mysql数据库的相关内容

文章 2022-12-01 来自：开发者社区

MySQL-数据库（5）

本文主要讲述了MySQL的并发控制与事务的隔离级别。3.5并发控制与事务的隔离级别3.5.1事务3.5.1.1事务基础知识事务管理的意义：保证数据操作的完整性；事务的特性(ACID)：原子性：事务的整个操作是一个整体，不可以分割，要么全部成功，要么全部失败；一致性：事务操作的前后，数据表中的数据没有变化（按示例中解释为A转钱给B的前后两个人钱的总金额不会改变）；隔离性：事务操作是相互隔离不受影响....

文章 2022-12-01 来自：开发者社区

MySQL-数据库（4）

本文主要讲述了MySQL的恢复、日志、备份以及关于用户的授权操作。3.3恢复、日志、备份动态转储静态转储海量转储动态海量转储静态海量转储增量转储动态增量转储静态增量转储逻辑备份工具：mysqldump物理备份工具：mysqlbackup(仅限商用版)日志工具：mysqlbinlog还原工具：mysql管理工具：mysqladmin3.3.1逻辑备份 - mysqldumpmysqldump -....

文章 2022-12-01 来自：开发者社区

MySQL-数据库（3）

本文主要讲述了MySQL的函数和存储过程。3.2函数&存储过程3.2.1函数declare 变量名类型; # 定义变量 select id into 变量名 from table; # 将table表中的id列值赋给变量。CREATE FUNCTION ...

文章 2022-12-01 来自：开发者社区

MySQL-数据库（2）

本文主要讲述了MySQL的基础的CRUD，以及视图和索引。SQL功能操作符DDL数据定义CREATE ALTER DROP DML数据查询SELECT 数据更新INSERT UPDATE DELETEDCL数据控制GRANT REVOKE3.1增删改查3.1.1数据库-- 【增】创建名为test的数据库，默认字符集设置为 utf8，排序规则设置为...

文章 2022-12-01 来自：开发者社区

MySQL-数据库（1）

1.绪论1.1系统概述1.1.1 基本概念数据库系统（DataBase System,DBS）是由数据库（DataBase System,DB）、数据库管理系统（DataBase Management System,DBMS）、应用程序和数据库管理员（DataBase Administrator,DBA）组成的存储、管理、处理和维护数据的系统。1.1.2数据库系统特点数据结构化数据共享性高、冗.....

文章 2022-12-01 来自：开发者社区

MySQL基础-创建数据库

DDL查询所有数据库show databases ;网络异常，图片无法展示|查询当前数据库select database() ;网络异常，图片无法展示|创建数据库create database [ if not exists ] 数据库名 [ default charset 字符集 ] [ collate 排序规则 ] ;if not exists当数据库不存在时创建，存在时不创建efault....

问答 2022-11-28 来自：开发者社区

RDS MySQL升级数据库版本？

文章 2022-11-28 来自：开发者社区

MySQL笔记 | 4.MySQL数据库设计-字段类型

一、整型类型有哪些？signed表示这个值是有符号的，数据库的默认选项。类型占用空间最小值~最大值（signed）最小值~最大值（unsigned）TINYINT1-128~1270~255SMALLINT2-32768~327670~65535MEDIUMINT3-8388608~83886070~16777215INT4-2147483648~21474836470~4294967295BI....

文章 2022-11-27 来自：开发者社区

PolarDB MySQL数据库升级策略

背景数据库的可用性对于客户是至关重要的，根据CAP理论，分布式和一致性、可用性只能二选一，所以在云原生数据库（依赖多副本）或者分布式TP系统中，大多都选择牺牲一些一致性来保证分布式和可用性，足以看出可用性的地位是及其重要的，所以任何数据库内核都会针对可用性做很多特性改进，...

问答 2022-11-27 来自：开发者社区

各位大佬，我用flinkcdc读取mysql，etl之后写入pgsql数据库，每次隔天凌晨就报错。

各位大佬，我用flinkcdc读取mysql，etl之后写入pgsql数据库，每次隔天凌晨就报错。java.lang.RuntimeException: One or more fetchers have encountered exception at org.apache.flink.connector.base.source.reader.fetcher.SplitFetcherManag....

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