What is default schema in Hive?

Question

There is not default schema in Hive, in order to query data in hive you have to first create a table explaining the content of your data (by using create external table . location ). So you basically have to tell hive the "scheme" before querying the data. 16 окт. 2015 г.

What is schema in Hive?

Hive stores the schema of the Hive tables in a Hive Metastore. Metastore is used to hold all the information about the tables and partitions that are in the warehouse. By default, the metastore is run in the same process as the Hive service and the default Metastore is DerBy Database.

Where is schema of Hive tables are stored?

Hive data are stored in one of Hadoop compatible filesystem: S3, HDFS or other compatible filesystem. Hive metadata are stored in RDBMS like MySQL, see supported RDBMS. The location of Hive tables data in S3 or HDFS can be specified for both managed and external tables.

What is metadata in Hive?

What is Hive Metastore? Metastore is the central repository of Apache Hive metadata. It stores metadata for Hive tables (like their schema and location) and partitions in a relational database. It provides client access to this information by using metastore service API.

How do I list all the tables in a Hive schema?

Examples1Issue the SHOW SCHEMAS command to see a list of available schemas. ... 2Issue the USE command to switch to a particular schema. ... 3Issue the SHOW TABLES command to see the views or tables that exist within workspace. ... 4Switch to the Hive schema and issue the SHOW TABLES command to see the Hive tables that exist.

Expert · Answer