When I enter in Designer it says "DB Queue Processor procesing is on hold" What does it mean?

Hello to everbody

When I enter in Designer (production environment) it says:

DB Queue Processor procesing is on hold because the database has to be compiled. No new calcultion will be carried out in the database

What does it mean and what must I do?

All changes I made to scripts were committed to database.

Thank you in advance