On at least enwiki, there is a "namespaces" database table that appears to be unused and unneeded.
Its schema:
MariaDB [enwiki_p]> describe namespaces;
+-------+---------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+---------+------+-----+---------+-------+
| i | int(11) | YES | NULL | ||
| v | blob | YES | NULL | ||
+-------+---------+------+-----+---------+-------+
2 rows in set (0.03 sec)
Its contents:
MariaDB [enwiki_p]> select * from namespaces;
+------+----------------+
| i | v |
+------+----------------+
| 0 | |
| 1 | Talk |
| 2 | User |
| 3 | User_talk |
| 4 | Wikipedia |
| 5 | Wikipedia_talk |
| 6 | Image |
| 7 | Image_talk |
| 8 | MediaWiki |
| 9 | MediaWiki_talk |
| 10 | Template |
| 11 | Template_talk |
| 12 | Help |
| 13 | Help_talk |
| 14 | Category |
| 15 | Category_talk |
+------+----------------+
16 rows in set (0.03 sec)
This database table should be dropped from all Wikimedia wikis.
Version: wmf-deployment
Severity: enhancement