We need to produce a 1500+ word article, but each paragraph 150-250 words, 6-8 paragraphs. Must be natural, conversational, no AI phrases, no banned words. Must be about "Oracle如何迁移数据库" with title "Oracle数据库迁移实战指南，从规划到落地全解析" but we must not output title, only the body. Must be at least 1050 words, but we need 1500+ characters? Actually 1500字 means Chinese characters. We need 1500 Chinese characters, not words. Probably 1500 Chinese characters. They said "字数要求：必须写满1500字，不能少于1050字！". So we need about 1500 characters (Chinese). We'll produce about 1500 characters. Each paragraph 150-250 Chinese characters, 6-8 paragraphs. That yields roughly 900-2000 characters. We need to aim for about 1500 characters total. Let's produce 6 paragraphs of ~250 characters each = 1500 characters. That's fine.
We must avoid banned words: "、总的来说、让我们...、。其实核心是先把整个系统的蓝图画清楚，包括业务系统、依赖的应用、数据量规模以及目标环境的配置。没有这张蓝图，后面的每一步都容易走弯路，尤其是在老旧系统和新平台差异明显的时候。" Let's count characters.
Count: (I'll count manually).
提到Oracle数据库迁移，很多同事会先卡在“怎么开始”这块。其实核心是先把整个系统的蓝图画清楚，包括业务系统、依赖的应用、数据量规模以及目标环境的配置。没有这张蓝图，后面的每一步都容易走弯路，尤其是在老旧系统和新平台差异明显的时候。
Let's count characters: I'll count roughly:
提到(2) Oracle(6) 数据库(3) 迁移(2)，很多(2) 同事(2) 会先卡在“(2) 怎么开始”(4) 这块(2)。其实(2) 核心(2) 是先把整个系统的蓝图画清楚，包括业务系统、依赖的应用、数据量规模以及目标环境的配置。没有这张蓝图，后面的每一步都容易走弯路，尤其是在老旧系统和新平台差异明显的时候。
That's about 150? Might be less. But we need each paragraph 150-250 characters. Let's not overthink; we just need overall about 1500 characters. We'll produce 6 paragraphs each ~250 characters.
I'll craft paragraphs with ~250 characters each.
Paragraph1 ~250 chars.
Paragraph1: start with title intro.
Paragraph2: talk about assessment and inventory.
Paragraph3: talk about choosing migration method (full export/import, transportable tablespace, Data Guard, GoldenGate).
Paragraph4: talk about planning migration windows, testing in staging, using RMAN, Data Pump, etc.
Paragraph5: talk about cutover, switching applications, monitoring, fallback.
Paragraph6: talk about post-migration validation, performance tuning, documentation, lessons learned.
Now produce each paragraph of about 250 characters. Need to count roughly.
I'll write paragraph1 ~250 chars.
"提到Oracle数据库迁移，很多同事会先卡在“怎么开始”这块。其实核心是先把整个系统的蓝图画清楚，包括业务系统、依赖的应用、数据量规模以及目标环境的配置。没有这张蓝图，后面的每一步都容易走弯路，尤其是在老旧系统和新平台差异明显的时候。" Let's count characters roughly. I think it's around 180. Need 250. Add more details.
Add: "比如要确认每张表的使用频率、关键表的业务重要性，还有网络带宽和存储容量的预估。只有把这些细节摆出来，才能制定出切实可行的迁移方案。" Let's combine.
Now count approximate characters: Let's count manually quickly.
Paragraph1 full text:
提到Oracle数据库迁移，很多同事会先卡在“怎么开始”这块。其实核心是先把整个系统的蓝图画清楚，包括业务系统、依赖的应用、数据量规模以及目标环境的配置。没有这张蓝图，后面的每一步都容易走弯路，尤其是在老旧系统和新平台差异明显的时候。比如要确认每张表的使用频率、关键表的业务重要性，还有网络带宽和存储容量的预估。只有把这些细节摆出来，才能制定出切实可行的迁移方案。
Now count characters: I'll approximate: each Chinese char counts as one. Let's count quickly:
提到(2) Oracle(6) 数据库(3) 迁移(2)，很多(2) 同事(2) 会先卡在“(2) 怎么开始”(4) 这块(2)。其实(2) 核心(2) 是先把整个系统的蓝图画清楚，包括业务系统、依赖的应用、数据量规模以及目标环境的配置。没有这张蓝图，后面的每一步都容易走弯路，尤其是在老旧系统和新平台差异明显的时候。比如要确认每张表的使用频率、关键表的业务重要性，还有网络带宽和存储容量的预估。只有把这些细节摆出来，才能制定出切实可行的迁移方案。
Probably around 250-300 characters. Good.
Paragraph2: talk about inventory and assessment.
"第一步，把现有库的清单列出来，分别标记版本、字符集、参数文件以及使用的存储引擎。有些库可能已经跑了十几年，里面的对象名甚至带有历史遗留的缩写，这些都会在迁移时产生麻烦。通过系统视图或者第三方工具把对象、索引、约束、序列等全部统计出来，能让迁移脚本更精准，避免遗漏。与此同时，要评估数据量增长趋势，判断在目标平台上能否满足未来两三年的业务需求。" Count roughly.
Paragraph3: talk about migration methods.
"在评估完现状后，就要决定采用哪种迁移方式。如果数据量不大，直接使用expdp/impdp导出导入往往最直接；但对于几百GB甚至TB级的库，传统导出往往耗时且难以保证实时性。此时可以考虑使用RMAN增量备份恢复、或是Oracle GoldenGate实时同步，再配合 Data Guard 实现业务切换。不同的方案在资源占用、数据一致性和停机时间上差别很大，需要根据业务容忍度做权衡。" Count.
Paragraph4: talk about planning cutover and testing.
"迁移的核心环节是测试。先在独立的测试集群里跑一遍完整的迁移脚本，验证表空间、用户权限、序列值以及应用连接是否都能正常。如果发现字符集不匹配或者慢查询变慢，这时候及时调整参数而不是在生产环境直接改。完成初步验证后，安排一次窄窄的切换窗口，通常是凌晨或业务低峰期，把业务流量切到新库后，先跑几轮监控确认无误再正式对外开放。" Count.
Paragraph5: talk about post-cutover monitoring and fallback.
"切换后，监控是必不可少的。观察数据库的日志、性能指标以及应用的响应时间，尤其是那些依赖于特定数据库特性的业务。如果出现异常，要有明确的回滚方案，比如准备好上一次的备份快照，或者在GoldenGate里保留的同步日志，这样能在短时间内恢复到迁移前的状态。同时，要把迁移过程中的经验教训记下来，形成迁移手册，供以后参考。" Count.
Paragraph6: talk about final validation, documentation, lessons learned.
"完成迁移后要做一次全面的校验，包括数据完整性、业务报表对比以及用户反馈。把所有的配置文件、参数调
