Query on Jira filters?

Question

Hi, I have a confusion about the Jira filter designs, need some comments on the same

Let’s Say, There are 1000 projects in JIRA and there is a custom field ‘Team’ which has many values but one of them is 'Spartans' which is only used by Project A and Project B. And there are 2 queries.

JQL 1: Project in (Project A, Project B)  AND Team = 'Spartans'

JQL 2: Team = ‘Spartans’

Logically, both the queries will return the same set of issues because for the field ‘Team’, Project A and Project B will only have the ‘Spartans’ as a value. But I would like to know if there will be a difference in terms of performance in both the queries. I am not sure how JIRA search for the issues, But in 2nd JQL will it look up all the projects? and in the same way when I have mentioned the project names will it reduce the scope of search from 1000 projects to 2 projects and reduce the response time And also helps to perform Jira better if we have too many board like these?

-Vineet

Phill Fox · Accepted Answer

It is always best to reduce the scope as much as possible especially if the custom field Team is shared across other projects that may for some reason in the future start to use the "Spartans" value as this could then give you challenges with your filter results.

Performance-wise a search restricted to a subset of projects should be quicker than one across all projects but this should always be validated against your particular configuration and version.