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create table users(
userid int primary key,
username varchar2(20),
userpwd  varchar2(20)
);
insert into users values(1,'test','test');
insert into users values(2,'test','test');
insert into users values(3,'test','test');
insert into users values(4,'test','test');
insert i ......

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create sequence innerid
minvalue 1
maxvalue 999999999
start with 1
increment by 1
cache 20
order;
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create table users(
userid int primary key,
username   varchar2(20),
userpwd    varchar2(20)
);
select * from users;
insert into users values( ......

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select tablespace_name, file_name, sum(bytes)/1024/1024 table_size from dba_data_files group by tablespace_name,file_name;
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CREATE TABLESPACE data01 DATAFILE '/oracle/oradata/db/DATA01.dbf' SIZE 500M; 
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DROP TABLESPACE data01 INCLUDING C ......

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