frequent automatic restart of mysql server and later permanent shutdown [closed] - php

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The MySQL server is restarting frequently. 75 times in less than 24 hours. And finally its ending without restarting!
Please check the details log here: mysqld.log
140113 10:18:22 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
140113 10:18:31 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
140113 10:18:31 InnoDB: Initializing buffer pool, size = 8.0M
140113 10:18:31 InnoDB: Completed initialization of buffer pool
140113 10:18:31 InnoDB: Started; log sequence number 16 1064411530
140113 10:18:32 [Note] Event Scheduler: Loaded 0 events
140113 10:18:32 [Note] /usr/libexec/mysqld: ready for connections.
Version: '5.1.61' socket: '/var/lib/mysql/mysql.sock' port: 3306 Source distribution
140113 18:45:09 mysqld_safe Number of processes running now: 0
140113 18:45:10 mysqld_safe mysqld restarted
140113 18:45:10 InnoDB: Initializing buffer pool, size = 8.0M
140113 18:45:10 InnoDB: Completed initialization of buffer pool
140113 18:45:10 InnoDB: Started; log sequence number 16 1064411530
140113 18:45:11 [Note] Event Scheduler: Loaded 0 events
140113 18:45:11 [Note] /usr/libexec/mysqld: ready for connections.
Version: '5.1.61' socket: '/var/lib/mysql/mysql.sock' port: 3306 Source distribution
......
140114 9:50:12 InnoDB: Initializing buffer pool, size = 8.0M
140114 9:50:12 InnoDB: Completed initialization of buffer pool
140114 9:50:12 InnoDB: Started; log sequence number 16 1064411530
140114 9:50:13 [Note] Event Scheduler: Loaded 0 events
140114 9:50:13 [Note] /usr/libexec/mysqld: ready for connections.
Version: '5.1.61' socket: '/var/lib/mysql/mysql.sock' port: 3306 Source distribution
140114 09:55:07 mysqld_safe Number of processes running now: 0
140114 09:55:07 mysqld_safe mysqld restarted
140114 9:55:08 InnoDB: Initializing buffer pool, size = 8.0M
140114 9:55:08 InnoDB: Completed initialization of buffer pool
140114 09:55:08 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
In the meantime its killing 62 processes due to out of memory. Please check the detail log: messages
Jan 14 09:41:53 centos63 kernel: Out of memory: Kill process 16795 (mysqld) score 20 or sacrifice child
Jan 14 09:41:53 centos63 kernel: Killed process 16795, UID 27, (mysqld) total-vm:574508kB, anon-rss:20488kB, file-rss:164kB
I am running a cronjob in each 5 minutes which is affecting some tables with about 200000, 50000, 25000 data in three tables.
SELECT over 1,257 members then over 9,844 member_boards and then INSERT/UPDATE over 168,624 member_cards using the below pseudocode:
<?php
$qry = _("SELECT _members");
while($member = mysql_fetch_assoc($res))
{//1,257
$qry = _("SELECT _member_boards");
while($db_board = mysql_fetch_assoc($board_res))
{//9,844
$s_lists = curl_download("https://api.com/boards/lists");
foreach ($lists as $list) {//9,844
if(!strcmp('SOMETHING', $list->name)){//Matching with API and DB
$curl = "https://api.com/lists/cards";
foreach ($cards as $card) {//168,624
$qry = _("SELECT _member_cards");
if($card_row = mysql_fetch_assoc($card_res)){
$qry = _("UPDATE _member_cards");
}
else{
echo $qry = _("INSERT _member_cards");
}
}
}
}
}
$qry = _("UPDATE _member_cards");
}
?>
So what can be the reason and how can I solve this issue?
RAM 512 MB until now.
CentOS
Can scaling RAM up to 1 GB solve the issue?

Answer 1

Your MySQL server is getting killed because it uses too much memory; you can either add more RAM to the server or try lowering MySQL's memory usage by changing some values in its configuration file; however that may affect performance.
Take a look at this question and this one for guides about tweaking MySQL's configuration - it's not an easy task and it's based on trial and error, you should try different values until you get a good balance between performance and memory usage.