[单选] A customer has a requirement for Disaster Recovery for compliance within their industry. Theyhave an RPO of 4 hours and an RTO of 24 hours. Cost is a consideration. What is the most costeffective DR implementation？（）

A . a disk-to-disk backup solution keeping all storage in the data center
B . a backup solution that includes magnetic tape that is shipped to an off-site storage facility
C . a less powerful copy environment at a hot site with asynchronous mirroring and cluster technology
D . an exact copy of the primary environment at a hot site with remote mirroring and cluster technology

Given the following RMAN commands，choose the option that reflects the order required to restore your currently operational ARCHIVELOG-mode database.（） a. restore database b. recover database c. shutdown immediate d. startup e. restore archivelog all f. alter database open a， b， c， d， e， f。 c， b， a， d， e， f。 c， b， a， d， f。 c， a， b， d。 c， a， e， b， d， f。高层普通住宅楼的电梯和楼道照明用电，应属于（）级负荷。【背景资料】某工业厂房车间3层，7度抗震设防。高度20m，长度为70m，独立基础，结构形式为砌体承重结构。在建成使用几个月后发现底层局部地面呈锅底形下沉，砼地面脱落、开裂，后来又发生墙体开裂，裂缝呈正八字裂缝和斜向裂缝，裂缝宽度达1mm～2mm，一般分布在底层中下部，且首先在窗对角突破，严重影响了建筑物的使用和工厂面貌，给工厂造成了重大的经济损失。经翻阅资料发现，该仓房实际上处于软弱土层，且为淤泥质土，地勘报告不准确；最终认定是由于地面不均匀沉降造成的危害对于砌体承重结构，控制建筑物的长高比及合理布置纵横墙增强其整体刚度和强度，如控制三层和三层以上房屋的长高比不大于2.5。什么是按绩效付酬为什么说实际工作中按绩效付酬有难度 The DB_BLOCK_CHECKING initialization parameter is set to TRUE. What would be the result of this setting on the data blocks being written to the datafiles， every time the DBWn writes？（） The Oracle database will check all data blocks by going through the data on each block， making sure the data is self-consistent.。 DBWn and the direct loader will calculate a checksum and store it in the cache header of every data block when writing it to disk.。 The Oracle database will check data blocks belonging to the SYSTEM tablespace only， by going through the data on each block， making sure the data is self-consistent.。 The Oracle database will check data blocks belonging to the SYSAUX tablespace only， by going through the data on each block， making sure the data is self-consistent.。 The Oracle database will check data blocks in the SYSTEM and SYSAUX tablespaces only， by going through the data on each block， making sure the data is self-consistent。 A customer has a requirement for Disaster Recovery for compliance within their industry. Theyhave an RPO of 4 hours and an RTO of 24 hours. Cost is a consideration. What is the most costeffective DR implementation？（）

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[单选] A customer has a requirement for Disaster Recovery for compliance within their industry. Theyhave an RPO of 4 hours and an RTO of 24 hours. Cost is a consideration. What is the most costeffective DR implementation？（）

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