hive数据定义

1. Hive offers no support for row-
level inserts, updates, and deletes. Hive doesn’t support transactions. Hive adds ex-
tensions to provide better performance in the context of Hadoop and to integrate with

custom extensions and even external programs

2. Hive will create a directory for each database. Tables in that database will be stored in
subdirectories of the database directory. The exception is tables in the default database,
which doesn’t have its own directory.