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8px;width:100%;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-align-items:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;cursor:pointer;-webkit-tap-highlight-color:transparent;}.css-khel7y:hover{background-color:rgba(0, 0, 0, 0.04);}@media (hover: none){.css-khel7y:hover{background-color:transparent;}}.css-khel7y.Mui-disabled{opacity:0.38;background-color:transparent;}.css-khel7y.Mui-focused{background-color:rgba(0, 0, 0, 0.12);}.css-khel7y.Mui-selected{background-color:rgba(25, 118, 210, 0.08);}.css-khel7y.Mui-selected:hover{background-color:rgba(25, 118, 210, 0.12);}@media (hover: none){.css-khel7y.Mui-selected:hover{background-color:rgba(25, 118, 210, 0.08);}}.css-khel7y.Mui-selected.Mui-focused{background-color:rgba(25, 118, 210, 0.2);}.css-khel7y .MuiTreeItem-iconContainer{margin-right:4px;width:15px;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0;-webkit-box-pack:center;-ms-flex-pack:center;-webkit-justify-content:center;justify-content:center;}.css-khel7y .MuiTreeItem-iconContainer svg{font-size:18px;}.css-khel7y .MuiTreeItem-label{width:100%;min-width:0;padding-left:4px;position:relative;font-size:1rem;line-height:1.5rem;font-family:"Helvetica Neue","sans-serif";font-weight:400;font-style:normal;color:#666666;}</style><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><style data-emotion="css znl8a3">.css-znl8a3{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-flex-direction:row;-ms-flex-direction:row;flex-direction:row;min-height:1.75rem;-webkit-align-items:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;padding-left:0rem;padding-top:0.25rem;padding-bottom:0.25rem;}</style><div class="css-znl8a3"><style data-emotion="css tx8jsd">.css-tx8jsd{margin:0;font-size:1rem;line-height:1.5rem;font-family:"Helvetica Neue","sans-serif";font-weight:400;font-style:normal;color:#666666;}</style><a class="MuiTypography-root MuiTypography-body1 css-tx8jsd" target="_blank" href="https://docs.pingcap.com/zh" style="text-decoration:none;width:100%;color:inherit"><style data-emotion="css 8atqhb">.css-8atqhb{width:100%;}</style><div class="MuiBox-root css-8atqhb"><style data-emotion="css 1hwyipb">.css-1hwyipb{margin:0;font-size:1rem;line-height:1.5rem;font-family:"Helvetica Neue","sans-serif";font-weight:400;font-style:normal;color:#666666;color:inherit;font-size:0.875rem;line-height:1.25rem;}</style><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">文档中心</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-1" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">关于 TiDB</div></div><style data-emotion="css xjq79n">.css-xjq79n{-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;width:1em;height:1em;display:inline-block;fill:currentColor;-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0;-webkit-transition:fill 200ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:fill 200ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;font-size:1.5rem;fill:#999999;height:1rem;width:1rem;margin-left:auto;-webkit-transform:none;-moz-transform:none;-ms-transform:none;transform:none;}</style><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div><style data-emotion="css 