protected function configure()
{
parent::configure();
$this->setName('db:variables')->setDescription('Shows important variables or custom selected');
$help = <<<HELP
This command is useful to print all important variables about the current database.
HELP;
$this->setHelp($help);
}
/**
* @param array $outputVars
* @param bool $hasDescription
*
* @return array
*/
protected function generateRows(array $outputVars, $hasDescription)
{
$rows = parent::generateRows($outputVars, $hasDescription);
if (false === $hasDescription) {
return $rows;
}
if (isset($this->_allVariables['Handler_read_rnd_next'])) {
$tableScanRate = ($this->_allVariables['Handler_read_rnd_next'] + $this->_allVariables['Handler_read_rnd']) / ($this->_allVariables['Handler_read_rnd_next'] + $this->_allVariables['Handler_read_rnd'] + $this->_allVariables['Handler_read_first'] + $this->_allVariables['Handler_read_next'] + $this->_allVariables['Handler_read_key'] + $this->_allVariables['Handler_read_prev']);
$rows[] = array('Full table scans', sprintf('%.2f', $tableScanRate * 100) . '%', $this->formatDesc('HINT: "Handler_read_rnd_next" is reset to zero when reached the value of 2^32 (4G).'));
}
if (isset($this->_allVariables['Innodb_buffer_pool_read_requests'])) {
$bufferHitRate = $this->_allVariables['Innodb_buffer_pool_read_requests'] / ($this->_allVariables['Innodb_buffer_pool_read_requests'] + $this->_allVariables['Innodb_buffer_pool_reads']);
$rows[] = array('InnoDB Buffer Pool hit', sprintf('%.2f', $bufferHitRate * 100) . '%', $this->formatDesc('An InnoDB Buffer Pool hit ratio below 99.9% is a weak indicator that
your InnoDB Buffer Pool could be increased.'));
}
return $rows;
}
