by Hive. 01/01/2020 — 0 Comments. Hive. When you drop an Internal table, it drops the table from Metastore, metadata and it’s data files from the data warehouse HDFS location. Some guys have told me that's because the table has been created as an external table by the sqoop job. 08:46 PM, Here I just wanna add some points. 0 ... asked Jan 13, 2020 in Big Data | Hadoop by AdilsonLima. If the client supports it (Hive >= 0.14.0 according to the Hive docs), we should allow that option to be defined. In case of an external table, only the associated metadata information is removed from the metastore database. This command deletes the metadata and data only, not the structure. In Hive, "create table purge_test_s3 (x int) location 's3a:// [bucket] /purge_test_s3';" Use the AWS CLI or the AWS Web interface to copy files to the above mentioned location. This option is used by Hive to directly delete the files instead of moving them to the trash. Created Create a CSV file of data you want to query in Hive. Find answers, ask questions, and share your expertise. Dropping a partition from a table removes the data from HDFS and from Hive Metastore. DROP TABLE [IF EXISTS] table_name [PURGE]; Example: DROP TABLE IF EXISTS hql.customer; Underlying data of this internal table will be moved to Trash folder. Let us practice all the above mentioned one by one. cjervis. ... #hive-purge. table structure is dropped from the schema but the underlying HDFS file is not. When you run DROP TABLE on an external table, by default Hive drops only the metadata (schema). When you run Drop table command, Spark checks whether table exists or not before dropping the table. Cause. We use PURGE option when we are absolutely sure to delete the data of a table. Caution: Unless you specify the PURGE clause, the DROP TABLE statement does not result in space being released back to the tablespace for use by other objects, and the space continues to count toward the user's space quota. DDL statements create and modify database objects such as tables, indexes, and users. ... Sets the SERDE or SERDE properties in Hive tables. 4. Hive Variable Substitution. We've requested our DBA team to re-create the database because they didn't follow the same procedure as the database that works properly. See the full job below. Some common DDL statements are CREATE, ALTER, and DROP. Use the PURGE clause of DROP TABLE when dropping internal (managed) tables. For non-Hive tables, as far as I can understand, "PURGE" is the current behavior of Spark. Let us practice all the above mentioned one by one. This is usually caused by the table being an external table that doesn't allow Hive to perform all operations on it. This is a good learning experiencing for me. The issue is that the DROP TABLE statement doesn't seem to remove the data from HDFS. However, the Hive offers a lot of flexibility while creating tables from where to store data to which format to use store data. ‎05-20-2020 Another thing you can try is what's suggested in this thread (i.e. 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. Hive. Created ‎05-20-2020 Something really weird (at least for me) is happening when I drop a table in Hive. hive> DROP DATABASE IF EXISTS userdb CASCADE; The following query drops the database using SCHEMA. DROP: it drops the table along with the data associated with Hive Meta store. So it cannot be retrieved in case of an accidental DROP statement. Created on The metadata (table schema) stored in the metastore is corrupted. ‎05-28-2020 Drop table in hive with PURGE : Now if we don't use purge the table, it goes to a Trash directory, from there the table can be recovered after drop it. With DROP TABLE tableName PURGE statement, table data will not go to trash folder. But if you do . Do a query on the table first, but also check with hdfs dfs to see if the underlying files have been deleted from Hadoop (they should be). creating the same table in the schema - the number of records ingested is incorrect. Although the PURGE clause is recognized by the Spark SQL DROP TABLE statement, this clause is currently not passed along to the Hive statement that performs the drop table operation behind the … DROP table command in Hive; With DROP command, you have the flexibility to delete the data associated with the table. DROP TABLE IF EXISTS hql.customer PURGE; Underlying data in HDFS will be purged directly and table cannot be restored. ‎05-29-2020 Since the metadata is corrupted for the table Spark can’t drop the table and fails with following exception. 0 votes. Hive drop or delete partition is performed using ALTER TABLE tablename DROP command. The data is actually moved to the .Trash/Current directory if Trash is configured (and PURGE is not specified). The data is actually moved to the .Trash/Current directory if Trash is configured (and PURGE is not specified). 2.-Once the import job completes (with a select * from the source), I drop the table without issues: 3.-I run the same sqoop job again, but it not only loads the table with the fresh information from the source. boolean: functionExists (String db ... Returns the user name which is used as owner for Hive table. Syntax: TRUNCATE [TABLE] table_name [PARTITION partition_spec]; partition_spec: : … 07:01 AM. We use PURGE option when we are absolutely sure to delete the data of a table. Its syntax is as follows: DROP DATABASE StatementDROP (DATABASE|SCHEMA) [IF EXISTS] database_name [RESTRICT|CASCADE]; The following queries are used to drop a database. Created I didn't know we could add the property of a table when creating the table. Using %sql or spark.sql to drop table doesn’t work either. partition_spec. For non-Hive tables, as far as I can understand, "PURGE" is the current behavior of Spark. Hive. The hive DROP TABLE statement comes with a PURGE option. Drop or Delete Hive Partition. While running the same data step again (after deletion), i,e. Let me know what you see. You can use PURGE option to delete data file as well along with partition metadata but it works only in Internal/ Managed tables, But for External tables have a two-step process to alter table drop partition + removing file, I hope this gives some insights here. 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). format ... ('drop table temporary_table purge') I was also wondering where are going those tables because I did not see it in default database of the traditional Hive managed table … Deletes the table and removes the directory associated with the table from the file system if the table is not EXTERNAL table. We can call this one as data on schema. 10:41 AM. Immutable Table in Hive. drop table if exists table_name hive – PURGE. Data is sent to Trash and it can be recovered back in case of emergency. 12:28 PM ‎05-26-2020 Created on We use PURGE option when we are absolutely sure to delete the data of a table. It means dropping respective tables before dropping the database. In above code and from screen shot we do following things, 02:16 PM. Hive. The syntax is as follows: DROP TABLE [IF EXISTS] table_name; DBCREATE_TABLE_EXTERNAL= NO -> creates a managed table—one that is managed within the Hive warehouse. Another thing you can try is what's suggested in this thread (i.e.

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