1jozaee">.css-1jozaee{margin:0;padding:0;margin-left:17px;}</style></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-2" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">快速上手</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-3" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">应用开发</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-4" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">部署标准集群</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-5" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">数据迁移</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-6" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">数据集成</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-7" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">运维操作</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-8" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">监控与告警</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-9" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">故障诊断</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-10" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">性能调优</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-11" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">教程</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-12" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">TiDB 工具</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="true" id="left-nav-treeview-0-13" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content Mui-expanded" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">参考指南</div></div><style data-emotion="css 171pefp">.css-171pefp{-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;width:1em;height:1em;display:inline-block;fill:currentColor;-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0;-webkit-transition:fill 200ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:fill 200ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;font-size:1.5rem;fill:#999999;height:1rem;width:1rem;margin-left:auto;-webkit-transform:rotate(90deg);-moz-transform:rotate(90deg);-ms-transform:rotate(90deg);transform:rotate(90deg);}</style><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-171pefp" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div><style data-emotion="css 1xxsnna">.css-1xxsnna{height:auto;overflow:visible;-webkit-transition:height 300ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:height 300ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;margin:0;padding:0;margin-left:17px;}</style><ul class="MuiCollapse-root MuiCollapse-vertical MuiTreeItem-group MuiCollapse-entered css-1xxsnna" style="min-height:0px" role="group"><div class="MuiCollapse-wrapper MuiCollapse-vertical css-hboir5"><div class="MuiCollapse-wrapperInner MuiCollapse-vertical css-8atqhb"><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-13-0" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><style data-emotion="css kb2j4b">.css-kb2j4b{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-flex-direction:row;-ms-flex-direction:row;flex-direction:row;min-height:1.75rem;-webkit-align-items:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;padding-left:0.5rem;padding-top:0.25rem;padding-bottom:0.25rem;}</style><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">架构</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-13-1" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">存储引擎 