A. issuing the ALTER SYSTEM ENABLE RESUMABLE; statement
B. issuing the ALTER SESSION ENABLE RESUMABLE; statement
C. modifying the RESUMABLE_TIMEOUT initialization parameter to a nonzero value
D. issuing the ALTER SYSTEM SET RESUMABLE_TIMEOUT=<nonzero value>; statement
Answer: CD
参考：http://docs.oracle.com/cd/E11882_01/server.112/e25494/schema.htm#ADMIN11589
You can specify a default system wide timeout interval by setting the RESUMABLE_TIMEOUT initialization parameter. For example, the following setting of the RESUMABLE_TIMEOUT parameter in the initialization parameter file sets the timeout period to 1 hour:
RESUMABLE_TIMEOUT = 3600
If this parameter is set to 0, then resumable space allocation is disabled even for sessions that run an ALTER SESSION ENABLE RESUMABLE statement without a timeout value.
You can also use the ALTER SYSTEM SET statement to change the value of this parameter at the system level. For example, the following statement disables resumable space allocation for all sessions that run an ALTER SESSION ENABLE RESUMABLE statement without a timeout value:
ALTER SYSTEM SET RESUMABLE_TIMEOUT=0;
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