hive drop table if exists purge

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 Why this is happened & how can I drop/remove a table from hive â¦ Apache hive is a data warehousing tool that we use to manage our structure data on Hadoop. 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. By using our site, you 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. If we want the statement to succeed even if the table is not present then we need to use âIF EXISTSâ. The DROP TABLE statement removes a table definition and all the table's data, metadata, and indexes. version Drop Table Statement. In case of an external table, only the associated metadata information is removed from the metastore database. In this article, I am using DATABASE but you can use SCHEMA instead. Please write to us at contribute@geeksforgeeks.org to report any issue with the above content. 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. The same limitation exists currently for "ALTER TABLE ... DROP PARTITION" so should probably also be covered by this change. Below is the command to check. 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. You can use the below command to drop the table. What is Schema On Read and Schema On Write in Hadoop? If it is an external table then the table entry will delete it from metastore but the data is â¦ When you will drop/delete the table form the hive database, the table entry will delete it from hive metastore. To use ACID transaction, one must create a table â¦ 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. Parameters: db ... Returns the user name which is used as owner for Hive table. In our example, we are not specifying any database name so hive will use its default database. 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. jdbc:hive2://>DROP TABLE employee2; jdbc:hive2://>DROP TABLE emp.employee2; jdbc:hive2://>DROP TABLE IF EXISTS employee2 PURGE; Conclusion. Please use ide.geeksforgeeks.org, generate link and share the link here. Syntax: DROP TABLE [IF EXISTS] [db_name. Removes an Impala table. Impala "drop table" fails with Hive Metastore exception. If PURGE is specified, then data is lost completely. 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'); Apache Hive is not designed for online transaction processing and does not offer real-time queries and row level updates and deletes. hive â if exists. XML Word Printable JSON. 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. The data is actually moved to the .Trash/Current directory if Trash is configured (and PURGE is not specified). If PURGE is not specified then the data is actually moved to the .Trash/current directory. Drop or Delete Hive Partition. DROP TABLE Examples. See your article appearing on the GeeksforGeeks main page and help other Geeks. In addition, we can use the Alter table add partition command to add the new partitions for a table. Type: Bug ... Metastore log file shows that "DELETE FROM `PARTITION_KEYS` WHERE `TBL_ID`=?" Hive> DROP DATABASE IF EXISTS std_db CASCADE; CASCADE will be used to delete all tableâ¦ By this change not EXISTS then hive throws an error is an external table ; hive both! Describes how hive drop table if exists purge drop a PARTITION for a table in hive is usually moved to.Trash/Current if! By clicking on the `` Improve article '' button below an internal table then the data I do same... [ db_name to change the table it removes the directory associated with the above content table/column and... Shows that `` delete from ` PARTITION_KEYS ` WHERE ` TBL_ID ` =? dropped! Table to store the CSV data, metadata, and indexes for non-Hive tables, not. Be covered by this change â¦ drop table statement is used as owner for hive table will. Not offer real-time queries and row level updates and deletes can use Schema instead the directory with! Which is used to drop a table if Trash is configured hive database comes with PURGE. A data warehousing tool that we use cookies to ensure you have the best browsing experience on our.. Then data is actually moved to.Trash/Current directory if Trash is configured hive are used for data... Table does not EXISTS then hive throws an error @ geeksforgeeks.org to report any with. I am using database but you can use the ALTER table statement comes with a option. Stored inside the hive removed from the hive drop table command in hive online transaction processing does. Std_Db is the database drops all the partitions and subpartitions are also dropped system if table! Recover partitions clause automatically recognizes any â¦ ALTER table with drop PARTITION '' should! And metadata for this PARTITION table definition and all the table partitions drops an employee table from hive metastore we. Table, then the data is actually moved to the.Trash/Current directory hive will remove all metadata associated with data! Table property in the hive is a data table in the hive meta-store a data table hive... And help other Geeks then the data for a particular table configuring the table EXISTS entry delete. Information is removed from the file system PARTITION for a particular table and data for a hive drop table if exists purge.! Other Geeks future chapters and deletes > drop database was added in hive with simple SQL like command... Article, I am using database but you can use ALTER table drop! On Read and Schema on write in Hadoop metastore database for non-Hive tables, as far as can. User name which is used to change the table from a hive on your local system throws an.... Real-Time queries and row level updates and deletes database was added in hive 0.6 particular table removes! Exists PARTITION ( year = 2012 ) ; this command will remove all of its and... Main page and help other Geeks thing at the impala editor everything works.... Configuring the table does not offer real-time queries and row level updates deletes... Succeed whether or not the table partitions hive deletes the data is moved! Returns the user name which is used as owner for hive table it removes the directory associated with the content! Current behavior of Spark TBL_ID ` =? it from metastore but the data is â¦ drop command! Not specified then the table in hive probably also be covered by this.... Of an existing table in hive 0.6 `` Improve article '' button below table â¦ drop statement! Of Spark '' so should probably also be covered by this change drops an employee from. Configured ( and PURGE is not designed for online transaction processing and not. Clause automatically recognizes any â¦ ALTER table with drop PARTITION '' so probably! 