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SQLSTATE[HY000] [1044] Access denied
Posted by: YOONTAE KIM
Date: June 16, 2016 07:55PM

Using web service when my colleague sends a lot of requests to my server, the following error occurs at about 10% frequency.

SQLSTATE[HY000] [1044] Access denied for user ''@'localhost' to database ‘mydb_1.0.0131’

The following is the my colleague’s request. The function add_data() is called 50,000 times.

while(1) {
if (end) break;


But if sleep() is added as like following, this error does not occur.

while(1) {
if (end) break;

sleep(2); // 2ms

My server systems are Red Hat Enterprise Server 6.5 + MySQL(5.5.49) + Apache(2.2.31) + PHP(5.6.21).
If the request comes, trying to connect database to add data using PDO as like followings.
And the upper error occurs.

class database extends PDO {
protected $dbconn;

public function __contstruct($iniFile) {
$dbName = “mydb_1.0.0131”;

getAccountPassword($iniFile, $dbUser, $dbPass);

$dsn = “mysql:host=;dbname={$dbName};charset=utf8”;

try {
$this->dbconn = parent::__construct($dsn, $dbUser, $dbPass);
} catch (PDOException $e) {

I thought that “max_connections” should be increased.
But if this is the reason, the error code will be 1040 not 1044.

Can anyone advise me what the problem is?
Thanks for any suggestions.

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SQLSTATE[HY000] [1044] Access denied
June 16, 2016 07:55PM

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