[{"data":1,"prerenderedAt":133},["ShallowReactive",2],{"article-intro":3,"mdc--1a1w3e-key":15},{"_path":4,"slug":5,"title":6,"description":7,"date":8,"tags":9,"type":12,"cover":13,"content":14},"\u002Fknowledge\u002Fintro","intro","数据库迁移入门","介绍企业数据库迁移的常见挑战与应对策略, 适合初次接触迁移项目的读者。","2026-06-01",[10,11],"迁移","入门","article",null,"\n# 数据库迁移入门\n\n企业数据库迁移是高风险、高复杂度的工程活动。本文介绍常见挑战与应对策略。\n\n## 常见挑战\n\n- 数据量大, 停机窗口短\n- 异构数据库之间的类型映射差异\n- 应用层 SQL 方言不兼容\n- 回滚方案设计不足\n\n## 应对策略\n\n1. **充分评估**: 使用结构对比工具梳理 schema 差异。\n2. **分批迁移**: 先迁移非核心表, 验证链路稳定后再切核心表。\n3. **双写并行**: 迁移期间新旧库双写, 便于回滚。\n4. **自动化校验**: 迁移结束后做行数、关键字段 checksum 校验。\n\n```java\npublic class MigrationChecker {\n    public boolean checksum(String table) {\n        \u002F\u002F 计算源库和目标库 checksum\n        return true;\n    }\n}\n```\n\n更多实战内容请关注后续专栏。\n",{"data":16,"body":17},{},{"type":18,"children":19},"root",[20,27,33,39,64,69,114,128],{"type":21,"tag":22,"props":23,"children":24},"element","h1",{"id":6},[25],{"type":26,"value":6},"text",{"type":21,"tag":28,"props":29,"children":30},"p",{},[31],{"type":26,"value":32},"企业数据库迁移是高风险、高复杂度的工程活动。本文介绍常见挑战与应对策略。",{"type":21,"tag":34,"props":35,"children":37},"h2",{"id":36},"常见挑战",[38],{"type":26,"value":36},{"type":21,"tag":40,"props":41,"children":42},"ul",{},[43,49,54,59],{"type":21,"tag":44,"props":45,"children":46},"li",{},[47],{"type":26,"value":48},"数据量大, 停机窗口短",{"type":21,"tag":44,"props":50,"children":51},{},[52],{"type":26,"value":53},"异构数据库之间的类型映射差异",{"type":21,"tag":44,"props":55,"children":56},{},[57],{"type":26,"value":58},"应用层 SQL 方言不兼容",{"type":21,"tag":44,"props":60,"children":61},{},[62],{"type":26,"value":63},"回滚方案设计不足",{"type":21,"tag":34,"props":65,"children":67},{"id":66},"应对策略",[68],{"type":26,"value":66},{"type":21,"tag":70,"props":71,"children":72},"ol",{},[73,84,94,104],{"type":21,"tag":44,"props":74,"children":75},{},[76,82],{"type":21,"tag":77,"props":78,"children":79},"strong",{},[80],{"type":26,"value":81},"充分评估",{"type":26,"value":83},": 使用结构对比工具梳理 schema 差异。",{"type":21,"tag":44,"props":85,"children":86},{},[87,92],{"type":21,"tag":77,"props":88,"children":89},{},[90],{"type":26,"value":91},"分批迁移",{"type":26,"value":93},": 先迁移非核心表, 验证链路稳定后再切核心表。",{"type":21,"tag":44,"props":95,"children":96},{},[97,102],{"type":21,"tag":77,"props":98,"children":99},{},[100],{"type":26,"value":101},"双写并行",{"type":26,"value":103},": 迁移期间新旧库双写, 便于回滚。",{"type":21,"tag":44,"props":105,"children":106},{},[107,112],{"type":21,"tag":77,"props":108,"children":109},{},[110],{"type":26,"value":111},"自动化校验",{"type":26,"value":113},": 迁移结束后做行数、关键字段 checksum 校验。",{"type":21,"tag":115,"props":116,"children":122},"pre",{"className":117,"code":119,"language":120,"meta":121},[118],"language-java","public class MigrationChecker {\n    public boolean checksum(String table) {\n        \u002F\u002F 计算源库和目标库 checksum\n        return true;\n    }\n}\n","java","",[123],{"type":21,"tag":124,"props":125,"children":126},"code",{"__ignoreMap":121},[127],{"type":26,"value":119},{"type":21,"tag":28,"props":129,"children":130},{},[131],{"type":26,"value":132},"更多实战内容请关注后续专栏。",1787799116021]