JIRA Database

[Jesica Blink]

Hi, there is a lot of information. Specific demand information that I need is:

1. What is  JIRA database and JIRA add-ons relationship?
2. Is there only one database? Is JIRA add-on adds indormation in JIRA database? Or JIRA add-on has it's own database?
3. How the transfer of data is going between Jira and it's add-ons?
4. How add-ons gets info from  ex.: JIRA  issue (issue ID)?
5. Where I can find this information? 
   Thank You !

[Vasiliy Zverev]

1) Addons can: 

• store data into a separate database
• store it into Active objects: https://developer.atlassian.com/docs/atlassian-platform-common-components/active-objects

2) JIRA has single DB https://developer.atlassian.com/jiradev/jira-platform/jira-architecture/database-schema

3) Active object / custom functions

4) Usually with REST calls

See here for documentation: https://developer.atlassian.com/