【紧急】疑似OceanBase内置诊断SQL导致CPU满载

OceanBase 技术问题
,
#1

【 使用版本 】OceanBase_CE_V4.2.1.7

我们正在使用 OMS 进行数据迁移 （从 MySQL 到 OceanBase），但是 OceanBase 中有一个完全没有参与到数据迁移的表，似乎被 OceanBase 自动执行了一些内置的诊断SQL，让 CPU 从 40+% 直接飙升到满载，产生了少则几十秒，多则几千秒的慢查询，也导致 OCP 一直频繁触发 CPU 使用率超限 的告警。

这些语句明显不是我们人为执行的。

类似的SQL语句比较多，并且每个SQL都只执行了一次，出于篇幅考虑，下面只列举两条（类似第二条的SQL非常多，只是分区名称或表名不同）：

SELECT /*+ NO_REWRITE USE_PLAN_CACHE(NONE) DBMS_STATS FULL(table) OPT_PARAM('ROWSETS_MAX_ROWS', 256) QUERY_TIMEOUT(14390919891)*/ COUNT(1), CALC_PARTITION_ID(`table`, SUBPART)
	, MAX(`id`), MIN(`id`)
	, COUNT(`id`), APPROX_COUNT_DISTINCT(`id`)
	, AVG(SYS_OP_OPNSIZE(`id`))
	, APPROX_COUNT_DISTINCT_SYNOPSIS(`id`), MAX(`merchant_id`)
	, MIN(`merchant_id`), COUNT(`merchant_id`)
	, APPROX_COUNT_DISTINCT(`merchant_id`)
	, AVG(SYS_OP_OPNSIZE(`merchant_id`))
	, APPROX_COUNT_DISTINCT_SYNOPSIS(`merchant_id`), MAX(`user_id`)
	, MIN(`user_id`), COUNT(`user_id`)
	, APPROX_COUNT_DISTINCT(`user_id`)
	, AVG(SYS_OP_OPNSIZE(`user_id`))
	, APPROX_COUNT_DISTINCT_SYNOPSIS(`user_id`), MAX(`col1`)
	, MIN(`col1`), COUNT(`col1`)
	, APPROX_COUNT_DISTINCT(`col1`)
	, AVG(SYS_OP_OPNSIZE(`col1`))
	, APPROX_COUNT_DISTINCT_SYNOPSIS(`col1`), MAX(`col2`)
	, MIN(`col2`), COUNT(`col2`)
	, APPROX_COUNT_DISTINCT(`col2`)
	, AVG(SYS_OP_OPNSIZE(`col2`))
	, APPROX_COUNT_DISTINCT_SYNOPSIS(`col2`), MAX(`col0`)
	, MIN(`col0`), COUNT(`col0`)
	, APPROX_COUNT_DISTINCT(`col0`)
	, AVG(SYS_OP_OPNSIZE(`col0`))
	, APPROX_COUNT_DISTINCT_SYNOPSIS(`col0`), MAX(`col3`)
	, MIN(`col3`), COUNT(`col3`)
	, APPROX_COUNT_DISTINCT(`col3`)
	, AVG(SYS_OP_OPNSIZE(`col3`))
	, APPROX_COUNT_DISTINCT_SYNOPSIS(`col3`), MAX(`col4`)
	, MIN(`col4`), COUNT(`col4`)
	, APPROX_COUNT_DISTINCT(`col4`)
	, AVG(SYS_OP_OPNSIZE(`col4`))
	, APPROX_COUNT_DISTINCT_SYNOPSIS(`col4`), MAX(`col5`)
	, MIN(`col5`), COUNT(`col5`)
	, APPROX_COUNT_DISTINCT(`col5`)
	, AVG(SYS_OP_OPNSIZE(`col5`))
	, APPROX_COUNT_DISTINCT_SYNOPSIS(`col5`), MAX(`col6`)
	, MIN(`col6`), COUNT(`col6`)
	, APPROX_COUNT_DISTINCT(`col6`)
	, AVG(SYS_OP_OPNSIZE(`col6`))
	, APPROX_COUNT_DISTINCT_SYNOPSIS(`col6`), MAX(`wcol5`)
	, MIN(`wcol5`), COUNT(`wcol5`)
	, APPROX_COUNT_DISTINCT(`wcol5`)
	, AVG(SYS_OP_OPNSIZE(`wcol5`))
	, APPROX_COUNT_DISTINCT_SYNOPSIS(`wcol5`), MAX(`status`)
	, MIN(`status`), COUNT(`status`)
	, APPROX_COUNT_DISTINCT(`status`)
	, AVG(SYS_OP_OPNSIZE(`status`))
	, APPROX_COUNT_DISTINCT_SYNOPSIS(`status`), MAX(`col7`)
	, MIN(`col7`), COUNT(`col7`)
	, APPROX_COUNT_DISTINCT(`col7`)
	, AVG(SYS_OP_OPNSIZE(`col7`))
	, APPROX_COUNT_DISTINCT_SYNOPSIS(`col7`), MAX(`col8`)
	, MIN(`col8`), COUNT(`col8`)
