1. Which two are true about creating pluggable databases(PDBS)in Oracle 19c and later releases（）?
   A、A PDB snapshot depends on an existing storage snapshot of the source PDB
   B、A PDB snapshot can be a full copy of a source PDB
   C、A PDB snapshot can be a sparse copy of a source PDB
   D、A snapshot copy PDB does not depend on an existing storage snapshot of the source PDB
   E、A snapshot copy PDB can be a full copy of a source PDB

答案:BChttp://www.cndba.cn/hbhe0316/article/108628http://www.cndba.cn/hbhe0316/article/108628http://www.cndba.cn/hbhe0316/article/108628

A PDB snapshot is a point-in-time copy of a PDB. The source PDB can be open read-only or read/write while the snapshot is created. You can create snapshots manually using the SNAPSHOT clause of CREATE PLUGGABLE DATABASE (or ALTER PLUGGABLE DATABASE), or automatically using the EVERY interval clause. If the storage system supports sparse clones, then the preceding command creates a sparse copy. Otherwise, the command creates a full copy.
So, A and B are false from my point of view.http://www.cndba.cn/hbhe0316/article/108628http://www.cndba.cn/hbhe0316/article/108628http://www.cndba.cn/hbhe0316/article/108628http://www.cndba.cn/hbhe0316/article/108628

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