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问题:

[多选] Which statements are true regarding table compression? ()(Choose all that apply.)

A . It saves disk space and reduces memory usage.
B . It saves disk space but has no effect on memory usage.
C . It incurs extra CPU overhead during DML as well as direct loading operations.
D . It incurs extra CPU overhead during DML but not direct loading operations.
E . It requires uncompress operation during I/O.

You work as a database administrator for Supportcenter.cn. Because of space constraints, you decided to manually shrink the table. You executed the ALTER TABLE ....SHRINK SPACE statement to shrink the space and you receive an error as follows:   ERROR at Line 1:   ORA-10635: Invalid segment or tablespace type   What could be the reason? () The table is partitioned。 The table name is wrong.。 It is an index-Organized table (IOT)。 The table is stored in locally managedtablespace.。 The table is stored in atablespacewhere segment space is managed manually.。 下面哪个不是常用的网络管理方式() SNMP。 RMON。 WEB。 FTP。 一份好的商业计划应符合哪些要求? You executed the following command in Recovery Manager (RMAN):  RMAN> RESTORE CONTROLFILE;  Which operation must you perform before this command is executed?()  back up the control file to trace。 bring database to the MOUNT state。 open a connection to the RMAN recovery catalog, which contains the RMAN metadata for the target database。 set the database ID (DBID), but only if the DB_NAME parameter associated with the target database is unique in the recovery catalog。 假山洞结构形式一般分为 Which statements are true regarding table compression? ()(Choose all that apply.)
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