https://linuxiexiu.github.io/docs/%E6%95%B0%E6%8D%AE%E5%BA%93/Oracle/Recent content in Oracle数据库 on Linux邪修Hugozh© 2024 Linux邪修https://linuxiexiu.github.io/docs/%E6%95%B0%E6%8D%AE%E5%BA%93/Oracle/Oracle%E5%B8%B8%E7%94%A8%E5%91%BD%E4%BB%A4%E6%80%BB%E7%BB%93/Mon, 01 Jan 0001 00:00:00 +0000https://linuxiexiu.github.io/docs/%E6%95%B0%E6%8D%AE%E5%BA%93/Oracle/Oracle%E5%B8%B8%E7%94%A8%E5%91%BD%E4%BB%A4%E6%80%BB%E7%BB%93/<p>Oracle 数据库与 MySQL 在架构、SQL 语法和运维命令上有显著区别。Oracle 更强调<strong>实例与数据库的分离</strong>、<strong>表空间管理</strong>以及<strong>PL/SQL 的强大功能</strong>。</p> <p>以下是 Oracle 数据库从<strong>安装配置、用户管理、日常维护</strong>到<strong>核心 SQL 操作</strong>的全流程指南。</p> <hr> <h3 id="第一阶段环境准备与连接-oracle-特色">第一阶段：环境准备与连接 (Oracle 特色)<a class="anchor" href="#%e7%ac%ac%e4%b8%80%e9%98%b6%e6%ae%b5%e7%8e%af%e5%a2%83%e5%87%86%e5%a4%87%e4%b8%8e%e8%bf%9e%e6%8e%a5-oracle-%e7%89%b9%e8%89%b2">#</a></h3> <p>Oracle 不像 MySQL 那样直接 <code>mysql -u root -p</code>。你需要先配置环境变量，并理解 <strong>SID</strong> (实例名) 或 <strong>Service Name</strong> (服务名)。</p> <h4 id="1-切换用户与配置环境-linux">1. 切换用户与配置环境 (Linux)<a class="anchor" href="#1-%e5%88%87%e6%8d%a2%e7%94%a8%e6%88%b7%e4%b8%8e%e9%85%8d%e7%bd%ae%e7%8e%af%e5%a2%83-linux">#</a></h4> <p>Oracle 通常安装在 <code>oracle</code> 用户下。</p> <div class="highlight"><pre tabindex="0" style="color:#e2e4e5;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span><span style="color:#78787e"># 切换到 oracle 用户</span> </span></span><span style="display:flex;"><span>su - oracle </span></span><span style="display:flex;"><span> </span></span><span style="display:flex;"><span><span style="color:#78787e"># 配置环境变量 (如果未自动加载)</span> </span></span><span style="display:flex;"><span><span style="color:#78787e"># 设置 SID (实例名，例如 ORCL)</span> </span></span><span style="display:flex;"><span><span style="color:#ff5c57">export</span> <span style="color:#ff5c57">ORACLE_SID</span><span style="color:#ff6ac1">=</span>ORCL </span></span><span style="display:flex;"><span><span style="color:#78787e"># 或者设置服务名路径 (通常由 netca 配置好)</span> </span></span><span style="display:flex;"><span><span style="color:#ff5c57">export</span> <span style="color:#ff5c57">ORACLE_HOME</span><span style="color:#ff6ac1">=</span>/u01/app/oracle/product/19.0.0/dbhome_1 </span></span><span style="display:flex;"><span><span style="color:#ff5c57">export</span> <span style="color:#ff5c57">PATH</span><span style="color:#ff6ac1">=</span><span style="color:#ff5c57">$ORACLE_HOME</span>/bin:<span style="color:#ff5c57">$PATH</span></span></span></code></pre></div><h4 id="2-登录数据库">2. 登录数据库<a class="anchor" href="#2-%e7%99%bb%e5%bd%95%e6%95%b0%e6%8d%ae%e5%ba%93">#</a></h4> <div class="highlight"><pre tabindex="0" style="color:#e2e4e5;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span><span style="color:#78787e"># 方式 A: 操作系统认证 (免密，用于本地运维)</span> </span></span><span style="display:flex;"><span>sqlplus / as sysdba </span></span><span style="display:flex;"><span> </span></span><span style="display:flex;"><span><span style="color:#78787e"># 方式 B: 账号密码登录</span> </span></span><span style="display:flex;"><span>sqlplus username/password@localhost:1521/ORCL </span></span><span style="display:flex;"><span> </span></span><span style="display:flex;"><span><span style="color:#78787e"># 方式 C: 静默登录 (用于脚本)</span> </span></span><span style="display:flex;"><span>sqlplus -S username/password@ORCL</span></span></code></pre></div><p><em>注：<code>as sysdba</code> 是最高权限，类似 MySQL 的 root，但权限更大，可启动/关闭实例。</em></p>