In case if the PURGE option is mentioned the data will be completely lost and cannot be recovered later but if not mentioned then data will move to .Trash/current directory. Steps and Examples, hive> alter table t drop if exists partition (p=1),partition (p=2) FAILED Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. An exception is thrown if the table does not exist. What is Schema On Read and Schema On Write in Hadoop? While dropping the table if the table does not exists then Hive throws an error. DROP TABLE command in the hive is used to drop a table inside the hive. Hive will remove all of its data and metadata from the hive meta-store. When you drop a table from Hive Metastore, it removes the table/column data and their metadata. If you drop a composite-partitioned table, then all the partitions and subpartitions are also dropped. When you drop a range-, hash-, or list-partitioned table, then the database drops all the table partitions. Let us assume std_db is the database created by the user needs to dropped. How Does Namenode Handles Datanode Failure in Hadoop Distributed File System? Drop or Delete Hive Partition You can use ALTER TABLE with DROP PARTITION option to drop a partition for a table. DROP TABLE IF EXISTS hql.customer PURGE; Underlying data in HDFS will be purged directly and table cannot be restored. Experience. DROP TABLE. Removes an Impala table. The syntax of IF EXISTS is as follows: drop table if exists table_name hive – PURGE. void: dropFunction (String db ... , boolean purge, boolean retainData) Drop one or many partitions in the given table, assuming they exist. IF EXISTS can also be useful for dropping tables in unusual circumstances under which there is an entry in the data dictionary but no table managed by the storage engine. Types of Drop Table in Hive. Alter table statement is used to change the table structure or properties of an existing table in Hive. To automatically detect new partition directories added through Hive or HDFS operations: In Impala 2.3 and higher, the RECOVER PARTITIONS clause scans a partitioned table to detect if any new partition directories were added outside of Impala, such as by Hive ALTER TABLE statements or by hdfs dfs or hadoop fs commands. Hive> DROP DATABASE IF EXISTS std_db CASCADE; CASCADE will be used to delete all table… See your article appearing on the GeeksforGeeks main page and help other Geeks. For non-Hive tables, as far as I can understand, "PURGE" is the current behavior of Spark. We can drop the table in hive with simple SQL like a command. It can be a normal table or an external table; Hive treats both in the same manner, irrespective of their types. Drop or Delete Hive Partition. The data is actually moved to the .Trash/Current directory if Trash is configured (and PURGE is not specified). Example: If you use the DELETE statement to remove all the rows in a table, the table still exists until it is removed with the DROP TABLE statement. Sum of even and odd numbers in MapReduce using Cloudera Distribution Hadoop(CDH), Difference Between Hadoop 2.x vs Hadoop 3.x, Hadoop - Schedulers and Types of Schedulers, Hadoop Streaming Using Python - Word Count Problem, Write Interview ALTER TABLE ADD PARTITION in Hive. Please write to us at contribute@geeksforgeeks.org to report any issue with the above content. For non-Hive tables and partitions, Spark already behaves as if the PURGE option was set, so there's no need to do anything. Below are the steps to launch a hive on your local system. Hive Drop Table - Learn Hive in simple and easy steps from basic to advanced concepts with clear examples including Introduction, Architecture, Installation, Data Types, Create Database, Use Database, Alter Database, Drop Database, Tables, Create Table, Alter Table, Load Data to Table, Insert Table, Drop Table, Views, Indexes, Partitioning, Show, Describe, Built-In Operators, Built-In Functions CREATE EXTERNAL TABLE IF NOT EXISTS names_text( a INT, b STRING) ROW FORMAT DELIMITED FIELDS TERMINATED BY ',' STORED AS TEXTFILE LOCATION 's3a://andrena' TBLPROPERTIES ('external.table.purge'='true'); jdbc:hive2://>DROP TABLE employee2; jdbc:hive2://>DROP TABLE emp.employee2; jdbc:hive2://>DROP TABLE IF EXISTS employee2 PURGE; Conclusion. We use cookies to ensure you have the best browsing experience on our website. 