What are the Optimal Methods for Multi-row Inserts in Oracle?

Optimizing Multi-Row Inserts in Oracle Databases

Efficiently inserting multiple database records simultaneously is vital for database performance. Oracle offers several methods for achieving this.

Utilizing INSERT ALL (Oracle 9 and Earlier)

For older Oracle versions (9 and below), the INSERT ALL statement provides a viable solution:

<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>

Streamlined Multi-Row Inserts in Oracle 23c

Oracle 23c simplifies multi-row inserts with a more concise syntax:

<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 method is particularly beneficial for high-volume data insertion, offering significant performance improvements.

Best Practices for Large-Scale Inserts

For substantial data sets, consider these best practices:

• Batching: Insert data in batches of no more than 1000 rows per operation. This reduces parsing overhead and enhances efficiency.
• Staging Tables: Employ a temporary table to stage data before inserting it into the target table. This approach improves overall insert performance.

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