1、查詢oracle的連接數(shù)select count(*) from v$session;2、查詢oracle的并發(fā)連接數(shù)select count(*) from v$session where status='ACTIVE';3、查看不同用戶的連接數(shù)select username,count(username) from v$session where username is not null group by username;4、查看所有用戶：select * from all_users;5、查看用戶或角色系統(tǒng)權(quán)限(直接賦值給用戶或角色的系統(tǒng)權(quán)限)：select * from dba_sys_privs;select * from user_sys_privs;6、查看角色(只能查看登陸用戶擁有的角色)所包含的權(quán)限select * from role_sys_privs;7、查看用戶對(duì)象權(quán)限：select * from dba_tab_privs;select * from all_tab_privs;select * from user_tab_privs;8、查看所有角色：select * from dba_roles;9、查看用戶或角色所擁有的角色：select * from dba_role_privs;select * from user_role_privs;10、查看哪些用戶有sysdba或sysoper系統(tǒng)權(quán)限(查詢時(shí)需要相應(yīng)權(quán)限)select * from V$PWFILE_USERS;當(dāng)前連接數(shù)：select count(*) from v$session;最大連接數(shù)：select value from v$parameter where name = 'processes'; ? ? ?修改最大連接數(shù): ? ? ?alter system set processes = 300 scope = spfile; ? ? ?重啟數(shù)據(jù)庫(kù):shutdown immediate;startup;

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