Discard Table Notice For Free

Sequences created with create sequence are not associated with any particular table and so they are never automatically dropped.

DELETE command is a Data Manipulation Language command whereas, DROP is a Data Definition Language Command. The point that distinguishes DELETE and DROP command is that DELETE is used to remove tuples from a table and DROP is used to remove entire schema, table, domain or constraints from the database.

To remove specific rows, use DELETE . To remove all rows from a large table and leave the table structure, use TRUNCATE TABLE . It's faster than DELETE . To remove an entire table, including its structure and data, use DROP TABLE .

The tablespace must be dropped explicitly using DROP TABLESPACE tablespacename . Similar to the system tablespace, truncating or dropping tables stored in a general tablespace creates free space internally in the general tablespace . ibd data file which can only be used for new InnoDB data.

To perform the PURGE DBARECYCLEBIN operation, you must have the SYSDBA or PURGE DBARECYCLEBIN system privilege. Specify the name of the table or index in the recycle bin that you want to purge.

DROP TABLE always removes any indexes, rules, triggers, and constraints that exist for the target table. However, to drop a table that is referenced by a view or a foreign-key constraint of another table, CASCADE must be specified.

Dropping a table removes the table definition from the data dictionary. All rows of the table are no longer accessible. All indexes and triggers associated with a table are dropped. All views and PL/SQL program units dependent on a dropped table remain, yet become invalid (not usable).

The simplest way to reclaim space from the undo tablespace is to create a new undo tablespace, make it the database undo tablespace and drop the old tablespace. In the following example I've used autoextend, but you may wish to remove this if you want manual control over the datafile size.

Yes, in Oracle, the SQL VIEW continues to exist even after one of the tables (that the SQL VIEW is based on) is dropped from the database. However, if you try to query the SQL VIEW after the table has been dropped, you will receive a message indicating that the SQL VIEW has errors.

Use the DROP TABLESPACE statement to remove a tablespace from the database. When you drop a tablespace, Oracle Database does not place it in the recycle bin. Therefore, you cannot subsequently either purge or undrop the tablespace. You must have the DROP TABLESPACE system privilege.