ALTER TABLE table_name DROP [IF EXISTS] PARTITION partition_spec; hadoop fs -rm -r Details. show partitions table_name; So right now we have 5 partitions on a table part_dept1. Note: Data moving to .Trash directory happens only for Internal/Managed table. hadoop,hive,partition. The following syntax is used to drop a partition: Hive - Alter Table. This is supported only for tables created using the Hive format. Dropping a partition from a table removes the data from HDFS and from Hive Metastore. hive alter table drop partition example. let’s rename partition state=’NY’ back to it’s original state=’AL’. Drop Partition. Export. ');-- DROP TABLE PROPERTIES ALTER TABLE dbx. The below example update the state=NC partition location from the default Hive store to a custom location /data/state=NC. Type: Sub-task Status: Resolved. We use cookies to ensure that we give you the best experience on our website. Running SELECT command on the table doesn’t show the records from removed partitions, however, SHOW PARTITIONS still shows the deleted partitions. You can use the PURGE option to not move the data to .Trash directory, the data will be permanently removed and it can not be recovered. ALTER TABLE foo DROP PARTITION(ds < 'date') This task is to implement ALTER TABLE DROP PARTITION for all of the comparators, < > <= >= <> = != instead of just for =. Add PARTITION after creating TABLE in hive. Hive - Alter Table - This chapter explains how to alter the attributes of a table such as changing its table name, changing column names, adding columns, and deleting or replacing c Internal tables Internal Table is tightly coupled in nature.In this type of table, first we have to create table and load the data. I run this to drop the table: ALTER TABLE table_name drop col_name; but I am getting ... expecting PARTITION near 'drop' in drop partition statement 30475/hadoop-hive-how-to-drop-a-table … Rename a Table. Did you try to drop the partition using Hive query ? 5. );-- Alter TABLE COMMENT Using SET PROPERTIES ALTER TABLE dbx. For each distinct value of the partition key, a subdirectory will be created on HDFS. hive> alter table testpart drop partition (partcol=3); Dropped the partition partcol=3 OK Time taken: 0.751 seconds . Not doing so will result in inconsistent results. POSTHOOK: query: ALTER TABLE encrypted_table_dp DROP PARTITION (p='2014-09-23') PURGE POSTHOOK: type: ALTERTABLE_DROPPARTS POSTHOOK: Input: default@encrypted_table_dp ALTER TABLE SET command is used for setting the SERDE or SERDE properties in Hive tables. hive> alter table testpart drop partition (partcol=3); Dropped the partition partcol=3 OK Time taken: 0.751 seconds. If you continue to use this site we will assume that you are happy with it. If we want to change the name of an existing table, we can rename that table by using the following signature: - Below script drops … This operation is allowed only for tables created using the Hive format. 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. Then we partition and store the data according to the year. 5. We use analytics cookies to understand how you use our websites so we can make them better, e.g. This removes the data and metadata for this partition. The data is actually moved to the .Trash/Current directory if Trash is configured, unless PURGE is specified, but the metadata is completely lost (see LanguageManual DDL#Drop Table above). Hive partitions the table, such as by date, city, etc., which can improve the query speed. The ALTER TABLE … DROP PARTITION command can drop partitions of a LIST or RANGE partitioned table; please note that this command does not work on a HASH partitioned table. In this article, you have learned how to update, drop or delete hive partition using ALTER TABLE command, and also learned using SHOW PARTITIONS to show the partitions of the table, using MSCK REPAIR to synch Hive Metastore with the HDFS data. ALTER TABLE in Hive. tab1 UNSET TBLPROPERTIES ('winner'); Sitemap, Hadoop Hive Table Dynamic Partition and Examples, Hive Insert into Partition Table and Examples, How to Exclude Hive Partition Column From SELECT Query. When you delete a partition, any subpartitions (of that partition) are deleted as well. HIVE-8065 Support HDFS encryption functionality on Hive; HIVE-10910; Alter table drop partition queries in encrypted zone failing to remove data from HDFS. However, beginning with Spark 2.1, Alter Table Partitions is also supported for tables defined using the datasource API. The first thing that comes to mind if if we can show multiple tables using LIKE then can we DROP multiple tables as well. ALTER TABLE foo DROP PARTITION(ds < 'date') This task is to implement ALTER TABLE DROP PARTITION for … If you need these to be dynamic then you can use ' --hivevar date1=xxxxx ' for it. As of now this is not possible in HIVE. Log In. You can use online redefinition to copy nonpartitioned Collection Tables to partitioned Collection Tables and Oracle Database inserts rows into the appropriate partitions in the Collection Table. To drop a partition from a Hive table, this works: ALTER TABLE foo DROP PARTITION(ds = 'date')...but it should also work to drop all partitions prior to date. Hive – How to Show All Partitions of a Table? Add partitions to the table, optionally with a custom location for each partition added. Dropping a Partition Syntax is - alter table table_name drop partition (partition_name); Please note - since this part_dept1 table was internal table, hence both data and metadata… However, depending on on the partition column type, you might not be able to drop those partitions due to restrictions in the Hive code. hadoop,hive,partition. You can recover this data post drop if needed. The ALTER TABLE statement in Hive enables you to change the structure of an existing table. With Alter table command, we can also update partition table location. Example 4-35 illustrates how this is done for nested tables inside an Objects column; a similar example works for Ordered Collection Type Tables inside an XMLType table or column. ALTER TABLE some_table DROP IF EXISTS PARTITION (year = 2012); This command will remove the data and metadata for this partition. Below script drops all partitions from sales table with year greater than 2019. This behavior can be changed using IF EXISTS optional clause; where it executes the drop partitions only when the partition present in the Hive table. Before you proceed make sure you have HiveServer2 started and connected to Hive using Beeline. It provides SQL like commands to alter the table. hive> ALTER TABLE sales drop if exists partition (year = 2020, quarter = 1), partition (year = 2020, quarter = 2); Here is how we dynamically pick partitions to drop. You can use the Hive ALTER TABLE command to change the HDFS directory location of a specific partition. 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. We know that Hive will create a partition with value “__HIVE_DEFAULT_PARTITION__” when running in dynamic partition mode and the value for the partition key is “null” value. Let’s say you have a large table with a state column and you often required to run analytics-related queries for each state hence, the state column is qualified to be a partition column. The answer sadly is no. ALTER TABLE log_messages PARTITION (year = 2019, month = 12) SET LOCATION '/maheshmogal.db/order_new/year=2019/month=12'; 1. Hive DDL Database Commands. The following table contains the fields of employeetable and it shows the fields to be changed (in bold). Hive> ALTER TABLE std_details DROP [IF EXISTS] PARTITION (std_class=’1’); Once the above statement successfully executed, the partition deleted on std_db.std_details table. The following queries rename the column name and column data type using the above data: If Trash is configured by setting true to hive.warehouse.data.skipTrash property, dropping a Hive partition moves the partition data to users .Trash directory. https://sparkbyexamples.com/apache-hive/hive-update-or-drop-hive-partition The syntax is as below. When dropping a partition that doesn’t exist, it returns an error. Updating & Renaming Partitions in Hive Tables. How to Load Local File to Azure Synapse using BCP? The ALTER TABLE… DROP PARTITION command deletes a partition and any data stored on that partition. With the below alter script, we provide the exact partitions we would like to delete. Priority: Major . Partition key could be one or multiple columns. The below example rename partition state=’AL’ to state=’NY’, Alternatively, you can also rename the partition directory on the HDFS. Above command synchronize zipcodes table on Hive Metastore. ALTER TABLE table_name DROP [IF EXISTS] (PARTITION part_spec,...) part_spec:: (part_col_name1 = val1, part_col_name2 = val2,...) Drop a partition from a table or view. In order to fix this, you need to run MSCK REPAIR TABLE as shown below. Hive – What is Metastore and Data Warehouse Location? Hive drop or delete partition is performed using ALTER TABLE tablename DROP command. You can also delete the partition directly from HDFS using below command. How to start HiveServer2 and Using Beeline, Difference between Internal Managed Table and External Table, https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL, Hive List or Show All Partitions of a Table, How to Set Variables in Hive Scripts Examples, How to connect to Hive from Java & Scala Examples. ALTER TABLE some_table DROP IF EXISTS PARTITION(year = 2012); This command will remove the data and metadata for this partition. tab1 SET TBLPROPERTIES ('comment' = 'This is a new comment. DROP TABLE [IF EXISTS] table_name [PURGE]; DDL DROP TABLE Example: In the below example, we are deleting the ‘employee’ table. Above example permanently drops state=AL partition. Method 1. Then check mysql again, it is gone finally. Dropping Hive Partition is pretty straight forward just remember that when you drop partition of an internal table then the data is deleted but when you drop from an external table the data remains as it is in the external location. If the partition contains data and one or more global indexes are defined on the table, then use one of the following methods (method 1, 2 or 3) to drop the table partition. Drop or Delete Hive Partition You can use ALTER TABLE with DROP PARTITION option to drop a partition for a table. Azure Synapse INSERT with VALUES Limitations and