TiKV</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-13-2" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">存储引擎 TiFlash</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" id="left-nav-treeview-0-13-3" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><a style="text-decoration:none;width:100%;color:inherit" href="/zh/tidb/stable/system-variables"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">系统变量</div></div></a></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-13-4" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">配置文件参数</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-13-5" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">CLI</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-13-6" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">命令行参数</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-13-7" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">监控指标</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-13-8" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">安全加固</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-13-9" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-kb2j4b"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">权限</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium 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viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li></div></div></ul></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-14" tabindex="-1" style="margin-top:0.1875rem;margin-bottom:0.1875rem"><div class="css-khel7y MuiTreeItem-content" style="width:inherit"><div class="MuiTreeItem-iconContainer"/><div class="MuiTreeItem-label"><div class="css-znl8a3"><div class="MuiBox-root css-8atqhb"><div class="MuiTypography-root MuiTypography-body1 css-1hwyipb">常见问题解答 (FAQ)</div></div><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeMedium MuiTreeItem-ChevronRightIcon css-xjq79n" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="ChevronRightIcon"><path d="M10 6 8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"/></svg></div></div></div></li><li class="MuiTreeItem-root css-1oy5rnm" role="treeitem" aria-expanded="false" id="left-nav-treeview-0-15" 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(min-width:600px){.css-90fn5w{-webkit-flex-direction:row;-ms-flex-direction:row;flex-direction:row;}}</style><div class="css-90fn5w"><style data-emotion="css vofosd">.css-vofosd{padding:1.5rem 0;}@media (min-width:0px){.css-vofosd{width:100%;}}@media (min-width:600px){.css-vofosd{width:calc(100% - 17.5rem);}}</style><div class="MuiBox-root css-vofosd"><style data-emotion="css 1ekb41w">.css-1ekb41w{width:100%;margin-left:auto;box-sizing:border-box;margin-right:auto;display:block;padding-left:16px;padding-right:16px;}@media (min-width:600px){.css-1ekb41w{padding-left:24px;padding-right:24px;}}@media (min-width:1536px){.css-1ekb41w{max-width:1536px;}}</style><div class="MuiContainer-root MuiContainer-maxWidthXl doc-content css-1ekb41w"><div class="markdown-body MuiBox-root css-0"><h1 id="错误码与故障诊断" style="position:relative"><a href="#%E9%94%99%E8%AF%AF%E7%A0%81%E4%B8%8E%E6%95%85%E9%9A%9C%E8%AF%8A%E6%96%AD" aria-label="错误码与故障诊断 permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a>错误码与故障诊断</h1><p>本篇文档描述在使用 TiDB 过程中会遇到的问题以及解决方法。