	, APPROX_COUNT_DISTINCT(`col8`)
	, AVG(SYS_OP_OPNSIZE(`col8`))
	, APPROX_COUNT_DISTINCT_SYNOPSIS(`col8`), MAX(`col9`)
	, MIN(`col9`), COUNT(`col9`)
	, APPROX_COUNT_DISTINCT(`col9`)
	, AVG(SYS_OP_OPNSIZE(`col9`))
	, APPROX_COUNT_DISTINCT_SYNOPSIS(`col9`), MAX(`col10`)
	, MIN(`col10`), COUNT(`col10`)
	, APPROX_COUNT_DISTINCT(`col10`)
	, AVG(SYS_OP_OPNSIZE(`col10`))
	, APPROX_COUNT_DISTINCT_SYNOPSIS(`col10`), MAX(`col11`)
	, MIN(`col11`), COUNT(`col11`)
	, APPROX_COUNT_DISTINCT(`col11`)
	, AVG(SYS_OP_OPNSIZE(`col11`))
	, APPROX_COUNT_DISTINCT_SYNOPSIS(`col11`), MAX(`col12`)
	, MIN(`col12`), COUNT(`col12`)
	, APPROX_COUNT_DISTINCT(`col12`)
	, AVG(SYS_OP_OPNSIZE(`col12`))
	, APPROX_COUNT_DISTINCT_SYNOPSIS(`col12`), MAX(`col13`)
	, MIN(`col13`), COUNT(`col13`)
	, APPROX_COUNT_DISTINCT(`col13`)
	, AVG(SYS_OP_OPNSIZE(`col13`))
	, APPROX_COUNT_DISTINCT_SYNOPSIS(`col13`), MAX(`col14`)
	, MIN(`col14`), COUNT(`col14`)
	, APPROX_COUNT_DISTINCT(`col14`)
	, AVG(SYS_OP_OPNSIZE(`col14`))
	, APPROX_COUNT_DISTINCT_SYNOPSIS(`col14`), MAX(`col15`)
	, MIN(`col15`), COUNT(`col15`)
	, APPROX_COUNT_DISTINCT(`col15`)
	, AVG(SYS_OP_OPNSIZE(`col15`))
	, APPROX_COUNT_DISTINCT_SYNOPSIS(`col15`), ?
FROM `bj_game`.`table` PARTITION (`P20240707_0sp0`, 
`P20240707_0sp1`, 
`P20240707_0sp2`, 
`P20240707_0sp3`, 
`P20240707_0sp4`, 
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`P20240721_0sp15`, 
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`P20240721_0sp19`, 
`P20240721_0sp20`, 
`P20240721_0sp21`, 
`P20240721_0sp22`, 
`P20240721_0sp23`, 
`P20240721_0sp24`, 
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`P20240701_0sp17`, 
`P20240701_0sp18`, 
`P20240701_0sp19`, 
`P20240701_0sp20`, 
`P20240701_0sp21`, 
`P20240701_0sp22`, 
`P20240701_0sp23`, 
`P20240701_0sp24`, 
`P20240701_0sp25`, 
`P20240701_0sp26`, 
`P20240701_0sp27`, 
`P20240701_0sp28`, 
`P20240701_0sp29`, 
`P20240701_0sp30`, 
`P20240701_0sp31`, 
`P20240702_0sp0`, 
`P20240702_0sp1`, 
`P20240702_0sp2`, 
`P20240702_0sp3`, 
`P20240702_0sp4`, 
`P20240702_0sp5`, 
`P20240702_0sp6`, 
`P20240702_0sp7`, 
`P20240702_0sp8`, 
`P20240702_0sp9`, 
`P20240702_0sp10`, 
`P20240702_0sp11`, 
`P20240702_0sp12`, 
`P20240702_0sp13`, 
`P20240702_0sp14`, 
`P20240702_0sp15`, 
`P20240702_0sp16`, 
`P20240702_0sp17`, 
`P20240702_0sp18`, 
`P20240702_0sp19`, 
`P20240702_0sp20`, 
`P20240702_0sp21`, 
`P20240702_0sp22`, 
`P20240702_0sp23`, 
`P20240702_0sp24`, 
`P20240702_0sp25`, 
`P20240702_0sp26`, 
`P20240702_0sp27`, 
`P20240702_0sp28`, 
`P20240702_0sp29`, 
`P20240702_0sp30`, 
`P20240702_0sp31`, 
