oracle 自动增长列 例子
--创建序列
create sequence innerid
minvalue 1
maxvalue 999999999
start with 1
increment by 1
cache 20
order;
--创建表
create table users(
userid int primary key,
username varchar2(20),
userpwd varchar2(20)
);
select * from users;
insert into users values(innerid.nextval,'zhangsan','123');
insert into users values(innerid.nextval,'lisi','123');
insert into users values(innerid.nextval,'wangwu','123');
--创建触发器
create or replace trigger users_id
before insert on users for each row
begin
select innerid.nextval into :new.userid from dual;
end users_id;
insert into users(username,userpwd) values('zhaoliu','123');
select * from users;
commit;
相关文档：
--创建用户
create user iagent identified by ia
--profile default
default tablespace users
temporary tablespace temp;
--account unlock;
--删除用户
drop user iagent cascade;
--修改用户密码
alter user iagent identified by ia;
--给创建� ......
select owner,sum(bytes)/1024/1024 sum_MB
from dba_segments
where tablespace_name='USERS' and owner like 'ZJ%'
group by owner
order by 2 desc;
SET NEWPAGE NONE HEADING OFF SPACE 0 PAGESIZE 0 TRIMOUT ON TRIMSPOOL ON LINESIZE 25 ......
--设置密码法过期
alter profile default limit PASSWORD_LIFE_TIME unlimited;
alter profile default limit FAILED_LOGIN_ATTEMPTS unlimited;
--取消审计
alter system set audit_trail='FALSE' scope=spfile;
--定义连接数据库的最大进程数
alter system set processes=1024 scope=spfile;
--关闭垃圾回收站
al ......
connect by 是结构化查询中用到的，其基本语法是：
select ... from tablename start with 条件1
connect by 条件2
where 条件3;
例：
select * from table
start with org_id = 'HBHqfWGWPy'
connect by prior org_id = parent_id;
简单说来是将一个树状结构存储在一张表里，比如一个表中存在两个字段:
......
Q]如何开启/关闭归档
Q]如何开启/关闭归档
[A]如果开启归档，请保证log_archive_start=true开启自动归档，否则只能手工归档，如果是关闭了归档，则设置该参数为false
注意：如果是OPS/RAC环境，需要先把parallel_server = true注释掉，然后执行如下步骤，最后用这个参数重新启动
1、开启归档
a. 关闭数据库shutdown im ......
