Big data a Typical large enterprise .5,000-50,000 servers, Terabytes of data, millions of Txn per day In contrast, many Internet companies o Millions of servers, petabytes of data Google o Lots and lots of Web pages a Billions of Google queries per day ◆ Facebook: d abillion facebook users n Billion+ Facebook pages Twitter a hundreds of million twitter accounts n Hundreds of million Tweets per day 2021/1/30 同济大学软件学院 62021/1/30 6 Big Data ◼ Typical large enterprise: ◆ 5,000-50,000 servers, Terabytes of data, millions of Txn per day. ◼ In contrast, many Internet companies ◆ Millions of servers, petabytes of data ◆ Google:  Lots and lots of Web pages  Billions of Google queries per day ◆ Facebook:  A billion Facebook users  Billion+ Facebook pages ◆ Twitter:  Hundreds of million Twitter accounts  Hundreds of million Tweets per day