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What is bulk delete in Oracle?
the rule to decide when to use a bulk delete: “use it when you cannot do the delete in a single SQL statement”. Here, you probably had a table with more some number of indexes and deleting just does alot of work. Maintaining the index structures for 300,000 deletes can be “cumbersome”.
How do I delete multiple entries in Oracle?
3 Answers. You could use IN : DELETE FROM MYTABLE WHERE (ID, NAME) IN (SELECT 1 AS ID, ‘xyz’ AS NAME FROM dual UNION ALL SELECT 2 AS ID, ‘abc’ AS NAME FROM dual UNION ALL SELECT 3 AS ID, ‘abc’ AS NAME FROM dual);
How do I delete multiple rows?
How can I delete multiple rows in Excel?
- Open the Excel sheet and select all the rows that you want to delete.
- Right-click the selection and click Delete or Delete rows from the list of options.
- Alternatively, click the Home tab, navigate to the Cells group, and click Delete.
- A drop-down menu will open on your screen.
How to delete data from a large table in Oracle?
Vanilla delete: On a super-large table, a delete statement will required a dedicated rollback segment (UNDO log), and in some cases, the delete is so large that it must be written in PL/SQL with a COMMIT every million rows. Note that Oracle parallel DML allows you to parallelize large SQL deletes.
How many records can I delete in Oracle 10g?
I’m using Oracle 10g and want to delete approx 5 million records from Persons table (Having total 15 million records) which doesn’t have any reference in Order table (Having total 5 million records) Since deteting 5 million records in one go would cause undo log issues, I’ve decided to delete in batches of 100k.
How to delete rows from a large table?
If you must do the delete in a 24×7 environment you have limited methods for deleting the rows: Vanilla delete: On a super-large table, a delete statement will required a dedicated rollback segment (UNDO log), and in some cases, the delete is so large that it must be written in PL/SQL with a COMMIT every million rows.
Which is the fastest way to delete data from a large table?
In cases where you are deleting more than 30-50% of the rows in a very large table it is faster to use CTAS to delete from a table than to do a vanilla delete and a reorganization of the table blocks and a rebuild of the constraints and indexes.