关于使用SQL * Loader的哪两个陈述是正确的？ 它可以使用相同的level语句将数据加载到多个表中。 它可以在指定的列中生成唯一的顺序键值。 Oracle哪个进程用于触发告警?MMON 您的多租户容器数据库(CDB)包含可插入的数据库(PDBs)，您连接到HR_PDB。执行以下命令: SQL > CREATE UNDO TABLESPACE undotbs01 DATAFILE '/u01/oracle/rddb1/undotbs01.dbf' SIZE 60M AUTOEXTEND ON;结果是如何？ 它成功执行并在HR_PDB中创建一个UNDO表空间。？？ Interesting behavior in 12.1.0.1 DB of creating an undo tablespace in a PDB. With the new Multitenant architecture the undo tablespace resides at the CDB level and PDBs all share the same UNDO tablespace. When the current container is a PDB, an attempt to create an undo tablespace fails without returning an error. It executes successfully but neither tablespace nor the data file is created.