<?php

# To use run with a url query string of clean=var (files) or clean=log (db tables) to clean.
$xml = simplexml_load_file('./app/etc/local.xml', NULL, LIBXML_NOCDATA);

$db['host'] = $xml->global->resources->default_setup->connection->host;
$db['name'] = $xml->global->resources->default_setup->connection->dbname;
$db['user'] = $xml->global->resources->default_setup->connection->username;
$db['pass'] = $xml->global->resources->default_setup->connection->password;
$db['pref'] = $xml->global->resources->db->table_prefix;

if($_GET['clean'] == 'log') clean_log_tables();
if($_GET['clean'] == 'var') clean_var_directory();

if(empty($_GET)) echo "To use run with a url query string of clean=var (files) or clean=log (db tables) to clean.";

function clean_log_tables() {
    global $db;

    $tables = array(
        'dataflow_batch_export',
        'dataflow_batch_import',
        'log_customer',
        'log_quote',
        'log_summary',
        'log_summary_type',
        'log_url',
        'log_url_info',
        'log_visitor',
        'log_visitor_info',
        'log_visitor_online',
        'report_event'
    );

    mysql_connect($db['host'], $db['user'], $db['pass']) or die(mysql_error());
    mysql_select_db($db['name']) or die(mysql_error());

    foreach($tables as $v => $k) {
        mysql_query('TRUNCATE `'.$db['pref'].$k.'`') or die(mysql_error());
    }
    
    echo "All log tables have been cleaned."; 
}

function clean_var_directory() {
    $dirs = array(
        'downloader/pearlib/cache/*',
        'downloader/pearlib/download/*',
        'var/cache/',
        'var/log/',
        'var/report/',
        'var/session/',
        'var/tmp/'
    );

    foreach($dirs as $v => $k) {
        exec('rm -rf '.$k);
    }
    
    echo "All log files have been cleaned."; 
}
?>

<?php
$xml = simplexml_load_file('./app/etc/local.xml', NULL, LIBXML_NOCDATA);

$db['host'] = $xml->global->resources->default_setup->connection->host;
$db['name'] = $xml->global->resources->default_setup->connection->dbname;
$db['user'] = $xml->global->resources->default_setup->connection->username;
$db['pass'] = $xml->global->resources->default_setup->connection->password;
$db['pref'] = $xml->global->resources->db->table_prefix;

if($_GET['clean'] == 'log') clean_log_tables();
if($_GET['clean'] == 'var') clean_var_directory();

function clean_log_tables() {
    global $db;
    
    $tables = array(
        'dataflow_batch_export',
        'dataflow_batch_import',
        'log_customer',
        'log_quote',
        'log_summary',
        'log_summary_type',
        'log_url',
        'log_url_info',
        'log_visitor',
        'log_visitor_info',
        'log_visitor_online',
        'report_event'
    );
    
    mysql_connect($db['host'], $db['user'], $db['pass']) or die(mysql_error());
    mysql_select_db($db['name']) or die(mysql_error());
    
    foreach($tables as $v => $k) {
        mysql_query('TRUNCATE `'.$db['pref'].$k.'`') or die(mysql_error());
    }
}

function clean_var_directory() {
    $dirs = array(
        'downloader/pearlib/cache/*',
        'downloader/pearlib/download/*',
        'var/cache/',
        'var/log/',
        'var/report/',
        'var/session/',
        'var/tmp/'
    );
    
    foreach($dirs as $v => $k) {
        exec('rm -rf '.$k);
    }
}
?>

http://www.crucialwebhost.com/kb/article/log-cache-maintenance-script/

Save the file to the directory where Magento resides.

Log & Cache Maintenance Script

magento

PHP