A column family is a NoSQL object that contains columns of related data. It is a tuple (pair) that consists of a key-value pair, where the key is mapped to a value that is a set of columns. In analogy with relational databases, a column family is as a "table".
Questions tagged [column-family]
71 questions
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vote
2 answers
CQL3 Show Column Families
Can anybody tell how to get a list of column families under the current key space in Cassandra 2.0.4?
Kindly note that am using cqlsh to query the server.
Babu James
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2 answers
delete row key from cassandra cli
i set my column family gcgraceseconds to 0;
but stills rowkey is not deleted it remains in my column family
create column family workInfo123
with column_type = 'Standard'
and comparator = 'UTF8Type'
and default_validation_class = 'UTF8Type'
…
Govind Singh
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1 answer
what should I do if depth of my data increases in Cassandra?
How should I model my data for which the depth is more and it might increase in cassandra.
Even if I add super column family, it would increase just one more level. (May be I am wrong, I am newbie to Cassandra).
Assuming my data :
{
Key1 :…
Ayan
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2 answers
How to print configured columnfamilies in cassandra
I'm having some trouble getting a configuration script to match up with the columnfamily names I'm using. I feel like it would be a helpful debugging tool to be able to log all of the currently configured column families.
Is this possible? I've been…
Slater Victoroff
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1 answer
Not enough bytes to read value of component using Composite Columns with Astyanax client
I am tyring to insert into Composite Column in Cassandra column family using Astyanax client. Below is my column family in Cassandra.
create column family USER_DATA
with key_validation_class = 'UTF8Type'
and comparator =…
arsenal
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- 331
1
vote
1 answer
Static Column Family in Cassandra vs Dynamic Column Family?
I have started working with Cassandra and I was going through Static column family and Dynamic column family and I am wondering when do we use static column family as compared to dynamic column family?
In my use case, I will be having huge JSON…
AKIWEB
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1 answer
Cassandra. How to create column family using FluentCassandra API?
I'm trying to create column family with this code
public void CreateAColumnFamily()
{
using (var db = new CassandraContext(keyspace:"Earth",
server: Server))
{
CassandraColumnFamily cf =…
user2686299
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0
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1 answer
How to implement ColumnFamilies in RocksDB in Java?
I am trying to use column families in RocksDB through java binding.
RocksDB.loadLibrary();
String threat = "threat_data";
String ipRange = "ip_range";
options = new DBOptions();
options.setCreateIfMissing(true);
…
Awdsa
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- 2
0
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1 answer
Is there a way to retrieve `ColumnFamilyHandle` from `ColumnFamilyName` in RocksDb?
Alternatively, is there a way to get all the currently open ColumnFamilyHandles from a db?
I am aware of the static function RocksDB.listColumnFamilies. But this returns a List List containing the column family names. Not sure if there is a…
ash_prakasan
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1 answer
How to use cockroachdb column families with liquidbase
In order to manage column updates more effectively cockroach db has a family feature: https://www.cockroachlabs.com/docs/stable/column-families.html
CREATE TABLE test (
id INT PRIMARY KEY,
last_accessed TIMESTAMP,
data BYTES,
FAMILY…
dmitryvim
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0
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2 answers
Querying the size of a column family in RocksDB
Is there a way to know the size of all KVs that are stored in a column family?
Eshkod
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- 3
0
votes
1 answer
Cassandra | Inserting data into two column families with the same row key
If I have 2 column families one for customer info and another for customer address info, how can I insert customer info and their address info to the two separate column families with the same row key(customer id) ?
JayaniH
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1 answer
Does Hbase create a HFile for each column-family or columnFamily:Column?
I am trying to understand the Hbase architecture with respect to Logical data model vs Physical data storage. I am little confused about the HFile creation.
If we have a column family with 2 columns, does Hbase create 2 HFiles or just one?
Below is…
AnswerSeeker
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1 answer
Cassandra data model - column-family
I checked some questions here like Understanding Cassandra Data Model and Column-family concept and data model, and some articles about Cassandra, but I'm still not clear what is it's data model.
Cassandra follows a column-family data model, which…
croraf
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0
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1 answer
Is Apache Cassandra not a good choice for aggregations?
I read that cassandra would not provide sufficient possibilities for aggregations like SUM or AVG.
Actually I thought the column oriented model would be the most appropriate for these kind of operations.
I read many articles, but I am just not…
TJack
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