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如何增加buffer cache的命中率？
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更多 “ 如何增加buffer cache的命中率？ ” 相关考题
考题
An application accesses a small lookup table frequently. You notice that the required data blocks are getting aged out of the default buffer cache.How would you guarantee that the blocks for the table never age out?（）A. Configure the KEEP buffer pool and alter the table with the corresponding storage clause.B. Increase the database buffer cache size.C. Configure the RECYCLE buffer pool and alter the table with the corresponding storage clause.D. Configure Automata Shared Memory Management.E. Configure Automatic Memory Management
考题
以下关于Cache的叙述中，正确的是()。A.Cache的设计目标是容量尽可能与主存容量相等
B.在容量确定的情况下，替换算法的时间复杂度是影响Cache命中率的关键因素
C.Cache的设计思想是在合理成本下提高命中率
D.CPU中的Cache容量应大于CPU之外的Cache容量
考题
以下关于Cache的叙述中，正确的是（ ）。A.在容量确定的情况下，替换算法的时间复杂度是影响Cache命中率的关键因素
B.Cache的设计思想是在合理的成本下提高命中率
C.Cache的设计目标是容量尽可能与主存容量相等
D.CPU中的Cache容量应大于CPU之外的Cache容量
考题
Cache的容量对命中率的影响，以下说法正确的是（）。A、Cache容量越大，命中率增加的越大。B、Cache容量很小时，命中率随容量的增加不太明显。C、当Cache容量由很小开始增加时命中率增加的比较明显，当容量达到一定程度，容量增加命中率改善的并不大。D、Cache容量越大，命中率增加的越小。
考题
在关于主存与cache地址映射方式中，叙述（）是正确的。A、全相联映射方式适用于大容量cacheB、直接映射是一对一的映射关系，组相联映射是多对一的映射关系C、在cache容量相等条件下，直接映射方式的命中率比组相联方式有更高的命中率D、在cache容量相等条件下，组相联方式的命中率比直接映射方式有更高的命中率
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.
考题
You observe that database performance has degraded over a period of time. While investigating the reason， you find that the size of the database buffer cache is not large enough to cache all the needed data blocks. Which advisory component would you refer to， in order to determine the required size of the database buffer cache？（） A、Memory AdvisorB、Segment AdvisorC、SQL Tuning AdvisorD、SQL Access AdvisorE、Automatic Database Diagnostic Monitor （ADDM）
考题
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
Records from the data dictionary information are stored in which of the following database memory areas?（）A、Library cache B、Row cache C、Session UGA D、Buffer cache
考题
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Cache的容量对命中率的影响，以下说法正确的是（）。A
Cache容量越大，命中率增加的越大。B
Cache容量很小时，命中率随容量的增加不太明显。C
当Cache容量由很小开始增加时命中率增加的比较明显，当容量达到一定程度，容量增加命中率改善的并不大。D
Cache容量越大，命中率增加的越小。
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.
考题
单选题An application accesses a small lookup table frequently. You notice that the required data blocks are getting aged out of the default buffer cache. How would you guarantee that the blocks for the table never age out?（）A
Configure the KEEP buffer pool and alter the table with the corresponding storage clause.B
Increase the database buffer cache size.C
Configure the RECYCLE buffer pool and alter the table with the corresponding storage clause.D
Configure Automata Shared Memory Management.E
Configure Automatic Memory Management
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