slow dashboard routine, performance improvement suggestions

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Moderator: Thorsten

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Posts: 25
Joined: Mon Dec 10, 2007 9:26 pm

slow dashboard routine, performance improvement suggestions

Post by Lidio » Fri Feb 06, 2015 7:50 am

Hi Thorsten,

In version 2.8.19 (with the index on time for session table) I still find that the loading to the dashboard slow when there are "plenty" of session records. This appears to be the result from the function getLast30DaysVisits()

Code: Select all

     * Calculates the number of visits per day the last 30 days
     * @returns array
    public function getLast30DaysVisits()
        $stats  = array();
        $visits = array();

        $startDate = strtotime('-1 month');
        $endDate   = $_SERVER['REQUEST_TIME'];

        $query = sprintf("
                sid, time
                time > %d
                time < %d;",
        $result = $this->_config->getDb()->query($query);

        while ($row = $this->_config->getDb()->fetchObject($result)) {
            $visits[] = $row->time;

        for ($date = $startDate; $date <= $endDate; $date += 86400) {
            $stats[date('Y-m-d', $date)] = 0;
            foreach ($visits as $visitDate) {
                if (date('Y-m-d', $date) === date('Y-m-d', $visitDate)) {
                    $stats[date('Y-m-d', $date)]++;

        return $stats;
Two suggestions:
(1) I did not see any usage of the "sid" from the SELECT statement thinking it could be removed thus only selecting time which is already indexed.

(2) replace the tallying loop with the following for the same results:

Code: Select all

        for ($date = $startDate; $date <= $endDate; $date += 86400) {
            $stats[date('Y-m-d', $date)] = 0;
        foreach ($visits as $visitDate) {
            $stats[date('Y-m-d', $visitDate)]++;
This eliminates unnecessary iterations and multiple calls to the "date" function.

Both changes have a significant performance improvement on my site.

As always, thanks for all the work.


Posts: 14559
Joined: Tue Sep 25, 2001 11:14 am
Location: #phpmyfaq

Re: slow dashboard routine, performance improvement suggesti

Post by Thorsten » Fri Feb 06, 2015 7:38 pm


thanks a lot, you're right. Fixed for 2.8.20: ... 0a46032e98

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