How Does `rewriteBatchedStatements=true` Optimize MySQL JDBC Network Performance?

Optimizing MySQL JDBC Network Performance with rewriteBatchedStatements=true

The JDBC (Java Database Connectivity) driver offers substantial performance gains via the rewriteBatchedStatements=true parameter. This setting enables the driver to consolidate multiple database queries into a single network transmission, dramatically reducing network overhead.

MySQL's max_allowed_packet setting dictates the maximum size of incoming packets. Should a batched query packet exceed this limit, errors can occur. However, the JDBC driver intelligently handles this: it dynamically determines max_allowed_packet and adjusts its batching strategy to avoid exceeding the limit.

To confirm this behavior, activate the MySQL general log and monitor the JDBC connection. You'll observe Connector/J retrieving max_allowed_packet and adapting its batching accordingly.

Below is a code example illustrating rewriteBatchedStatements=true in action:

<code class="language-java">String connectionString = "jdbc:mysql://localhost:3307/mydb?" +
        "useUnicode=true&characterEncoding=UTF-8" +
        "&rewriteBatchedStatements=true";

try (Connection con = DriverManager.getConnection(connectionString, "root", "whatever")) {
    try (PreparedStatement ps = con.prepareStatement("INSERT INTO jdbc (`name`) VALUES (?)")) {
        for (int i = 1; i <= 1000; i++) {
            ps.setString(1, "Name" + i);
            ps.addBatch();
        }
        ps.executeBatch();
    }
}</code>

Without rewriteBatchedStatements=true, this code would send individual INSERT statements. With it enabled, JDBC efficiently bundles these into a single multi-row INSERT, significantly minimizing network traffic.

Therefore, JDBC ensures efficient batch query handling in MySQL, offering performance enhancements and seamless compatibility without requiring manual developer intervention. The driver intelligently manages batch sizes based on the server's max_allowed_packet setting.

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