select ranodom record from mysql and php

Use this query
“select * from table_name order by rand() limit 1 “

Get Database size in mysql and php

<?php
require_once(“conf.php”); // youe database connection file
$result = mysql_query( “SHOW TABLE STATUS” );
$dbsize = 0;
while( $row = mysql_fetch_array( $result ) ) {
$dbsize += $row[ "Data_length" ] + $row[ "Index_length" ];
}
?>
<?php
echo “<p>The size of the database is ” . formatfilesize( $dbsize ) . “</p>”;
?>