We need to write article without title. Must be 1500+ characters? Actually word count: must be at least 1500 characters? The instruction says "字数要求：必须写满1500字，不能少于1050字！" It says "字数要求：必须写满1500字，不能少于1050字！". That's contradictory: write full 1500 characters? Actually "字数要求：必须写满1500字，不能少于1050字！" Means must be at least 1500 characters? Or at least 1500 words? Usually Chinese "字" means characters, but context maybe words. They also say "必须达到1500字以上". So we need at least 1500 characters (Chinese characters). Must be 1500+ characters, not less than 1050. Also struct: 6-8 paragraphs, each 150-250 characters. So total characters 6-8 150-250 = ~900-2000. To meet >=1500, need maybe 7 paragraphs of ~215 characters each -> about 1505 characters. So we need 7 paragraphs each about 150-250 characters, total >=1500 characters. Let's aim for 7 paragraphs, each around 220 characters. That's about 1540 characters. Must not include title. Must start with intro referencing title. End with concluding referencing title.
We must avoid AI pattern words: cannot use "、让我们...". Also cannot use "、". Also cannot use transition words "、". So we need to avoid those. Use natural flow.
Paragraph length 150-250 characters. We'll write about 220 characters each.
We need 7 paragraphs.
Let's craft paragraphs of roughly 220 Chinese characters each.
Paragraph 1: intro, hook referencing title.
Paragraph 2: common pitfalls in schema design, like too many tables, wrong data types, missing indexes.
Paragraph 3: naming conventions, avoid ambiguous names.
Paragraph 4: normalization vs denormalization trade-offs.
Paragraph 5: index strategy, covering types, over-indexing.
Paragraph 6: query patterns, avoid N+1, use proper joins.
Paragraph 7: summary tying back to title, concluding observation.
We must ensure no transition words like "", "". Use natural flow.
We must not use "". Avoid "". Also avoid "". Avoid "". So we can use "比如", "举个例子", "可以", "通常". Avoid "". Use simple.
Paragraph length count: Let's approximate characters. Chinese characters count includes punctuation? Usually punctuation counts as characters but okay. We'll aim for about 220 characters each.
Let's write paragraph 1 ~220 characters.
Paragraph 1: "在日常开发中，数据库设计和优化往往决定了系统能否稳住高并发。题目里提到的‘数据库设计避坑指南，优化实战提升系统性能’，其实就是把那些踩坑的经验拆解成可操作的步骤。下面聊聊几个常见误区以及对应的调优技巧，帮助大家在真实项目里快速提升性能。"
Count characters: Let's count roughly. I'll count:
"在日常开发中，数据库设计和优化往往决定了系统能否稳住高并发。" (31?) Let's just approximate length. Need about 220 characters per paragraph. We'll write longer.
Better to write each paragraph about 220 characters. Let's count manually approximate.
I'll write paragraph 1 text and then count roughly.
"在日常开发中，数据库设计和优化往往决定了系统能否稳住高并发。题目里提到的‘数据库设计避坑指南，优化实战提升系统性能’，其实就是把那些踩坑的经验拆解成可操作的步骤。下面聊聊几个常见误区以及对应的调优技巧，帮助大家在真实项目里快速提升性能。"
Let's count characters (excluding spaces). I'll count:
在(1)日(2)常(3)开(4)发(5)中(6)，数(7)据(8)库(9)设(10)计(11)和(12)优(13)化(14)往(15)样(16)决(17)定(18)了(19)系(20)统(21)能(22)否(23)稳(24)住(25)高(26)并(27)发(28)。题(29)目(30)里(31)提(32)到(33)的(34)‘数(35)据(36)库(37)设(38)计(39)避(40)坑(41)指(42)南(43)，优(44)化(45)实(46)战(47)提(48)升(49)系(50)统(51)能(52)力(53)，实(54)际(55)上(56)是(57)把(58)那(59)些(60)踩(61)坑(62)的(63)经(64)验(65)拆(66)解(67)成(68)可(69)操(70)作(71)的(72)步(73)骤(74)。下(75)面(76)聊(77)聊(78)几(79)个(80)常(81)见(82)误(83)区(84)以(85)及(86)对(87)应(88)的(89)调(90)优(91)技(92)巧(93)，帮(94)助(95)大(96)家(97)在(98)真(99)实(100)项(101)目(102)里(103)快(104)速(105)提(106)升(107)能(108)力(109)。"
That's about 109 characters, far short. Need 150-250. So need longer paragraph. Let's expand.
Add more sentences: "在实际项目里，往往会遇到表结构臃肿、字段类型不匹配、索引缺失等情况，这些都会直接导致查询变慢、资源浪费。下面我们先从设计层面入手，看看怎么避免这些坑。"
Add that to reach ~220 characters.
Let's rewrite paragraph 1 with about 220 characters.
"在日常开发中，数据库设计和优化往往决定了系统能否稳住高并发。题目里提到的‘数据库设计避坑指南，优化实战提升系统性能’，其实就是把那些踩坑的经验拆解成可操作的步骤。实际项目常见的表结构臃肿、字段类型不匹配、索引缺失等问题，都会直接导致查询变慢、资源浪费。下面我们先从设计层面入手，看看怎么避免这些坑。"
Now count roughly. Let's approximate characters: earlier we had 109, add more: "实际项目常见的表结构臃肿、字段类型不匹配、索引缺失等问题，都会直接导致查询变慢、资源浪费。" That's about 38 characters? Let's count: 实际(1)项(2)目(3)常(4)见(5)的(6)表(7)结(8)构(9)臃(10)肿(11)、字(12)段(13)类(14)型(15)不(16)匹(17)配(18)、索(19)引(20)缺(21)失(22)等(23)问(24)题(25)，都(26)会(27)直(28)接(29)导(30)致(31)查(32)询(33)变(34)慢(35)、资(36)源(37)浪(38)费(39)。 That's 39 characters. Then "下面我们先从设计层面入手，看看怎么避免这些坑。" about 18 characters. So total ~109+39+18 = 166 characters. Still short of 150-250? Actually requirement each paragraph 150-250 characters, so 166 is okay (within 150-250). But we need each paragraph 150-250 characters, not less than 150. 166 is fine. But we need overall >=1500 characters across all paragraphs. 7 paragraphs ~166 = 1162, not enough. So we need each paragraph longer, maybe 220 characters. So we need to expand each paragraph to around 220 characters.
Thus we need to write each paragraph with about 220 characters. Let's aim for 220 characters each. So total 7*220 = 1540 characters, meeting >=1500.
Thus each paragraph must be 150-250 characters, we can aim for 220.
Thus we need to craft each paragraph with about 220 characters.
Let's write paragraph 1 ~220 characters.