`P20240703_0sp0`, 
`P20240703_0sp1`, 
`P20240703_0sp2`, 
`P20240703_0sp3`, 
`P20240703_0sp4`, 
`P20240703_0sp5`, 
`P20240703_0sp6`, 
`P20240703_0sp7`, 
`P20240703_0sp8`, 
`P20240703_0sp9`, 
`P20240703_0sp10`, 
`P20240703_0sp11`, 
`P20240703_0sp12`, 
`P20240703_0sp13`, 
`P20240703_0sp14`, 
`P20240703_0sp15`, 
`P20240703_0sp16`, 
`P20240703_0sp17`, 
`P20240703_0sp18`, 
`P20240703_0sp19`, 
`P20240703_0sp20`, 
`P20240703_0sp21`, 
`P20240703_0sp22`, 
`P20240703_0sp23`, 
`P20240703_0sp24`, 
`P20240703_0sp25`, 
`P20240703_0sp26`, 
`P20240703_0sp27`, 
`P20240703_0sp28`, 
`P20240703_0sp29`, 
`P20240703_0sp30`, 
`P20240703_0sp31`, 
`P20240704_0sp0`, 
`P20240704_0sp1`, 
`P20240704_0sp2`, 
`P20240704_0sp3`, 
`P20240704_0sp4`, 
`P20240704_0sp5`, 
`P20240704_0sp6`, 
`P20240704_0sp7`, 
`P20240704_0sp8`, 
`P20240704_0sp9`, 
`P20240704_0sp10`, 
`P20240704_0sp11`, 
`P20240704_0sp12`, 
`P20240704_0sp13`, 
`P20240704_0sp14`, 
`P20240704_0sp15`, 
`P20240704_0sp16`, 
`P20240704_0sp17`, 
`P20240704_0sp18`, 
`P20240704_0sp19`, 
`P20240704_0sp20`, 
`P20240704_0sp21`, 
`P20240704_0sp22`, 
`P20240704_0sp23`, 
`P20240704_0sp24`, 
`P20240704_0sp25`, 
`P20240704_0sp26`, 
`P20240704_0sp27`, 
`P20240704_0sp28`, 
`P20240704_0sp29`, 
`P20240704_0sp30`, 
`P20240704_0sp31`, 
`P20240705_0sp0`, 
`P20240705_0sp1`, 
`P20240705_0sp2`, 
`P20240705_0sp3`, 
`P20240705_0sp4`, 
`P20240705_0sp5`, 
`P20240705_0sp6`, 
`P20240705_0sp7`, 
`P20240705_0sp8`, 
`P20240705_0sp9`, 
`P20240705_0sp10`, 
`P20240705_0sp11`, 
`P20240705_0sp12`, 
`P20240705_0sp13`, 
`P20240705_0sp14`, 
`P20240705_0sp15`, 
`P20240705_0sp16`, 
`P20240705_0sp17`, 
`P20240705_0sp18`, 
`P20240705_0sp19`, 
`P20240705_0sp20`, 
`P20240705_0sp21`, 
`P20240705_0sp22`, 
`P20240705_0sp23`, 
`P20240705_0sp24`, 
`P20240705_0sp25`, 
`P20240705_0sp26`, 
`P20240705_0sp27`, 
`P20240705_0sp28`, 
`P20240705_0sp29`, 
`P20240705_0sp30`, 
`P20240705_0sp31`, 
`P20240706_0sp0`, 
`P20240706_0sp1`, 
`P20240706_0sp2`, 
`P20240706_0sp3`, 
`P20240706_0sp4`, 
`P20240706_0sp5`, 
`P20240706_0sp6`, 
`P20240706_0sp7`, 
`P20240706_0sp8`, 
`P20240706_0sp9`, 
`P20240706_0sp10`, 
`P20240706_0sp11`, 
`P20240706_0sp12`, 
`P20240706_0sp13`, 
`P20240706_0sp14`, 
`P20240706_0sp15`, 
`P20240706_0sp16`, 
`P20240706_0sp17`, 
`P20240706_0sp18`, 
`P20240706_0sp19`, 
`P20240706_0sp20`, 
`P20240706_0sp21`, 
`P20240706_0sp22`, 
`P20240706_0sp23`, 
`P20240706_0sp24`, 
`P20240706_0sp25`, 
`P20240706_0sp26`, 
`P20240706_0sp27`, 
`P20240706_0sp28`, 
`P20240706_0sp29`, 
`P20240706_0sp30`, 
`P20240706_0sp31`)
GROUP BY CALC_PARTITION_ID(`table`, SUBPART)

