oracle查看对象信息

1.查看某用户下所有对象的信息：

SELECT owner, object_type, status, COUNT(*) count# 
FROM all_objects 
where owner='xxx'
GROUP BY owner, object_type, status
order by 2; 

2.查看表行数（多个表）（需先分析表）：

select 'analyze table '|| table_name||' compute statistics;' from  user_tables;

select table_name,num_rows from dba_tables where owner='WEBAGENT' order by 1;

select count(*) from WITHDRAWAL_ORG;

3.查看表空间大小：

SELECT t.tablespace_name, round(SUM(bytes / (1024 * 1024*1024)), 0) ts_size_GB
FROM dba_tablespaces t, dba_data_files d 
WHERE t.tablespace_name = d.tablespace_name 
GROUP BY t.tablespace_name; 

4.查看表空间的使用情况：

SELECT tablespace_name ,SUM(bytes) / (1024 * 1024) AS free_space_MG
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;

5.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*1024), 0) total_space 
FROM dba_data_files 
ORDER BY tablespace_name;

6.查正在执行的sql和执行过的sql:

　　a.查询正在执行的sql

select a.username, a.sid,b.SQL_TEXT, b.SQL_FULLTEXT
  from v$session a, v$sqlarea b 
where a.sql_address = b.address;

　　b.查询指定时间内执行过的sql

select b.SQL_TEXT,b.FIRST_LOAD_TIME,b.SQL_FULLTEXT
  from v$sqlarea b
where b.FIRST_LOAD_TIME between '2009-10-15/09:24:47' and
       '2009-10-15/09:24:47' order by b.FIRST_LOAD_TIME 

7.回收站：

drop table t1 purge;
purge recyclebin;

8.监控oracle的等待事件：

select event,
       sum(decode(wait_Time, 0, 0, 1)) "Prev",
       sum(decode(wait_Time, 0, 1, 0)) "Curr",
       count(*) "Tot"
  from v$session_Wait
 group by event
 order by 4;

9.统计模式内的对象信息：

　　a.查看当前schema的对象信息

select object_type,count(*) from user_objects group by object_type;

　　b.sys用户下查看指定schema的对象信息

select SEGMENT_TYPE，COUNT(*) from dba_segments where tablespace_name='TSP_WEBAGENT'  GROUP BY SEGMENT_TYPE;