【单选题】飞机着陆接地前机头有自动下俯的趋势,原因描述错误是 。
【单选题】根据抽样调查得知:甲企业一等品产品比重为30%,乙企业一等品比重为50%,一等品产品比重的抽样平均误差为 ( )
【多选题】You use the segment advisor to help determine objects for which space may be reclaimed. Which three statements are true about the advisor given by the segment advisor?()
A.
It may advise the use of online table redefinition for tables in dictionary managed tablespace.
B.
It may advise the use of segment shrink for tables in dictionary managed tablespaces it the no chained rows.
C.
It may advise the use of online table redefinition for tables in locally managed tablespaces
D.
It will detect and advise about chained rows.
E.
It may advise the use of segment shrink for free list managed tables.
【简答题】School Careers Advisor
【单选题】Which statement most accurately describes the implementation of a SQL Access Advisor recommendation?()
A.
SQL Access Advisor recommendations are automatically implemented.
B.
Individual SQL Access Advisor recommendations can be scheduled for implementation.
C.
All SQL Access Advisor recommendations for a specific task must be implemented at the same time.
D.
SQL Access Advisor recommendations are automatically scheduled for implementation during the maintenance window.
【多选题】Which two statements are true regarding the SQL Repair Advisor?()
A.
The SQL Repair Advisor can be invoked to tune the performance of the regressed SQL statements.
B.
The SQL Repair Advisor can be invoked even when the incident is not active for a SQL statement crash.
C.
The SQL Repair Advisor is invoked by the Health Monitor when it encounters the problematic SQL statement.
D.
The DBA can invoke the SQL Repair Advisor when he or she receives an alert generated when a SQL statement crashes and an incident is created in the ADR.