The following query is executed to create a database named userdb: hive> CREATE DATABASE … Here, the LOCATION will override the default location where the database directory is made. To access the database through the Impala daemon on a different node, issue the INVALIDATE METADATA statement first while connected to that other node.. I am creating a database in hive with multiple location for example. Hive by default contains a default database, you can get this using SHOW DATABASES; statement. CREATE DATABASE was added in Hive 0.6 ().. In Databricks Runtime 8.0 and above the USING clause is optional. So, we can maintain multiple tables within a database where a unique name is assigned to each table. The syntax for this statement is as follows: Here, IF NOT EXISTS is an optional clause, which notifies the user that a database with the same name already exists. Before we start with the SQL commands, it is good to know how HIVE stores the data. Hive – What is Metastore and Data Warehouse Location? The conventions of creating a table in HIVE is quite similar to creating a table using SQL. This chapter explains how to create a table and how to insert data into it. Here are the illustrated steps to change a custom database location, for instance "dummy.db", along with the contents of the database. CREATE DATABASE Temp LOCATION '/hive_db'; 2. If you wanted to check if the database already exists before creating, use IF NOT EXISTS clause. Syntax: CREATE (DATABASE|SCHEMA) [IF NOT EXISTS] database_name [COMMENT database_comment] [LOCATION hdfs_path] [WITH DBPROPERTIES (property_name=property_value, ...)]; DDL CREATE DATABASE Example: A database in Hive is a namespace or a collection of tables. Tables in that database will be stored in sub directories of the database directory. You can download dependency from Maven or use the below dependency on your pom.xml. By default all the hive databases will be created under default warehouse directory (set by the property hive.metastore.warehouse.dir) as /user/hive/warehouse/database_name.db. but i am getting error while doing this. The CREATE DATABASE statement is used to create a database in the Hive. If you want to contribute, please email us. You can change the location of the database where to create by using any of the below commands, You can also change the default location using hive.metastore.warehouse.dir. et al. Example: Create the database with the name Temp in /hive_db directory on HDFS. HIVE is supported to create a Hive SerDe table. Where Does Hive Stores Data Files in HDFS? Hive by default creates a directory with a database name .db extension (for example emp.db) under its warehouse directory. Internal tables Internal Table is tightly coupled in nature.In this type of table, first we have to create table and load the data. 1. In case you want to check the status of a Database such as it’s location, you can use DESCRIBE DATABASE command. 2. In Hive, table can be created with or without the database, If you wanted to create in a database, specify database name qualifier. The below is the syntax to create the database. To specify the location of an external table, you need to include the specification in the table creation statement as follows: Post was not sent - check your email addresses! Hive – Relational | Arithmetic | Logical Operators, Spark SQL – Select Columns From DataFrame, Spark Cast String Type to Integer Type (int), PySpark Convert String Type to Double Type, Spark Deploy Modes – Client vs Cluster Explained, Spark Partitioning & Partition Understanding, PySpark partitionBy() – Write to Disk Example. Create Table is a statement used to create a table in Hive. If you have a lot of databases, you can restrict the ones listed using a regular expression. I this post, I describe how to Create a Hive Database, Create Database using JDBC, Describe and Show hive Database. Initially, we check the default database provided by Hive. Note: If you are using an older version of Hive, you should use the driver org.apache.hadoop.hive.jdbc.HiveDriver and your connection string should be jdbc:hive://. Now I am creating a table name “employ_detail” in the database “dataflair”. After creating a database, your impala-shell session or another impala-shell connected to the same node can immediately access that database. CREATE TABLE weather (wban INT, date STRING, precip INT) ROW FORMAT DELIMITED FIELDS TERMINATED BY ‘,’ LOCATION ‘ /hive/data/weather’; ROW FORMAT should have delimiters used to terminate the fields and lines like in the above example the fields are terminated with comma (“,”). The following commands are used to compile and execute this program. Topics can be: CREATE DATABASE was added in Hive 0.6. Python, Using CREATE DATABASE statement you can create a new Database in Hive, like any other RDBMS Databases, the Hive database is a namespace to store the tables. The syntax and