mysql - User always appear to be online? -



mysql - User always appear to be online? -

i'm regularly updating lastly activity of each user on actions in order able online users later. when run query below, me result if user online :

select * info last_activity + interval 30 sec > now() , for_whom = '1461' , is_deleted=0

i tried alter last_activity column value lower time, row returned. ?

please create sure you're updating lastly activity mysql's now(), not explicit datetime source.

also, query much faster if create index on info (for_whom, is_deleted, last_activity) , rewrite query little:

select * info for_whom = 1461 , is_deleted = 0 , last_activity > now() - interval 30 sec

mysql phpmyadmin

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