Questions tagged [cassandra]

Apache Cassandra is an open source distributed database management system. It is designed to handle very large amounts of data spread out across many commodity servers while providing a highly available service with no single point of failure. It is a NoSQL solution.

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Database latency vs throughput

I'm a bit confused by terms latency and throughput in case of databases. My understanding is that latency represents time needed to perform a single request (e.g. insert or select), while the ...
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how to import a huge csv file into Cassandra?

I am trying to import a csv file into Cassandra which is very long. These are food products: ingredients, nutrition, labels... It comes from Open Food Data. List information on food products: ...
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Error while starting Cassandra 2.0.2 service

I am new to cassandra NoSQL database. When I tried to start cassandra I am getting bellow error. Command used to start. ./cassandra -f xss = -ea -javaagent:./../lib/jamm-0.2.5.jar -XX:+...
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Setup Cassandra Database

I have a very simple cassandra database with just one table containing the following records: device ID - long integer representing the device the 'value' came from - primary key tag ID ...
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What kind of database is Cassandra DB?

I was taking some courses to understand better the way Cassandra works (at academy.datastax.com) and by what I gathered it came to me that it is a Key Value Database because of the way it stores data ...
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What is the Cassandra setting for coordinator timeouts for schema change queries?

In my testing, I've found that the write_request_timeout_in_ms setting does not have any bearing on the timeouts for CREATE TABLE or ALTER TABLE statements in CQL. For instance, I have it set to ...
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428 views

Cassandra cqlsh browser queries possible only in bytes

I am using Cassandra database through cqlsh client on Linux. I can make only queries with values given as bytes, but I would like to search with the client like in SQL where everything is Strings. ...
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1answer
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Stopping N number of nodes of a Cassandra cluster running on a single machine using bash script

I have set up a Multi-Node cassandra (3.11) cluster (with N nodes) in a single Ubuntu machine. I have written a bash script which Creates N copies of conf folder Configures the cassandra yaml file ...
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Database migration for Large Data Set from MySQL to NoSQL

I have an existing APP that has N types of products that is normalized with MySQL. Each types of products have over 500K skus, and one of them are in the in 2M currently. We are currently tracking on ...
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1answer
495 views

Slow select from one billion rows GreenPlum DB

I've created the following table on GreenPlum: CREATE TABLE data."CDR" ( mcc text, mnc text, lac text, cell text, from_number text, to_number text, cdr_time timestamp ...
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Database software advice [closed]

I have this strange question. I'm building a service that stores information into one table. That table has 20 columns. My database will have many billion rows. Right now I'm using Cassandra, but it ...
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How can I generate Cassandra data model from a MySQL schema?

Is there a tool for generating a Cassandra model from a MySQL database?