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. Use the ALTER TABLE ADD PARTITION statement to add a new partition to the "high" end (the point after the last existing partition). The example that follows deletes a partition of the. the ALTER TABLE DROP PARTITION always returns the space back to the tablespace for reuse by other segments. Drop Partition To drop a partition from Range Partition table, List Partition or Composite Partition table give the following command. Other versions of this page: The ALTER TABLE… DROP PARTITION command deletes a partition and any data stored on that partition. User Guides → Database Compatibility for Oracle® Developer’s Guide For example, to drop the first partition, issue the following statements: This method is most appropriate for small tables, or for large tables when the partition being dropped contains a small percentage of the total data in the table. Issue the ALTER TABLE DROP PARTITION statement without maintaining global indexes. When you delete a partition, any subpartitions (of that partition) are deleted as well. Instead, a drop operation on a parent table cascades to all descendant tables. If index sales_area_ix were a range-partitioned global index, then all partitions of the index would require rebuilding. If you need more clarification you can reach me at dss.rams@gmail.com. Method 1. DROP PARTITION command deletes a partition and any data stored on that partition. Further, it is not possible to rebuild all partitions of an index in one statement. Scripting on this page enhances content navigation, but does not change the content in any way. All rights reserved. To use the DROP SUBPARTITION clause, you must be the owner of the partitioning root, a member of a group that owns the table, or have superuser or administrative privileges. The name (optionally schema-qualified) of the partitioned table. acctg=# SELECT partition_name, server_name, high_value FROM ALL_TAB_PARTITIONS; partition_name | server_name | high_value, ----------------+-------------+---------------------, europe | seattle | 'FRANCE', 'ITALY', asia | chicago | 'INDIA', 'PAKISTAN', americas | boston | 'US', 'CANADA', To delete the americas partition from the. 9.6. © 2020 EnterpriseDB Corporation. Subscribe to get advanced Postgres how-tos. If you are not the owner of the table, then you need the DROP ANY TABLE privilege in order to use the drop_table_partition or truncate_table_partition clause. This method is most appropriate for large tables where the partition being dropped contains a significant percentage of the total data in the table. 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. Doing so leverages the new asynchronous global index maintenance. PARTITION asia VALUES('INDIA', 'PAKISTAN'), PARTITION americas VALUES('US', 'CANADA'). For hash partitioned tables, or hash subpartitions of composite *-hash partitioned tables, you must perform a coalesce operation instead. ALTER TABLE sales DROP PARTITION americas. ALTER TABLE sales DROP PARTITION americas. Afterward, you must rebuild any global indexes (whether partitioned or not) because the index (or index partitions) has been marked … All rights reserved. |, EDB Postgres MongoDB Foreign Data Wrapper, 10.3 Partitioning Commands Compatible with Oracle Databases. PARTITION asia VALUES('INDIA', 'PAKISTAN'), PARTITION americas VALUES('US', 'CANADA'). You must issue a separate REBUILD statement for each partition in the index. 9.6 → Issue the DELETE statement to delete all rows from the partition before you issue the ALTER TABLE DROP PARTITION statement. It is the ALTER TABLE TRUNCATE PARTITION, where you can either specify DROP STORAGE or REUSE STORAGE clause (in case of reuse, the space is not freed and can be used only by new rows inserted in the same partition). Issue the ALTER TABLE DROP PARTITION statement without maintaining global indexes. Indexes remain valid. The following statements provide an example of dropping partition dec98 from the sales table, then rebuilding its global nonpartitioned index. 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. Is it possible in SQL server? Specify UPDATE INDEXES in the ALTER TABLE statement. Other versions of this page: EDB Postgres Advanced Server → The DELETE statement updates the global indexes. ALTER TABLE sales DROP PARTITION 2; ALTER TABLE sales DROP PARTITION 4;-----ALTER TABLE sales TRUNCATE PARTITION 2; ALTER TABLE sales TRUNCATE PARTITION 4;-----The above statements are valid in Oracle. PARTITION europe VALUES('FRANCE', 'ITALY'). You cannot drop a partition from a reference-partitioned table. The following statements rebuild the index partitions jan99_ix to dec99_ix. Subscribe to get advanced Postgres how-tos. The name (optionally schema-qualified) of the partitioned table. 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. © 2020 EnterpriseDB Corporation. the alter table… DROP SUBPARTITION command deletes a subpartition, and the data stored in that subpartition. When you delete a partition, any subpartitions (of that partition) are deleted as well. |, EDB Postgres MongoDB Foreign Data Wrapper, 13.3 Partitioning Commands Compatible with Oracle Databases. While asynchronous global index maintenance keeps global indexes valid without the need of any index maintenance, you must use the UPDATE INDEXES clause to enable this new functionality. acctg=# SELECT partition_name, server_name, high_value FROM ALL_TAB_PARTITIONS; partition_name | server_name | high_value, ----------------+-------------+---------------------, europe | seattle | 'FRANCE', 'ITALY', asia | chicago | 'INDIA', 'PAKISTAN', americas | boston | 'US', 'CANADA', To delete the americas partition from the. 9.5 → Afterward, you must rebuild any global indexes (whether partitioned or not) because the index (or index partitions) has been marked UNUSABLE. User Guides → Database Compatibility for Oracle® Developer’s Guide The example that follows deletes a partition of the. This behavior ensures backward compatibility. You must also have space quota in the tablespace in which space is to be acquired in order to use the add_table_partition , modify_table_partition , move_table_partition , and split_table_partition clauses.

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