多项选择题
A. The metadata used to track extents in SGA is reduced.
B. Rebalance operations are completed faster than with a fixed extent size
C. An ASM Instance automatically allocates an appropriate extent size.
D. Resync operations are completed faster when a disk comes online after being taken offline.
E. Performance improves in a stretch cluster configuration by reading from a local copy of an extent.
多项选择题 You create a new pluggable database, HR_PDB, from the seed database. Which three tablespaces arecreated by default in HR_PDB?（）
多项选择题 Which three statements are true about adaptive SQL plan management?（）
单项选择题 Examine the parameter for your database instance: You generated the execution plan for the following query in the plan table and noticed that the nested loop join was done. After actual execution of the query, you notice that the hash join was done in the execution plan: Identify the reason why the optimizer chose different execution plans.（）