</p><h2 id="错误码" style="position:relative"><a href="#%E9%94%99%E8%AF%AF%E7%A0%81" aria-label="错误码 permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a>错误码</h2><p>TiDB 兼容 MySQL 的错误码，在大多数情况下，返回和 MySQL 一样的错误码。关于 MySQL 的错误码列表，详见 <a href="https://dev.mysql.com/doc/mysql-errors/5.7/en/" target="_blank" referrerpolicy="no-referrer-when-downgrade">MySQL 5.7 Error Message Reference</a>。另外还有一些 TiDB 特有的错误码：</p><style data-emotion="css 1weqspv">.css-1weqspv{padding-top:0.5rem;padding-bottom:0.5rem;}.css-1weqspv .MuiAlert-message p{margin-bottom:0px;margin-top:0px;}</style><div class="MuiBox-root css-1weqspv"><style data-emotion="css 17zlexa">.css-17zlexa{font-size:0.875rem;line-height:1.25rem;font-family:"Helvetica Neue","sans-serif";font-weight:400;font-style:normal;color:rgb(1, 67, 97);background-color:rgb(229, 246, 253);display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;padding:6px 16px;}.css-17zlexa .MuiAlert-icon{color:#03a9f4;}</style><style data-emotion="css 152gid5">.css-152gid5{background-color:#fff;color:rgba(0, 0, 0, 0.87);-webkit-transition:box-shadow 300ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:box-shadow 300ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;border-radius:4px;box-shadow:none;font-size:0.875rem;line-height:1.25rem;font-family:"Helvetica Neue","sans-serif";font-weight:400;font-style:normal;color:rgb(1, 67, 97);background-color:rgb(229, 246, 253);display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;padding:6px 16px;}.css-152gid5 .MuiAlert-icon{color:#03a9f4;}</style><div class="MuiPaper-root MuiPaper-elevation MuiPaper-rounded MuiPaper-elevation0 MuiAlert-root MuiAlert-standardInfo MuiAlert-standard css-152gid5" role="alert"><style data-emotion="css 1l54tgj">.css-1l54tgj{margin-right:12px;padding:7px 0;display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;font-size:22px;opacity:0.9;}</style><div class="MuiAlert-icon css-1l54tgj"><style data-emotion="css 1cw4hi4">.css-1cw4hi4{-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;width:1em;height:1em;display:inline-block;fill:currentColor;-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0;-webkit-transition:fill 200ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;transition:fill 200ms cubic-bezier(0.4, 0, 0.2, 1) 0ms;font-size:inherit;}</style><svg class="MuiSvgIcon-root MuiSvgIcon-fontSizeInherit css-1cw4hi4" focusable="false" aria-hidden="true" viewbox="0 0 24 24" data-testid="InfoOutlinedIcon"><path d="M11,9H13V7H11M12,20C7.59,20 4,16.41 4,12C4,7.59 7.59,4 12,4C16.41,4 20,7.59 20, 12C20,16.41 16.41,20 12,20M12,2A10,10 0 0,0 2,12A10,10 0 0,0 12,22A10,10 0 0,0 22,12A10, 10 0 0,0 12,2M11,17H13V11H11V17Z"/></svg></div><style data-emotion="css 1xsto0d">.css-1xsto0d{padding:8px 0;min-width:0;overflow:auto;}</style><div class="MuiAlert-message css-1xsto0d"><style data-emotion="css 1h2y6o4">.css-1h2y6o4{font-weight:500;margin-top:-2px;}</style><style data-emotion="css 17ioyuk">.css-17ioyuk{margin:0;font-size:1rem;line-height:1.5rem;font-family:"Helvetica Neue","sans-serif";font-weight:400;font-style:normal;color:#666666;margin-bottom:0.35em;font-weight:500;margin-top:-2px;}</style><div class="MuiTypography-root MuiTypography-body1 MuiTypography-gutterBottom MuiAlertTitle-root css-17ioyuk">注意</div><p>有一部分错误码属于内部错误，正常情况下 TiDB 会自行处理不会直接返回给用户，故没有在此列出。</p><p>如果你遇到了这里没有列出的错误码，请从 PingCAP 官方或 TiDB 社区<a href="/zh/tidb/stable/support">获取支持</a>。