Joins

Not Supported

Joins are not supported in SenseiDB since it is not a strictly relational database.

Views

Not Supported

Isolation Levels

Read Uncommitted

The users are responsible for guaranteeing data isolation.

Query Interface

Custom API

Browsing Query Language (BQL) is supported by SenseiDB, which has the similar syntax to SQL.

Concurrency Control

Not Supported

SenseiDB partitions its data within the system to improve processing speed, but it only accepts a single data stream at a time.

Stored Procedures

Not Supported

Indexes

Hash Table

SenseiDB applies an indexing manager called Zoie, which is a real-time search and indexing system supporting forward-rolling indexing.

Data Model

Column Family / Wide-Column

A SenseiDB instance is a table of data that is organized into columns. Each column may fall into one of the supported types: string, int, long, short, float, double, char, date, text.

Storage Architecture

Disk-oriented

Data is replicated in multiple disks to be robust against failures.

System Architecture

Shared-Disk

The entire database is partitioned into a number of shards. Each shard is replicated across N nodes so that there might be more than one shards in a single node. Below is an example of a Sensei cluster.