Issue with PHP's PDO MySQL Prepared Statements and Large Data Insertion Performance
I just started working with I'm facing a significant performance drop when using PDO's prepared statements for bulk inserts into a MySQL database. The project uses PHP 8.1 with MySQL 8.0, and I thought using prepared statements would improve security and performance, but it seems to be the opposite in this scenario. When trying to insert a large array of data (around 10,000 records), the operation takes several minutes to complete. Here's the code I've been using: ```php $data = [...]; // assume this contains 10,000 associative arrays of data $pdo = new PDO('mysql:host=localhost;dbname=test', 'user', 'pass'); $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $sql = "INSERT INTO my_table (column1, column2, column3) VALUES (:column1, :column2, :column3)"; $stmt = $pdo->prepare($sql); foreach ($data as $row) { $stmt->execute([ ':column1' => $row['column1'], ':column2' => $row['column2'], ':column3' => $row['column3'], ]); } ``` I'm aware that executing the `execute()` method in a loop can be inefficient for large datasets, but I thought prepared statements would still be faster than concatenating SQL strings. I also tried wrapping the execution in a transaction: ```php $pdo->beginTransaction(); foreach ($data as $row) { $stmt->execute([ ':column1' => $row['column1'], ':column2' => $row['column2'], ':column3' => $row['column3'], ]); } $pdo->commit(); ``` This approach didn't show any significant improvement in speed. I also checked the MySQL configuration and ensured that the `innodb_flush_log_at_trx_commit` setting is set to `2`, which could help with insert performance. Is there a more efficient way to handle bulk inserts using PDO? Would using a single SQL query with multiple value sets be a better approach, or am I missing something? Is there a simpler solution I'm overlooking?