How Can I Optimize Multi-Row Inserts in Oracle?

Boosting Oracle Multi-Row Inserts: Best Practices

Efficiently inserting multiple rows into Oracle databases requires utilizing the most effective syntax available. This guide details the optimal methods:

For Oracle versions preceding 23c, the INSERT ALL statement provides a structured and reliable approach:

<code class="language-sql">INSERT ALL
   INTO t (col1, col2, col3) VALUES ('val1_1', 'val1_2', 'val1_3')
   INTO t (col1, col2, col3) VALUES ('val2_1', 'val2_2', 'val2_3')
   INTO t (col1, col2, col3) VALUES ('val3_1', 'val3_2', 'val3_3')
   .
   .
   .
SELECT 1 FROM DUAL;</code>

This method ensures all rows are inserted atomically within a single transaction, guaranteeing data integrity and improved performance.

Oracle 23c and later versions offer a streamlined syntax for multi-row inserts:

<code class="language-sql">INSERT INTO t(col1, col2, col3) VALUES
('val1_1', 'val1_2', 'val1_3'),
('val2_1', 'val2_2', 'val2_3'),
('val3_1', 'val3_2', 'val3_3');</code>

This newer syntax delivers substantial performance gains, particularly when dealing with large datasets containing thousands of rows. Its optimized internal processing significantly reduces parsing overhead.

For maximum efficiency with large inserts, consider batching the data. A batch size of approximately 1000 rows is generally recommended. Larger batches can lead to performance degradation due to increased parsing times. By implementing these optimized techniques, developers can dramatically improve the speed and efficiency of data insertion in Oracle.

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