> For the complete documentation index, see [llms.txt](https://lern.sunbird.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://lern.sunbird.org/use/developer-guide/groups/data-models/cassandra.md).
# Cassandra
Cassandra is the primary data store for groups and Redis is used for caching the group API response.
### **Cassandra** Database \[keyspace : sunbird\_groups]
**ER diagram**
#### Groups Keyspace:
```
CREATE KEYSPACE IF NOT EXISTS sunbird_groups WITH replication = {'class':'SimpleStrategy','replication_factor':1};CREATE TABLE IF NOT EXISTS sunbird.user(id text,userId text,userName text, email text,phone text,aadhaarNo text,createdDate text,updatedDate text,updatedBy text,
ode
```
**Group Table**
```
CREATE TABLE sunbird_groups.group (
id text PRIMARY KEY,
activities list>>,
createdby text,
createdon timestamp,
description text,
membershiptype text,
name text,
status text,
updatedby text,
updatedon timestamp
);
CREATE INDEX idx_group_status ON sunbird_groups.group (status);
```
**Group\_Member**
```
CREATE TABLE sunbird_groups.group_member (
groupid text,
userid text,
createdby text,
createdon timestamp,
removedby text,
removedon timestamp,
role text,
status text,
updatedby text,
updatedon timestamp,
visited boolean,
PRIMARY KEY (groupid, userid)
);
CREATE INDEX idx_group_member_status ON sunbird_groups.group_member (status);
```
***
**User\_Group**
```
CREATE TABLE sunbird_groups.user_group (
userid text PRIMARY KEY,
groupid set
);
```
***
---
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