I have a wide-format longitudinal dataset with a set of variables that indicate what state a participant lived in for each year of the study period. I ...
I have a wide-format longitudinal dataset with a set of variables that indicate what state a participant lived in for each year of the study period. I ...
I'm trying to understand if HBase is a Column-oriented DB. I understand the structure of one row of HBase - it is divided into column families(which a ...
There are lots of confusions among these terms. I'd like to through my understanding out and see if people agree. I have seen conflicting and wrong de ...
Googling for a definition either returns results for a column oriented DB or gives very vague definitions. My understanding is that wide column store ...
I've searching but haven't find the answer. I have the next dataframe And this is the desired output: I put the desired output in an image beca ...
As far as I know, wide-column cannot be applicable. But is there a difference in efficiency to put big data into the node? I'd like to put an index ...
To start with I've successfully converted my data from long to wide format. The data is as below. To convert the above table from long to wide form ...
I have a Cassandra cluster running on Ubuntu. I would like to enable authentication so that not everyone will have access to the Cassandra database an ...
In the paper of Bigtable, it is represented with A Distributed Storage System for Structured Data. I'm confused with the terms "structured data". I k ...
I don't know wether there is a concept of wide columns now or not. What is the definition of a wide column? How many columns in a wide column? What i ...
How can I paginate data inside partition? I can`t use token for this, so I made microtime field with creation time and ordered records by it. Now I am ...
I am using cassandra db with billions of records, and I want to store data grouped by date. The problem is that I should query records with different ...
I'm working on a analysis assignment, we got a partial data-set from the university Library containing almost 300.000.000 rows. Each row contains: ...
pandas data frame are in general represented in long ( a lot of rows) or wide (a lot of columns) format. I'm wondering which format is faster to rea ...
A few days ago I read about wide-column stored type of NoSQL and exclusively Apache-Cassandra. What I understand is that Cassandra consist of: A key ...
HBase and Cassandra are built as wide column stores, using the concepts of both rows and columns. A row is composed of a key similar to the concept o ...
Columnar database should store group of columns together. But Cassandra stores data row-wise. SS Table will hold multiple rows of data mapped to their ...
Reading several papers and documents on internet, I found many contradictory information about the Cassandra data model. There are many which identify ...