[每日一题] 11gOCP 1z0-052 :2013-09-20 BIGFILE | SMALLFILE TABLESPACE.....................B43
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正确答案:AC
创建表空间语法,自来官方文档:
其中SMALLFILE是Oracle 10g新增的特性。从Oracle 10g开始,Oracle推出了大文件表空间BIGFILE TABLESPACE,简称BFT,相对地也有了小文件表空间SMALL TABLESPACE ,简称SFT。
BIGFILE| SMALLFILE
Use this clause to determine whether the tablespace is a bigfileor smallfile tablespace. This clause overrides any default tablespace typesetting for the database.
A bigfiletablespace containsonly one datafile or tempfile, which can contain up to approximately 4 billion(232) blocks. The maximum size of the single datafile or tempfile is128 terabytes (TB) for a tablespace with 32K blocks and 32TB for a tablespacewith 8K blocks.
A smallfiletablespace is atraditional Oracle tablespace, which can contain 1022 datafiles or tempfiles,each of which can contain up to approximately 4 million (222)blocks.
If you omit this clause,then Oracle Database uses the current default tablespace type of permanent ortemporary tablespace set for the database. If you specify BIGFILE
for a permanent tablespace, then the database by default creates alocally managed tablespace with automatic segment-space management.
大文件表空间只能包含一个文件,但是这个文件最大可以达到4GB个数据块大小,按照Oracle通常支持的不同数据块大小(2k/4k/8k/16k/32k),最小的大文件表空间单个文件大小可达8TB,最大可以达到128TB, 当然具体单个文件能够达到的大小还受到OS的限制。
数据库默认的表空间类型是SFT,如下查询可知,所以默认创建的表空间都是小文件表空间。
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