https://bugzilla.wikimedia.org/show_bug.cgi?id=54107

Tim Landscheidt <[email protected]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|SQL queries on replica      |*_userindex tables need to
                   |tables take much longer     |be documented
                   |than on the Toolserver      |

--- Comment #1 from Tim Landscheidt <[email protected]> ---
For queries that select on rev_user, there is the table "revision_userindex":

| MariaDB [dewiki_p]> select rev_timestamp from revision_userindex where
rev_user=336793 order by rev_timestamp asc limit 1;                             
| +----------------+                                                            
| | rev_timestamp  |                                                            
| +----------------+
| | 20070115154431 |
| +----------------+
| 1 row in set (0.05 sec)

| MariaDB [dewiki_p]>

Unfortunately, it isn't documented at [[wikitech:Nova Resource:Tools/Help]] (so
far :-)).  I'll leave that to Coren as my knowledge of what and when is purely
based on word of mouth.

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