1.檢視所有使用者：select * from dba_user(all_users,user_users);
2.檢視使用者系統許可權：select * from dba_sys_privs(all_sys_privs,user_sys_privs);
3.檢視使用者物件許可權：select * from dba_tab_privs(all_tab_privs,user_tab_privs);
4.檢視所有角色：select * from dba_roles;
5.檢視使用者所擁有的角色：select * from dba_role_privs(user_role_privs);
6.查詢oracle中所有使用者資訊：select * from dba_user;
7.只查詢使用者和密碼：select username,password from dba_users;
8.查詢當前使用者資訊：select * from dba_ustats;
9.查詢使用者可以訪問的視**本：select * from dba_varrays;
10.查詢資料庫中所有檢視的文字：select * from dba_views;
11.查詢全部索引：select * from user_indexes;
12.查詢全部**：select * from user_tables;
13.查詢全部約束：select * from user_constraints;
14.查詢全部物件：select * from user_objects;
15.檢視相關程序在資料庫中的會話
select a.sid,a.serial#,a.program, a.status,
substr(a.machine,1,20), a.terminal,b.spid
from v$session a, v$process b
where a.paddr=b.addr
and b.spid = &spid;
16.檢視資料庫中被鎖住的物件和相關會話
select a.sid,a.serial#,a.username,a.program,
c.owner, c.object_name
from v$session a, v$locked_object b, all_objects c
where a.sid=b.session_id and
c.object_id = b.object_id;
17.檢視相關會話正在執行的sql
select sql_text from v$sqlarea where address =
( select sql_address from v$session where sid = &sid );
18.檢視消耗資源最多的sql
select hash_value, executions, buffer_gets, disk_reads, parse_calls
from v$sqlarea
where buffer_gets > 10000000or disk_reads > 1000000
orderby buffer_gets + 100 * disk_reads desc;
19.檢視某條sql語句的資源消耗：
select hash_value, buffer_gets, disk_reads, executions, parse_calls
from v$sqlarea
where hash_value = 228801498and address = hextoraw('cbd8e4b0');
20.查詢sql語句的動態執行計畫:
首先使用下面的語句找到語句的在執行計畫中的address和hash_code
select sql_text, address, hash_value from v$sql t where (sql_text like '%function_t(表名大寫!)%')
然後:
select operation, options, object_name, cost from v$sql_plan
where address = 'c00000016bd6d248' and hash_value = 664376056;
21.查詢oracle的版本:
select * from v$version;
22.查詢資料庫的一些引數:
select * from v$parameter
23.查詢你的session資訊
select sid, osuser, username, machine, process
from v$session where audsid = userenv('sessionid');
24.當machine已知的情況下查詢session
select sid, osuser, username, machine, terminal
from v$session
where terminal = 'pts/tl' and machine = 'rgmdbs1';
25.查詢當前被某個指定session正在執行的sql語句。假設sessionid為100
select b.sql_text
from v$session a,v$sqlarea b
where a.sql_hashvalue=b.hash_value and a.sid=100
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