慢查詢——如何提高mysql中的查詢性能

Question

我有一個包含 449383 條記錄的表。 當我執行以下查詢時，需要花費大量時間才能獲得 32643 條記錄。

這是查詢：

SELECT  alloc_id,  cr_number,  profile_id,  table_id,  provider_id,
        user_id,  team_id,  trans_reason_id,  trans_reason,  data_id,
        trans_fr_provider_id,  trans_to_provider_id,  from_office_team_id,
        to_office_team_id,  trans_fr_resp_officer_id,
        trans_to_resp_officer_id,   fr_team,  to_team,  fr_officer,
        to_officer,  start_date,  end_date,  alloc_date,  request_type,
        tr_id,  desc_id,  desc,  bd_status_id,  active,   display_order,
        created_date,  created_by,  created_by_user_id,  modified_date,
        modified_by,  modified_by_user_id,  deleted,  deleted_date,
        deleted_by,   deleted_by_user_id,  locked,  version
FROM    cm_alloc_spg
WHERE   team_id IS NOT NULL 
    AND end_date IS NULL AND locked = 0 
LIMIT   1000000;

執行計划：

 id  select_type  table         type  possible_keys            key     key_len  ref      rows  Extra   
---  -----------  ------------  ----  -------------            ------  -------  -----  ------  ----------------------------------
  1  SIMPLE       cm_alloc_spg  ref   team_idx,ed_idx,loc_idx  ed_idx       4   const  228838  Using index condition; Using where

創建查詢結構：

CREATE TABLE `cm_alloc_spg` (
  `alloc_id` INT(10) NOT NULL AUTO_INCREMENT,
  `cr_number` VARCHAR(50) DEFAULT NULL,
  `profile_id` INT(11) NOT NULL,
  `table_id` INT(11) NOT NULL,
  `provider_id` INT(10) DEFAULT NULL,
  `user_id` INT(11) DEFAULT NULL,
  `team_id` INT(11) DEFAULT NULL,
  `trans_reason_id` INT(11) DEFAULT NULL,
  `trans_reason` VARCHAR(400) DEFAULT NULL,
  `data_id` INT(11) NOT NULL,
  `trans_fr_provider_id` INT(11) DEFAULT NULL,
  `trans_to_provider_id` INT(11) DEFAULT NULL,
  `from_office_team_id` INT(10) DEFAULT NULL,
  `to_office_team_id` INT(10) DEFAULT NULL,
  `trans_fr_resp_officer_id` INT(10) DEFAULT NULL,
  `trans_to_resp_officer_id` INT(10) DEFAULT NULL,
  `fr_team` VARCHAR(100) DEFAULT NULL,
  `to_team` VARCHAR(100) DEFAULT NULL,
  `fr_officer` VARCHAR(100) DEFAULT NULL,
  `to_officer` VARCHAR(100) DEFAULT NULL,
  `start_date` DATE NOT NULL,
  `end_date` DATE DEFAULT NULL,
  `alloc_date` DATE DEFAULT NULL,
  `request_type` VARCHAR(40) DEFAULT NULL,
  `tr_id` INT(11) DEFAULT NULL,
  `desc_id` INT(10) DEFAULT NULL,
  `desc` VARCHAR(700) DEFAULT NULL,
  `bd_status_id` INT(11) DEFAULT NULL,
  `active` TINYINT(4) DEFAULT 0,
  `display_order` INT(4) NOT NULL,
  `created_date` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP(),
  `created_by` VARCHAR(100) NOT NULL,
  `created_by_user_id` INT(11) NOT NULL,
  `modified_date` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP(),
  `modified_by` VARCHAR(100) NOT NULL,
  `modified_by_user_id` INT(11) NOT NULL,
  `deleted` TINYINT(4) NOT NULL DEFAULT 0,
  `deleted_date` TIMESTAMP NULL DEFAULT NULL,
  `deleted_by` VARCHAR(100) DEFAULT NULL,
  `deleted_by_user_id` INT(11) DEFAULT NULL,
  `locked` TINYINT(4) NOT NULL DEFAULT 0,
  `version` INT(11) NOT NULL DEFAULT 0,
  PRIMARY KEY (`alloc_id`),
  KEY `fk_profile_id_idx` (`profile_id`),
  KEY `fk_user_id_idx` (`user_id`),
  KEY `team_idx` (`team_id`),
  KEY `cr_number_idx` (`cr_number`),
  KEY `tab_idx` (`table_id`),
  KEY `ed_idx` (`end_date`),
  KEY `loc_idx` (`locked`),
  KEY `alloc_date_idx` (`alloc_date`),
  KEY `tr_id_idx` (`tr_id`),
  KEY `del_idx` (`deleted`),
  KEY `to_off_team_id_idx` (`to_office_team_id`),
  KEY `trns_res_offcr_id_idx` (`trans_to_resp_officer_id`),
  KEY `active_idx` (`active`)
) ENGINE=INNODB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8

如何提高查詢效率？

Answer 1

我認為您應該使用分頁，如果您有大量記錄，我建議不要獲取所有數據。

SELECT alloc_id，cr_number，PROFILE_ID，table_id的，PROVIDER_ID，USER_ID，TEAM_ID，trans_reason_id，trans_reason，data_id，trans_fr_provider_id，trans_to_provider_id，from_office_team_id，to_office_team_id，trans_fr_resp_officer_id，trans_to_resp_officer_id，fr_team，to_team，fr_officer，to_officer，日期，結束日期，alloc_date，request_type，tr_id , desc_id, desc, bd_status_id, active, display_order, created_date, created_by, created_by_user_id, modified_date, modified_by, modified_by_user_id,deleted,deleted_date,deleted_by,deleted_by_user_id,locked,version from cm_alloc_spg WHERE team_iddate is NOT NULL AND_LOCK 0,100;

限制子句語法索引，沒有要檢索的行

Answer 2

Gupta，你可以做一件事，在這個表中創建 team_id、end_data 和鎖定索引。 您可以通過示例輕松制作任何屬性索引

在 cm_alloc_spg(team_id) 上創建索引 team_id_1;

它將使您的查詢速度提高 30 倍以上。 評論任何幫助。