How does pconnect in PHP affect the active database connection and the need to specify the database before each query?

When using pconnect in PHP, the active database connection is persistent across multiple requests, eliminating the need to specify the database before each query. This can improve performance by reducing the overhead of establishing a new connection for each query. However, it's important to handle connections carefully to avoid exhausting resources on the server. 

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = mysql_pconnect($servername, $username, $password);

if (!$conn) {
    die("Connection failed: " . mysql_error());
}

mysql_select_db($dbname, $conn);

// Perform queries without specifying the database each time

mysql_close($conn);
?>

Keywords

pconnect PHP active database connection specify database query

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