Oracle cleans up the Database disk space of tables with referenced partitions

A database system is more fancy , Because the amount of data is too large , Create tablespaces and data files by day , The daily data is placed in different table spaces , In order to ensure the integrity of the data , Tables are associated by foreign keys , meanwhile , Tables are partitioned by referencing partitions . Now? , You need to clean up the historical data files of these tables .

Clean up the Database disk space of the table containing the referenced partition
Table cleanup referencing partitions
The reference partition is first a table A There are primary keys a1, Another table B The foreign key for is A.a1. If A Table is a partitioned table , that B Depending on the table A Partition the table .
When deleting , Just delete A One of the partitions of the table , that B The partition data corresponding to the table will also be cleaned up automatically .

Query the partition type view of the table
select * from all_part_tables;
View of all constraints of the query table ： It defines foreign keys and primary keys
select * from all_contraints;
Through the association of the above two tables , To query those tables that reference partitions and their corresponding primary tables .

Delete the table partition of a table
alter table table_name drop partition part_name update global indexes;

Delete a table space to clean up disk space
drop tablespace tablespace_name including contents and datafiles