</p></div></div></div><ul><li><p>Error Number: 8001</p><p> 请求使用的内存超过 TiDB 内存使用的阈值限制。出现这种错误，可以通过调整系统变量 <a href="/zh/tidb/stable/system-variables#tidb_mem_quota_query"><code>tidb_mem_quota_query</code></a> 来增大单个 SQL 使用的内存上限。</p></li><li><p>Error Number: 8002</p><p> 带有 <code>SELECT FOR UPDATE</code> 语句的事务，在遇到写入冲突时，为保证一致性无法进行重试，事务将进行回滚并返回该错误。出现这种错误，应用程序可以安全地重新执行整个事务。</p></li><li><p>Error Number: 8003</p><p> <a href="/zh/tidb/stable/sql-statement-admin-check-table-index"><code>ADMIN CHECK TABLE</code></a> 命令在遇到行数据跟索引不一致的时候返回该错误，在检查表中数据是否有损坏时常出现。出现该错误时，请向 PingCAP 工程师或通过官方论坛寻求帮助。</p></li><li><p>Error Number: 8004</p><p> 单个事务过大，原因及解决方法请参考<a href="/zh/tidb/stable/migration-tidb-faq#transaction-too-large-是什么原因怎么解决">这里</a></p></li><li><p>Error Number: 8005</p><p> 完整的报错信息为 <code>ERROR 8005 (HY000) : Write Conflict, txnStartTS is stale</code>。</p><p> 事务在 TiDB 中遇到了写入冲突。请检查业务逻辑，重试写入操作。</p></li><li><p>Error Number: 8018</p><p> 当执行重新载入插件时，如果之前插件没有载入过，则会出现该错误。出现该错误，进行插件首次载入即可。</p></li><li><p>Error Number: 8019</p><p> 重新载入的插件版本与之前的插件版本不一致，无法重新载入插件并报告该错误。可重新载入插件，确保插件的版本与之前载入的插件版本一致。</p></li><li><p>Error Number: 8020</p><p> 当表被加锁时，如果对该表执行写入操作，将出现该错误。请将表解锁后，再进行尝试写入。</p></li><li><p>Error Number: 8021</p><p> 当向 TiKV 读取的 key 不存在时将出现该错误，该错误用于内部使用，对外表现为读到的结果为空。</p></li><li><p>Error Number: 8022</p><p> 事务提交失败，已经回滚，应用程序可以安全的重新执行整个事务。</p></li><li><p>Error Number: 8023</p><p> 在事务内，写入事务缓存时，设置了空值，将返回该错误。这是一个内部使用的错误，将由内部进行处理，不会返回给应用程序。</p></li><li><p>Error Number: 8024</p><p> 非法的事务。当事务执行时，发现没有获取事务的 ID (Start Timestamp)，代表正在执行的事务是一个非法的事务，将返回该错误。通常情况下不会出现该问题，当发生时，请向 PingCAP 工程师或通过官方论坛寻求帮助。</p></li><li><p>Error Number: 8025</p><p> 写入的单条键值对过大。TiDB 默认支持最大 6MB 的单个键值对，超过该限制可适当调整 <a href="/zh/tidb/stable/tidb-configuration-file#txn-entry-size-limit-从-v50-版本开始引入"><code>txn-entry-size-limit</code></a> 配置项以放宽限制。</p></li><li><p>Error Number: 8026</p><p> 使用了没有实现的接口函数。该错误仅用于数据库内部，应用程序不会收到这个错误。</p></li><li><p>Error Number: 8027</p><p> 表结构版本过期。TiDB 采用在线变更表结构的方法。当 TiDB server 表结构版本落后于整个系统的时，执行 SQL 将遇到该错误。遇到该错误，请检查该 TiDB server 与 PD leader 之间的网络。</p></li><li><p>Error Number: 8028</p><p> TiDB v6.3.0 引入了<a href="/zh/tidb/stable/metadata-lock">元数据锁</a>特性。在关闭元数据锁的情况下，当事务执行时，事务无法感知到 TiDB 的表结构发生了变化。因此，TiDB 在事务提交时，会对事务涉及表的结构进行检查。如果事务执行中表结构发生了变化，则事务将提交失败，并返回该错误。遇到该错误，应用程序可以安全地重新执行整个事务。</p><p> 在打开元数据锁的情况下，非 RC 隔离级别中，如果从事务开始到初次访问一个表之间，该表进行了有损的列类型变更操作（例如 <code>INT</code> 类型变成 <code>CHAR</code> 类型是有损的，<code>TINYINT</code> 类型变成 <code>INT</code> 类型这种不需要重写数据的则是无损的），则访问该表的语句报错，事务不会自动回滚。用户可以继续执行其他语句，并决定是否回滚或者提交事务。</p></li><li><p>Error Number: 8029</p><p> 当数据库内部进行数值转换发生错误时，将会出现该错误，该错误仅在内部使用，对外部应用将转换为具体类型的错误。</p></li><li><p>Error Number: 8030</p><p> 将值转变为带符号正整数时发生了越界，将结果显示为负数。多在告警信息里出现。</p></li><li><p>Error Number: 8031</p><p> 将负数转变为无符号数时，将负数转变为了正数。多在告警信息里出现。</p></li><li><p>Error Number: 8032</p><p> 使用了非法的 year 格式。year 只允许 1 位、2 位和 4 位数。</p></li><li><p>Error Number: 8033</p><p> 使用了非法的 year 值。year 的合法范围是 (1901, 2155)。</p></li><li><p>Error Number: 8037</p><p> week 函数中使用了非法的 mode 格式。mode 必须是一位数字，范围 [0, 7]。</p></li><li><p>Error Number: 8038</p><p> 字段无法获取到默认值。一般作为内部错误使用，转换成其他具体错误类型后，返回给应用程序。</p></li><li><p>Error Number: 8040</p><p> 尝试进行不支持的操作，比如在 View 和 Sequence 上进行 lock table。</p></li><li><p>Error Number: 8047</p><p> 设置了不支持的系统变量值，通常在用户设置了数据库不支持的变量值后的告警信息里出现。</p></li><li><p>Error Number: 8048</p><p> 设置了不支持的隔离级别，如果是使用第三方工具或框架等无法修改代码进行适配的情况，可以考虑通过 <a href="/zh/tidb/stable/system-variables#tidb_skip_isolation_level_check"><code>tidb_skip_isolation_level_check</code></a> 来绕过这一检查。