# Which Problems Are Solved
The resource usage to query user(s) on the database was high and
therefore could have performance impact.
# How the Problems Are Solved
Database queries involving the users and loginnames table were improved
and an index was added for user by email query.
# Additional Changes
- spellchecks
- updated apis on load tests
# additional info
needs cherry pick to v3
(cherry picked from commit 4df138286b673255319b20b685f1cba31c05b47d)
* partial work done
* test IAM membership roles
* org membership tests
* console :(, translations and docs
* fix integration test
* fix tests
* add EnableImpersonation to security policy API
* fix integration test timestamp checking
* add security policy tests and fix projections
* add impersonation setting in console
* add security settings to the settings v2 API
* fix typo
* move impersonation to instance
---------
Co-authored-by: Livio Spring <livio.a@gmail.com>
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.
feat(storage): read only transactions for queries (#6415)
* fix: tests
* bastle wie en grosse
* fix(database): scan as callback
* fix tests
* fix merge failures
* remove as of system time
* refactor: remove unused test
* refacotr: remove unused lines
