array('RATIO', '=GetKeyHitRatio', '=WarnCacheRatio'), 'InnoDB cache hit ratio' => array('RATIO', '=GetInnoDBHitRatio', '=WarnCacheRatio'), 'data cache hit ratio' => array('HIDE', # only if called '=FindDBHitRatio', '=WarnCacheRatio'), 'sql cache hit ratio' => array('RATIO', '=GetQHitRatio', ''), 'IO', 'data reads' => array('IO', '=GetReads', 'Number of selects (Key_reads is not accurate)'), 'data writes' => array('IO', '=GetWrites', 'Number of inserts/updates/deletes * coef (Key_writes is not accurate)'), 'Data Cache', 'MyISAM data cache size' => array('DATAC', array("show variables", 'key_buffer_size'), '' ), 'BDB data cache size' => array('DATAC', array("show variables", 'bdb_cache_size'), '' ), 'InnoDB data cache size' => array('DATAC', array("show variables", 'innodb_buffer_pool_size'), '' ), 'Memory Usage', 'read buffer size' => array('CACHE', array("show variables", 'read_buffer_size'), '(per session)'), 'sort buffer size' => array('CACHE', array("show variables", 'sort_buffer_size'), 'Size of sort buffer (per session)' ), 'table cache' => array('CACHE', array("show variables", 'table_cache'), 'Number of tables to keep open'), 'Connections', 'current connections' => array('SESS', array('show status','Threads_connected'), ''), 'max connections' => array( 'SESS', array("show variables",'max_connections'), ''), false ); function perf_mysql(&$conn) { $this->conn =& $conn; } function Explain($sql) { if (strtoupper(substr(trim($sql),0,6)) !== 'SELECT') return '

Unable to EXPLAIN non-select statement

'; $sql = str_replace('?',"''",$sql); $s = '

Explain: '.htmlspecialchars($sql).'

'; $rs = $this->conn->Execute('EXPLAIN '.$sql); $s .= rs2html($rs,false,false,false,false); $s .= $this->Tracer($sql); return $s; } function Tables() { if (!$this->tablesSQL) return false; $rs = $this->conn->Execute($this->tablesSQL); if (!$rs) return false; $html = rs2html($rs,false,false,false,false); return $html; } function GetReads() { global $ADODB_FETCH_MODE; $save = $ADODB_FETCH_MODE; $ADODB_FETCH_MODE = ADODB_FETCH_NUM; $rs = $this->conn->Execute('show status'); $ADODB_FETCH_MODE = $save; if (!$rs) return 0; $val = 0; while (!$rs->EOF) { switch($rs->fields[0]) { case 'Com_select': $val = $rs->fields[1]; $rs->Close(); return $val; } $rs->MoveNext(); } $rs->Close(); return $val; } function GetWrites() { global $ADODB_FETCH_MODE; $save = $ADODB_FETCH_MODE; $ADODB_FETCH_MODE = ADODB_FETCH_NUM; $rs = $this->conn->Execute('show status'); $ADODB_FETCH_MODE = $save; if (!$rs) return 0; $val = 0.0; while (!$rs->EOF) { switch($rs->fields[0]) { case 'Com_insert': $val += $rs->fields[1]; break; case 'Com_delete': $val += $rs->fields[1]; break; case 'Com_update': $val += $rs->fields[1]/2; $rs->Close(); return $val; } $rs->MoveNext(); } $rs->Close(); return $val; } function FindDBHitRatio() { // first find out type of table //$this->conn->debug=1; $rs = $this->conn->Execute('show table status'); if (!$rs) return ''; $type = strtoupper($rs->fields[1]); $rs->Close(); switch($type){ case 'MYISAM': case 'ISAM': return $this->DBParameter('MyISAM cache hit ratio').' (MyISAM)'; case 'INNODB': return $this->DBParameter('InnoDB cache hit ratio').' (InnoDB)'; default: return $type.' not supported'; } } function GetQHitRatio() { //Total number of queries = Qcache_inserts + Qcache_hits + Qcache_not_cached $hits = $this->_DBParameter(array("show status","Qcache_hits")); $total = $this->_DBParameter(array("show status","Qcache_inserts")); $total += $this->_DBParameter(array("show status","Qcache_not_cached")); $total += $hits; if ($total) return ($hits*100)/$total; return 0; } /* Use session variable to store Hit percentage, because MySQL does not remember last value of SHOW INNODB STATUS hit ratio # 1st query to SHOW INNODB STATUS 0.00 reads/s, 0.00 creates/s, 0.00 writes/s Buffer pool hit rate 1000 / 1000 # 2nd query to SHOW INNODB STATUS 0.00 reads/s, 0.00 creates/s, 0.00 writes/s No buffer pool activity since the last printout */ function GetInnoDBHitRatio() { global $HTTP_SESSION_VARS; $stat = $this->conn->GetOne('show innodb status'); $at = strpos($stat,'Buffer pool hit rate'); $stat = substr($stat,$at,200); if (preg_match('!Buffer pool hit rate\s*([0-9]*) / ([0-9]*)!',$stat,$arr)) { $val = 100*$arr[1]/$arr[2]; $HTTP_SESSION_VARS['INNODB_HIT_PCT'] = $val; return $val; } else { if (isset($HTTP_SESSION_VARS['INNODB_HIT_PCT'])) return $HTTP_SESSION_VARS['INNODB_HIT_PCT']; return 0; } return 0; } function GetKeyHitRatio() { $hits = $this->_DBParameter(array("show status","Key_read_requests")); $reqs = $this->_DBParameter(array("show status","Key_reads")); if ($reqs == 0) return 0; return ($hits/($reqs+$hits))*100; } } ?>