By using our site, you The data is actually moved to the .Trash/Current directory if Trash is configured (and PURGE is not specified). If it is an external table then the table entry will delete it from metastore but the data is … We can drop the table in hive with simple SQL like a command. The same limitation exists currently for "ALTER TABLE ... DROP PARTITION" so should probably also be covered by this change. Also removes the underlying HDFS data files for internal tables, although not for external tables. Types of Drop Table in Hive. To use ACID transaction, one must create a table … Below is the command to check. DROP TABLE [IF EXISTS] table_name [PURGE]; Usage of DROP Table command in Hive . 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. If PURGE is specified, then data is lost completely. Apache Hive is not designed for online transaction processing and does not offer real-time queries and row level updates and deletes. Drop or Delete Hive Partition. If it is an internal table then the table and data will complete delete. XML Word Printable JSON. 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 RECOVER PARTITIONS clause automatically recognizes any … Hive will remove all of its data and metadata from the hive meta-store. Export. Why this is happened & how can I drop/remove a table from hive … For non-Hive tables, as far as I can understand, "PURGE" is the current behavior of Spark. To perform the below operation make sure your hive is running. 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 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. Syntax: DROP TABLE [IF EXISTS] [db_name. DROP TABLE Examples. 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. hive – if exists. ]table_name[PURGE] IF EXISTS clause: The optional IF EXISTSclause makes the statement succeed whether or not the table exists. Experience. 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 … Using partitions, we can query the portion of the data. 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. Please write to us at contribute@geeksforgeeks.org to report any issue with the above content. What is Schema On Read and Schema On Write in Hadoop? Removes an Impala table. The syntax is as follows: DROP TABLE [IF EXISTS] table_name; 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. Drops the table and all the data associated with it in the Hive metastore. Impala "drop table" fails with Hive Metastore exception. When you drop a range-, hash-, or list-partitioned table, then the database drops all the table partitions. (For example, if an abnormal server exit occurs after removal of the table from the storage engine but … Example 2 - Error that occurs when using DROP TABLE without the IF EXISTS clause DROP TABLE command in the hive is used to drop a table inside the hive. See your article appearing on the GeeksforGeeks main page and help other Geeks. 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'); The syntax of IF EXISTS is as follows: drop table if exists table_name hive – PURGE. 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. In our example, we are not specifying any database name so hive will use its default database. If PURGE is not specified then the data is actually moved to the .Trash/current directory. You can use ALTER TABLE with DROP PARTITION option to drop a partition for a table. From the other hand when I do the same thing at the impala editor everything works fine. ALTER TABLE some_table DROP IF EXISTS PARTITION (year = 2012); This command will remove the data and metadata for this partition. Deletes the table and removes the directory associated with the table from the file system if the table is not EXTERNAL table. 4. 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. 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. For non-Hive tables, as far as I can understand, "PURGE" is the current behavior of Spark. Let us assume that the database name is userdb. DROP table command removes the metadata and data for a particular table. An exception is thrown if the table does not exist. Log In. 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. You can use the below command to drop the table. Parameters: db ... Returns the user name which is used as owner for Hive table. 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. 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. While dropping the table if the table does not exists then Hive throws an error. Hive DELETE FROM Table Alternative. How Does Namenode Handles Datanode Failure in Hadoop Distributed File System? Hive> DROP DATABASE IF EXISTS std_db CASCADE; CASCADE will be used to delete all table… 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. When you delete a file/folder it is not removed permanently . DROP DATABASE was added in Hive 0.6. 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