</p><pre><code class="language-sql">set @@tidb_skip_isolation_level_check = 1; </code></pre></li><li><p>Error Number: 8050</p><p> 设置了不支持的权限类型，遇到该错误请参考 <a href="/zh/tidb/stable/privilege-management#tidb-各操作需要的权限">TiDB 权限说明</a>进行调整。</p></li><li><p>Error Number: 8051</p><p> TiDB 在解析客户端发送的 Exec 参数列表时遇到了未知的数据类型。如果遇到这个错误，请检查客户端是否正常，如果客户端正常请向 PingCAP 工程师或通过官方论坛寻求帮助。</p></li><li><p>Error Number: 8052</p><p> 来自客户端的数据包的序列号错误。如果遇到这个错误，请检查客户端是否正常，如果客户端正常请向 PingCAP 工程师或通过官方论坛寻求帮助。</p></li><li><p>Error Number: 8055</p><p> 当前快照过旧，数据可能已经被 GC。可以调大 <a href="/zh/tidb/stable/system-variables#tidb_gc_life_time-从-v50-版本开始引入"><code>tidb_gc_life_time</code></a> 的值来避免该问题。从 TiDB v4.0.8 版本起，TiDB 会自动为长时间运行的事务保留数据，一般不会遇到该错误。</p><p> 有关 GC 的介绍和配置可以参考 <a href="/zh/tidb/stable/garbage-collection-overview">GC 机制简介</a>和 <a href="/zh/tidb/stable/garbage-collection-configuration">GC 配置</a>文档。</p></li><li><p>Error Number: 8059</p><p> 自动随机量可用次数用尽无法进行分配。当前没有恢复这类错误的方法。建议在使用 auto random 功能时使用 bigint 以获取最大的可分配次数，并尽量避免手动给 auto random 列赋值。相关的介绍和使用建议可以参考 <a href="/zh/tidb/stable/auto-random">auto random 功能文档</a>。</p></li><li><p>Error Number: 8060</p><p> 非法的自增列偏移量。请检查 <code>auto_increment_increment</code> 和 <code>auto_increment_offset</code> 的取值是否符合要求。</p></li><li><p>Error Number: 8061</p><p> 不支持的 SQL Hint。请参考 <a href="/zh/tidb/stable/optimizer-hints">Optimizer Hints</a> 检查和修正 SQL Hint。</p></li><li><p>Error Number: 8062</p><p> SQL Hint 中使用了非法的 token，与 Hint 的保留字冲突。请参考 <a href="/zh/tidb/stable/optimizer-hints">Optimizer Hints</a> 检查和修正 SQL Hint。</p></li><li><p>Error Number: 8063</p><p> SQL Hint 中限制内存使用量超过系统设置的上限，设置被忽略。请参考 <a href="/zh/tidb/stable/optimizer-hints">Optimizer Hints</a> 检查和修正 SQL Hint。</p></li><li><p>Error Number: 8064</p><p> 解析 SQL Hint 失败。请参考 <a href="/zh/tidb/stable/optimizer-hints">Optimizer Hints</a> 检查和修正 SQL Hint。</p></li><li><p>Error Number: 8065</p><p> SQL Hint 中使用了非法的整数。请参考 <a href="/zh/tidb/stable/optimizer-hints">Optimizer Hints</a> 检查和修正 SQL Hint。</p></li><li><p>Error Number: 8066</p><p> JSON_OBJECTAGG 函数的第二个参数是非法参数。</p></li><li><p>Error Number: 8101</p><p> 插件 ID 格式错误，正确的格式是 <code>[name]-[version]</code> 并且 name 和 version 中不能带有 '-'。</p></li><li><p>Error Number: 8102</p><p> 无法读取插件定义信息。请检查插件相关的配置。</p></li><li><p>Error Number: 8103</p><p> 插件名称错误，请检查插件的配置。</p></li><li><p>Error Number: 8104</p><p> 插件版本不匹配，请检查插件的配置。</p></li><li><p>Error Number: 8105</p><p> 插件被重复载入。</p></li><li><p>Error Number: 8106</p><p> 插件定义的系统变量名称没有以插件名作为开头，请联系插件的开发者进行修复。</p></li><li><p>Error Number: 8107</p><p> 载入的插件未指定版本或指定的版本过低，请检查插件的配置。</p></li><li><p>Error Number: 8108</p><p> 不支持的执行计划类型。该错误为内部处理的错误，如果遇到该报错请向 PingCAP 工程师或通过官方论坛寻求帮助。</p></li><li><p>Error Number: 8109</p><p> analyze 索引时找不到指定的索引。</p></li><li><p>Error Number: 8110</p><p> 不能进行笛卡尔积运算，需要将配置文件里的 <code>cross-join</code> 设置为 <code>true</code>。</p></li><li><p>Error Number: 8111</p><p> execute 语句执行时找不到对应的 prepare 语句。</p></li><li><p>Error Number: 8112</p><p> execute 语句的参数个数与 prepare 语句不符合。</p></li><li><p>Error Number: 8113</p><p> execute 语句涉及的表结构在 prepare 语句执行后发生了变化。</p></li><li><p>Error Number: 8115</p><p> 不支持 prepare 多行语句。</p></li><li><p>Error Number: 8116</p><p> 不支持 prepare DDL 语句。</p></li><li><p>Error Number: 8120</p><p> 获取不到事务的 start tso，请检查 PD Server 状态/监控/日志以及 TiDB Server 与 PD Server 之间的网络。