单项选择题 In one of your online transaction processing （OLTP） applications， users are manipulating and querying a database table simultaneously. From the Segment Advisor， you find that one of the tables is highly fragmented and you want to shrink the table immediately without affecting the currently active queries.  Which option would you use with the ALTER TABLE command to achieve this objective？（）

多项选择题 View the Exhibit and examine the properties of the USERS tablespace.     You execute the following statement to shrink the TRANS table existing on the USERS tablespace：  SQL> ALTER TABLE trans SHRINK SPACE CASCADE；  Which objects would be affected by this command？（）

单项选择题 View the Exhibit and examine the properties of the TT tablespace.  Using Database Control， you have scheduled a job to shrink the TRANS table residing on the TT tablespace. The job would run at 5：00 p.m. every Friday.When you examine the space usage of the table after the completion of the job， you find that the table has not been shrunk.  What could have been the reason for this？（）