sql - MySQL: "The SELECT would examine more than MAX_JOIN_SIZE rows"

Question

I am using PHP and MySQL. In my program there is a select query involving joins. When I run it on localhost it's working fine but when I upload it on my server and try to execute it then it generates the following error:

The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET SQL_MAX_JOIN_SIZE=# if the SELECT is okay

How can I correct this?

Answer 1

When using PHP, SQL_BIG_SELECTS=1 should be set in a separate query before your main query. For example:

$mysqli = new mysqli("localhost", "root", "password", "db"); 

$mysqli->query("SET SQL_BIG_SELECTS=1");  //Set it before your main query

$results = $mysqli->query("SELECT a, b, c FROM test");
while($row = $results->fetch_assoc()){
    echo '<pre>';
    print_r ($row);
    echo '</pre>';
}