imay commented on issue #3285: Replica usage should be limited in database 
level to reduce the fe memory pressure and the amount of tablet in be   
URL: 
https://github.com/apache/incubator-doris/issues/3285#issuecomment-611386458
 
 
   > at the moment, replica quota will be checked when create table or alter 
table then the replica count would be collected , or when we execute "show 
data" command or other show proc command can trigger the replica statistics 
collect operation.
   
   This will traverse all the metadata of a database, I don't think this is a 
good idea. It may hold the database lock for a long time.

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