example are as follows: Syntax Create Database in Hive; The first step when start working with databases is to create a new database. Hive creates a directory for each database. Scala, Java, Data Mining, You can change the location of the database where to create … If you don’t specify the USING clause, DELTA is the default format. Deep Learning, The following query is executed to create a database named userdb: The following query is used to verify a databases list: The database directory is created under a top-level directory specified by the property hive.metastore.warehouse.dir, You can override this default location for the new directory as shown in this example: In case you want to check the status of a Database such as it’s location, you can use DESCRIBE DATABASE command. Nice and clear explanation, Thanks for the content. DATABASE or SCHEMA is same thing in behavior. When the table is dropped later, its data will be deleted from the file system. Since in HDFS everything is FILE so HIVE stores all the information in FILEs only. * part): To use a Database, use the USE Command, URL for this post : http://www.learn4master.com/algorithms/apache-hive-usage-example-create-database. Once you have access to HIVE , the first thing you would like to do is Create a Database and Create few tables in it. 1. It does not provide true DDL but you can use the information provided to build the DDL statement. You can use SHOW DATABASES to list all the databases already created. You can leave a comment or email us at [email protected] By default, the location for default and custom databases is defined within the value of hive.metastore.warehouse.dir, which is /apps/hive/warehouse. Query to Create Database. CREATE DATABASE sample1 location 'hdfs://nameservice1:8020/db/dev/abc','hdfs://nameservice1:8020/db/dev/def','hdfs://nameservice1:8020/db/dev/ghi'. For each database, HIVE will create a directory and the tables say “EMP” in that database and say “financial” is stored in sub-directories. Creating an External Table in Hive – Syntax Explained; Create a Hive External Table – Example. Sorry, your blog cannot share posts by email. Specifying a database location in the CREATE DATABASE command, for example CREATE DATABASE LOCATION '' works for managed tables only. When working with tables and databases in HIVE. Note: By default, the Hive tables are created in the warehouse directory , the location is specified in value for the key hive.metastore.warehouse.dir on the config file $HIVE_HOME/conf/hive-site.xml , by default, the warehouse location would be /user/hive/warehouse . Hive also provides a default database with a name default. The location for external hive database is “/warehouse/tablespace/external/hive/” and the location for manage database is “/warehouse/tablespace/managed/hive”. What are the Different Types of Tables present in Apache Hive, How to Drop Table & Database Explained with Examples, What is a Temporary Table and its Usage with Examples, Difference Between Managed vs External Tables. We can use either DATABASE or SCHEMA. The uses of SCHEMA and DATABASE are interchangeable – they mean the same thing. Below are complete Java and Scala examples of how to create a Database. In Databricks Runtime 7.x, when you don’t specify the USING clause, the SQL parser uses the CREATE TABLE with Hive format syntax to parse it. In the below Java and Scala examples, I am connecting to the Hive default database and creating a new Hive database emp. In this example, I am creating a table in the database “dataflair”. Big data, Note: when you running SQL statements on Hive or beeline shell terminal, the statement should end with a semicolon. ... [COMMENT table_comment] [LOCATION hdfs_path] Hive Create Table Usage. By default warehouse directory located is /user/hive/warehouse on hdfs. Next, verify the database is created by running the show command: show databases; 3. How to start HiveServer2 & Connect Beeline. Create Database is a statement used to create a database in Hive. 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Beeline Hive Command Options and Examples; Hive Create Table Command and Examples; Hive Describe Formatted/Extended Output. Note. If you continue to use this site we will assume that you are happy with it. Go to Hive shell by giving the command sudo hive and enter the command ‘create database’ to create the new database in the Hive. All these commands and their options are from hive-0.14.0 release documentations. "CREATE" DATABASE LEVEL: To create the database with properties CREATE DATABASE TestDBWITH dbProperties(‘Creator: ‘= ‘Username’, ‘Created-Date:’ = ‘01-01-2020’); Or we can just create the database without any properties. The syntax for this statement is as follows: CREATE DATABASE|SCHEMA [IF NOT EXISTS] Here, IF NOT EXISTS is an optional clause, which notifies the user that a database with the same name already exists.