为方便广大考生考后估分对答案，希赛网特向广大学员和网友搜集整理了2022年数据库系统工程师上午真题（71-75），供大家参考。希赛网老师也将在考后进行真题答案解析，敬请广大考生关注。

71-75、Corporate decision makers require access to information from multiplesuch sources.Seting up queries on individual sources is both cumbersome and （71）.Moreover，the sources of data may store only current data，whereas decision makers may need access to （72） dataas well.A data warehouse is a repository （or archive）of information gathered from multiple sources，stored under a unified schema，at a （73）site.Oncegathered，the data are stored for a long time，permitting access to historical data.Thus，data warehouses provide the user with a single consolidated（74）to data，making decision-support queries easier to write.Moreover，by accessing information fordecision support from a data warehouse，the decision maker ensures that online transaction-processing systems are not（75）by the decision-supportworkdoad.

（71）

A.inefficient

B.efficient

C.easy

（72）

A.many

B.past

C.big

（73）

A.distributed

B.single

C.many

（74）

A.table

B.row

C.system

（75）

A.used

B.affected

C.supported