For a fairly popular and important user tool, (check its use here) I need to query Wikipedia database about backlinks of a page but it seems unlike Wikipedia servers, labs' replicas doesn't have access to that index.
For example run this on ckbwiki_p on labs:
SELECT COUNT(*) FROM pagelinks WHERE pl_title="Main_page";
Then try to do the same on fawiki_p or enwiki_p (you will get stuck and timeout on large databases).. Can you please provide that index to labs users? Thanks