Mysql Error = Can't create UNIX socket (24) - mysql

Question

I have got the following exception
Mysql Caught Exception = Can't create UNIX socket (24).
I know that UNIX system error 24. That's "too many open files."
I refered this question ,:OperationalError: (2001, "Can't create UNIX socket (24)")
But I need to understand the exact problem.
In my code I execute multiple select query and store the result,not using free_result method in between.
Can it be the case of this error : Can't create UNIX socket (24)
Here is my code :
pthread_mutex_lock(&mysqlMutex);
mysql = mysql_init(NULL);
my_bool reconnect = 1;
MYSQL* connection;
mysql_options(mysql, MYSQL_OPT_RECONNECT, &reconnect);
connection = mysql_real_connect( server,user,password, database_name, 0, NULL, 0 );
if(connection == NULL)
{
//Connection failed.Exception Handling
}
//Execute query :SELECT * from user ;
mysql_query(mysql, getuser_query);
MYSQL_RES *mysql_res = mysql_store_result(mysql);
// Query # 2
// SELECT * from usergroup.
mysql_query(m_pMysql, userGroup_query);
mysql_res = mysql_store_result(mysql);
// Query # 3
// Query # 4
At the last:
//free mysql memory
mysql_free_result(mysql_res);
mysql_close(mysql);
pthread_mutex_unlock(&mysqlMutex);

Answer 1

You are perhaps opening too many simultaneous connections to mysql server. You need to increase available FDs to mysql process. You can usually do so with /etc/security/limits* in your linux distro.
You can also look at this question: Mysql decrease opened files