SELECT
/*+ NO_REWRITE USE_PLAN_CACHE(NONE) DBMS_STATS FULL(table) OPT_PARAM('ROWSETS_MAX_ROWS', 256) QUERY_TIMEOUT(14390928230)*/
TOP_K_FRE_HIST(?, `uid`, ?, ?)
FROM
`db`.`table` PARTITION (`P20240719_0`)

这种慢查询明显不正常，请问这种问题该如何解决呢 ？

2 个赞
#3

你贴的这两条SQL看着是统计信息收集的。用obdiag 巡检一下看看有没有啥问题。

  1. 安装obdiag; OceanBase分布式数据库-海量数据 笔笔算数
  2. 配置被诊断集群：obdiag config -hxx.xx.xx.xx -uroot@sys -p***** -Pxxx ,文档：OceanBase分布式数据库-海量数据 笔笔算数
  3. 执行巡检命令:obdiag check

先把巡检结果发出来看看

2 个赞
#4

好的，谢谢。我们先试试。

image
image1324×91 4.63 KB

不过这个 统计信息收集 的SQL占用的资源也太多了吧 ？最关键的一个SQL慢查询的时间超过了1个小时，CPU占用超过60% 。
不知道这个收集统计信息是怎么触发的，有什么 开关 或 触发时间 设置吗 ？
主要是担心，如果是生产环境，时不时的也这么搞一下，那就完蛋了。感觉就像一个定时炸弹一样。

2 个赞
#5

obdiag check 输出
obdiag_check_report_observer_2024-07-23-10-26-13.txt (21.0 KB)

2 个赞
#6

obdiag 巡检报告我看了下，除了一个内存模块超10GB的需要确认一下，其他的内容都还ok.

image
image1920×472 133 KB

你执行一下obdiag gather scene run --scene=observer.base ,生成的一份SQL文件你发回来我看一下。

PS: 统计信息的问题我们有专人提工单跟进一下

2 个赞
#7

obdiag gather scene run --scene=observer.base 输出, 请帮忙看下
sql_result.txt (1.4 MB)

1 个赞
#8

已联系统计信息相关研发同学分析中

1 个赞
#9

这些是统计信息收集相关的SQL，排查下最近一天是否有调度异常

– sys租户，查询非空则说明有租户调度异常（推荐）
SELECT tenant_id AS failed_scheduler_tenant_id
FROM oceanbase.__all_tenant t
WHERE NOT EXISTS(SELECT 1
FROM oceanbase.__all_virtual_task_opt_stat_gather_history h
WHERE TYPE = 1
AND start_time > date_sub(now(), interval 1 day)
AND h.tenant_id = t.tenant_id);

2 个赞
#10

查询结果为空

screenshot-20240723-181555
screenshot-20240723-181555709×259 33.7 KB

1 个赞
#11

说明统计信息的任务调度都是正常的，你这里cpu高可能是在业务运行期间同时运行了统计信息收集任务，导致cpu资源紧张。

继续排查下，
1.是否有统计信息收集失败的表：
–sys租户执行，可选指定相应租户id
SELECT t_opt.tenant_id,
t_opt.task_id,
task_opt.start_time AS task_start_time,
task_opt.end_time AS task_end_time,
d.database_name,
t.table_name,
t_opt.table_id,
t_opt.ret_code,
t_opt.start_time,
t_opt.end_time,
t_opt.memory_used,
t_opt.stat_refresh_failed_list,
t_opt.properties
FROM (
SELECT tenant_id,
task_id,
start_time,
end_time,
table_count
FROM oceanbase.__all_virtual_task_opt_stat_gather_history
WHERE type = 1
– AND tenant_id = {tenant_id}
AND start_time > date_sub(Now(), interval 1 day)) task_opt
JOIN oceanbase.__all_virtual_table_opt_stat_gather_history t_opt
JOIN oceanbase.__all_virtual_table t
JOIN oceanbase.__all_virtual_database d
WHERE t_opt.ret_code != 0
AND task_opt.task_id = t_opt.task_id
AND task_opt.tenant_id = t_opt.tenant_id
AND t_opt.tenant_id = t.tenant_id
AND t_opt.table_id = t.table_id
AND t.tenant_id = d.tenant_id
AND t.database_id = d.database_id
AND t_opt.table_id > 200000;

