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Full Discussion: MySQL Performance Problems
The Lounge What is on Your Mind? MySQL Performance Problems Post 303041045 by Neo on Tuesday 12th of November 2019 11:10:22 PM
Old 11-13-2019
Added some quick code to turn on and off various "bot blocking code" based on the load average of the site.

Very simple example:

Code:
<?php
$quickload = getLoad();
if ($quickload > 6) {
    $checkbot = "SELECT bot_flag, country_iso2 FROM session WHERE country_iso2 IN ('RU','CN','KR','KP','UA','TW') AND userid = 0 AND host ='" . $ipFilter . "' LIMIT 1";

    $session_info = $vbulletin->db->query_first($checkbot);
    if ($session_info['bot_flag'] == '1' && $session_info && NEO_SEND_SOME_BOTS_TO_403) {
        $file = '/var/log/apache2/debug/neo_global_country_bot_block_403.log';
        if ($neo_global['debug_block_with_403']) {
            error_log(date(DATE_RFC822) . ' SEND 403 Page: ' . $_SERVER['REMOTE_ADDR'] . ' Country: ' . $session_info['country_iso2'] ." Load: ".$quickload. "\n", 3, $file);
        }
        header($_SERVER["SERVER_PROTOCOL"] . " 403 Forbidden", true, 403);
        include '/var/www/status/403.html';
        die;
    }
}

function getLoad()
{
  $string=file_get_contents('/proc/loadavg');
  $loadavg=explode(' ', $string);
  if($loadavg[0]){
        return $loadavg[0];
  }else{
        return 0;
  }       
}

 

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Apache::Session::Store::MySQL(3pm)			User Contributed Perl Documentation			Apache::Session::Store::MySQL(3pm)

NAME
Apache::Session::Store::MySQL - Store persistent data in a MySQL database SYNOPSIS
use Apache::Session::Store::MySQL; my $store = new Apache::Session::Store::MySQL; $store->insert($ref); $store->update($ref); $store->materialize($ref); $store->remove($ref); DESCRIPTION
Apache::Session::Store::MySQL fulfills the storage interface of Apache::Session. Session data is stored in a MySQL database. SCHEMA
To use this module, you will need at least these columns in a table called 'sessions', or another table name if you provide the TableName argument: id char(32) # or however long your session IDs are. a_session text To create this schema, you can execute this command using the mysql program: CREATE TABLE sessions ( id char(32) not null primary key, a_session text ); If you use some other command, ensure that there is a unique index on the table's id column. CONFIGURATION
The module must know what datasource, username, and password to use when connecting to the database. These values can be set using the options hash (see Apache::Session documentation). The options are: DataSource UserName Password TableName Handle Example: tie %hash, 'Apache::Session::MySQL', $id, { DataSource => 'dbi:mysql:database', UserName => 'database_user', Password => 'K00l', TableName => 'sessions' }; Instead, you may pass in an already-opened DBI handle to your database. tie %hash, 'Apache::Session::MySQL', $id, { Handle => $dbh }; AUTHOR
This modules was written by Jeffrey William Baker <jwbaker@acm.org> SEE ALSO
Apache::Session perl v5.10.1 2010-10-18 Apache::Session::Store::MySQL(3pm)
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