Alternative. drop table table_name purge hive – drop multiple tables in hive. Hive deals with two types of table structures like Internal and External tables depending on the loading and design of schema in Hive. In addition, we can use the Alter table add partition command to add the new partitions for a table. Before altering partitions, let's see how many Partitions we have in our Partitioned table. Partitioning in Hive 32 . You can use ALTER TABLE DROP PARTITION to drop a partition for a table. alter table tbl_nm drop if exists partition (col = ‘value’ , …..) You can also use ALTER TABLE with PARTITION RENAME to rename the Hive partition. alter table historical_data drop partition (year < 1995, last_name like 'A%'); This technique can also be used to change the file format of groups of partitions, as part of an ETL pipeline that periodically consolidates and rewrites the underlying data files in a different file format: Drop or Delete Hive Partition. It should look like this : ALTER TABLE DROP PARTITION (=''); https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-DropPartitions . ALTER table DROP Partition. How to drop Hive’s default partition (__HIVE_DEFAULT_PARTITION__) with “int” partition column ; Hive “INSERT OVERWRITE” Does Not Remove Existing Data ; Unable to query Hive parquet table after altering column type ; Load Data From File Into Compressed Hive Table ; How to ask Sqoop to empty NULL valued fields when importing into Hive Hive ALTER TABLE command is used to update or drop a partition from a Hive Metastore and HDFS location (managed table). Now run the show partition command which shows state=AL partition. For the external table, DROP partition just removes the partition from Hive Metastore and the partition is still present on HDFS. ALTER TABLE myTable DROP PARTITION (date < 'date1') , PARTITION (date >'date2'); It needs literals for 'date1' and 'date2'. they're used to gather information about the pages you visit and how many clicks you need to accomplish a task. 2 ALTER Table Drop Partition in Hive ALTER TABLE ADD PARTITION in Hive Alter table statement is used to change the table structure or properties of an existing table in Hive. ALTER TABLE table_name PARTITION partition_spec RENAME TO PARTITION partition_spec; The following query is used to rename a partition: hive> ALTER TABLE employee PARTITION (year=’1203’) > RENAME TO PARTITION (Yoj=’1203’); Dropping a Partition. Analytics cookies. If you need to drop all tables then the easiest way is to drop the database . How to Export Azure Synapse Table to Local CSV using BCP? Issue the ALTER TABLE DROP PARTITION statement without maintaining global indexes. ALTER table DROP Partition. 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The RECOVER PARTITIONS clause automatically recognizes … Drop Partitions 删除分区 ALTER TABLE table_name DROP [IF EXISTS] PARTITION partition_spec [, PARTITION partition_spec,...] [IGNORE PROTECTION] [PURGE];-- (Note: PURGE available in Hive 1.2.0 and later, IGNORE PROTECTION not available 2.0.0 and later) 你可以使用 ALTER TABLE DROP PARTITION 删 … You can also manually update or drop a Hive partition directly on HDFS using Hadoop commands, if you do so you need to run the MSCK command to synch up HDFS files with Hive Metastore. Add PARTITION after creating TABLE in hive. Then check mysql again, it is gone finally. Hive partition breaks the table into multiple tables (on HDFS multiple subdirectories) based on the partition key. As of version 0.9.0 you can use comparators in the drop partition statement which may be used to drop all partitions at once.. An example, taken from the drop_partitions_filter.q testcase :. Below command to drop the partition already created. 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. First create a table in such a way so that you don't have partition column in the table. To drop a partition from a Hive table, this works: ALTER TABLE foo DROP PARTITION(ds = 'date')...but it should also work to drop all partitions prior to date. ALTER TABLE orders DROP PARTITION (dt = '2014-05-14', country = 'IN'), PARTITION (dt = '2014-05-15', country = 'IN'); You need to run explicitly hadoop fs -rm commnad to remove the partition from HDFS. In order to explain update and drop Hive partition let’s assume you have a zipcodes table with the below data. mysql> select * from PARTITIONS where TBL_ID= (select TBL_ID from TBLS where TBL_NAME='testpart'); First create a table in such a way so that you don't have partition column in the table. When you manually modify the partitions directly on HDFS, you need to run MSCK REPAIR TABLE to update the Hive Metastore. hive> ALTER TABLE sales drop if exists partition (year = 2020, quarter = 1), partition (year = 2020, quarter = 2); Here is how we dynamically pick partitions to drop. The following syntax is used to drop a partition: ALTER TABLE table_name DROP [IF EXISTS] PARTITION partition_spec, PARTITION partition_spec,...; The following query is used to drop a partition: hive> ALTER TABLE employee DROP [IF EXISTS] > PARTITION (year=’1203’); You can use ALTER TABLE with DROP PARTITION option to drop a partition for a table.
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