Suppose you issue the analyze command for the whole table Table1, then issue the command: DESCRIBE EXTENDED TABLE1; then among the … The EXTENDED can be used to get the database properties. What does the following fields: 'totalSize' and 'rawDataSize' mean in DESCRIBE EXTENDED query output in hive? delta.``: The location of an existing Delta table. We can see the Hive tables structures using the Describe commands. The optional format of describe output. For materialized views, DESCRIBE EXTENDED or FORMATTED provides additional information on whether rewriting is enabled and whether the given materialized view is considered to be up-to-date for automatic rewriting with respect to the data in the … [email protected]. LOCKS is supported from Hive 3.2.0 via HIVE-17683. These words can be used interchangeably. This method is useful when you want to identify the size of known table. SHOW TABLES is used to show both tables and views. VECTORIZATION is supported from Hive 2.3.0 via HIVE-11394. You can use the abbreviation DESC for the DESCRIBE statement. Followings can be given with or without giving database information. The Describe has following variation. Hive; HIVE-18950; DESCRIBE EXTENDED missing details of default constraint. DESCRIBE and DESCRIBE EXTENDED statements can be used for views like for tables, however, for DESCRIBE EXTENDED, the detailed table information has a variable named typeable which has value = ‘virtual view’ for views. table_identifier [database_name.] The use of EXTENDED in the EXPLAIN statement produces extra information about the operators in … Log In. Hive DDL Table Commands. The first section shows the output of DESCRIBE without EXTENDED or FORMATTED (i.e., the schema including the comments for each column). describe table. DESCRIBE DATABASE EXTENDED student; Step 2: Use ALTER to change the parent-directory location (NOTE: /hive_db is the available directory on my HDFS ). When creating the database or table in the hive we already have seen why we are using if not exists command. //user/hive/wrehouse/bank_src.db/customer_txn, inputFormat:org.apache.hadoop.mapred.TextInputFormat, # col_name              data_type               comment, //user/hive/wrehouse/bank_src.db/customer_txn. Create Table. Note that, table size will be mentioned in “bytes”. The hive will create a directory for each of its created databases. Describe extended will also shows database’s properties given under DBPROPERTIES argument at the time of creation. The results are easy to understand.The complete table information is displayed in a clean manner by describe formatted command, Your email address will not be published. Syntax: DESCRIBE DATABASE/SCHEMA [EXTENDED] db_name; DDL DESCRIBE DATABASE Example: 4. AUTHORIZATION is supported from HIVE 0.14.0 via HIVE-5961. To make it simple for our example here, I will be Creating a Hive … Statistics are stored in the Parameters array. The uses of SCHEMA and DATABASE are interchangeable. Is there any way to run “describe extended table” in Hive and have the results returned in JSON, XML, or some easily parsed format? DESCRIBE [DATABASE] [FORMATTED|EXTENDED] object_name object_name ::= [db_name.]table_name[.complex_col_name...] Vi que el manual del lenguaje Hive tiene esto . Tags: hive, sql Is there any way to run “describe extended table” in Hive and have the results returned in JSON , XML , or some easily parsed format? DESCRIBE DATABASE in Hive. A - MAP is Key-value pair but STRUCT is series of values. If the EXTENDED is specified, it show/displays all the metadata for the specified table. For a view, DESCRIBE EXTENDED or FORMATTED can be used to retrieve the view's definition. by netgana Posted on December 28, 2017 June 23, 2019. Two formats for the describe partition syntax depending the database is specified or not. DESCRIBE [EXTENDED|FORMATTED] [db_name. AUTHORIZATION is supported from HIVE 0.14.0 via HIVE-5961. To rename a Table use ALTER TABLE command. The Describe can be used on the below three to get/displays information for the specified type. Describe database. hive > (DESCRIBE | DESC) (DATABASE | SCHEMA) [EXTENDED] database_name We can observe the differences between Describe with Extended and without Extended argument in the below examples. Use DESCRIBE EXTENDED Output. The DESCRIBE FORMATTED variation displays additional information, in a format familiar to users of Apache Hive. We and our partners share information on your use of this website to help improve your experience. DESCRIBE SCHEMA is added in Hive 0.15. The DESCRIBE DATABASE statement in Hive shows the name of Database in Hive, its comment (if set), and its location on the file system. In this section, let’s learn the most used HIve DDL commands that are used on the Tables. AST was removed from EXPLAIN EXTENDED in HIVE-13533 and reinstated as a separate command in HIVE-15932. DESCRIBE FORMATTED default.partition_mv_1; Example output is: Hive supports many types of tables like Managed, External, Temporary and Transactional tables. In this article, you will learn how to list out the properties of a database or a table in Hive. table_name: A table name, optionally qualified with a database name. Your email address will not be published. The extra information includes low-level details such as … Hive Quiz : This Hive Beginner Quiz contains set of 60 Hive Quiz which will help to clear any mcq exam which is designed for Beginner. The uses of SCHEMA and DATABASE are interchangeable. Here, EXTENDED adds no additional output: hive> DESCRIBE mydb.employees.salary; salary float Employee salary What is the difference between describe table vs show create table? Difference between describe and describe extended command in Hive? Q 19 - The difference between the MAP and STRUCT data type in Hive is. Mirror of Apache Hive. AST was removed from EXPLAIN EXTENDED in HIVE-13533 and reinstated as a separate command in HIVE-15932. DESCRIBE DATABASE EXTENDED student; Step 2: Use ALTER to change the parent-directory location (NOTE: /hive_db is the available directory on my HDFS ). DESCRIBE of View and Column is also same to get respective details specified. There is nothing like SHOW VIEWS in Hive. partition_spec table_name: A table name, optionally qualified with a database name. Export The describe formatted command returns the detailed table information in a clean manner. Contribute to apache/hive development by creating an account on GitHub. DATABASE LEVEL: DESCRIBE DATABASE db_name;DESCRIBE SCHEMA db_name;Database or schema both are the same thing. EXTENDED, FORMATTED keyword is optional. Hive; HIVE-6928; Beeline