Oracle Batch Update: Millions of Data Fast

1 year ago
Olivia Parker
1 minute

In Oracle databases, batch update statements can be used to update a large amount of data. Here is one commonly used method:

  1. Create a temporary table and insert the data that needs to be updated into it.
  2. Match and update the data in the target table with the data in the temporary table using the MERGE statement.

The specific steps are as follows:

  1. Create a temporary table, such as temp_table, to store the data that needs to be updated.
CREATE TABLE temp_table (
    id NUMBER,
    column1 VARCHAR2(50),
    column2 VARCHAR2(50),
    ...
);
  1. Insert the data that needs to be updated into a temporary table.
INSERT INTO temp_table (id, column1, column2, ...)
VALUES (1, 'value1', 'value2'),
       (2, 'value3', 'value4'),
       ...
  1. Use the MERGE statement to match and update data in the temporary table with the target table.
MERGE INTO target_table t
USING temp_table tt
ON (t.id = tt.id)
WHEN MATCHED THEN
UPDATE SET t.column1 = tt.column1, t.column2 = tt.column2, ...

By following the above steps, it is possible to perform batch updates on millions of data. It is important to be cautious when updating a large amount of data to avoid placing too much strain on the database.

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