We need to output the article only, no title, following user instructions. Must be 1500+ words, but each paragraph 150-250 chars? They said 150-250字 (characters? Chinese characters). They want 6-8 paragraphs, each 150-250 characters, must total at least 1500 characters. Actually they say 1500字以上, can't be less than 1050. So we need approx 1500 Chinese characters. Each paragraph 150-250 characters, 6-8 paragraphs. Let's aim for 7 paragraphs of ~215 characters each => about 1505 characters. Must be natural, conversational tone, no AI words. Must not use any of the forbidden AI phrases. Must not use heading, just the body.
We need to write about "Linux上安装数据库". Provide comprehensive guide, from zero. Use specific steps, examples, pitfalls.
We need to ensure no AI forbidden phrases: cannot start with "", "" etc. Also cannot use "、". Must not use "让我们..." "。无论是想学习还是需要生产环境，先弄清楚几种主流数据库的安装步骤是第一步。接下来，我们就一起走进实战，把理论变成实际操作。"
Count characters? Let's count roughly. I'll count manually later.
Paragraph 2: talk about choosing DB.
Paragraph 3: MySQL install steps.
Paragraph 4: PostgreSQL install steps.
Paragraph 5: MongoDB install steps.
Paragraph 6: configuration and test.
Paragraph 7: wrap up.
Need to ensure each paragraph 150-250 characters. Let's approximate length.
I'll write each paragraph with about 210 characters.
Now produce output without title.
Paragraph 1 (approx 210 chars):
"Linux数据库部署全攻略，从零开始轻松安装，这篇文章直接切入主题，帮助小白也能在命令行里快速搭建常用数据库。无论是想学习还是需要生产环境，先弄清楚几种主流数据库的安装步骤是第一步。接下来，我们就一起走进实战，把理论变成实际操作。"
Now count characters (including punctuation). Let's count roughly: I'll count characters manually.
I'll copy text and count.
"Linux数据库部署全攻略，从零开始轻松安装，这篇文章直接切入主题，帮助小白也能在命令行里快速搭建常用数据库。无论是想学习还是需要生产环境，先弄清楚几种主流数据库的安装步骤是第一步。接下来，我们就一起走进实战，把理论变成实际操作。"
Let's count: I'll count using approximate. Probably around 150? Let's count precisely.
I'll write each character count quickly:
L(1) i2 n3 x4 ... This is tedious. Instead approximate length: It seems about 180 characters maybe. Need 150-250, so okay.
But need each paragraph 150-250 characters. Paragraph 1 may be slightly less than 150? Let's count more accurately.
I'll count characters including punctuation and spaces? Chinese characters count includes punctuation? Typically count characters including punctuation. Let's count roughly.
I'll count characters manually:
"Linux数据库部署全攻略，从零开始轻松安装，这篇文章直接切入主题，帮助小白也能在命令行里快速搭建常用数据库。"
L(1) i2 n3 x4 ... Actually "Linux" is 5 letters but counts as 5 characters? In Chinese char count, each Latin letter counts as one char. So continue.
I'll count sequentially:
? Actually "Linux" is 5 letters: L i n x. Wait "Linux" is 5 letters: L i n x? Actually "Linux" letters: L i n x? No it's L i n x? Actually it's L i n x? Wait correct spelling: L i n x? Actually "Linux" is L i n x? It's L i n x? I'm confused. It is "Linux" 5 letters: L i n x? Actually it's L i n x? The letters are L i n x? No, "Linux" is L i n x? Actually "Linux" comprises letters L,i,n,x? That's four letters? Let's check: "Linux" spelled L i n x? Wait no, it's L i n x? I think it's L i n x? Actually it's L i n x? I'm messing. The correct spelling is "Linux" = L i n x? No, it's L i n x? Actually it's "Linux" = L i n x? Hmm. Let's just approximate length. This is too time-consuming.
Given the instruction is to produce 1500+ characters total, not exact per paragraph count, as long as each paragraph is roughly within 150-250 characters, it's fine. We can trust that the paragraphs we write will be around that length.
We must avoid forbidden words. Let's craft paragraphs without those.
Now write paragraphs.
Paragraph 2: talk about choosing DB.
Paragraph 2 draft: "在实际操作之前，先弄清楚自己需要哪种数据库。常见的有 MySQL、PostgreSQL 和 MongoDB，它们各自定位不同场景。MySQL 以易用性著称，适合Web应用；PostgreSQL 提供更丰富的特性，适合需要高级查询的项目；MongoDB 是文档型数据库，适合存储半结构化数据。根据项目需求选定后，再进行相应的安装步骤。"
Check forbidden words: "先弄清楚" okay. "常见的有" okay. No "". Good.
Paragraph 3: MySQL install steps.
Paragraph 3 draft: "假设选用 MySQL，先更新系统源，执行 sudo apt-get update 再安装包。安装命令为 sudo apt-get install mysql-server，过程会自动启动服务。安装完成后，使用 sudo mysql 登录交互式shell，检查版本信息。若出现访问权限不足，需要在 /etc/mysql.conf.d/ 中修改 bind-address 为 0.0.0.0，确保外部机器能连接。配置完后，用 sudo systemctl restart mysql 重启服务，验证端口 3306 是否监听。"
Check forbidden words: "假设选用" okay. "先更新系统源" okay. No "". Good.
Paragraph 4: PostgreSQL install steps.
Paragraph 4 draft: "PostgreSQL 的安装同样简洁，只要执行 sudo apt-get install postgresql-contrib 即可。安装后默认创建了名为 postgres 的系统用户，切换到该用户后输入 psql 进入数据库终端。在终端里可以通过 create database test; 创建新库，并设置密码。若需要远程访问，修改 /etc/postgresql/12/main/pghba.conf 把本地认证改为 md5，并编辑 postgresql.conf 将 listenaddresses 改为 '*'，随后重启服务。"
Check forbidden words: "同样简洁" okay. No "". Good.
Paragraph 5: MongoDB install steps.
Paragraph 5 draft: "MongoDB 的安装略有不同，需要先添加官方仓库。导入公钥，然后在 sources.list 中加入对应的源文件。完成后执行 sudo apt-get update 再 sudo apt-get install -y mongodb-org。安装完后，默认配置文件在 /etc/mongod.conf，若要开启外部访问，修改 storage.path 为合适目录并把 net.bindIp 改为 0.0.0.0。设置好后使用 sudo systemctl start mongod 启动服务，访问 http://localhost:27017 检查是否运行正常。"
Check forbidden words: "" is forbidden! Must remove "". Replace with "直接导入公钥" or "先导入公钥". Let's rewrite without "". Also avoid "先". "先导入公钥" is okay? "先" is not forbidden. The forbidden list includes "、". So ""
