ocp 053 examb 150-end

151.which three functions are perfored by the sql tuning advisor?

a.bulding the sql profile

c.checking query objects for missing and state stastics

e.recommendinmg restructuring sql qurries that are using bad plans

sql tunning advisor recommendations fall into the following categories

statistics analysis

sql profiling 

access path analuysis

sql structure an alsis

162.which options must you configure while perforimg an automated tablespace point-in-time recovery(TSPITR)

by using recovery manager（rman）?

d.auxilary destinations for an auxiliary set of data files

使用auxiliary destination选项制定辅助目标

166.you need to maintain a record of all transations on some tables at least three years 

automatic undo management is eanbled for the database

what must you du accomplish this task、

d.create flash data archive and enable flashback data archive for specific tables

173.在数据库表空间在备份模式时，实例被异常关闭，重新启动会报错，而数据库会在mount状态，必须执行

alter database endback 后才能open

187.c.the progress of the shrink operation is saved in the bitmap block of the booking table 

如果有长时间运行的查询，而且这些查询可能跨越收缩操作，并尝试从已回收的块中读取数据，则compact字句会很有用，制定shrink space compact字句时，收缩操作的进度将会保存在相应段的位图块中，这意味着下次再同一个段上执行收缩操作时，oracledb可以记住已经执行过的操作