You can remove multiple partitions or subpartitions from a range or list partitioned table with the DROP PARTITION and DROP SUBPARTITION clauses of the ALTER TABLE statement. Create or Drop of Partition in Oracle Creation of Partition For adding more partition in existing partition table. ALTER TABLE trans DROP partition y05q1 UPDATE global indexes; If you decide not to do an automatic index update as part of dropping the partition, that global index will become unusable. 1. ALTER TABLE … TRUNCATE PARTITION will not cause ON DELETE triggers that might exist for the table to fire, but it will fire ON TRUNCATE triggers. ALTER TABLE partitioning. Check the table space and file_name already present for partition. This Oracle tutorial explains how to use the Oracle ALTER TABLE statement to add a column, modify a column, drop a column, rename a column or rename a table (with syntax, examples and practice exercises). When you drop a partition, the corresponding local index partitions also are dropped. You will have to rebuild the index to make it usable, but you can defer that task to later, after you've dropped other partitions or done some other operations. column tablespace_name format a25 column file_name format a45 column… Any global non-partitioned indexes or any portions of global partitioned indexes with reference to the rows that existed in the partition are marked as unusable. If you are using Oracle 12c Release 2 you could use single ALTER to convert non-partitioned table to partitioned one (this is one way trip): CREATE TABLE my_tab ( a NUMBER(38,0), b NUMBER(38,0)); ALTER TABLE MY_TAB MODIFY PARTITION BY RANGE (a) INTERVAL (1000) ( PARTITION p1 VALUES LESS THAN (1000)) ONLINE; The ALTER TABLE… DROP PARTITION command deletes a partition and any data stored on that partition. You cannot use the ALTER TABLE … ADD PARTITION statement to add a partition to a table with a MAXVALUE or DEFAULT rule. 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. 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).

For example, the statement in the example shown below drops multiple partitions from the Range-partitioned table, sales. Note that you can alternatively use the ALTER TABLE … SPLIT PARTITION statement to split an existing partition, effectively increasing the number of partitions in a table.

Oracle / PLSQL: ALTER TABLE Statement. The statement is always executed with validation, meaning that it checks to see if any rows exist in the partition that correspond to the set of values being dropped. Syntax: ALTER TABLE [schema. Hi, the ALTER TABLE DROP PARTITION always returns the space back to the tablespace for reuse by other segments. If an ON TRUNCATE trigger is defined for the partition, all BEFORE TRUNCATE triggers are fired before any truncation happens, and all AFTER TRUNCATE triggers are fired after the last truncation occurs. Need to follow following steps.

You can drop a partition and its data with the command ALTER TABLE DROP PARTITION partition_name.

Tom We have a procedure p which drops a partition and adds a partition to a partitioned table t every day, and then the current days data from table t1 is inserted into t( we are not doing exchange partitions due to some business conditions, the table t is being inserted records via a trigger).

It help to add next year partition Example is for monthly wise.

DROP VALUES clause of the ALTER TABLE statement to remove literal values from the value list of an existing partition. Change the partition properties of an existing table.

When you delete a partition, any subpartitions (of that partition) are deleted as well.