public function getPageBufferpool()
{
// The following query is only possible because we know
// that we are on MySQL 5 here (checked above)!
// side note: I love MySQL 5 for this. :-)
$sql = '
SHOW STATUS
WHERE Variable_name LIKE \'Innodb\\_buffer\\_pool\\_%\'
OR Variable_name = \'Innodb_page_size\';';
$status = $GLOBALS['dbi']->fetchResult($sql, 0, 1);
$output = '<table class="data" id="table_innodb_bufferpool_usage">' . "\n" . ' <caption class="tblHeaders">' . "\n" . ' ' . __('Buffer Pool Usage') . "\n" . ' </caption>' . "\n" . ' <tfoot>' . "\n" . ' <tr>' . "\n" . ' <th colspan="2">' . "\n" . ' ' . __('Total') . "\n" . ' : ' . Util::formatNumber($status['Innodb_buffer_pool_pages_total'], 0) . ' ' . __('pages') . ' / ' . join(' ', Util::formatByteDown($status['Innodb_buffer_pool_pages_total'] * $status['Innodb_page_size'])) . "\n" . ' </th>' . "\n" . ' </tr>' . "\n" . ' </tfoot>' . "\n" . ' <tbody>' . "\n" . ' <tr>' . "\n" . ' <th>' . __('Free pages') . '</th>' . "\n" . ' <td class="value">' . Util::formatNumber($status['Innodb_buffer_pool_pages_free'], 0) . '</td>' . "\n" . ' </tr>' . "\n" . ' <tr>' . "\n" . ' <th>' . __('Dirty pages') . '</th>' . "\n" . ' <td class="value">' . Util::formatNumber($status['Innodb_buffer_pool_pages_dirty'], 0) . '</td>' . "\n" . ' </tr>' . "\n" . ' <tr>' . "\n" . ' <th>' . __('Pages containing data') . '</th>' . "\n" . ' <td class="value">' . Util::formatNumber($status['Innodb_buffer_pool_pages_data'], 0) . "\n" . '</td>' . "\n" . ' </tr>' . "\n" . ' <tr>' . "\n" . ' <th>' . __('Pages to be flushed') . '</th>' . "\n" . ' <td class="value">' . Util::formatNumber($status['Innodb_buffer_pool_pages_flushed'], 0) . "\n" . '</td>' . "\n" . ' </tr>' . "\n" . ' <tr>' . "\n" . ' <th>' . __('Busy pages') . '</th>' . "\n" . ' <td class="value">' . Util::formatNumber($status['Innodb_buffer_pool_pages_misc'], 0) . "\n" . '</td>' . "\n" . ' </tr>';
// not present at least since MySQL 5.1.40
if (isset($status['Innodb_buffer_pool_pages_latched'])) {
$output .= ' <tr>' . ' <th>' . __('Latched pages') . '</th>' . ' <td class="value">' . Util::formatNumber($status['Innodb_buffer_pool_pages_latched'], 0) . '</td>' . ' </tr>';
}
$output .= ' </tbody>' . "\n" . '</table>' . "\n\n" . '<table class="data" id="table_innodb_bufferpool_activity">' . "\n" . ' <caption class="tblHeaders">' . "\n" . ' ' . __('Buffer Pool Activity') . "\n" . ' </caption>' . "\n" . ' <tbody>' . "\n" . ' <tr>' . "\n" . ' <th>' . __('Read requests') . '</th>' . "\n" . ' <td class="value">' . Util::formatNumber($status['Innodb_buffer_pool_read_requests'], 0) . "\n" . '</td>' . "\n" . ' </tr>' . "\n" . ' <tr>' . "\n" . ' <th>' . __('Write requests') . '</th>' . "\n" . ' <td class="value">' . Util::formatNumber($status['Innodb_buffer_pool_write_requests'], 0) . "\n" . '</td>' . "\n" . ' </tr>' . "\n" . ' <tr>' . "\n" . ' <th>' . __('Read misses') . '</th>' . "\n" . ' <td class="value">' . Util::formatNumber($status['Innodb_buffer_pool_reads'], 0) . "\n" . '</td>' . "\n" . ' </tr>' . "\n" . ' <tr>' . "\n" . ' <th>' . __('Write waits') . '</th>' . "\n" . ' <td class="value">' . Util::formatNumber($status['Innodb_buffer_pool_wait_free'], 0) . "\n" . '</td>' . "\n" . ' </tr>' . "\n" . ' <tr>' . "\n" . ' <th>' . __('Read misses in %') . '</th>' . "\n" . ' <td class="value">' . ($status['Innodb_buffer_pool_read_requests'] == 0 ? '---' : htmlspecialchars(Util::formatNumber($status['Innodb_buffer_pool_reads'] * 100 / $status['Innodb_buffer_pool_read_requests'], 3, 2)) . ' %') . "\n" . '</td>' . "\n" . ' </tr>' . "\n" . ' <tr>' . "\n" . ' <th>' . __('Write waits in %') . '</th>' . "\n" . ' <td class="value">' . ($status['Innodb_buffer_pool_write_requests'] == 0 ? '---' : htmlspecialchars(Util::formatNumber($status['Innodb_buffer_pool_wait_free'] * 100 / $status['Innodb_buffer_pool_write_requests'], 3, 2)) . ' %') . "\n" . '</td>' . "\n" . ' </tr>' . "\n" . ' </tbody>' . "\n" . '</table>' . "\n";
return $output;
}
