# Which Problems Are Solved
Instance domains are only computed on read side. This can cause missing
domains if calls are executed shortly after a instance domain (or
instance) was added.
# How the Problems Are Solved
The instance domain is added to the fields table which is filled on
command side.
# Additional Changes
- added setup step to compute instance domains
- instance by host uses fields table instead of instance_domains table
# Additional Context
- part of https://github.com/zitadel/zitadel/issues/8999
This implementation increases parallel write capabilities of the eventstore.
Please have a look at the technical advisories: [05](https://zitadel.com/docs/support/advisory/a10005) and [06](https://zitadel.com/docs/support/advisory/a10006).
The implementation of eventstore.push is rewritten and stored events are migrated to a new table `eventstore.events2`.
If you are using cockroach: make sure that the database user of ZITADEL has `VIEWACTIVITY` grant. This is used to query events.
