1. Which three are true in Oracle 19c and later releases（）?
   A、Simultaneous data pump jobs can be limited at the pluggable database(PDB、level
   B、An ordinary data pup export of a table with encrypted columns will always encrypt thesame columns when imported
   C、Tablespaces always remain in read/write mode during transportable tablespace operations
   D、A transportable data pump import can leave a plugged-in tablespace in read/write mode.
   E、Tablespaces never remain in read/write mode during transportable tablespace operations
   F、A transportable data pump import can leave a plugged-in tablespace in read-only mode

答案:ADF
“This method for transporting tablespaces requires that you place the tablespaces to be transported in read-only mode until you complete the transporting process. If this is undesirable, you can use the transportable tablespaces from backup feature” -> BC correcthttp://www.cndba.cn/hbhe0316/article/108630

MAX_DATAPUMP_JOBS_PER_PDB determines the maximum number of concurrent Oracle Data Pump jobs per PDB. -> D correct

https://docs.oracle.com/en/database/oracle/oracle-database/19/admin/transporting-data.html#GUID-9304426D-9D40-4F0D-8661-F53B608A652Fhttp://www.cndba.cn/hbhe0316/article/108630http://www.cndba.cn/hbhe0316/article/108630http://www.cndba.cn/hbhe0316/article/108630

https://docs.oracle.com/en/database/oracle/oracle-database/19/refrn/MAX_DATAPUMP_JOBS_PER_PDB.html#GUID-E911645F-2CA4-447D-AFB7-EBD4753AA09F

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