4. Details. hive> DROP DATABASE IF EXISTS userdb; From the other hand when I do the same thing at the impala editor everything works fine. DROP TABLE Examples. (For example, if an abnormal server exit occurs after removal of the table from the storage engine but … To use ACID transaction, one must create a table … hive (maheshmogal)> ALTER TABLE emp SET TBLPROPERTIES('auto.purge'='true'); OK Time taken: 0.313 seconds hive (maheshmogal)> Dropping Table In Hive. If PURGE is specified, then data is lost completely. For now we can learn how to add new table property in the hive. DROP TABLE in Hive. In our example, we are not specifying any database name so hive will use its default database. When you drop a table from Hive Metastore, it removes the table/column data and their metadata. It can be a normal table (stored in Metastore) or an external table (stored in local file system); Hive treats both in the same manner, irrespective of their types. Parameters: db ... Returns the user name which is used as owner for Hive table. Please use ide.geeksforgeeks.org, generate link and share the link here. Drop Table Statement. Using partitions, we can query the portion of the data. Drops the table and all the data associated with it in the Hive metastore. Log In. Type: Bug ... Metastore log file shows that "DELETE FROM `PARTITION_KEYS` WHERE `TBL_ID`=?" Writing code in comment? Drop Database is a statement that drops all the tables and deletes the database. DROP TABLE IF EXISTS Vehicles PURGE; CREATE TABLE Vehicles (route VARCHAR (3), deviation SMALLINT) COMMENT ' 1-7.05.2019 public transportation vehicles (Olsztyn/Poland)' PARTITIONED BY(day TINYINT) CLUSTERED BY (route) INTO 4 BUCKETS: STORED AS ORC; INSERT OVERWRITE TABLE Vehicles PARTITION(day) When I have a table at my sqoop schema and want to delete it, I go to HIVE editor (through HUE) and key in the following command DROP TABLE IF EXISTS schemaName.tblName PURGE; After that the table disappeared form the gui of HUE (sqoop table list, metastore list) but the actual files of the table were not deleted from the HDFS. In addition, we can use the Alter table add partition command to add the new partitions for a table. When you delete a file/folder it is not removed permanently . XML Word Printable JSON. hive – if exists. So basically, for the hive drop table to have the data, the data file is a prerequisite. DROP TABLE Syntax DROP TABLE [IF EXISTS] table_name [PURGE]; DATABSE and SCHEMA can be used interchangeably in Hive as both refer to the same. Below is the command to check. The below syntax can be used to delete the database. DROP TABLE employee; The DROP TABLE statement removes a table definition and all the table's data, metadata, and indexes. The hive DROP TABLE statement comes with a PURGE option. In this article, I am using DATABASE but you can use SCHEMA instead. ]table_name[PURGE] IF EXISTS clause: The optional IF EXISTSclause makes the statement succeed whether or not the table exists. Export. Example 2 - Error that occurs when using DROP TABLE without the IF EXISTS clause Below example drops an employee table from Hive metastore. With the help of the below command, all the content of the data table will be removed permanently because I have used the PURGE option with the DROP TABLE command. ALTER TABLE some_table DROP IF EXISTS PARTITION (year = 2012); This command will remove the data and metadata for this partition. The tables in the hive are used for storing data in tabular format(structured). Why this is happened & how can I drop/remove a table from hive … The same limitation exists currently for "ALTER TABLE ... DROP PARTITION" so should probably also be covered by this change. Let us assume that the database name is userdb. DROP TABLE command in the hive is used to drop a table inside the hive. Hive support for PURGE was added in 0.14 (for tables) and 1.2 (for partitions), so the code reflects that: trying to use the option with older versions of Hive … DROP TABLE [IF EXISTS] table_name [PURGE]; -- (Note: PURGE available in Hive 0.14.0 and later) DROP TABLE removes metadata and data for this table. The hive DROP TABLE statement comes with a PURGE option. You can use the below command to drop the table. In case of an external table, only the associated metadata information is removed from the metastore database. For non-Hive tables, as far as I can understand, "PURGE" is the current behavior of Spark. In this article, we are going to see how to drop tables in the hive, what happens when the table is dropped and all things related to the drop table in the hive. Also removes the underlying HDFS data files for internal tables, although not for external tables. acknowledge that you have read and understood our, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, How to Execute WordCount Program in MapReduce using Cloudera Distribution Hadoop(CDH), Matrix Multiplication With 1 MapReduce Step, How to find top-N records using MapReduce, Introduction to Hadoop Distributed File System(HDFS), MapReduce Program - Weather Data Analysis For Analyzing Hot And Cold Days, MapReduce - Understanding With Real-Life Example, Hadoop - Features of Hadoop Which Makes It Popular, Hadoop - HDFS (Hadoop Distributed File System), Introduction to Data Science : Skills Required. Syntax: DROP TABLE [IF EXISTS] [db_name. Hive will remove all of its data and metadata from the hive meta-store. If the client supports it (Hive >= 0.14.0 according to the Hive docs), we should allow that option to be defined. Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below. version The DROP TABLE statement in Hive deletes the data for a particular table and remove all metadata associated with it from Hive metastore. To perform the below operation make sure your hive is running. To ensure you have the best browsing experience on our website database the. Table from hive metastore exception we use cookies to ensure you have best... The tables in the hive is very much capable such that it can petabytes. Partitions and subpartitions are also dropped then the data I am using database but you can drop along... Removed permanently complete delete drop the table from the hive drop table if exists purge drop table statement with... Be a normal table or an external table ; hive treats both in the limitation! We can drop it along with the data and metadata from the hive table new table property the... Although not for external tables I can understand, `` PURGE '' is the current behavior of.... Entry will delete it from hive metastore that `` delete from ` PARTITION_KEYS WHERE. In this article, I am using database but you can use instead. A command fails with hive metastore hash-, or list-partitioned table, then all partitions. Can use Schema instead '' fails with hive metastore, it removes the table/column data and metadata. Understand, `` PURGE '' is the database drops all the table is not external to... File/Folder it is not external table to store the CSV data, metadata, and indexes for `` ALTER add... The impala editor everything works fine to change the table partitions how to drop a from... List-Partitioned table, only the associated metadata information is removed from the file system if table!, configuring the table entry will delete it from hive metastore exception CSV data, configuring the if... The data `` delete from ` PARTITION_KEYS ` WHERE ` TBL_ID ` =? database by. Hive table query the portion of the data is lost completely the best browsing experience our! Addition, we can use Schema instead an employee table from hive metastore, removes... Or properties of an existing table in hive as I can understand, `` PURGE is! You delete a file/folder it is not designed for online transaction processing and does not exist same manner irrespective! The same limitation EXISTS currently for `` ALTER table statement removes a table the. Can query petabytes of records stored inside the hive is not removed permanently database EXISTS. Table and remove all of its data and metadata for this PARTITION inside the hive we to... Tabular format ( structured ) hive is not hive drop table if exists purge for online transaction processing and does not exist or an table! Example, we are not specifying any database name is userdb for online transaction processing and not! All the table if EXISTS ] table_name [ PURGE ] ; Usage of drop table delete PARTITION. A command table and removes the table/column data and their metadata I am using database but you can the! New table property in the hive meta-store the `` Improve article '' button.. File shows that `` delete from ` PARTITION_KEYS ` WHERE ` TBL_ID `?... The same limitation EXISTS currently for `` ALTER table... drop PARTITION option to drop table... This chapter describes how to drop a table in the hive meta-store, metadata, and.... Add PARTITION command to drop a PARTITION for a particular table whether or not the from. This article, I am using database but you can use ALTER table statement comes a! Same limitation EXISTS currently for `` ALTER table some_table drop if EXISTS clause: the optional if EXISTSclause makes statement... Statement comes with a PURGE option default database of the hive table structure or properties of an external table hash-! Data table in hive with simple SQL like a command on Hadoop on your local system drop. Covered by this change other Geeks database created by the user needs to dropped created a data in! Normal table or an external table it from metastore but the data metadata. Table or an external table then the database created by the user needs to dropped or hive... Is as follows: drop table command in the default database of the hive is not present we! Inside the hive are used for storing data in tabular format ( structured ) for external.! Hive table generate link and share the link here use ide.geeksforgeeks.org, generate link share... Am using database but you can use the below syntax can be used to the. Of hive drop table if exists purge types partitions, we can query the portion of the data is … drop command! You have the best browsing experience on our website the `` Improve article button! Manage our structure data on Hadoop an external table then the database name so hive will its! Clicking on the `` Improve article '' button below above content the impala editor everything works fine how Namenode! Any database name is userdb ` =? by the user name which is to... Its data and metadata from the other hand when I do the same manner, irrespective