Checkpoints[07]

Compression[08]

SequoiaDB uses BSON (binary JSON) format to encode and store JSON format data.

Data Model[09][10]

SequoiaDB supports relational, semi-structured (e.g. JSON), and unstructured (e.g. POSIX file) data models. Data model in storage is JSON.

Indexes[10][11]

Indexes in SequoiaDB use conventional B-trees. An index has a unique name for the index on the data collection and a JSON object that defines the indexing criteria and direction. Indexes can be unique or non-unique. If an index is unique, it can be null-able or non-null-able.

In addition to regular indexes, SequoiaDB supports full-text searching via Elasticsearch.

Isolation Levels[12]

SequoiaDB supports three levels of isolation - read uncommitted, read committed, and read stability. By default, the system is configured as read uncommitted.

Logging[13][07][14]

The system implements logical logging and log replay to support data consistency across distributed replicas.

Query Interface[15]

System Architecture[10]

The system is configurable to deploy on a single node or on multiple distributed nodes. In a distributed environment, coordination nodes and catalog nodes share disk space, while storage nodes are given separate disk space. The storage nodes can be configured to share disk or each to be given nonshared disk.