select * from DBA_DATAPUMP_JOBS;select job_name,state from dba_datapump_jobs;select * from DBA_DATAPUMP_SESSIONS;-- 查看当前连接到数据库的用户select distinct username from v$session where username is not null group by username;-- 查看当前数据库版本select * from v$version-- 查看所有表select * from user_tablesselect serial#, sid from v$session;-- 显示用户信息(所属表空间)select distinct default_tablespace,temporary_tablespace from dba_users-- 查询oracle的连接数select count(*) from v$session;-- 查询oracle的并发连接数select count(*) from v$session where status='ACTIVE';-- 查看不同用户的连接数select username,count(username) from v$session where username is not null group by username;-- 查看所有用户:select * from all_users;-- 查看用户或角色系统权限(直接赋值给用户或角色的系统权限):select * from dba_sys_privs;select * from user_sys_privs;-- 查看角色(只能查看登陆用户拥有的角色)所包含的权限select * from role_sys_privs;-- 查看用户对象权限:select * from dba_tab_privs;select * from all_tab_privs;select * from user_tab_privs;-- 查看所有角色:select * from dba_roles;-- 查看用户或角色所拥有的角色:select * from dba_role_privs;select * from user_role_privs;-- 查看哪些用户有sysdba或sysoper系统权限(查询时需要相应权限)select * from V$PWFILE_USERS;-- 查看表空间的名称及大小 SELECT t.tablespace_name, round(SUM(bytes / (1024 * 1024)), 0) ts_size FROM dba_tablespaces t, dba_data_files d WHERE t.tablespace_name = d.tablespace_name GROUP BY t.tablespace_name;-- 查看表空间物理文件的名称及大小 SELECT tablespace_name, file_id, file_name, round(bytes / (1024 * 1024), 0) total_space FROM dba_data_files ORDER BY tablespace_name;-- 查看回滚段名称及大小 SELECT segment_name, tablespace_name, r.status, (initial_extent / 1024) initialextent, (next_extent / 1024) nextextent, max_extents, v.curext curextent FROM dba_rollback_segs r, v$rollstat v WHERE r.segment_id = v.usn(+) ORDER BY segment_name;-- 查看控制文件 SELECT NAME FROM v$controlfile;-- 查看日志文件 SELECT MEMBER FROM v$logfile;-- 查看表空间的使用情况 SELECT SUM(bytes) / (1024 * 1024) AS free_space, tablespace_name FROM dba_free_space GROUP BY tablespace_name; SELECT a.tablespace_name, a.bytes total, b.bytes used, c.bytes free, (b.bytes * 100) / a.bytes "% USED ", (c.bytes * 100) / a.bytes "% FREE " FROM sys.sm$ts_avail a, sys.sm$ts_used b, sys.sm$ts_free c WHERE a.tablespace_name = b.tablespace_name AND a.tablespace_name = c.tablespace_name;-- 查看数据库库对象 SELECT owner, object_type, status, COUNT(*) count# FROM all_objects GROUP BY owner, object_type, status;-- 查看数据库的版本 SELECT version FROM product_component_version WHERE substr(product, 1, 6) = 'Oracle';-- 查看数据库的创建日期和归档方式 SELECT created, log_mode, log_mode FROM v$database;