Flexible immutable entity database
Project description
Savior Database
Embedded schema-less database library backed by LMDB.
Currently in development and not stable yet. The interface and disk format may change in future versions without notice. You probably shouldn't use it to store important data.
Permissively licensed with the ISC License.
Goals
- provide a language-neutral disk format
- utilize LMDB's properties like transactions, append-only writes, and zero-copy reads
- provide intuitive schema-less entity modeling and querying interface
- you shouldn't have to know what questions you want to ask about your data before you start storing it
Developer Interface
There are three actions you can perform on entities in a transaction:
- create
- fetch
- update
- query
An entity is conceptually like a dictionary with attributes and values.
A table is an isolated section of the database for storing entities, usually with a similar set of attributes.
Disk Format
All entities of the same type are stored in one inner LMDB database There is no guarantee that entities have a consistent schema.
Entities are stored on disk as a series of timestamped attribute changes.
- key-value entries have the form
(uuid, timestamp, attribute) -> value
uuid
is an auto-generated entity IDtimestamp
is an auto-generated timestamp of when the entry was appendedattribute
andvalue
are the updated entity key value entries
Data is not modified for updates, only appended to indicate the entity changed.
Project details
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