You can truncate internal and external Hive tables in the Hadoop environment. When you issue the TRUNCATE TABLE statement, the database system deletes all rows from the table by deallocating the data pages allocated by the table. Thus in this article, we have studied how to create a database, drop a database, alter a database, etc. Truncate Hive target tables to delete the table contents. The same functionality can be achieved by using TRUNCATE TABLE (for non-partitioned tables) or DROP PARTITION followed by INSERT INTO. This could improve the performance of INSERT OVERWRITE TABLE queries especially when there are large number of partitions on tables located on S3 should the user wish to set auto.purge property to true. Among several Hive DDL Commands, here I will be covering the most commonly used DDL commands.. DDL commands are used to create databases, tables, modify the structure of the table, and drop the database and tables e.t.c. Syntax: TRUNCATE TABLE table_name; DDL TRUNCATE TABLE Example: Summary. While move operations are not very costly on HDFS it could be significant overhead on slow FileSystems like S3. The TRUNCATE command removes all rows from the table as well as from the partition, but keeps the table structure as it is. By doing this, the RDBMS can reduce the resources for logging and the number of locks that need to acquire. Turn on suggestions. Solved: Hi All, Can we truncate partition external table ? Truncating a table in Hive is indirectly removing the files from the HDFS as a table in Hive is just a way of reading the data from the HDFS in the table or structural format. Many users can simultaneously query the data using Hive-QL. Hive is used because the tables in Hive are similar to tables in a relational database. Hive DDL Database Commands. This hive command is used to truncate all the rows present in a table i.e. Before you proceed make sure you have HiveServer2 started and connected to Hive using Beeline. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. TRUNCATE Table Command in Hive. TRUNCATE TABLE [db_name].table_name Usage of TRUNCATE Table in Hive. I believe this is because you have designated your Hive table as EXTERNAL. TRUNCATE TABLE. Truncate a Hive table in the Hive table properties. it deletes all the data from the Hive meta store and the data cannot be restored. If you are familiar with SQL, it’s a cakewalk. Support Questions Find answers, ask questions, and share your expertise cancel. External tables are most often used to manage data directly on HDFS that is loaded as CSV files, etc. 6. To truncate multiple tables at a time, you can use a list of comma-separated table names after the TRUNCATE TABLE clause as follows: The following image shows the Hive table properties: To truncate the entire Hive table, choose the option to truncate the target table. TRUNCATE TABLE statement in Hive removes all the rows from the table or partition. ALTER Table Command in Hive. – vikrant rana May 20 '19 at 14:27 2 @vikrantrana truncate works only for managed tables, not external. hive> truncate table. Reply. @leftjoin- when we set 'EXTERNAL'='FALSE' for an external table, will it move the file location date to hive warehouse or it just help us to truncate the table. Sharing an example where i faced the issue . So it's necessary for to enhance the syntax like "TRUNCATE TABLE srcpart_truncate PARTITION (dt='201130412') FORCE;" to remove data from EXTERNAL table. Your search results by suggesting possible matches as you type HDFS that is loaded CSV! 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