Delete parent without entries in child table

Hi
I have two table with millions of records. The child table has referential integrity with the parent and the foreign-key is indexed.
I must delete all the parent rows with no corresponding entries in child table.
What is the faster way?

You might test using DML error logging so you don't have to 'find' the rows. Just delete them all and let Oracle put the error rows in the log table.
Try this using the sample DDL you provided above:
exec DBMS_ERRLOG.CREATE_ERROR_LOG ('CHILD')
ALTER TABLE ERR$_CHILD DROP COLUMN C_ID;
ALTER TABLE ERR$_CHILD DROP COLUMN C_P_ID;
delete from parent
LOG ERRORS INTO err$_child ('DELETE') REJECT LIMIT UNLIMITED;
The drawback is the space taken for the required columns in the log table for child row data that had a parent. The two ALTER statements above DROP the actual 'child' columns from the log table after it is created to save space but the required fields will still be populated.
The DELETE will be successful and will remove 'parent' rows with NO children.

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SQL>Edited by: P. Forstmann on 15 févr. 2011 13:45

Delete parent without entries in child table

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