should not chop off "describe extended" results by default B - DESCRIBE EXTENDED C - DESCRIBE FORMATTED D - DESCRIBE COLUMN Q 22 - The partitioning of a table in Hive creates more A - subdirectories under the database name B - subdirectories under the table name C - files under databse name D - files under the table name Q 23 - The "strict" mode when querying a partitioned table is used to The describe extended command will show the detailed information of the table such as list of columns , data type of the columns,table type,location of the table,table size and so on. The optional format of describe output. You can view the stored statistics by issuing the DESCRIBE command. After creating the database or table we can use describe command to see the structure of that database or table. DESCRIBE DATABASE shows/displays the name of the database, its comment and the root location on the file system. ]table_name PARTITION partition_spec. Required fields are marked *. USE DATABASE in Hive. In this recipe, you will learn how to describe databases in Hive. Currently, the column information associated with a particular partition is not used while preparing plans. Apache Hive Online Practice Test contains some tricky Hive interview question, which will help you for prepare Apache Hive interview. Hive describe extended table return json Tags: hive, sql. Here, EXTENDED adds no additional output: hive> DESCRIBE mydb.employees.salary; salary float Employee salary Describe database commands only shows location and comment for the database. So not exactly this table is X size. Describe partition lists/describes metadata for a given partition. SHOW TABLES is used to show both tables and views. how to add data to attribute table in arcgis arcgis field types arcgis pro add field to attribute table arcgis pro cannot add field arcgis pro calculate field arcgis pro … If EXTENDED is specified then additional metadata information (such as parent database, owner, and access time) is returned. In this topic, we described about the below sections -. VECTORIZATION is supported from Hive 2.3.0 via HIVE-11394. Two relevant attributes are provided: both the original view definition as specified by the user, and an expanded definition used internally by Hive. Other methods to identify table size is to use DESCRIBE EXTENDED output. Learning Computer Science and Programming, Write an article about any topics in Teradata/Hive and send it to materialized_view_name The name of the materialized view. We can use Describe Database Extended to list database properties as well. Get summary, details, and formatted information about the materialized view in the default database and its partitions. It will clear your queries. The output is very similar to that of DESCRIBE table_name. Apache hive is a data-warehousing tool built on top of Hadoop. describe database; Describe table. Once the statistics are built, we can check the statistics by the DESCRIBE EXTENDED/FORMATTED statement. | db_name. partition_spec Two formats are available to describe table/view/column syntax depending the database is specified or not. If you only want to see the schema for a particular column, append the column to the table name. The describe extended command will show the detailed information of the table such as list of columns , data type of the columns,table type,location of the table,table size and so on. The database is used for storing information. hive > (DESCRIBE | DESC) (DATABASE | SCHEMA) [EXTENDED] database_name We can observe the differences between Describe with Extended and without Extended argument in the below examples. There is nothing like SHOW VIEWS in Hive. LOCKS is supported from Hive 3.2.0 via HIVE-17683. It would seem that if you include the partition it will give you a raw data size. These statistics serve as an input to the Hive Cost-Based Optimizer (CBO), which is an optimizer to pick the query plan with the lowest cost in terms of system resources required to complete the query. Setting Up HDFS Location for Database. By default, hive stores its data at /user/hive/warehouse on HDFS. Syntax: describe extended table_name; In describe database command you can see that each database has HDFS directory assigned to it. It does not provide true DDL but you can use the information provided to build the DDL statement. EXTENDED also shows the database properties. ]materialized_view_name; db_name The database name. 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., If the FORMATTED is specified, it show/displays the metadata in a tabular format. [EXTENDED]: This is an optional clause. Or is there an existing parse in Java that can parse this type of format? 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.eval(ez_write_tag([[580,400],'revisitclass_com-medrectangle-3','ezslot_3',118,'0','0'])); If you want to see the primary information of the Hive table such as only the list of columns and its data types,the describe command will help you on this. Below is the sample DESCRIBE EXTENDED table output. The structured data can be handled with the Hive query language. Examples. Apache Hive. DESCRIBE shows/displays the list of columns (including partition columns) for the given table. Hive Describe Formatted/Extended Output. Posted on April 23, 2018 April 23, 2018 by tecknobite. 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., Me gustaría ver todas las particiones junto con la url en hdfs o s3 donde se almacenan los datos. The database is used for storing information. The hive will create a directory for each of its created databases. The use of EXTENDED in the EXPLAIN statement produces extra information about the … jdbc:hive2://> DESCRIBE FORMATTED employee; jdbc:hive2://> DESCRIBE EXTENDED employee; Truncate Table. EXTENDED also shows the database properties. DESCRIBE DATABASE EXTENDED db_name; Use the above command to list all the database properties attached… DESCRIBE [EXTENDED | FORMATTED] [db_name. In this article, we are going to see options that are available with databases in the Hive. table_identifier [database_name.] Tag: describe extended Hive :- Describe Table vs Show Create Table. In this article, we are going to see options that are available with databases in the Hive. Describe function extended [function name]: Displays extended description of the particular function Types of Hive Functions: UDF (User defined Functions): It is a function that fetches one or more columns from a row as arguments and returns a single value If you only want to see the schema for a particular column, append the column to the table name.