column-oriented | 易学教程

Differences between NoSQL databases

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问题 NoSQL term has 4 categories. Key\value stores Document oriented Graph Column oriented. From my point of view all these data modeling has same definition, What are differences? Key\value database maintains data in structure like object in OOP. having access to data is base on unique key. Column oriented is an approach like key\value! But in key\value, you cant access to value by query. I mean, queries are key-based. Compare 1st & 2nd picture from 2 different categories. Document oriented

Recommendations for column-oriented database [closed]

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问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 8 years ago . I've found databases typically come in two flavors, your traditional row-oriented RDBMS or an object oriented database (OODBMS).

Why many refer to Cassandra as a Column oriented database?

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Reading several papers and documents on internet, I found many contradictory information about the Cassandra data model. There are many which identify it as a column oriented database, other as a row-oriented and then who define it as a hybrid way of both. According to what I know about how Cassandra stores file, it uses the *-Index.db file to access at the right position of the *-Data.db file where it is stored the bloom filter, column index and then the columns of the required row. In my opinion, this is strictly row-oriented. Is there something I'm missing? Yes, the "column-oriented"

Is Cassandra a column oriented or columnar database

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问题 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 corresponding partition key. So I feel like Cassandra is a row wise data store like MySQL but has other benefits like "wide rows" and every columns are not necessarily to be present for all the rows and of course it's in memory . Please correct me if I'm wrong. 回答1: If you go to the Apache Cassandra project on GitHub, and scroll down to the

Why many refer to Cassandra as a Column oriented database?

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问题 Reading several papers and documents on internet, I found many contradictory information about the Cassandra data model. There are many which identify it as a column oriented database, other as a row-oriented and then who define it as a hybrid way of both. According to what I know about how Cassandra stores file, it uses the *-Index.db file to access at the right position of the *-Data.db file where it is stored the bloom filter, column index and then the columns of the required row. In my