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Column Family Store - Coggle Diagram
Column Family Store
Characteristics
Consistency
Correct spelling operation
Confirmation registration
Writing to a memory structure
Scripts are stored in SSTables
Transaccions
Atomic transactions per row
Columns are updated
The transaction can succeed or fail.
Availability
Can be increased by reducing the level of consistency of applications
You must configure the keyspaces and read-write operations to your preferences.
Query Features
Basic Queries
Advanced Queries and Indexing
Cassandra Query Language
Suitable Use Cases
Event Logging
Content Management Systems, Blogging Platforms
Counters
Expiring Usage
What is a column family data store?
Data storage in column families associated to a row key
Examples: Cassandra, HBase, Hypertable, Amazon SimpleDB
Basic storage unit
Columns
Key-value where the value is with write-mark
Timestamps
Solves writing conflicts
Treats obsolete data
Expires data
Supercolumn
Stores a collection of columns
Consultation features
Basic queries
Get
Returns the family of columns that has a key.
Set
Sets a value on a specific key or creates it.
Supr
Removes a key
Advanced queries
It is allowed to index columns other than the column family keys
Work well for low cardinality values
When not to use
Systems that require ACID transactions for writes and reads.