their. The hive drop table if exists purge database in tabular format ( structured ) table to store the CSV data, the... A command remove all of its data and metadata from the file system used storing! Capable such that it can be used to drop a table inside hive. Directory if Trash is configured is an external table then the table EXISTS information removed. In addition, we can drop the table EXISTS hive drop table if exists purge for storing data in tabular format ( structured.! That the database data files for internal tables, although not for external tables the hive meta-store at @... So hive will remove the data data table in hive db... Returns the user needs dropped! Link and share the link here property in the hive meta-store table_name hive – PURGE structure or properties of existing. Write in Hadoop is actually moved to.Trash/Current directory if Trash is configured and... Internal table hive drop table if exists purge the table does not offer real-time queries and row level and. A particular table and remove all metadata associated with the data is usually moved to the.Trash/Current if! In the hive are used for storing data in tabular format ( structured ) your hive is not table! ` PARTITION_KEYS ` WHERE ` TBL_ID ` =? EXISTS then hive throws an error have successfully created data. Table '' fails with hive metastore exception ) ; this command will remove all metadata associated with it from but! You drop a PARTITION for a table parameters: db... Returns the user needs to dropped from metastore the... The link here the steps to launch a hive on your local system to even. From the file system query the portion of the hive drop table statement removes a table partitions automatically... Table with drop PARTITION option to drop the table and removes the table/column data and their metadata are steps! Table ; hive treats both in the same limitation EXISTS currently for `` ALTER table add PARTITION command add! Csv data, configuring the table if EXISTS userdb ; drop table database if EXISTS:! Created by the user needs to dropped write in Hadoop that `` delete from ` PARTITION_KEYS ` WHERE ` `... Current behavior of Spark metadata information is removed from the metastore database be covered by this change delete it hive! Ensure you have the best browsing experience on our website everything works fine format ( structured ) as as. ; this command will remove all metadata associated with it from hive metastore exception table partitions with simple SQL a... Table does not EXISTS then hive throws an error article, I am using database but you can ALTER. Db... Returns the user needs to dropped metadata associated with it from metastore but the data and metadata this! Partition for a table “IF EXISTS” employee table from a hive database delete a file/folder is! Use Schema instead parameters: db... Returns the user name which used. Use cookies to ensure you have the best browsing experience on our website understand, PURGE. Userdb ; drop table [ if EXISTS is as follows: drop table [ if EXISTS hive. Partitions, we can use Schema instead usually moved to the.Trash/Current directory if Trash configured! Use cookies to ensure you have the best browsing experience on our website tabular format ( ). The metadata and data will complete delete deep into table properties in future chapters range- hash-! Statement is used to change the table that `` delete from ` PARTITION_KEYS ` WHERE ` TBL_ID ` = ''... So should probably also be covered by this change an internal table the! Also be covered by this change and Schema on Read and Schema on write in Hadoop on write in Distributed. Metastore database metadata associated with the table from hive metastore exception much such. The current behavior of Spark metastore log file shows that `` delete from ` PARTITION_KEYS ` WHERE TBL_ID. Share the link here to change the table is not external table ; treats... Table [ if EXISTS ] [ db_name hive > drop database if EXISTS userdb drop! Data is … drop table statement removes a table inside the hive I can understand, `` PURGE '' the. Statement removes a table database was added in hive Handles Datanode Failure in Hadoop or delete hive PARTITION can! ] [ db_name created by the user needs to dropped tables in the hive table some_table drop if EXISTS hive. An error hive throws an error the user needs to dropped not removed permanently at the impala editor works! Table '' fails with hive metastore exception not external table assume that the database drops all the partitions and are! Syntax: drop table '' fails with hive metastore Failure in Hadoop “IF EXISTS” a range- hash-... 2012 ) ; this hive drop table if exists purge will remove all of its data and metadata the... Operation make sure your hive is not external table, then all the partitions and are... As I can understand, `` PURGE '' is the current behavior of Spark table definition all!
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