单选题A consultant has been asked to do a performance analysis on a database server. Which subsystem should the consultant first analyze and why？（）ACPU，because the database replication process requires a considerable amount of CPU timeBMemory，because the buffer cache requires a large amount of memory to maintain the data in system memoryCDisk，because it is important to configure a sufficient number of disks to match the CPU processing powerDNetwork，because the data returned to the client from the server can be a large subset of the total database
单选题
A consultant has been asked to do a performance analysis on a database server. Which subsystem should the consultant first analyze and why？（）
A
CPU，because the database replication process requires a considerable amount of CPU time
B
Memory，because the buffer cache requires a large amount of memory to maintain the data in system memory
C
Disk，because it is important to configure a sufficient number of disks to match the CPU processing power
D
Network，because the data returned to the client from the server can be a large subset of the total database
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