5 | | Another problem is querying for which user IDs are subscribed to which forums or topics requires a specific `FIND_IN_SET` MySQL flag, which ends up transversing those serialized `wp_usermeta` values looking for post IDs. Yuck. |
| 5 | Another problem is querying for which user IDs are subscribed to which forums or topics requires a specific `FIND_IN_SET` MySQL flag, which ends up transversing those serialized `wp_usermeta` values looking for post IDs. |
| 6 | |
| 7 | This logic fails hard with Notifications: when replying to a topic or creating a new topic in a forum, querying for all subscribed users to notify them via email, is a query that does not perform very well when there are millions of rows in `wp_usermeta`. |