The user wants a full article with title already given (they said "标题已确定为「数据库查询效率提升，五大优化方案详解」", and request: "直接输出正文，不要标题". So we must output the article content only, no title. Must be 1500+ characters? Actually they said "字数要求：必须写满1500字，不能少于1050字！" So must be at least 1500 Chinese characters (words?). They said 1500字 (characters). Must be at least 1500 characters, not 1500 words. And cannot be less than 1050 characters. So we need to produce at least 1500 characters. Also they want 6-8 paragraphs, each 150-250 characters. Let's compute: 6-8 paragraphs 150-250 each. If we choose 7 paragraphs each around 210 characters, total ~1470 characters, slightly below 1500. Need at least 1500 characters. Let's aim for 7 paragraphs of about 220-230 characters each => 7225 = 1575 characters, satisfying >1500. Also each paragraph must be 150-250 characters, so 225 is okay.
We need to avoid AI markers. Must be natural, conversational, no bullet points, no numbered lists, no parentheses. Must not use forbidden transition words like "、总的来说". Must not use "然而". Must not use "因此". Must not use "同时". Must not use "但是". Must not use "因此". Must avoid "而且". Actually "而且" is not prohibited, but they said "不得包含以下AI常见的过渡词衔接段落：‘然而、因此、同时、但是、而且’". So cannot use "但是" as transition between paragraphs. But we can use "但"? That is a conjunction but maybe considered similar? They said "但是". Might be okay to use "但"? Safer to avoid "但是". Also avoid "而且". Also avoid "然而". Also avoid "因此". Also avoid "同时". Also avoid "、总的来说". So we must not use these words. Also avoid parentheses. Also avoid bullet points, numbered lists.
We need to write 6-8 paragraphs, each 150-250 characters. Let's aim for 7 paragraphs of ~225 characters each. Must start with opening that echoes title, and end with closing that echoes title.
We need to embed the five optimization solutions. They said "五大优化方案详解". So we need to discuss five solutions. We can embed them across paragraphs, but not as a list. Must not use numbered list or bullet points. So we can embed each solution in separate paragraph maybe, but we need to avoid using "第一、第二" etc. We can just describe them in prose.
We must not use any of the forbidden words. Also avoid "不少于" etc? That's fine. Must not use "不得". That's okay.
We must not use parentheses. So cannot use ( ) anywhere. Must avoid parentheses characters. So cannot use parentheses for asides. Must avoid them entirely.
We must avoid using "比如". That's okay, not prohibited. But must avoid "例如"? Not prohibited. It's okay.
We must avoid using "例如" maybe okay, but better not use parentheses.
We must avoid using "（" and "）". So cannot use parentheses. Must write without them.
We must not use "标题已确定" etc. Just output article.
Now craft paragraphs.
Paragraph 1: Opening, echo title, introduce topic.
Paragraph 2: Discuss first optimization: indexing strategies.
Paragraph 3: Discuss second: query rewriting and execution plan.
Paragraph 4: Discuss third: partition pruning and sharding.
Paragraph 5: Discuss fourth: caching and materialized views.
Paragraph 6: Discuss fifth: hardware and configuration tuning.
Paragraph 7: Closing, reflect on title.
Each paragraph 150-250 characters. Let's count approximate characters.
We need to count Chinese characters, including punctuation? Usually characters include punctuation? Probably yes. We'll aim for around 225 characters each.
Let's craft paragraph 1 ~225 characters.
"在日常开发中，数据库查询往往成为系统瓶颈的根源。标题所言的五大优化方案，正是帮助我们在真实业务场景里，把慢查询变成毫秒级响应的关键所在。接下来，我会带你逐一拆解这些实用技巧，看看它们到底能为你的项目带来多少提升。"
Now count characters: Let's count manually.
"在日常开发中，数据库查询往往成为系统瓶颈的根源。" -> count characters: 在(1)日2常3开4发5中6，7数8据9库10查11询12往13往14成15为16系17统18瓶19颈20的21根22源23。 That's 23 characters? Actually punctuation counts as characters? Usually yes. But we can approximate. Let's count more precisely.
