1.hive命令登录HIVE数据库后，执行show databases;命令可以看到hive数据库中有一个默认的default数据库。
[root@hadoop hive]# hive Logging initialized using configuration in file:/usr/local/hive/conf/hive-log4j2.properties Async: true Hive-on-MR is deprecated in Hive 2 and may not be available in the future versions. Consider using a different execution engine (i.e. spark, tez) or using Hive 1.X releases. hive> show databases; OK default #可以看到HIVE默认自带了一个数据库default Time taken: 21.043 seconds, Fetched: 1 row(s) hive>