While working on m5 master I realised that the nova database has not had any writes for a year or so:

root@db1133:/srv/sqldata/nova# ls -lhrt *.ibd | tail -n5
-rw-rw---- 1 mysql mysql  48M Apr 16  2019 instance_metadata.ibd
-rw-rw---- 1 mysql mysql 2.9G Apr 16  2019 instance_system_metadata.ibd
-rw-rw---- 1 mysql mysql 484M Apr 16  2019 block_device_mapping.ibd
-rw-rw---- 1 mysql mysql 304K Apr 17  2019 compute_nodes.ibd
-rw-rw---- 1 mysql mysql 128K Apr 26  2019 services.ibd

Same for nova_api

root@db1133:/srv/sqldata# ls -lhrt nova_api/*.ibd | tail -n5
-rw-rw---- 1 mysql mysql 128K May 23  2018 nova_api/flavor_extra_specs.ibd
-rw-rw---- 1 mysql mysql 128K May 23  2018 nova_api/cell_mappings.ibd
-rw-rw---- 1 mysql mysql  96K May 23  2018 nova_api/migrate_version.ibd
-rw-rw---- 1 mysql mysql 176K Apr 16  2019 nova_api/build_requests.ibd
-rw-rw---- 1 mysql mysql 364M Apr 16  2019 nova_api/request_specs.ibd

Can those be removed?

Thanks

Manuel