oracle实用操作

1、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; 

2、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; 

3、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; 

4、查看数据库对象

SELECT owner, object_type, status, COUNT(*) count# 
FROM all_objects 
GROUP BY owner, object_type, status; 

5、查看数据库的版本

SELECT version 
FROM product_component_version 
WHERE substr(product, 1, 6) = 'Oracle'; 

6.创建表空间

create tablespace  HZZAFK datafile 'E:\fwwork\springbootTemplate\HZZAFK' size 512M autoextend on next 32M;

7.删除用户

drop user HZZAFK cascade;

8.在指定表空间下创建用户

CREATE USER HZZAFK  IDENTIFIED BY HZZAFK DEFAULT TABLESPACE HZZAFK;

9.用户授权

grant connect, resource, dba to HZZAFK

10.判断是否有某个表

select count(*) from user_tables where upper(table_name) = upper('表名')