We need to produce article text (no title) with 6-8 paragraphs, each 150-250 Chinese characters. Must achieve at least 1500 characters total, cannot be less than 1050. Actually requirement: must write enough to be >=1500 characters? It says "必须写满1500字，不能少于1050字！" That's Chinese characters count? They said "字数要求：必须写满1500字，不能少于1050字！" So need at least 1500 characters, but also not less than 1050? That's contradictory; but likely they want at least 1500 characters, but also cannot be less than 1050, which is automatically satisfied if >=1500. So we need to produce at least 1500 Chinese characters.
We need 6-8 paragraphs, each 150-250 characters. Let's target 7 paragraphs, each around 210-220 characters, to reach about 1540-1580 characters. Must not include title. Must be natural conversational style, no AI-sounding phrases. Avoid banned words. Avoid headings. Use short sentences, active voice.
Paragraph count 6-8, we can do 7 paragraphs.
Each paragraph 150-250 characters. Let's aim for ~220 characters each.
Need to ensure total >=1500 characters. 7*220 = 1540, good.
Now craft paragraphs on MySQL index optimization.
Paragraph 1: intro referencing title, presenting problem of slow queries, importance of index.
Paragraph 2: first tip: proper column order and composite index.
Paragraph 3: second tip: avoid over-indexing, selective queries.
Paragraph 4: third tip: cover index for ORDER BY/LIMIT.
Paragraph 5: fourth tip: using EXPLAIN to verify.
Paragraph 6: fifth tip: remove unnecessary functions on indexed columns.
Paragraph 7: conclusion reflecting on title.
Now write each paragraph in Chinese, natural tone, ~220 characters.
We must count characters roughly. Let's draft.
Paragraph 1: "大家经常会遇到这样的情况，SQL执行得特别慢，查看慢查询日志，发现是某个表的查询没有走索引。其实大多数性能瓶颈都和索引有关，尤其是在数据量稍大一点的系统里。今天我们就来聊聊 MySQL 索引优化的实战技巧，帮助你在实际项目里快速提升查询速度。" Count characters? Let's count approximate: We'll need about 220 characters. Let's count manually later.
But we can approximate. We'll craft each paragraph around 200-230 characters.
Let's write paragraphs then count characters roughly.
I'll write paragraph 1:
"大家经常会遇到这样的情况，SQL执行得特别慢，查看慢查询日志，发现是某个表的查询没有走索引。其实大多数性能瓶颈都和索引有关，尤其是在数据量稍大一点的系统里。今天我们就来聊聊 MySQL 索引优化的实战技巧，帮助你在实际项目里快速提升查询速度。" Let's count characters (including punctuation?). Chinese characters count includes punctuation? Probably characters count includes all characters. Let's count:
大家(2)经常(2)会(1)遇到(2)这(1)样(1)的(1)情(1)况(1)，SQL(3)执行(2)得(1)特别(2)慢(1)，查看(2)慢查询(3)日志(2)，发现(2)是(1)某(1)个(1)表(1)的(1)查询(2)没(1)有(1)走(1)索(1)引(1)。(1)其实(2)大多数(2)性能(2)瓶颈(2)都(1)和(1)索引(2)有关(2)，尤其是(2)在(1)数(1)据(1)量(1)稍(1)大(1)一(1)点(1)的(1)系(1)统(1)里(1)。(1)今(1)天(1)我(1)们(1)就(1)来(1)聊(1)MySQL(5)索引(2)优化(2)的(1)实战(2)技巧(2)，帮(1)助(1)你(1)在(1)实(1)际(1)项(1)目(1)里(1)快(1)速(1)提升(2)查询(2)速(1)度(1)。(1)
Now sum: Let's add numbers:
2+2+1+1+3+2+1+2+3+2+2+1+1+1+2+2+2+1+1+1+5+2+2+1+1+2+2+1+1+1
That's messy. Let's approximate length maybe ~300 characters? Actually seems longer. Let's just trust that each paragraph will be around 200-250 characters. We can adjust.
But we need to ensure each paragraph 150-250 characters. Let's aim for about 200 characters each.
We can count roughly by Chinese characters count: typical Chinese sentence about 20 characters. We'll craft sentences of moderate length.
Better to write each paragraph as 7-8 short sentences, each about 20-30 characters.
We'll produce 7 paragraphs of about 210 characters each.
Now write paragraphs with about 210 characters.
Paragraph 1: "大家经常会遇到SQL执行特别慢的情况，查看慢查询日志会发现很多查询没有走索引。其实大多数性能瓶颈都和索引有关，尤其是数据量稍大的系统。今天我们就聊聊MySQL索引优化的实战技巧，帮助你在项目里快速提升查询速度。" Let's count characters:
大家(2)经常(2)会(1)遇到(2)SQL(3)执行(2)特别(2)慢(1)的(1)情(1)况(1)，查看(2)慢查询(3)日志(2)会(1)发(1)现(1)多(1)少(1)个(1)查询(2)没(1)有(1)走(1)索(1)引(1)。(1)其实(2)大多数(2)性能(2)瓶颈(2)都(1)和(1)索引(2)有(1)关(1)，尤其(2)在(1)数(1)据(1)量(1)稍(1)大(1)的(1)系(1)统(1)。(1)今(1)天(1)我(1)们(1)就(1)聊(1)MySQL(5)索引(2)优化(2)的(1)实战(2)技巧(2)，帮(1)助(1)你(1)在(1)项(1)目(1)里(1)快(1)速(1)提升(2)查询(2)速(1)度(1)。(1)
Now sum approximate characters: Let's sum quickly: 2+2+1+2+3+2+2+1+1+1+2+3+2+1+1+1+2+2+2+1+1+2+1+5+2+2+1+1+2+1+1 = Let's add: 2+2=4, +1=5, +2=7, +3=10, +2=12, +2=14, +1=15, +1=16, +1=17, +1=18, +1=19, +2=21, +3=24, +2=26, +1=27, +1=28, +1=29, +1=30, +1=31, +2=33, +1=34, +2=36, +2=38, +2=40, +1=41, +1=42, +2=44, +1=45, +2=47, +1=48, +2=50, +1=51, +2=53, +1=54, +2=55, +1=56, +2=57, +1=58, +2=60, +1=61, +2=62, +1=63, +2=65, +1=66, +2=67, +1=68, +2=70, +1=70? Actually we need systematic count. This is too tedious.
Given we don't need exact count, just ensure each paragraph roughly 150-250 characters. We'll trust that our paragraphs are within that range. The overall total will be >1500 characters.
Now write paragraphs.
Paragraph 2: talk about composite index column order.
Paragraph 3: talk about selective queries and covering index.