2.检查对应的调度的时间有无错乱等
–sys租户执行，可选指定相应租户id
SELECT tenant_id,
job_name,
what,
start_date,
this_date,
last_date,
next_date,
enabled
FROM oceanbase.__all_virtual_tenant_scheduler_job
WHERE tenant_id = {tenant_id}
AND job_name IN ( ‘MONDAY_WINDOW’, ‘TUESDAY_WINDOW’, ‘WEDNESDAY_WINDOW’,
‘THURSDAY_WINDOW’,
‘FRIDAY_WINDOW’, ‘SATURDAY_WINDOW’, ‘SUNDAY_WINDOW’ )
AND job != 0;

如果有大表自动统计信息收集时间过长或者失败则需要制定大表统计信息收集策略，

统计信息收集窗口也可根据业务情况调整到低峰期进行，参考

– MySQL业务租, 比如现在是2024-03-07, 周四早上11点, 需要调整为从周五凌晨2点开始:
call dbms_scheduler.set_attribute(‘MONDAY_WINDOW’, ‘NEXT_DATE’, ‘2024-03-11 02:00:00’);
call dbms_scheduler.set_attribute(‘TUESDAY_WINDOW’, ‘NEXT_DATE’, ‘2024-03-12 02:00:00’);
call dbms_scheduler.set_attribute(‘WEDNESDAY_WINDOW’, ‘NEXT_DATE’, ‘2024-03-13 02:00:00’);
call dbms_scheduler.set_attribute(‘THURSDAY_WINDOW’, ‘NEXT_DATE’, ‘2024-03-14 02:00:00’);
call dbms_scheduler.set_attribute(‘FRIDAY_WINDOW’, ‘NEXT_DATE’, ‘2024-03-08 02:00:00’);
call dbms_scheduler.set_attribute(‘SATURDAY_WINDOW’, ‘NEXT_DATE’, ‘2024-03-09 02:00:00’);
call dbms_scheduler.set_attribute(‘SUNDAY_WINDOW’, ‘NEXT_DATE’, ‘2024-03-10 02:00:00’);

–统计信息任务禁用，启用参考
– MySQL业务租户:
– 禁止
call dbms_scheduler.disable(‘MONDAY_WINDOW’);
call dbms_scheduler.disable(‘TUESDAY_WINDOW’);
call dbms_scheduler.disable(‘WEDNESDAY_WINDOW’);
call dbms_scheduler.disable(‘THURSDAY_WINDOW’);
call dbms_scheduler.disable(‘FRIDAY_WINDOW’);
call dbms_scheduler.disable(‘SATURDAY_WINDOW’);
call dbms_scheduler.disable(‘SUNDAY_WINDOW’);

– 启用
call dbms_scheduler.enable(‘MONDAY_WINDOW’);
call dbms_scheduler.enable(‘TUESDAY_WINDOW’);
call dbms_scheduler.enable(‘WEDNESDAY_WINDOW’);
call dbms_scheduler.enable(‘THURSDAY_WINDOW’);
call dbms_scheduler.enable(‘FRIDAY_WINDOW’);
call dbms_scheduler.enable(‘SATURDAY_WINDOW’);
call dbms_scheduler.enable(‘SUNDAY_WINDOW’);

#12

如果再次出现cpu负载高的情况，可以使用obdiag场景化信息收集
obdiag gather scene run --scene=observer.cpu_high

https://www.oceanbase.com/docs/common-obdiag-cn-1000000000902157

#13

存在一张统计信息收集失败的表.
result.txt (1.3 KB)

#14

好的, 非常感谢你的帮助, 我们调整下统计信息任务时间再观察下

#15

这个问题有再次出现吗？

#16

这种负载特别高的情况没有再次出现。
第一次估计是因为刚刚用 OMS 迁移了大量的数据到 OB，后面的数据变动就没有那么频繁了。
目前我们也调整了 维护窗口的任务执行时间。

不过，我的建议是，有没有办法将 收集统计信息 的 CPU 开销限制在一定范围内，比如不超过 30% 或 40%。
这样的话，能够让 OB 的负载更均衡，不容易出现负载大幅抖动的情况。