I'll write paragraph and then count roughly.
在日常开发中，数据库查询往往成为系统瓶颈的根源。标题所言的五大优化方案，正是帮助我们在真实业务场景里，把慢查询变成毫秒级响应的关键所在。接下来，我会带你逐一拆解这些实用技巧，看看它们到底能为你的项目带来多少提升。
Now count characters including punctuation. Let's count manually:
在(1)日2常3开4发5中6，7数8据9库10查11询12往13往14成13? Wait we need to recount accurately.
Better to approximate length; we just need total around 1500 characters across 7 paragraphs. So each paragraph around 225 characters. We can approximate but need to ensure at least 1500 total characters. It's okay if slightly more.
We must avoid AI markers. Use natural language.
We must not use "比如". We can use "比如" is okay? Not prohibited. But fine.
We must avoid parentheses. So we cannot use "例如". That's okay.
We must avoid "比如"? Not prohibited. But okay.
We must avoid "例如"? Not prohibited. But okay.
We must avoid "比如"? Not prohibited. It's fine.
But we must avoid parentheses characters "(" and ")". So we cannot use them. So we must not use parentheses anywhere.
Also cannot use "（" or "）". So avoid any parentheses.
We must avoid "（" and "）". So we cannot use parentheses for asides.
We must avoid "例如". That's okay, but "例如" does not contain parentheses. It's fine.
But we must avoid using parentheses characters. So we cannot embed any parentheses.
Now craft paragraphs without parentheses.
Paragraph 2: discuss indexing.
"第一个突破点在于索引的使用方式。合理的单列索引能够让条件过滤瞬间定位，而复合索引则把多个过滤条件压缩成一条路径。但要注意避免过度创建索引，因为每新增一个索引都会在写入时产生额外开销。实际项目里，把查询里最常出现的字段放在前缀位置，往往能看到查询计划从全表扫描转向定向读取的明显变化。"
But we must not use "第一个". That's okay. But we cannot use "". That's prohibited. So we cannot use "". We can use "第一个"? Not prohibited. The prohibition is only for "、总的来说". So "第一个" is okay. However we must avoid using "但是". So we cannot use "但是". In paragraph 2 we used "但要注意". That's okay because "但" is not prohibited. Only "但是" is prohibited. So we can use "但". Good.
But we must avoid "而且". Also prohibited. So we cannot use "而且". Use "同时"? Also prohibited. So avoid "同时". Use "还" maybe.
We must avoid "然而". Also prohibited.
We must avoid "因此". Also prohibited.
We must avoid "同时". Also prohibited.
We must avoid "但是". Also prohibited.
So we must not use "但是". Use "但". That's okay.
Now paragraph 2 must be 150-250 characters. Let's count approximate length.
"第一个突破点在于索引的使用方式。合理的单列索引能够让条件过滤瞬间定位，而复合索引则把多个过滤条件压缩成一条路径。但要注意避免过度创建索引，因为每新增一个索引都会在写入时产生额外开销。实际项目里，把查询里最常出现的字段放在前缀位置，往往能看到查询计划从全表扫描转向定向读取的明显变化。"
Now count characters roughly. Let's count quickly.
I'll count characters including punctuation.
"第一个突破点在于索引的使用方式。" -> count: 第1个2突3破4点5在6于7索8引9的10使11用12方13式14。 That's 14 characters? Actually each Chinese character counts as one. Let's approximate total length later.
But we need each paragraph 150-250 characters. This paragraph might be around 150 characters? Let's approximate: It seems maybe 150-180. Let's count more precisely.
I'll write the paragraph and then count characters.
第一个突破点在于索引的使用方式。合理的单列索引能够让条件过滤瞬间定位，而复合索引则把多个过滤条件压缩成一条路径。但要注意避免过度创建索引，因为每新增一个索引都会在写入时产生额外开销。实际项目里，把查询里最常出现的字段放在前缀位置，往往能看到查询计划从全表扫描转向定向读取的明显变化。
Now count characters manually (
