Is it advisable to update all records at once or in batches when updating a MySQL database with PHP?

When updating a MySQL database with PHP, it is generally advisable to update records in batches rather than all at once, especially if you are dealing with a large number of records. Updating all records at once can lead to performance issues and potential timeouts, especially if the database is under heavy load. By updating records in batches, you can efficiently manage the process and reduce the risk of overwhelming the database server. 

// Connect to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Update records in batches
$batchSize = 1000;
$totalRecords = 5000;

for ($i = 0; $i < $totalRecords; $i += $batchSize) {
    $sql = "UPDATE table SET column = 'value' WHERE condition LIMIT $i, $batchSize";
    $conn->query($sql);
}

// Close the connection
$conn->close();

Keywords

PHP MySQL database update batching

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