column families (CF) but it's quite hard since I ... to get started with Cassanda. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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566 views

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nosql - How to implement "trigger" for redis datastore?

I have a program, which will poll on a certain key from the redis datastore, and do something when the ... and interrupt. Is this possible? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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nosql - Cassandra time series data

We are looking at using Cassandra to store a stream of information coming from various sources. One issue we are ... in noSQL stores in general? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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nosql - WHERE clause on an array in Azure DocumentDb

In an Azure Documentdb document like this { "id": "WakefieldFamily", "parents": [ { "familyName": " ... should handle queries like these ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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nosql - Clustering Keys in Cassandra

On a given physical node, rows for a given partition key are stored in the order induced by the clustering ... is induced by clustering keys? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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nosql - Using a Relational Database for Schemaless Data - Best Practices

After reading a shocking article written by Bret Taylor (co-creator of FriendFeed; current CTO of Facebook), How ... of a relational database? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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555 views

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nosql - Scan HTable rows for specific column value using HBase shell

I want to scan rows in a HTable from hbase shell where a column family (i.e., Tweet) has a particular ... I checked this question as well. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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586 views

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nosql - Scan with filter using HBase shell

Does anybody know how to scan records based on some scan filter i.e.: column:something = "somevalue" Something like this, but from HBase shell? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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554 views

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nosql - Eventual consistency in plain English

I often hear about eventual consistency in different speeches about NoSQL, data grids etc. It seems that ... any concrete data storage? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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642 views

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nosql - Is Cassandra a column oriented or columnar database

Columnar database should store group of columns together. But Cassandra stores data row-wise. SS Table will hold multiple ... me if I'm wrong. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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863 views

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nosql - How can I resize a mongodb capped collection without losing data?

How can I resize a mongodb capped collection without losing data? Is there a command for that, or could somebody provide a script? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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596 views

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nosql - How to sum the value of a key across all documents in a MongoDB collection

I have collection in MongoDB: { "_id" : ObjectId("4d2407265ff08824e3000001"), "subida" : 3.95 } { "_id" : ObjectId(" ... : { "subida" : 17.47 } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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468 views

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nosql - What's the attraction of schemaless database systems?

I've been hearing a lot of talk about schema-less (often distributed) database systems like MongoDB, CouchDB, ... of the traditional RDBMS. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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nosql - Why many refer to Cassandra as a Column oriented database?

Reading several papers and documents on internet, I found many contradictory information about the Cassandra data model. ... I'm missing? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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396 views

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nosql - Elastic search - tagging strength (nested/child document boosting)

Given the popular example of a post that has a collection of tags, let's say that we would want each tag to ... exact terms in the tags names) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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538 views

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nosql - Difference between HBase and Hadoop/HDFS

This is kind of naive question but I am new to NoSQL paradigm and don't know much about it. So if somebody can ... as SQL does. Is it correct? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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665 views

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nosql - Filtering embedded documents in MongoDB

I am having trouble grasping how to filter embedded documents in MongoDB, and am starting to think I should be ... intensive in the long run) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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479 views

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nosql - Pros/cons of document-based databases vs. relational databases

I've been trying to see if I can accomplish some requirements with a document based database, in this ... database for these requirements? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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461 views

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nosql - Difference between CouchDB and Couchbase

Are there any essential differences between CouchDB and Couchbase. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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648 views

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nosql - MAX(), DISTINCT and group by in Cassandra

I am trying to remodel a SQL database Cassandra such that, I can find the Cassandra equivalent for the SQL ... on any other possible methods.. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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