Operations of some sys users

Which user does Oracle search for a table?Select owner from dba_tables where table_name = upper ('t_l_tradelist ') 1 nac_user In Oracle, which user does a view belong?Select owner from all_views where view_name = upper ('user _ tab_columns ') 1 sys Display the current instance:Select instance_name from V $ instance; Display current instance parameters:Show parameter instance Queries the number of data connections of each database service. Select count(*), Program FromV $ session Group  ByProgram; Select  Count(*) FromV $ session;

Operations of some sys users