最近常用的Oracle的SQL

--查看所有用户
select * from dba_users d order by d.username

--查看所有表空间
select tablespace_name  from user_tablespaces;

--查看用户下所有的表
select * from user_tables;

--查询当前用户的表空间名称
 select default_tablespace from dba_users where username='jeesite'

--删除用户
drop user jeesite cascade

--删除表空间
DROP TABLESPACE JEESITE_DATA INCLUDING CONTENTS AND DATAFILES;

--建立表空间
create tablespace jeesite_data
logging
datafile 'C:\APP\ADMINISTRATOR\ORADATA\ORCL\JEESITE_DATA.DBF' 
size 1024m
autoextend on
next 1024m 
extent management local;

--建立用户、授权

create user jeesite
	identified by jeesite
	quota unlimited on users;
  
grant connect,resource,create session,select any table,
		create any view,create any table,create any index,
		drop any table,drop any view,drop any index
	to jeesite;
	
-- 提示 oracle.jdbc.xa.OracleXAResource.recover 错误需要授权：
grant select on sys.dba_pending_transactions to jeesite;
grant select on sys.pending_trans$ to jeesite;
grant select on sys.dba_2pc_pending to jeesite;
grant execute on sys.dbms_system to jeesite;


--修改用户默认表空间
alter database default tablespace jeesite_data

--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; 

--6、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; 

--导入数据日期格式错误（原因是中文环境）
SELECT * FROM v$parameter WHERE name = 'nls_date_language';

ALTER SESSION SET NLS_DATE_LANGUAGE='AMERICAN';