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单选题
Flushing dirty buffers out of the buffer cache is influenced to the greatest extent by which of the following process?()
A

ARCH 

B

SMON 

C

LGWR

D

SERVER


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考题 Which is the correct description of a pinned buffer in the database buffer cache()A、The buffer is currently being accessed.B、The buffer is empty and has not been used.C、The contents of the buffer have changed and must be flushed to the disk by the DBWn process. D、The buffer is a candidate for immediate aging out and its contents are synchronized with the block contents on the disk.

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考题 多选题Which two statements about the background process of the database writer are true()AIt is possible to have multiple database writers in an Oracle instance.BIt writes dirty buffers, if any, to data files whenever a checkpoint occurs.CIt writes dirty buffers, if any, to data files whenever a transaction commits.DIt writes dirty buffers, if any, to data files before the log writer (LGWR) writes

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考题 多选题Which three statements are true about memory buffer allocation by a MySQL Server?()AGlobal buffers such as the InnoDB buffer pool are allocated after the server starts, and are never freedBThread buffers are allocated when a client connects, and are freed when the client disconnectsCBuffers that are needed for certain operation are allocated when the operation starts, and freed when it endsDUser buffers are allocated at server startup and freed when the user is droppedEAll dynamic buffers that are set with a SET GLOBAL statement immediately get allocated globally, and are never freed

考题 单选题Automatic Shared Memory Management (ASMM) has been enabled for your database instance.  Theinitialization parameters for the components that are managed by ASMM are not set. After observing theeffects of ASSM, you executed the following command: SQL ALTER SYSTEM SET DB_CACHE_SIZE = 100M;  Which statement is true in this scenario()A The minimum memory size for the database buffer cache is set to 100 mb.B The maximum memory size that can be obtained by the database buffer cache during ASMM is set to100 mbC The minimum memory size allocated for a server process in the database buffer cache in dedicatedmode is set to 100 mb.D The maximum memory size from the database buffer cache that can be released for dynamicdistribution during ASMM is set to 100 mb

考题 单选题Which component of the SGA stores parsed SQL statements is used for process sharing?()A Buffer cache B Redo log buffer C Private SQL area D Library cache E Row cache 

考题 单选题Flushing dirty buffers out of the buffer cache is influenced to the greatest extent by which of the following process?()A ARCH B SMON C LGWRD SERVER

考题 单选题Which background process is responsible for writing the dirty buffers from the write list to the data files during a checkpoint?()A CKPTB SMONC LGWRD DBWnE ARCn

考题 单选题Before the sludge in a purifier is ejected,()A the oil feeding is stopped and replaced by admitting flushing waterB the flushing water feeding is stopped and replaced by admitting oilC the feeding of dirty oil and flushing water is stoppedD the feeding of dirty oil and flushing water is admitted