題目：html
Examine this parameter:oracle
NAME TYPE VALUEapp
------------------------ ------------- ----------------------------------this
db_create_file_dest string /u01/app/ oracle/ oradata/prod/spa
Now examine this statement which executes successfully in an Oracle Database version 18c or later.htm
CREATETABLESPACE data_olap;string
Which two are true about this tablespace and its attributes?it
A. The datafile has an Oracle generated name.io
B. The initial datafile size is 100MB.table
C. The datafile that is created is not auto extensible.
D. The tablespace is created with manual segment space management.
E. The tablespace is a dictionary managed tablespace.
Answer: AB
【解析】
在19c的版本默認狀況下，用於永久表空間的Oracle託管的數據文件爲100 MB，而且能夠自動擴展且最大大小不受限制。可是，若是在DATAFILE子句中經過指定SIZE值（且沒有AUTOEXTEND子句）覆蓋這些默認值，則數據文件不能自動擴展。
【官方手冊】
https://docs.oracle.com/en/database/oracle/oracle-database/19/admin/using-oracle-managed-files.html#GUID-D5C4F978-E3C9-4DFF-A076-B0FE75065F32