145. Examine the commands executed in a DBA session:
SQL> CREATE BIGFILE TABLESPACE MRKT
2 DATAFILE '/u01/app/oracle/oradata/orcl/mrkt.dbf' size 10M LOGGING
3 EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO;
Tablespace created.
SQL> ALTER DATABASE DEFAULT TABLESPACE MRKT;
Database altered.
Which two statements are true regarding the MRKT tablespace? (Choose two.)
A.No more data files can be added to the tablespace.
B.Segment space is managed by free lists in the tablespace.
C.A user created without being assigned a default tablespace uses this tablespace.
D.The tablespace can be dropped with the current setting with segments present in it.
Answer: AC
答案解析：
1、BIGFILE只能有一个数据文件。A对
2、ALTER DATABASE DEFAULT TABLESPACE MRKT;设置默认表空间，以后用户创建的数据都会放在这个表空间里。C对。
3、创建BIGFILE时，oracle自动创建本地管理表空间和自动段空间管理（ASSM）。B错
Oracle Database automatically creates a locally managed tablespace with automatic segment space management.
4、正在使用的默认表空间不能被drop。 D错。
实验验证：
sys@TEST1107> alter database default tablespace TESTTBS;
Database altered.
sys@TEST1107> select PROPERTY_NAME,PROPERTY_VALUE from database_properties;
PROPERTY_NAME PROPERTY_VALUE
------------------------------ --------------------------------------------------
DICT.BASE 2
DEFAULT_TEMP_TABLESPACE TEMP
DEFAULT_PERMANENT_TABLESPACE TESTTBS
DEFAULT_EDITION ORA$BASE
Flashback Timestamp TimeZone GMT
TDE_MASTER_KEY_ID
DST_UPGRADE_STATE NONE
DST_PRIMARY_TT_VERSION 14
DST_SECONDARY_TT_VERSION 0
DEFAULT_TBS_TYPE SMALLFILE
NLS_LANGUAGE AMERICAN
NLS_TERRITORY AMERICA
NLS_CURRENCY $
NLS_ISO_CURRENCY AMERICA
NLS_NUMERIC_CHARACTERS .,
NLS_CHARACTERSET AL32UTF8
NLS_CALENDAR GREGORIAN
NLS_DATE_FORMAT DD-MON-RR
NLS_DATE_LANGUAGE AMERICAN
NLS_SORT BINARY
NLS_TIME_FORMAT HH.MI.SSXFF AM
NLS_TIMESTAMP_FORMAT DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT HH.MI.SSXFF AM TZR
NLS_TIMESTAMP_TZ_FORMAT DD-MON-RR HH.MI.SSXFF AM TZR
NLS_DUAL_CURRENCY $
NLS_COMP BINARY
NLS_LENGTH_SEMANTICS BYTE
NLS_NCHAR_CONV_EXCP FALSE
NLS_NCHAR_CHARACTERSET AL16UTF16
NLS_RDBMS_VERSION 11.2.0.3.0
GLOBAL_DB_NAME TEST1107
EXPORT_VIEWS_VERSION 8
WORKLOAD_CAPTURE_MODE
WORKLOAD_REPLAY_MODE
NO_USERID_VERIFIER_SALT 75282D7EC73B5C40AFF387B2BF5692A0
DBTIMEZONE 00:00
36 rows selected.
sys@TEST1107> drop tablespace TESTTBS;
drop tablespace TESTTBS
*
ERROR at line 1:
ORA-12919: Can not drop the default permanent tablespace
reating a Bigfile Tablespace
To create a bigfile tablespace, specify the BIGFILE keyword of the CREATE TABLESPACE statement (CREATE BIGFILE TABLESPACE ...). Oracle
Database automatically creates a locally managed tablespace with automatic segment space management. You can, but need not, specify EXTENT MANAGEMENT LOCAL and SEGMENT SPACEMANAGEMENT AUTO in
this statement. However, the database returns an error if you specify EXTENT MANAGEMENT DICTIONARY or SEGMENT SPACE MANAGEMENT MANUAL.
The remaining syntax of the statement is the same as for the CREATE TABLESPACE statement, but you can only specify one data file. For
example:
You can specify SIZE in kilobytes (K), megabytes (M), gigabytes (G), or terabytes (T).
If the default tablespace type was set to BIGFILE at database creation, you need not specify the keyword BIGFILE in the CREATE TABLESPACE statement. A bigfile tablespace is created by default.
If the default tablespace type was set to BIGFILE at database creation, but you want to create a traditional (smallfile) tablespace, then specify a CREATESMALLFILE TABLESPACE statement
to override the default tablespace type for the tablespace that you are creating.
官方参考：http://docs.oracle.com/cd/E11882_01/server.112/e25494/tspaces.htm#sthref1527