oracle 表空间自己主动扩展大小

select a.FILE_NAME,a.AUTOEXTENSIBLE,a.MAXBYTES,a.INCREMENT_BY from dba_data_files a;

--AUTOEXTENSIBLE 是否自己主动扩展

--MAXBYTES 最大

--INCREMENT_BY 自己主动扩展块数

SQL> show parameter db_block

NAME TYPE VALUE

------------------------------------ ----------- ------------------------------

db_block_buffers integer 0

db_block_checking boolean FALSE

db_block_checksum boolean TRUE

db_block_size integer 8192

--db_block_size*INCREMENT_BY 块大小*块数=自己主动扩展的大小;

例:

create tablespace sq01 datafile 'd:\sq01.bdf' size 5m ; --创建表空间

alter database datafile 'd:\sq01.bdf' autoextend on next 20m maxsize 100m;

--改动表空间自己主动增长每次增长20m最大空间100M

SQL> select a.FILE_NAME,a.AUTOEXTENSIBLE,a.MAXBYTES,a.INCREMENT_BY from dba_data_files a ;

FILE_NAME AUTOEXTENSIBLE MAXBYTES INCREMENT_BY

-------------------------------------------------------------------------------- -------------- ---------- ------------

D:\SQ01.BDF YES 104857600 2560

SQL> show parameter db_block

NAME TYPE VALUE

------------------------------------ ----------- ------------------------------

db_block_buffers integer 0

db_block_checking boolean FALSE

db_block_checksum boolean TRUE

db_block_size integer 8192

SQL> select 2560*8192/1024/1024||'M' from dual;

2560*8192/1024/1024||'M'

------------------------

20M