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 ...

I'm thinking about using "lock" S3 objects in order to prevent simultaneous identical operations on a given S3 object. But I have great doubts about the validity of this technical solutio...

The whole reason why DynamoDB is fast and scalable is based on the fact that it is eventually consistent. But at the same time, it comes with this ConsistentRead option for operations like get, bat...

I can not find the documentation for this. I know there is a consistency command in cqlsh, but there is no distinction between read and write consistency. How would I set different consistency leve...

I am making a file uploader using Cloud Storage which is experiencing non-consistent behaviour which seems contrary to the documentation. When you upload an object to Cloud Storage, and you receiv...

I couldn't understand the different between a request and a statement and how consistency is related to each of them.

I read about Cassandra 2's lightweight transactions. Is the consistency level of such a write always at QUORUM? Would this mean that even if I have a multi data center setup with 100s of nodes, the...

In CAP theorem, Redis is specified as a database which lacks availability (which has partition tolerance and consistency). But there are many places where Redis is considered as a high availability...

I've done a bit of research on using session token in cosmosdb's dotnet v3 sdk, and so far I found these two links that give me some hints on how to use it: utilize-session-tokens and how-to-conver...

Suppose that a given table already contains the following key value pair: { "id": "one", "num": 5000 } If I write an update expression such as "ADD num :val" to add values as necessary can I ex...

According to the "Guide to Scaling Web Databases with MySQL Cluster", MySQL Cluster 7.3 can acchieve 99,999% availability while using synchronous update replication. This would be a antithesis to t...

There is a great talk here about simulating partition issues in Cassandra with Kingsby's Jesper library. My question is - with Cassandra are you mainly concerned with the Partitioning part of the...

Sequential consistency The result of any execution is the same as if the operations of all the processors were executed in some sequential order, and the operations of each individual processo...

I am looking for a good, up to date and "decision helping" explanation on how to choose a NoSQL database engine for storing all the events in a CQRS designed application. I am currently a newcomer...

We are choosing the best option for implementing a leader election for our service (written in Java) comprised of multiple (e.g., 3) instances for high availability. Our goal is to have only a sing...

I have found people answering differences between linearizability and searializability, but nowhere have I found people either saying that serializability is same as sequential consistency or it is...

I am looking to validate both my Dto's and Domain models using FluentValidation. I already defined a Validator class to validate my Dto as seen below. However if I want to add a Validator for my ...

I have taken a database class this semester and we are studying about maintaining cache consistency between the RDBMS and a cache server such as memcached. The consistency issues arise when there a...

There are two definitions I found on the Internet: Sequential consistency -- the result of any execution is the same as if the operations of all the processors were executed in some sequential ord...

I am wondering how to solve transactional consistency problems between aggregates. My first impression is that whenever you need transactional consistency between aggregates, you wrongly designed y...

I am reading about ACID properties of a database. Atomicity and Consistency seem to be very closely related. I am wondering if there are any scenarios where we need to just support Atomicity but no...

I'm looking for an algorithm where groups of connected nodes can be merged together to form a new group (by creating links between nodes from different groups). And where a group can be partitioned...

Can anyone explain me the definitions and differences between sequential consistency and quiescent consistency? In the most dumb form possible :| I did read this: Example of execution which is seq...

For the sake of question, let's say i have 2 microservices. Identity management Accounting I know that each microservice should not be tightly coupled and it should have it's own database. Let...

I know that Cassandra have different read consistency levels but I haven't seen a consistency level which allows as read data by key only from one node. I mean if we have a cluster with a replicati...