Limitations

Cells in a partition: ~2 billion (2^31); single column value size: 2 GB (1 MB is recommended)

Clustering column value length of: 65535 (2^16 - 1)

Key length: 65535 (2^16 - 1)

Table / column family name length: 222 characters

Keyspace name length: 222 characters

Query parameters in a query: 65535 (2^16 - 1)

Statements in a batch: 65535 (2^16 - 1)

Fields in a tuple: 32768 (2^15) (just a few fields, such as 2 to 10, are recommended)

Collection (list): collection limit is ~2 billion (2^31); values size is 65535 (2^16 - 1)

Collection (set): collection limit is ~2 billion (2^31); values size is 65535 (2^16 - 1)

Blob size: 2 GB (less than 1 MB is recommended)

Vector: maximum dimension is 8K (2^13)