[多选] Which two statements are true regarding undo tablespaces（）

A . The database can have more than one undo tablespace.
B . The UNDO_TABLESPACE parameter is valid in both automatic andmanualundo management.
C . Undo segments automatically grow and shrink as needed， acting as circular storage buffer for their assigned transactions.
D . An undotablespaceis automatically created if the UNDO_TABLESPACEparameter is not set and the UNDO_MANAGEMENT parameter is set to AUTO during the database instance start up.

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参考答案：

● 参考解析

A答案：可以有一个或多个undo表空间，A答案正确。
sys@TEST0924> select TABLESPACE_NAME，CONTENTS from dba_tablespaces； TABLESPACE_NAME CONTENTS ------------------------------ --------- SYSTEM PERMANENT SYSAUX PERMANENT UNDOTBS1 UNDO TEMP TEMPORARY USERS PERMANENT UNDOTBS2 UNDO
EXAMPLE PERMANENT LXTBS PERMANENT FLA_TBS1 PERMANENT FLA_TBS2 PERMANENT 10 rows selected.
B答案：UNDO_TABLESPACE只能用于自动undo段模式，B答案错误

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[多选] Which two statements are true regarding undo tablespaces（）

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