SQL请求的相关内容

文章 2024-08-26 来自：开发者社区

慢sql治理问题之下游 Task 频繁请求 JobMaster 导致 RPC 超时的问题你们是如何解决的

问题一：在并发度大且有 shuffle 的作业中，为什么会出现 RPC 超时和 JobMaster 上大量 requestPartitionState 请求的情况？在并发度大且有 shuffle 的作业中，为什么会出现 RPC 超时和 JobMaster 上大量 requestPartitionState 请求的情况？参考回答：在并发度大且有 s...

文章 2024-07-29 来自：开发者社区

云原生数据仓库使用问题之控制JDBC方式请求的SQL大小限制的参数是什么

问题一：云数据仓库ADB慢查询表中，shuffle_size 该列表示什么，是哪一部分的shuffl ? 云数据仓库ADB中，慢sql查询是什么？参考答案：慢SQL查询通常是指执行耗时长、消耗资源多的SQL语句，常见的资源消耗包括CPU、内存和磁盘I/O。以下是对阿里云ADB数据库中几种典型慢查询及其成因分析：消耗CPU的慢查询原因可能包...

问答 2024-06-27 来自：开发者社区

PolarDB业务有这样的sql，关了读请求，还会一直发主库是吗？

文章 2024-06-18 来自：开发者社区

大家好，我是阿萨。安全测试常见的SQL注入，跨站脚本攻击以及跨站请求伪造这三个经常有人分不清楚。今天就澄清一下概念，并举例说明这三个分别是什么。 SQL注入 (SQL Injection) SQL注入是一种安全漏洞，攻击者通过在输入字段中插入或 "注入" SQL代码，来操作或操纵后端数据库。如果一个应用程序没有正确地处理这些输入，这可能会导致未授权的数据查看，数据操纵，甚至是完全的数据库控制...

文章 2023-09-27 来自：开发者社区

OBCP第三章 SQL引擎高级技术-SQL请求执行流程

SQL请求执行流程-词法/语法解析Parser（语法/语法解析模块）在收到用户发送的SQL请求串后，Parser会将字符串分成一个个的“单词”，并根据预先设定好的语法规则解析整个请求，将SQL请求字符串转换成带有语法结构信息的内存数据结构，我们称为“语法树”（Syntax Tree）为了加速SQL请求的处理速度，OceanBase对SQL请求采用了特有的“快速参数化”，以加速查找plan cac....

问答 2023-08-27 来自：开发者社区

哪位大佬知道大数据计算MaxCompute sql整段注释的语法吗?没查到,请求指教,谢谢？

哪位大佬知道大数据计算MaxCompute sql整段注释的语法吗?没查到,请求指教,谢谢

文章 2023-06-30 来自：开发者社区

java.sql.SQLTimeoutException: ORA-01013: 用户请求取消当前的操作

问题背景：在应用中配置了第三方数据源，启动时未报错。但是当使用应用中的数据集管理功能去加载配置的第三方数据源的所有视图时，一直报如下错误：2022-08-12 09:57:44 ERROR DruidDataSource: create connection SQLException, url: jdbc:oracle:thin:@10.254.100.115:1521:ORCL, ....

文章 2023-05-30 来自：开发者社区

java202303java学习笔记第四十七天-请求-基础操作-动态sql-案例1

文章 2023-05-30 来自：开发者社区

java202303java学习笔记第四十七天-请求-基础操作-动态sql之2

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