增量查询需要很长时间才能在 MariaDB 中执行

Question

下面的查询在生产服务器数据库上执行需要 0.005 秒到 7 秒，但在本地数据库上最多需要 0.010 秒。不知道查询有什么问题。

查询：

UPDATE tbl_entrance_exam_report_info SET 
total_marks_obtained=total_marks_obtained+0.0, 
marks_obtained_from_overall_subjects=marks_obtained_from_overall_subjects+0.0, 
end_time=NOW(), 
total_solved=total_solved+1, 
overall_skipped_question_ids='', 
skipped_question_ids='', 
total_incorrect_answers=total_incorrect_answers+1 
WHERE id=4737

注意： 具有 +x 增量的列是 int 或 float。另外，生产服务器数据库已经转储并导入到localhost，有4k数据。

SHOW CREATE TABLE tbl_entrance_exam_report_info:

CREATE TABLE `tbl_entrance_exam_report_info` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `created_date` datetime NOT NULL,
  `end_time` datetime DEFAULT NULL,
  `start_time` datetime NOT NULL,
  `total_correct_answers` int(11) NOT NULL DEFAULT 0,
  `total_incorrect_answers` int(11) NOT NULL DEFAULT 0,
  `total_marks_obtained` float NOT NULL,
  `total_skipped` int(11) NOT NULL DEFAULT 0,
  `total_solved` int(11) NOT NULL DEFAULT 0,
  `admission_student_information_id` bigint(20) DEFAULT NULL,
  `online_exam_set_id` bigint(20) NOT NULL,
  `team_id` int(11) DEFAULT NULL,
  `exited` tinyint(1) DEFAULT 0,
  `overall_skipped_question_ids` longtext DEFAULT NULL,
  `skipped_question_ids` longtext DEFAULT NULL,
  `student_id` int(11) DEFAULT NULL,
  `marks_obtained_from_overall_subjects` float NOT NULL DEFAULT 0,
  `admission_application_id` bigint(20) DEFAULT NULL,
  `college_admission_application_id` bigint(20) DEFAULT NULL,
  `public_student_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `FK1B3AE9E19768BB6B` (`online_exam_set_id`),
  KEY `FK1B3AE9E1F94118FD` (`admission_student_information_id`),
  KEY `FK1B3AE9E17E2DE65F` (`team_id`),
  KEY `FK1B3AE9E18CFA03F5` (`student_id`),
  KEY `FKoq6i5nhgrsdcin3vxrwl6qout` (`admission_application_id`),
  KEY `FKfskks7r4xmjma8eckjdfmg9st` (`college_admission_application_id`),
  KEY `FKsmin66q8dcsuvm7rexdujrolm` (`public_student_id`),
  CONSTRAINT `FK1B3AE9E17E2DE65F` FOREIGN KEY (`team_id`) REFERENCES `tbl_team` (`id`),
  CONSTRAINT `FK1B3AE9E18CFA03F5` FOREIGN KEY (`student_id`) REFERENCES `tbl_student` (`id`),
  CONSTRAINT `FK1B3AE9E19768BB6B` FOREIGN KEY (`online_exam_set_id`) REFERENCES `tbl_online_exam_set_school` (`id`),
  CONSTRAINT `FK1B3AE9E1F94118FD` FOREIGN KEY (`admission_student_information_id`) REFERENCES `tbl_admission_student_application` (`id`),
  CONSTRAINT `FKfskks7r4xmjma8eckjdfmg9st` FOREIGN KEY (`college_admission_application_id`) REFERENCES `tbl_college_admission_application` (`id`),
  CONSTRAINT `FKoq6i5nhgrsdcin3vxrwl6qout` FOREIGN KEY (`admission_application_id`) REFERENCES `tbl_admission_application` (`id`),
  CONSTRAINT `FKsmin66q8dcsuvm7rexdujrolm` FOREIGN KEY (`public_student_id`) REFERENCES `tbl_public_student` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4744 DEFAULT CHARSET=utf8

SHOW GLOBAL STATUS

生产服务器 MariaDB 详细信息（较慢的一个）:

本地服务器 MariaDB 详细信息:

更新： my.cnf 调整更改：

[mysqld]
max_allowed_packet = 1000M
max_connections = 9999
innodb_buffer_pool_instances    = 6     # Use 1 instance per 1GB of InnoDB pool size
innodb_buffer_pool_size         = 6G    # Use up to 70-80% of RAM
innodb_log_file_size = 256M

#cache
query_cache_type = 1
query_cache_limit = 256k
query_cache_min_res_unit = 2k
query_cache_size = 80M

服务器信息：

Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                20
On-line CPU(s) list:   0-19
Thread(s) per core:    1
Core(s) per socket:    1
Socket(s):             20
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 79
Model name:            Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
Stepping:              1
CPU MHz:               2097.063
BogoMIPS:              4195.17
Hypervisor vendor:     Xen
Virtualization type:   full
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              20480K
NUMA node0 CPU(s):     0-19
RAM:                   40GB

Answer 1

禁用查询缓存；

query_cache_type=0
query_cache_size=0

在用于测试运行的配置文件中使用 set global query_cache_type=0,query_cache_size=0。

要查看这种情况是否仍在发生，请启用您的查询日志：

slow_query_log=1
slow_query_log_file=/var/log/mysql/mariadb-slow.log
log_slow_verbosity=explain
long_query_time=1

（这些也可以在运行时设置）。

尝试解决您在 dba stack exchange 上的缓慢查询。

查找用于监控存储的 io 容量和延迟的机制。

增量查询需要很长时间才能在 MariaDB 中执行

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