我的项目中有页面加载时间问题。 我的表中有近30000条记录并在该表上执行搜索功能，Code工作正常，但页面加载时间非常长（超过一分钟）。在获取结果后，我在ajax中进行了分页，Ajax请求也花费了太多时间（超过分钟）以下是我的代码请给出任何建议来克服这个问题。
public function get_data($info,$limit,$offset=0){
if(!is_array($info) && count($info)<1) return false;
try{
$orderbyString = "";
$likestr = "";$or='';$plus='';
if(isset($info['skill'])){
foreach($info['skill'] as $key => $val){
if($key!=0){$or=' OR ';$plus=' + ';}
$orderbyString .=" ".$plus." (( CHAR_LENGTH(r.resume) - CHAR_LENGTH( REPLACE ( r.resume, '".strtolower($val)."', '') ) ) / CHAR_LENGTH('".strtolower($val)."')) ";
}
$wholeString="ROUND ( ".$orderbyString." ) AS res_count ";
}
$this->db->select('r.resume_id, r.jobseeker_id, r.qualification, r.firstname, r.lastname, r.skills as skill_title, r.jobtitle, r.resume_date as last_updated_date, r.jobtype, r.location as city, r.country as state, r.workstatus, r.salary, r.experience, '.$wholeString.' ');
$this->db->from('jp_resumes as r');
$this->db->where('r.resume_status','1');
if(isset($info['time_period']) && $info['time_period']!=='' && count($info['time_period'])>0 ){
$date = date_create_from_format('m-d-Y', $info['time_period'][0]);
$start_d=date_format($date, 'Y-m-d');
$dates = date_create_from_format('m-d-Y', $info['time_period'][1]);
$end_d=date_format($dates, 'Y-m-d');
$arr_two=array('r.resume_date >= '=>$start_d,'r.resume_date <= '=>$end_d);
$this->db->group_start();
$this->db->where($arr_two);
$this->db->group_end();
}
if(isset($info['skill'])){
//print_r($info['skill']);exit;
$this->db->group_start();
foreach($info['skill'] as $key => $val){
$arr_two=array('r.skills'=>$val,'r.jobtitle'=>$val,'r.resume'=>$val);
$this->db->or_like($arr_two);
}
$this->db->group_end();
}
if(isset($info['work']) && is_array($info['work']) && count($info['work'])>0 ){
$this->db->group_start();
foreach($info['work'] as $key => $val){
$arr_two=array('r.workstatus'=>$val);
$this->db->or_like($arr_two);
}
$this->db->group_end();
}
if(isset($info['jobtype']) && $info['jobtype']!=='' && count($info['jobtype'])>0 && $info['jobtype'][0] !== ''){
$this->db->group_start();
foreach($info['jobtype'] as $key => $val){
$arr_two=array('r.jobtype'=>$val,'r.emp_type'=>$val);
$this->db->or_like($arr_two);
}
$this->db->group_end();
}
if(isset($info['state']) && count($info['state'])>0 && $info['state']!=''){
$this->db->group_start();
foreach($info['state'] as $key=>$val){
$arr_one=array('r.country'=>$val);
$this->db->or_like($arr_one);
}
$this->db->group_end();
}
$this->db->order_by('res_count','desc');
$this->db->limit($limit,$offset);
$query = $this->db->get();
if($query === false){
log_message('debug',__FUNCTION__." -> ".mysql_error());
}else{
if($query->num_rows() > 0)
return $query->result();
}
}catch(Exception $e){
log_message('error',$e->getMessage());
}
}
答案 0 :(得分：0)
我在mysql和codeigniter中遇到了性能问题，我终于发现DNS名称查找超时是问题所在。
我使用的是centos，而我的/etc/resolv.conf（DNS服务器配置）是一些无法访问的IP。 MySQL服务器尝试使用这些IP查找名称并发生超时。
我将skip-name-resolve添加到/etc/my.cnf并重新启动了mysql服务并修复了性能问题。
答案 1 :(得分：0)
问题是使用like运算符，它需要花费太多时间来执行。我将我的代码从like运算符更新为Match（column_name）反对（值），它的工作正常，现在页面加载时间小于5秒
这是更新的代码
public function get_resumes_comma($info,$limit,$offset=0){
if(!is_array($info) && count($info)<1) return false;
try{
$orderbyString = "";
$likestr = "";$or='';$plus='';
$this->db->select('r.resume_id, r.jobseeker_id, r.qualification, r.firstname, r.lastname, r.skills as skill_title, r.jobtitle, r.resume_date as last_updated_date, r.jobtype, r.location as city, r.country as state, r.workstatus, r.salary, r.experience');
$this->db->from('jp_resumes as r');
$this->db->where('r.resume_status','1');
if(isset($info['time_period']) && $info['time_period']!=='' && count($info['time_period'])>0 ){
$date = date_create_from_format('m-d-Y', $info['time_period'][0]);
$start_d=date_format($date, 'Y-m-d');
$dates = date_create_from_format('m-d-Y', $info['time_period'][1]);
$end_d=date_format($dates, 'Y-m-d');
$arr_two=array('r.resume_date >= '=>$start_d,'r.resume_date <= '=>$end_d);
$this->db->group_start();
$this->db->where($arr_two);
$this->db->group_end();
}
if(isset($info['skill'])){
$this->db->group_start();
foreach($info['skill'] as $key => $val){
$this->db->or_where('MATCH (resume) AGAINST ("'.$val.'")', NULL, FALSE );
$this->db->or_where('MATCH (skills) AGAINST ("'.$val.'")', NULL, FALSE );
$this->db->or_where('MATCH (jobtitle) AGAINST ("'.$val.'")', NULL, FALSE );
//$this->db->or_like($arr_two);
}
$this->db->group_end();
}
if(isset($info['work']) && is_array($info['work']) && count($info['work'])>0 ){
$this->db->group_start();
foreach($info['work'] as $key => $val){
$arr_two=array('r.workstatus'=>$val);
$this->db->or_like($arr_two);
}
$this->db->group_end();
}
if(isset($info['jobtype']) && $info['jobtype']!=='' && count($info['jobtype'])>0 && $info['jobtype'][0] !== ''){
$this->db->group_start();
foreach($info['jobtype'] as $key => $val){
$arr_two=array('r.jobtype'=>$val,'r.emp_type'=>$val);
$this->db->or_like($arr_two);
}
$this->db->group_end();
}
if(isset($info['state']) && count($info['state'])>0 && $info['state']!=''){
$this->db->group_start();
foreach($info['state'] as $key=>$val){
$arr_one=array('r.country'=>$val);
$this->db->or_like($arr_one);
}
$this->db->group_end();
}
$this->db->limit($limit,$offset);
$query = $this->db->get();
if($query === false){
log_message('debug',__FUNCTION__." -> ".mysql_error());
}else{
if($query->num_rows() > 0)
return $query->result();
}
}catch(Exception $e){
log_message('error',$e->getMessage());
}
}