GeminiDB HBase API vs SWC-DB

GeminiDB HBase API has no write-up on Specifiction yet; its figures are above.

SWC-DB is a self-hosted Super Wide Column Database that the maker describes as a key-value, wide-column NoSQL and time-series database. It supports SQL, but SQL has no joins, and the system is designed for very large data volumes. Its data model uses cell keys made from lists of fractions with timestamps, with numerous columns rather than tables or namespaces. Data can have automatic or user-defined versions, ordered ascending or descending, with a configurable maximum retained. The maker describes ACID concepts for a single data entry; writes across multiple entries are not atomic as a group. Communications can use SSL, but transaction security also depends on the configured filesystem and clients supporting a secure layer. User-concept access controls are unsupported. A cluster utility can deploy, start and stop distributed clusters. Downloads include tar.xz and Debian packages, with Arch Linux AUR packages also described. SWC-DB is free under GPLv3; commercial-purpose licensing inquiries are invited for uses limited by that license.