# Which Problems Are Solved
The connection pool of go uses a high amount of database connections.
# How the Problems Are Solved
The standard lib connection pool was replaced by `pgxpool.Pool`
# Additional Changes
The `db.BeginTx`-spans are removed because they cause to much noise in
the traces.
# Additional Context
- part of https://github.com/zitadel/zitadel/issues/7639
(cherry picked from commit 99c645cc60628db9abf1c92688b6010a4066f5a6)
feat(db): wrap BeginTx in spans to get acquire metrics
This changes adds a span around most db.BeginTx calls so we can get tracings about the connection pool acquire process.
This might help us pinpoint why sometimes some query package traces show longer execution times, while this was not reflected on database side execution times.
Co-authored-by: Silvan <silvan.reusser@gmail.com>
(cherry picked from commit 093dd57a787f6bfe18a990d17354ad096f06f349)
* chore: use pgx v5
* chore: update go version
* remove direct pq dependency
* remove unnecessary type
* scan test
* map scanner
* converter
* uint8 number array
* duration
* most unit tests work
* unit tests work
* chore: coverage
* go 1.21
* linting
* int64 gopfertammi
* retry go 1.22
* retry go 1.22
* revert to go v1.21.5
* update go toolchain to 1.21.8
* go 1.21.8
* remove test flag
* go 1.21.5
* linting
* update toolchain
* use correct array
* use correct array
* add byte array
* correct value
* correct error message
* go 1.21 compatible
* fix(eventstore): differentiate unique constraint error format
* docs: add comment to eventstore vars
* fix(eventstore): return correct error type if unique constraint already exists
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.
