That is backward incompatible schema change relying on the fact that all
resources use keystone tenant_ids only.

** Changed in: neutron
   Importance: Undecided => Low

** Tags added: db

** Changed in: neutron
       Status: New => Confirmed

** Changed in: neutron
       Status: Confirmed => Opinion

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https://bugs.launchpad.net/bugs/1361190

Title:
  Too huge space reserved for tenant_id in the database

Status in OpenStack Neutron (virtual network service):
  Opinion

Bug description:
  Keystone defines the project/user/domain IDs as varchar(64), but
  neutron uses varchar(255) on every resources.

  But the  tenant id actually generated by keystone is 32 character.

  Please change to the tenant id lengths to <=64 >=32.

  The record size has impact on the memory usage  and to the db/disk
  caching efficiency.

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