We need to write a 1500+字 article, not less than 1050, but must be at least 1500. Must have 6-8 paragraphs, each 150-250 characters? Actually 150-250 words? The user says "每段150-250字" which means 150-250 Chinese characters. They also require overall 1500字以上, not less than 1050. So we need around 1500 Chinese characters total, divided into 6-8 paragraphs, each 150-250 characters. That implies roughly 6250 = 1500, or 7210 ~1470, need over 1500, so maybe 7 paragraphs of about 220 characters each yields ~1540 characters. That meets 1500+ and each between 150-250. We'll produce 7 paragraphs of about 220 characters each. Must not include title, only the body. Must be natural, conversational style, like chatting with a friend. Must avoid AI clichés. Must not use forbidden words. Must not use headings. Must not use "、" etc. Must not use "" etc. Must not end with summarizing concluding phrase like "". Must not use "让我们" etc. Must not use "。我们先把系统拆开看，把核心服务、缓存层、写入队列这些环节分开。每个环节都有自己的瓶颈，找出来才能对症下药。比如读请求太多，写操作堆积，就会导致响应时间飙升。把这些环节拆开后，才能有针对性地做优化。"
Now count characters (including punctuation?). Let's count manually approximate:
"数据库性能瓶颈常常藏在架构的细节里。" (13?) Let's count precisely:
数据库 (3) 性能 (2) 瓶颈 (2) 常常 (2) 藏在 (2) 架构 (2) 的 (1) 细节 (2) 里 (1) 。 (1) That's 3+2+2+2+1+1 = 18? Actually Chinese characters count each character, punctuation maybe not counted but we can approximate. Let's just approximate total length later.
But we need each paragraph 150-250 characters, not words. So we need to produce roughly 150-250 Chinese characters per paragraph. Let's aim for ~200 characters each.
We'll need to produce 7 paragraphs of ~200 characters = 1400 characters, but we need >1500 characters. So maybe 8 paragraphs of 200 each = 1600. But requirement is 6-8 paragraphs, so we can do 8 paragraphs of ~200 characters = 1600 characters, meeting >1500. Each paragraph must be 150-250 characters, so 8 paragraphs of ~200 each is fine.
Thus we can produce 8 paragraphs, each ~200 characters, total ~1600 characters.
Let's plan 8 paragraphs.
Paragraph 1: intro, echo title.
Paragraph 2: talk about overall architecture design principles.
Paragraph 3: talk about sharding and partitioning.
Paragraph 4: talk about replication and high availability.
Paragraph 5: talk about caching strategies.
Paragraph 6: talk about indexing design.
Paragraph 7: talk about query optimization and execution plans.
Paragraph 8: talk about monitoring and iterative improvement.
Each paragraph 150-250 characters.
We need to avoid forbidden words. Use short sentences, active voice.
We must count characters roughly. Let's draft each paragraph with about 200 characters.
Paragraph 1 draft (approx 200 characters):
"高性能数据库优化设计方案，从架构到索引。我们先把系统拆开看，把核心服务、缓存层、写入队列这些环节分开。每个环节都有自己的瓶颈，找出来才能对症下药。比如读请求太多，写操作堆积，就会导致响应时间飙升。把这些环节拆开后，才能有针对性地做优化。"
Now count characters. Let's count roughly:
"高性能数据库优化设计方案，从架构到索引。" = 12? Actually characters: 高(1) 性(2) 能(3) 数(4) 操(5) 系(6) 库(7) 优(8) 化(9) 设(10) 计(11) 方(12) 案(13) ， (punct) 从(14) 架(15) 构(16) 到(17) 索(18) 引(19) 。 So about 19 characters plus punctuation. Then rest.
But we need about 200 characters per paragraph, so we need to add more content.
Let's rewrite paragraph 1 to be longer, about 200 characters.
Paragraph 1 (revised):
"高性能数据库优化设计方案，从架构到索引。我们先把系统拆开看，把核心服务、缓存层、写入队列这些环节分开。每个环节都有自己的瓶颈，找出来才能对症下药。比如读请求太多，写操作堆积，就会导致响应时间飙升。把这些环节拆开后，才能有针对性地做优化。"
Now count characters roughly: Let's count manually (including punctuation maybe not needed). I'll count characters ignoring punctuation but count Chinese characters.
String: "高性能数据库优化设计方案我们先把系统拆开看把核心服务缓存层写入队列这些环节分开每个环节都有自己的瓶颈找出来才能对症下药比如读请求太多写操作堆积就会导致响应时间飙升把这些环节拆开后才能有针对性地做优化"
Let's count: I'll count characters sequentially.
高(1) 性(2) 能(3) 数(4) 操(5) 系(6) 库(7) 优(8) 化(9) 设(10) 计(11) 方(12) 案(13) 我(14) 们(15) 先(16) 把(17) 系(18) 统(19) 拆(20) 开(21) 看(22) 把(23) 核(24) 心(25) 服(26) 务(27) 缓(28) 存(29) 层(30) 写(31) 入(32) 队(33) 列(34) 这(35) 些(36) 环(37) 节(38) 分(39) 开(40) 每(41) 个(42) 环(43) 节(44) 都(45) 有(46) 自(47) 己(48) 的(49) 瓶(50) 坏(51) 找(52) 出(53) 来(54) 马(55) 上(56) 对(57) 症(58) 下(59) 药(60) 如(61) 如(62) 读(63) 请(64) 求(65) 太(66) 多(67) 写(68) 操(69) 作(70) 堆(71) 积(72) 就(73) 会(74) 导(75) 致(76) 响(77) 应(78) 时(79) 间(80) 飙(81) 升(82) 把(83) 这(84) 些(85) 环(86) 节(87) 拆(88) 开(89) 后(90) 才(91) 能(92) 有(93) 针(94) 对(95) 性(96) 地(97) 做(98) 优(99) 化(100)
So about 100 characters. Need 150-250. So we need to add more content to reach ~150-250 characters. Let's add more sentences.
Add: "我们把每层的职责明确，让系统更易维
