Cassandra Data Types
Cassandra supports different types of data types. Let?s see the different data types in the following table:
| CQL Type | Constants | Description |
|---|---|---|
| ascii | Strings | US-ascii character string |
| bigint | Integers | 64-bit signed long |
| blob | blobs | Arbitrary bytes in hexadecimal |
| boolean | Booleans | True or False |
| counter | Integers | Distributed counter values 64 bit |
| decimal | Integers, Floats | Variable precision decimal |
| double | Integers, Floats | 64-bit floating point |
| float | Integers, Floats | 32-bit floating point |
| frozen | Tuples, collections, user defined types | stores cassandra types |
| inet | Strings | IP address in ipv4 or ipv6 format |
| int | Integers | 32 bit signed integer |
| list | Collection of elements | |
| map | JSON style collection of elements | |
| set | Collection of elements | |
| text | strings | UTF-8 encoded strings |
| timestamp | Integers, Strings | ID generated with date plus time |
| timeuuid | uuids | Type 1 uuid |
| tuple | A group of 2,3 fields | |
| uuid | uuids | Standard uuid |
| varchar | strings | UTF-8 encoded string |
| varint | Integers | Arbitrary precision integer |
Cassandra Automatic Data Expiration
Cassandra provides functionality by which data can be automatically expired.
During data insertion, you have to specify 'ttl' value in seconds. 'ttl' value is the time to live value for the data. After that particular amount of time, data will be automatically removed.
