--1、查看錶空間的名稱及大小
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、查看錶空間物理文件的名稱及大小
SELECT tablespace_name,
file_id,
file_name,
round(bytes / (1024 1024), 0) total_space
FROM dba_data_files
ORDER BY tablespace_name;
--3、查看回滾段名稱及大小
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$rollstat v
WHERE r.segment_id = v.usn(+)
ORDER BY segment_name;
--4、查看控制文件
SELECT NAME FROM v$controlfile;
--5、查看日誌文件
SELECT MEMBER FROM v$logfile;
--6、查看錶空間的使用情況
SELECT SUM(bytes) / (1024 1024) AS free_space, tablespace_name
FROM dba_free_space
GROUP BY tablespace_name;
SELECT a.tablespace_name,
a.bytes total,
b.bytes used,
c.bytes free,
(b.bytes 100) / a.bytes "% USED ",
(c.bytes 100) / a.bytes "% FREE "
FROM sys.sm$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;
--7、查看數據庫庫對象
SELECT owner, object_type, status, COUNT() count#
FROM all_objects
GROUP BY owner, object_type, status;
--8、查看數據庫的版本
SELECT version
FROM product_component_version
WHERE substr(product, 1, 6) = 'Oracle';
--9、查看數據庫的創建日期和歸檔方式
SELECT created, log_mode, log_mode FROM v$database;
--10、建立表空間：
CREATE TABLESPACE "DATA" DATAFILE 'D:\ORADATA\ORCL\DATA01.DBF' SIZE 2048M ;
表空間增加數據文件：
ALTER TABLESPACE "DATA" ADD DATAFILE 'D:\ORADATA\ORCL\DATA02.DBF' SIZE 2048M ;
ALTER TABLESPACE "USERS" ADD DATAFILE 'D:\OraData\Orcl\USERS11.DBF' SIZE 2048M ;