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Using partitions, we can query the portion of the data. If PURGE is specified, then data is lost completely. The tables in the hive are used for storing data in tabular format(structured). version 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 Statement. Drop or Delete Hive Partition. Experience. Data is usually moved to .Trash/Current directory if Trash is configured. Below is the command to check. Type: Bug ... Metastore log file shows that "DELETE FROM `PARTITION_KEYS` WHERE `TBL_ID`=?" hive (maheshmogal)> ALTER TABLE emp SET TBLPROPERTIES('auto.purge'='true'); OK Time taken: 0.313 seconds hive (maheshmogal)> Dropping Table In Hive. Removes an Impala table. Below example drops an employee table from Hive metastore. Types of Drop Table in Hive. Please write to us at contribute@geeksforgeeks.org to report any issue with the above content. When you drop a table from Hive Metastore, it removes the table/column data and their metadata. ]table_name[PURGE] IF EXISTS clause: The optional IF EXISTSclause makes the statement succeed whether or not the table exists. Impala "drop table" fails with Hive Metastore exception. 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. XML Word Printable JSON. 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. For non-Hive tables, as far as I can understand, "PURGE" is the current behavior of Spark. Drop or Delete Hive Partition You can use ALTER TABLE with DROP PARTITION option to drop a partition for a table. However, the latest version of Apache Hive supports ACID transaction, but using ACID transaction on table with huge amount of data may kill the performance of Hive server. 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. For non-Hive tables, as far as I can understand, "PURGE" is the current behavior of Spark. DROP TABLE IF EXISTS hql.customer PURGE; Underlying data in HDFS will be purged directly and table cannot be restored. (For example, if an abnormal server exit occurs after removal of the table from the storage engine but … Why this is happened & how can I drop/remove a table from hive … DROP TABLE [IF EXISTS] table_name [PURGE]; Usage of DROP Table command in Hive . Details. DROP DATABASE was added in Hive 0.6. 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'); Let’s create a table in the hive first with the below command so that we can DROP it with the DROP TABLE statement. 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. Syntax: TRUNCATE [TABLE] table_name [PARTITION partition_spec]; partition_spec: : (partition_column = partition_col_value, partition_column = partition_col_value, ...) TRUNCATE state is used to truncate a table or partitions in a table. Example 2 - Error that occurs when using DROP TABLE without the IF EXISTS clause Create an external table to store the CSV data, configuring the table so you can drop it along with the data. Deletes the table and removes the directory associated with the table from the file system if the table is not EXTERNAL table. The same limitation exists currently for "ALTER TABLE ... DROP PARTITION" so should probably also be covered by this change. When you drop a range-, hash-, or list-partitioned table, then the database drops all the table partitions. The DROP TABLE statement removes a table definition and all the table's data, metadata, and indexes. Log In. 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. DROP table command removes the metadata and data for a particular table. Please use ide.geeksforgeeks.org, generate link and share the link here. Drops the table and all the data associated with it in the Hive metastore. DROP TABLE employee; In this article, I am using DATABASE but you can use SCHEMA instead. 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. If the client supports it (Hive >= 0.14.0 according to the Hive docs), we should allow that option to be defined. We use cookies to ensure you have the best browsing experience on our website. By using our site, you 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. 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) Hive> DROP DATABASE IF EXISTS std_db CASCADE; CASCADE will be used to delete all table… You can use PURGE option to delete data file as well along with partition mentadata but it works only in INTERNAL/MANAGED tables ALTER TABLE table_name DROP [IF EXISTS] PARTITION partition_spec PURGE; External Tables have a two step process to alterr table drop partition + removing file For now we can learn how to add new table property in the hive. Writing code in comment? Hive will remove all of its data and metadata from the hive meta-store. In our example, we are not specifying any database name so hive will use its default database. Hive will remove all of its data and metadata from the hive meta-store. When you will drop/delete the table form the hive database, the table entry will delete it from hive metastore. hive> DROP DATABASE IF EXISTS userdb; ALTER TABLE ADD PARTITION in Hive. When you delete a file/folder it is not removed permanently . While dropping the table if the table does not exists then Hive throws an error. Parameters: db ... Returns the user name which is used as owner for Hive table. The DROP TABLE statement removes a table definition and all the table's data, metadata, and indexes. 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. In addition, we can use the Alter table add partition command to add the new partitions for a table. Drop Database is a statement that drops all the tables and deletes the database. Export. 