host      user    DB  usage select insert show view  ...
--------- ------- --- ----- ------ ------ ---------  ...
localhost jma_dbo jma **    **     **     **
localhost jma_ro  jma **    **            Y
localhost jma_ro  uat **    Y*     Y      
localhost jma_rw  jma Y     Y      Y      Y
prod      robo    jma Y     **            **
 . . .