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Limits¶

This document provides hard and soft limits in ScyllaDB.

Cluster and Node Limits¶

Component	Limit
Nodes per cluster	Low hundreds
Node size	256 vcpu

See Hardware Requirements for storage and memory requirements and limits.

Component	Limit
Keyspaces per cluster	Thousands (tested with 1000)
Tables per keyspace	Low thousands (tested with 5000)
Tables per cluster (including indexes)	Thousands
Tables with CDC enabled	No limit. CDC can be enabled for all tables in a cluster.
Materialized views and secondary indexes per table	Low tens
Columns per table	Hundreds
Columns per cluster	Tens of thousands
Partition size	Gigabytes
Rows per partition	No limit
Row size	Latency-related soft limit: Hundreds of kilobytes (good latency) or megabytes (mediocre latency)
Key length	65533
Table / CF name length	48 characters
Keyspace name length	48 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 2-10, are recommended)
Collection (List)	~2 billion (2^31)
Collection (Set)	~2 billion (2^31)
Collection (Map)	Number of keys: 65535 (2^16-1)
Blob size	2 GB ( less than 1 MB is recommended)

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