Hive is used because the tables in Hive are similar to tables in a relational database. To truncate multiple tables at a time, you can use a list of comma-separated table names after the TRUNCATE TABLE clause as follows: Turn on suggestions. Syntax: TRUNCATE TABLE table_name; DDL TRUNCATE TABLE Example: Summary. TRUNCATE TABLE. Support Questions Find answers, ask questions, and share your expertise cancel. ALTER Table Command in Hive. While move operations are not very costly on HDFS it could be significant overhead on slow FileSystems like S3. Hive DDL Database Commands. The same functionality can be achieved by using TRUNCATE TABLE (for non-partitioned tables) or DROP PARTITION followed by INSERT INTO. Many users can simultaneously query the data using Hive-QL. You can truncate internal and external Hive tables in the Hadoop environment. By doing this, the RDBMS can reduce the resources for logging and the number of locks that need to acquire. If you are familiar with SQL, it’s a cakewalk. Sharing an example where i faced the issue . hive> truncate table. TRUNCATE TABLE statement in Hive removes all the rows from the table or partition. Solved: Hi All, Can we truncate partition external table ? The TRUNCATE command removes all rows from the table as well as from the partition, but keeps the table structure as it is. 6. Before you proceed make sure you have HiveServer2 started and connected to Hive using Beeline. Reply. This hive command is used to truncate all the rows present in a table i.e. Thus in this article, we have studied how to create a database, drop a database, alter a database, etc. – vikrant rana May 20 '19 at 14:27 2 @vikrantrana truncate works only for managed tables, not external. 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. The following image shows the Hive table properties: To truncate the entire Hive table, choose the option to truncate the target table. Truncate a Hive table in the Hive table properties. 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. So it's necessary for to enhance the syntax like "TRUNCATE TABLE srcpart_truncate PARTITION (dt='201130412') FORCE;" to remove data from EXTERNAL table. I believe this is because you have designated your Hive table as EXTERNAL. it deletes all the data from the Hive meta store and the data cannot be restored. 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. TRUNCATE TABLE [db_name].table_name Usage of TRUNCATE Table in Hive. 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