SQL性能降低的相关内容

阿里云文档 2025-06-19

如何查看性能事件

在数据库日常运维中，您可以通过查看数据库实例中计划执行、正在执行和已执行完成的性能事件（例如异常事件、优化事件、弹性伸缩事件等），及时且全面地了解数据库的性能问题及相关的运维操作。本文介绍如何在RDS中实时查看实例的各类性能事件。

阿里云文档 2025-05-28

RDS SQL Server高性能云盘IO性能突发功能

如果您的业务波动较大，业务波峰较频繁，可以开启高性能云盘的IO性能突发功能，使云盘的IOPS不受限于最大IOPS，在业务波峰时获得更高的IO能力，满足突发业务需求。

阿里云文档 2025-05-15

如何解决在DMS中执行SQL后提示“当前SQL不满足数据库性能安全需求”

问题描述当前执行的SQL不满足数据库性能安全需求，请优化SQL并通过执行计划观察、提高SQL性能或同步元数据后重试。问题原因当查询SQL对应的执行计划为全表扫描时，DMS会自动判断当前表数据量是否大于DMS安全规则的全表扫描数据量限制。若超过，则不允许执行SQL。解决方案可通过如下方式解决此问题：通...

阿里云文档 2025-04-28

RDS高性能云盘"IO性能突发"费用减免活动

高性能云盘“IO性能突发”功能上线后，因IOPS与存储空间解耦的独特产品特性，受到广大用户的关注，RDS决定面向全网客户展开IO性能突发功能免费活动。详见RDS MySQL IO性能突发、RDS PostgreSQL IO性能突发、RDS SQL Server IO性能突发。RDS MySQL IO...

阿里云文档 2025-02-13

8种专坑同事的 SQL 写法，性能降低100倍，不来看看？

1、LIMIT 语句2、隐式转换3、关联更新、删除4、混合排序5、EXISTS语句6、条件下推7、提前缩小范围8、中间结果集下推总结sql语句的执行顺序：FROM <left_table> ON <join_condition> <join_type> JOIN <right_table> WHERE <where_condition>....

文章 2017-07-18 来自：开发者社区

SQL性能突然降低引起的业务办理缓慢案例一则

钟时荣云和恩墨技术专家大家好，我是云和恩墨的技术支持工程师钟时荣，服务的行业主要分布在通信、能源、政府、医疗和金融。作为一位冲在一线的现场 DBA 而言，回望过去，往往有种“往事不堪回首“的感觉，还没有闭上眼曾经处理各种问题的景象就已经浮现在眼前。作为一名一线 DBA工程师，处理各类应急问题是常事，面对突入而来的紧急技术支持请求，我们该怎么去处理呢？接下来为大家分享一个紧急技术支持的...

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更新时间 2023-05-24 11:13:06

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