oracle不可更新的试图
关键词：with read only
作用：用于指定所创建的试图不可以通过本视图更新表
执行一下SQL，创建表T，和两个试图V1，V2：
CREATE TABLE T(ID INTEGER);
CREATE VIEW V1 AS SELECT * from T;
CREATE VIEW V2 AS SELECT * from T WITH READ ONLY;
执行SQL:
INSERT INTO V1 VALUES(1);
--------------------
1 row created
执行SQL:
INSERT INTO V2 VALUES(1);
--------------------
提示错误
单独的SELECT语句不能使用WITH READ ONLY
SELECT * from T WITH READ ONLY;
将不能运行。
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Oracle异常分为3种:
(1)预定义异常:no_data_found等,是Oracle系统定义的异常.
declare
s_test varchar2
begin
select id into s_test from test; --此时test表无数据
exception
when no_data_found then
raise_application_error(-20001, '没有数据');
end;
(2)自� ......
--1查看表空间已经使用的百分比
select a.tablespace_name,a.bytes/1024/1024
"Sum MB",(a.bytes-b.bytes)/1024/1024 "used MB",b.bytes/1024/1024
"free MB",round(((a.bytes-b.bytes)/a.bytes)*100,2) "percent_used"
from
(select tablespace_nam ......
1、下载oracle软件
http://www.oracle.com/technology/software/tech/oci/instantclient/index.html
oracle-instantclient-basic-10.2.0.4-1.i386.rpm
oracle-instantclient-sqlplus-10.2.0.4-1.i386.rpm
oracle-instantclient-devel-10.2.0.4-1.i386.rpm
2、安装rpm包
rpm -ivh oracle-instantclient-basic-10.2.0.4 ......
转自：http://hi.baidu.com/dashuaiwang/blog/item/47cc680ec35055c37acbe1f8.html
打开oracle 数据库时出现了错误:
ORA-00313: 无法打开日志组 1 (线程 1) 的成员
ORA-00312: 联机日志 1 线程 1: 'D:\ORACLE\ORADATA\GOCOM\REDO01.LOG'
SQL> connect / as sysdba;
已连接。
SQL> shutdown immediate;
ORA- ......
