However, they are very useful on large clusters or with multiple teams/individuals using Hive for different reasons. Running some commands, we can see we have a database named default and there’s no table in it. DESCRIBE DATABASE. The structured data can be handled with the Hive query language. Returns the metadata of an existing database. Description of the Hive database. SCHEMA in ALTER is added in hive 0.14.0 and later. This command shows meta data about the hive table which includes list of columns,data types and location of the table.There are three ways to describe a table in Hive. In CDH 5.5 / Impala 2.3 and higher, you can specify the name of a complex type column, which takes the form of a dotted path. table_name: A table name, optionally qualified with a database name. We will start by mainly executing database commands. HIVE-11241 Database prefix does not work properly if table has same name Closed HIVE-11261 DESCRIBE database qualifier does not work when calling DESCRIBE on column or nested columns. Please use ide.geeksforgeeks.org, From Hive-0.14.0 release onwards Hive DATABASE is also called as SCHEMA. Its syntax is as follows: DROP DATABASE StatementDROP (DATABASE|SCHEMA) [IF EXISTS] database_name [RESTRICT|CASCADE]; The following queries are used to drop a database. A command line tool and JDBC driver are provided to connect users to Hive. Structure can be projected onto data already in storage. The usage of SCHEMA and DATABASE are same. Hive stores data at the HDFS location /user/hive/warehouse folder if not specified a folder using the LOCATION clause while creating a table. With Hive, when you create a database, it is easy to assign useful metadata to a database as description, author and much more options. The path might include multiple components in the case of a nested type definition. The USE command is used to use databases to work on it. Before becoming an open source project of Apache Hadoop, Hive was originated in Facebook. Log In. schema/database A configured storage plugin instance with or without a configured workspace. There are two solutions:[crayon-60424f194d01a073764201/]Get the delimiter of a Hive … Show and Describe Database. Drop Database Statement. So, by using it, a base table can be divided into multiple logical constructs or tables. It is used to querying and managing large datasets residing in distributed storage. Hive is a lightweight and blazing fast key-value database written in pure Dart. Before we move on to install hive on Ubuntu, let’s quickly recap on “What is Hive?” Hive, a data warehousing tool developed at Facebook that can be placed within a hadoop cluster to get a structured view of big data that stored underneath the … Declaración Drop Database. Apache Hive TM. DESCRIBE EXTENDED transaction; DML Commands in HIVE DML is the short name of Data Manipulation Language which deals with data manipulation and includes most commonly used SQL statements such as SELECT, INSERT, UPDATE, DELETE, etc., It is primarily used to store, modify, retrieve, delete and update data in a database. Hive DDL stands for (Data Definition Language) which are used to define or change the structure of a Databases and Tables. PARTITIONED BY. Date: 17/11/2019 Author: Sheikh M.Muneer 0 Comments. generate link and share the link here. Related statements. The location is configurable and we can change it as per our requirement. Priority: Major . Getting Started with Hadoop Hive . The hive will create a directory for each of its created databases. Fast, Enjoyable & Secure NoSQL Database. So, Both SCHEMA and DATABASE are same in Hive. The DESCRIBE DATABASE statement in Hive shows the name of Database in Hive, its comment (if set), and its location on the file system. Getting ready The DESCRIBE DATABASE command is used to get information about the database, such as the name of the database, its comment (if attached during the creation of the database), its location on the filesystem, and its dbproperties . The SHOW DATABASES statement lists all the databases … The Hive concept of a database is essentially just a catalog or namespace of tables. Creating and Describe Database with metadata. DESCRIBE database in Hive; The DESCRIBE command is used to check the associated metadata with the database. Generic tables will have is_generic=true. If the optional EXTENDED option is specified, it returns the basic metadata information along with the database properties. table_name: A table name, optionally qualified with a database name. The option will show the database location and the other information regarding that database. We can add some properties or information to our database in the form of a key-value pair with this option. Test connection to the HMS with Hive Cli. Hive 0.10 Hive 0.11 FUTURE Current SQL Compatibility Command Line Function Hive Run query hive ‐e 'select a.col from tab1 a' Run query silent mode hive ‐S ‐e 'select a.col from tab1 a' Set hive config variables hive ‐e 'select a.col from tab1 a' ‐hiveconf hive.root.logger=DEBUG,console The uses of SCHEMA and DATABASE are interchangeable – they mean the same thing. Syntax: [database_name.] DESCRIBE DETAIL [db_name. You may want to run Derby as a Network Server, this way multiple users can access it simultaneously from different systems. The primary purpose of defining an external table is to access and execute queries on data stored outside the Hive. data_type. step 1: set up a Hive Metastore. Apache Hive is a Data warehouse system which is built to work on Hadoop. DESCRIBE|DESC DATABASE shows the name of the database, its comment (if one has been set), and its root location on the filesystem. format. Complete the following steps to use the DESCRIBE command: VARCHAR2(4000) The connection string (URI and port number) for the metastore database. The Location option helps the user to override the default location where the database directory is made. 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