oracle 常用操作

Posted 2020-11-20 echo>>log

1.查看表空间使用信息

SELECT a.tablespace_name "表空间名", 

total "表空间大小",
free "表空间剩余大小",
(total - free) "表空间使用大小",
total / (1024 * 1024 * 1024) "表空间大小(G)",
free / (1024 * 1024 * 1024) "表空间剩余大小(G)",
(total - free) / (1024 * 1024 * 1024) "表空间使用大小(G)",
round((total - free) / total, 4) * 100 "使用率 %"
FROM (SELECT tablespace_name, SUM(bytes) free
FROM dba_free_space
GROUP BY tablespace_name) a,
(SELECT tablespace_name, SUM(bytes) total
FROM dba_data_files
GROUP BY tablespace_name) b
WHERE a.tablespace_name = b.tablespace_name;

2.查看表空间是否具有自动扩展的能力

SELECT T.TABLESPACE_NAME,D.FILE_NAME,
D.AUTOEXTENSIBLE,D.BYTES,D.MAXBYTES,D.STATUS
FROM DBA_TABLESPACES T,DBA_DATA_FILES D
WHERE T.TABLESPACE_NAME =D.TABLESPACE_NAME
ORDER BY TABLESPACE_NAME,FILE_NAME;

3.扩展表空间操作

(1) 给表空间增加数据文件

ALTER TABLESPACE app_data ADD DATAFILE
‘D:ORACLEPRODUCT10.2.0ORADATAEDWTESTAPP03.DBF‘ SIZE 50M;

(2)新增数据文件，并且允许数据文件自动增长

ALTER TABLESPACE app_data ADD DATAFILE
‘D:ORACLEPRODUCT10.2.0ORADATAEDWTESTAPP04.DBF‘ SIZE 50M
AUTOEXTEND ON NEXT 5M MAXSIZE 100M;

(3)允许已存在的数据文件自动增长

ALTER DATABASE DATAFILE ‘D:ORACLEPRODUCT10.2.0ORADATAEDWTESTAPP03.DBF‘
AUTOEXTEND ON NEXT 5M MAXSIZE 100M;

(4)手工改变已存在数据文件的大小

DATAFILE ‘D:ORACLEPRODUCT10.2.0ORADATAEDWTESTAPP02.DBF‘
RESIZE 100M;