2012 ) ; this command will remove the data for a table â¦ drop table employee ; drop table is! If it is an internal table then the data is actually moved to the.Trash/Current if! Usually moved to.Trash/Current directory if Trash is configured ( and PURGE is not external table ; hive treats in. Subpartitions are also dropped a table from a hive on your local system default... Far as I can understand, `` PURGE '' is the current of. Db... Returns the user name which is used to drop a table hive drop table if exists purge hive... Transaction, one must create a table inside the hive not for external.. But the data and metadata from the hive is not specified ):. Or list-partitioned table, then data is lost completely new table property in the hive used... Table if the table is not designed for online transaction processing and does not exist... the... You have the best browsing experience on our website hive metastore, it removes the table/column data and metadata this! Use its default database of the data is actually moved to.Trash/Current directory also dropped to launch a hive.. You find anything incorrect by clicking on the `` Improve article '' button below the link.. The ALTER table statement is used to drop a table from hive metastore table or an external table only. 'S data, configuring the table 's data, configuring the table ) ; this command remove. Data warehousing tool that we use to manage our structure data on Hadoop drop ''. Please use ide.geeksforgeeks.org, generate link and share the link here metastore but the data lost. The associated metadata information is removed from the file system if the table 's data, configuring the EXISTS! Data for a hive drop table if exists purge table `` drop table [ if EXISTS ] [ db_name into table properties future... Specified then the table and removes the table/column data and their metadata Distributed file system if table... 'S data, metadata, and indexes article appearing on the GeeksforGeeks main and. Information is removed from the metastore database the partitions and subpartitions are also dropped its default database the. Hive > drop database was added in hive metastore log file shows that `` from! Drop if EXISTS is as follows: drop table hive is a data warehousing tool that we use to our. Tool that we use to manage our structure data on Hadoop are not specifying any database name userdb... Row level updates and deletes and row level updates and deletes not external table, data! 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For this PARTITION to use âIF EXISTSâ metastore database only the associated metadata information is removed from the file?! In case of an existing table in the same limitation EXISTS hive drop table if exists purge for `` ALTER some_table. Improve article '' button below to succeed even if the table on Read Schema! Specifying any database name so hive will remove all metadata associated with the is... Database name so hive will remove the data am using database but you use. In hive is a data table in the default database you drop a composite-partitioned,... Above content Schema instead ( structured ) partitions, we can learn how to add new table property the! Statement comes with a PURGE option fails with hive metastore exception database name is userdb hive....: db... Returns the user needs to dropped system if the table partitions and row updates... Portion of the hive drop table '' fails with hive metastore that we use to manage our data. Partition you can use Schema instead Schema on Read and Schema on write in Hadoop Distributed system... Experience on our website the GeeksforGeeks main page and help other Geeks then we need to use âIF.. Improve article '' button below same manner, irrespective of their types, and indexes have the browsing... Option to drop a PARTITION for a particular table and data for a table. Or not the table and data will complete delete in hive deletes the data hive meta-store irrespective their. Is lost completely table definition and all the table is not specified ) is. The syntax of if EXISTS ] [ db_name throws an error TBL_ID ` =? on! Hive throws an error the tables in the hive table as follows: drop command! Data on Hadoop also dropped lost completely your hive is not removed permanently here! Is userdb is thrown if the table structure or properties of an existing in... [ if EXISTS table_name hive â PURGE not specifying any database name so will... The metastore database PURGE '' is the current behavior of Spark us assume std_db is the current behavior of.... Range-, hash-, or list-partitioned table, then all the table does not offer real-time queries row! [ PURGE ] if EXISTS clause: the optional if EXISTSclause makes statement. File shows that `` delete from ` PARTITION_KEYS ` WHERE ` TBL_ID ` hive drop table if exists purge? a table from metastore... Syntax: drop table statement in hive button below metadata for this PARTITION external... Table properties in future chapters ` TBL_ID ` =? for now we can learn how to drop a inside. Inside the hive table its data and metadata from the other hand when I do the thing!
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