** Changed in: neutron
Status: Expired => In Progress
** Changed in: neutron
Status: In Progress => New
** Changed in: neutron
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1988421
Title:
Duplicate indexes in table ports of neutron database
Status in neutron:
Incomplete
Bug description:
Currently the primary key and an additional unique index are configured on
the same column.
This is why sqlalchemy logs a warning on a database migration displaying
following information:
```
/usr/lib/python3/dist-packages/pymysql/cursors.py:170: Warning: (1831,
'Duplicate index `uniq_instances0uuid`. This is deprecated and will be
disallowed in a future release')
result = self._query(query)
```
(This example is actually taken from the nova output, but looks just the
same for Keystone.
There actually is the same issue within Nova schemas, see bug
https://bugs.launchpad.net/nova/+bug/1641185)
From my understanding of the documentation of mysql (see [1] [2]) and
postgres (see [3] [4]) a unique constraint, which is created in the
first place, automatically creates an index for the column(s). So
there should be no need to create an additional index for the same
column:
```
Table: ports
(https://opendev.org/openstack/neutron/src/commit/732c1dcbc2fe95bc3d8b6a61b124d59595958b4f/neutron/db/models_v2.py#L128)
Columns: network_id, mac_address
Indexes:
Unique Constraint: uniq_ports0network_id0mac_address
Index: ix_ports_network_id_mac_address
```
[1]
https://dev.mysql.com/doc/refman/8.0/en/create-index.html#create-index-unique
[2] https://dev.mysql.com/doc/refman/8.0/en/mysql-indexes.html
[3]
https://www.postgresql.org/docs/current/ddl-constraints.html#DDL-CONSTRAINTS-UNIQUE-CONSTRAINTS
[4] https://www.postgresql.org/docs/current/indexes-types.html
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