How Can I Efficiently Perform Multi-Row Inserts in Oracle Databases?

Optimizing Oracle Multi-Row Inserts

This guide details efficient methods for inserting multiple rows into Oracle databases, focusing on approaches superior to those used in MySQL.

The INSERT ALL Statement

Oracle's INSERT ALL syntax provides a robust solution for multi-row inserts:

<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>

Here:

• t designates the target table.
• col1, col2, col3 represent the table's columns.
• val1_1 through val3_3 are the values to be inserted.
• DUAL is a built-in virtual table used for single-row queries.

Simplified Syntax (Oracle 23c and later)

Oracle 23c introduced a more streamlined 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 approach offers improved conciseness and performance compared to INSERT ALL.

Performance Best Practices

While the newer syntax is generally superior for bulk inserts, consider limiting the number of rows per insert statement to minimize parsing overhead and maximize efficiency, even with Oracle 23c's improved syntax. For extremely large datasets, investigate using other techniques like SQL*Loader.

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