Oracle OCP 19c 认证1Z0-083考试(第23题)

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Examine this output:

Which two are true? (Choose two.)

• A. Any PDB not specified in the plan will be unable to execute statements in parallel.
• B. PDB3 can use all available parallel execution processes at times.
• C. PDB1 is always limited to 40% of the available system resources regardless of demand.
• D. Any PDB not specified in the plan will be able to use a maximum of 16.5% of the available system resources.
• E. PDB3 is guaranteed to receive at least 20% of the available system resources if there is enough demand.
• F. PDB2 is guaranteed at least 25% of the available parallel execution processes if there is enough demand.

AB

A. Correct as then a PDB will get assigned the default directive with parallel_server_limit set to 0
B. Correct as parallel_server_limit is not specified for PDB3 and it defaults to 100

Quote:

https://docs.oracle.com/database/121/ADMIN/dbrm.htm#ADMIN14008

"If PARALLEL_SERVER_LIMIT is not specified, then it defaults to 100%."

C. Incorrect. A PDB can use more resources:

Quote from

https://docs.oracle.com/database/121/ADMIN/cdb_dbrm.htm#ADMIN13777

"However, any PDB can use more than the guaranteed amount of a resource if there is no resource contention."

D. Incorrect. Shares is a minimum guaranteed value. But a PDB can use more as explained above in C.
E. Incorrect. Nothing confirms that there are only 3 PDBs attached. There may be others using the default pdb directive. Then the share for PDB2 is not 20%
F. Incorrect. parallel_server_limit is an upper limit.

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