[wp-trac] [WordPress Trac] #31746: get_blogs_of_user() can be very slow when a user is a member of thousands of sites

[WordPress Trac]

#31746: get_blogs_of_user() can be very slow when a user is a member of thousands
of sites
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 Reporter:  jtsternberg   |       Owner:  johnbillion
     Type:  defect (bug)  |      Status:  reviewing
 Priority:  normal        |   Milestone:  Future Release
Component:  Users         |     Version:  3.0
 Severity:  normal        |  Resolution:
 Keywords:  has-patch     |     Focuses:  multisite
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Comment (by nerrad):

 Just thought of an '''Option 3'''  add a blog_id column to the user_meta
 column.  Then instead of having to prefix any meta_key specific to a blog
 you just put the blog_id in its OWN column.  Then any queries retrieving
 the blogs a user belongs to can just grab distinct blog ids.

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Ticket URL: <https://core.trac.wordpress.org/ticket/31746#comment:21>
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