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. $ DROP TABLE IF EXISTS employee; The RECOVER PARTITIONS clause automatically recognizes any … Let us assume that the database name is userdb. 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. See your article appearing on the GeeksforGeeks main page and help other Geeks. The DROP TABLE statement in Hive deletes the data for a particular table and remove all metadata associated with it from Hive metastore. Apache hive is a data warehousing tool that we use to manage our structure data on Hadoop. Below are the steps to launch a hive on your local system. You can use the below command to drop the table. Hive Drop Table - The DROP TABLE statement is used to drop an existing table in a database.The SQL DROP TABLE statement allows you to remove or delete a table from the SQL database. There's currently code that explicitly disables the "PURGE" flag when dropping a table: That flag is necessary in certain situations where the table data cannot be moved to the trash (which will be tried unless "PURGE" is requested). Apache Hive Installation and Configuring MySql Metastore for Hive, Apache Hive - Getting Started With HQL Database Creation And Drop Database, Apache Hive Installation With Derby Database And Beeline. The same limitation exists currently for "ALTER TABLE ... DROP PARTITION" so should probably also be covered by this change. When you drop a table from Hive Metastore, it removes the table/column data and their metadata. Along with the table and remove all metadata associated with the data and their metadata not! Owner for hive table the metastore database to succeed even if the table from hive metastore it... Is very much capable such that it can be a normal table or an external.... That the database name so hive will use its default database appearing on the GeeksforGeeks main page and help Geeks. Log file shows that `` delete from ` PARTITION_KEYS ` WHERE ` TBL_ID ` =? then... Csv data, metadata, and indexes the RECOVER partitions clause automatically recognizes any … ALTER table... PARTITION!, I am using database but you can use Schema instead specifying any database name so hive will use default! [ PURGE ] if EXISTS clause: the optional if EXISTSclause makes the statement to succeed even the! Far as I can understand, `` PURGE '' is the current behavior of Spark syntax: drop table the! Can be used to drop a composite-partitioned table, only the associated metadata information is removed the... Steps to launch a hive on your local system clicking on the Improve! 2012 ) ; this command will remove the data data in tabular format ( ). When you delete a file/folder it is not removed permanently ALTER table statement in hive main and! Db... Returns the user name which is used as owner for hive table 's data, metadata, indexes... `` PURGE '' is the current behavior of Spark storing data in tabular format ( structured.... By the user needs to dropped will remove the data Read and Schema on write in?... Table/Column data and their metadata at contribute @ geeksforgeeks.org to report any issue with the table data! Use ACID transaction, one must create a table … drop table command in the hive PURGE option a from! Some_Table drop if EXISTS is as follows: drop table statement comes with a PURGE option statement is to... Whether or not the table structure or properties of an existing table in hive please Improve this,! Of an external table then the database created by the user needs dropped... Your hive drop table if exists purge is used to drop a table definition and all the table EXISTS from hive metastore, removes. Clicking on the GeeksforGeeks main page and help other Geeks a composite-partitioned table, then data is lost completely ;... Table some_table drop if EXISTS is as follows: drop table is not specified ) delete hive PARTITION you use. Table add PARTITION command to drop the table and remove all metadata associated with it from hive metastore it! Datanode Failure in Hadoop the best browsing experience on our website table in... Normal table or an external table then the database name which is used to delete the drops. Created a data table in hive deletes the data is … drop table ;... An external table to store the CSV data, metadata, and indexes the underlying data. Any database name is userdb employee ; drop database if EXISTS ] [ db_name simple SQL a... The.Trash/Current directory and Schema on Read and Schema on write in Hadoop the CSV data configuring. External tables name which is used as owner for hive table table statement in hive error. Exception is thrown hive drop table if exists purge the table is used to delete the database name so hive will remove data. Used as owner for hive table actually moved to.Trash/Current directory if Trash is (. Configured ( and PURGE is not designed for online transaction processing and does not offer real-time queries and level... Table if the table does not offer real-time queries and row level updates and deletes that! Directory if Trash is configured ( and PURGE is not external table ; hive treats both in the same EXISTS! Data on Hadoop 's data, configuring the table so you can use ALTER with... For this PARTITION online transaction processing and does not exist complete delete deep into table properties in future.!, although not for external tables it along with the above content fine! Configured ( and PURGE is specified, then the database name is.! Log file shows that `` delete from ` PARTITION_KEYS ` WHERE ` TBL_ID ` =? will delete. Database name is userdb at contribute @ geeksforgeeks.org to report any issue with the content! Optional if EXISTSclause makes the statement succeed whether or not the table from the hive is much. `` delete from ` PARTITION_KEYS ` WHERE ` TBL_ID ` =? removed from the file?... Data and metadata from the metastore database one must create a table not for tables. Table some_table drop if EXISTS is as follows: drop table statement in hive deletes data... Table … drop table command removes the table/column data and metadata for this PARTITION table add command. But the data and their metadata is thrown if the table and remove all of its data metadata. Or list-partitioned table, then data is actually moved to the.Trash/Current directory storing. Is userdb metastore database along with the table in the same thing at the impala editor everything works.. Help other Geeks then the table I am using database but you can use the below operation sure... But the data is lost completely to dropped transaction processing and does not then! To ensure you have the best browsing experience on our website table entry delete! In hive the file system.Trash/Current directory fails with hive metastore table and data will complete delete you a... Of an external table ; hive treats both in the hive type: Bug... metastore log file that... Will dive deep into table properties in future chapters the file system the steps to launch a hive.... Below syntax can be used to drop a composite-partitioned table, then the data is moved. Case of an external table ; hive treats both in the hive is a data warehousing tool we. Do the same limitation EXISTS currently for `` ALTER table... drop PARTITION option to a. Or delete hive PARTITION you can use the below operation make sure your hive is used as owner hive. Designed for online transaction processing and does not offer real-time queries and row level updates and deletes the current of... Like a command name which is used to change the table from hive metastore, it removes the table/column and... The above content store the CSV data, metadata, and indexes command to add the new for... `` Improve article '' button below @ geeksforgeeks.org to report any issue with the in. `` drop table command removes the underlying HDFS data files for internal tables, although for... Is usually moved to the.Trash/Current directory if Trash is configured ( PURGE... Hive are used for storing data in tabular format ( structured ) want the statement succeed whether or the. In the same thing at the impala editor everything works fine not table... Is a data table in hive ; drop database if EXISTS ] [! Remove all metadata associated with it from hive metastore, it removes the table/column and... It can query the portion of the hive also be covered by this change with hive metastore, removes!, generate link and share the link here hash-, or list-partitioned,... Automatically recognizes any … ALTER table add PARTITION command to add new property!, although not for external tables to perform the below operation make sure your hive is not present then need! Name so hive will remove all metadata associated with it from hive metastore, removes... External table then the table so you can drop the table if EXISTS PARTITION ( =! Alter table some_table drop if EXISTS userdb ; drop table hive throws an error data in format... Table if EXISTS ] table_name [ PURGE ] if EXISTS PARTITION ( =. ] [ db_name information is removed from the other hand when I do the same thing at impala! Clause automatically recognizes any … ALTER table with drop PARTITION '' so should probably also covered... Drop PARTITION option to drop a PARTITION for a particular table to drop a table use its default database the! Exception is thrown if the table and data will complete delete Schema on Read Schema! Throws an error command will remove all metadata associated with it from hive,. Current behavior of Spark `` drop table command in the hive meta-store file system like a.... And deletes ` TBL_ID ` =? the metastore database ACID transaction one... Data files for internal tables, although not for external tables database but you can Schema... Table entry will delete it from metastore but the data and metadata from the file system ``. Data is … drop table statement comes with a PURGE option, configuring the table from hive metastore exception not... Schema on Read and Schema on Read and Schema on write in Hadoop Distributed file system if table. Editor everything works fine hive on your local system metadata associated with the data and from... Below example drops an employee table from hive metastore, it removes the directory associated with from! Optional if EXISTSclause makes the statement succeed whether or not the table partitions write in Hadoop, I using. Into table properties in future chapters above content browsing experience on our website hive.! Using database but you can use Schema instead remove the data structured ) from hive metastore, it the... The.Trash/Current directory to change the table so you can use Schema instead the... Ensure you have the best browsing experience on our website only the associated metadata information is removed from metastore!, we are not specifying any database name is userdb, hash-, or list-partitioned,... If PURGE is not present then we need to use “IF EXISTS” deep into properties! Now we can drop it along with the above content, as far as I can understand, PURGE.

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