</p></li><li><p>Error Number: 8121</p><p> 权限检查失败，请检查数据库的权限配置。</p></li><li><p>Error Number: 8122</p><p> 指定了通配符，但是找不到对应的表名。</p></li><li><p>Error Number: 8123</p><p> 带聚合函数的 SQL 中返回非聚合的列，违反了 <code>only_full_group_by</code> 模式。请修改 SQL 或者考虑关闭 <code>only_full_group_by</code> 模式。</p></li><li><p>Error Number: 8129</p><p> TiDB 尚不支持键长度 &gt;= 65536 的 JSON 对象。</p></li><li><p>Error Number: 8130</p><p> 完整的报错信息为 <code>ERROR 8130 (HY000): client has multi-statement capability disabled</code>。</p><p> 从早期版本的 TiDB 升级后，可能会出现该问题。为了减少 SQL 注入攻击的影响，TiDB 目前默认不允许在同一 <code>COM_QUERY</code> 调用中执行多个查询。</p><p> 可通过系统变量 <a href="/zh/tidb/stable/system-variables#tidb_multi_statement_mode-从-v4011-版本开始引入"><code>tidb_multi_statement_mode</code></a> 控制是否在同一 <code>COM_QUERY</code> 调用中执行多个查询。</p></li><li><p>Error Number: 8138</p><p> 事务试图写入的行值有误，请参考<a href="/zh/tidb/stable/troubleshoot-data-inconsistency-errors#error-8138">数据索引不一致报错</a>。</p></li><li><p>Error Number: 8139</p><p> 事务试图写入的行和索引的 handle 值不一致，请参考<a href="/zh/tidb/stable/troubleshoot-data-inconsistency-errors#error-8139">数据索引不一致报错</a>。</p></li><li><p>Error Number: 8140</p><p> 事务试图写入的行和索引的值不一致，请参考<a href="/zh/tidb/stable/troubleshoot-data-inconsistency-errors#error-8140">数据索引不一致报错</a>。</p></li><li><p>Error Number: 8141</p><p> 事务写入时，对 key 的存在性断言报错，请参考<a href="/zh/tidb/stable/troubleshoot-data-inconsistency-errors#error-8141">数据索引不一致报错</a>。</p></li><li><p>Error Number: 8143</p><p> 非事务 DML 语句的一个 batch 报错，语句中止，请参考<a href="/zh/tidb/stable/non-transactional-dml">非事务 DML 语句</a></p></li><li><p>Error Number: 8147</p><p> 当 <a href="/zh/tidb/stable/system-variables#tidb_constraint_check_in_place_pessimistic-从-v630-版本开始引入"><code>tidb_constraint_check_in_place_pessimistic</code></a> 设置为 <code>OFF</code> 时，为保证事务的正确性，SQL 语句执行时产生的任何错误都可能导致 TiDB 返回 <code>8147</code> 报错并中止当前事务。具体的错误原因，请参考对应的报错信息。详见<a href="/zh/tidb/stable/constraints#悲观事务">约束</a>。</p></li><li><p>Error Number: 8154</p><p> 目前 <code>LOAD DATA</code> 不支持从 TiDB 服务器本地导入数据，可以指定 <code>LOCAL</code> 从客户端导入，或者将数据上传到 S3/GCS 再进行导入。请参考 <a href="/zh/tidb/stable/sql-statement-load-data"><code>LOAD DATA</code></a>。</p></li><li><p>Error Number: 8156</p><p> <code>LOAD DATA</code> 语句的文件路径不能为空。需要设置正确的路径再进行导入。请参考 <a href="/zh/tidb/stable/sql-statement-load-data"><code>LOAD DATA</code></a>。</p></li><li><p>Error Number: 8158</p><p> 传入的 S3/GCS 路径无效。请参考<a href="/zh/tidb/stable/backup-and-restore-storages">外部存储</a>设置有效的路径。</p></li><li><p>Error Number: 8159</p><p> TiDB 无法访问 <code>LOAD DATA</code> 语句中传入的 S3/GCS 路径。请确保填入的 S3/GCS bucket 存在，且你输入了正确的 access key 和 secret access key 以让 TiDB 服务器有权限访问 S3/GCS 对应的 bucket。</p></li><li><p>Error Number: 8160</p><p> <code>LOAD DATA</code> 读取数据文件失败。请根据具体的错误提示进行处理。</p></li><li><p>Error Number: 8162</p><p> <code>LOAD DATA</code> 语句存在错误。请参考 <a href="/zh/tidb/stable/sql-statement-load-data"><code>LOAD DATA</code></a> 查看已支持的功能。</p></li><li><p>Error Number: 8200</p><p> 尚不支持的 DDL 语法。请参考<a href="/zh/tidb/stable/mysql-compatibility#ddl-的限制">与 MySQL DDL 的兼容性</a>。</p></li><li><p>Error Number: 8214</p><p> DDL 操作被 admin cancel 操作终止。</p></li><li><p>Error Number: 8215</p><p> Admin Repair 表失败，如果遇到该报错请向 PingCAP 工程师或通过官方论坛寻求帮助。</p></li><li><p>Error Number: 8216</p><p> 自动随机列使用的方法不正确，请参考 <a href="/zh/tidb/stable/auto-random">auto random 功能文档</a>进行修改。</p></li><li><p>Error Number: 8223</p><p> 检测出数据与索引不一致的错误，如果遇到该报错请向 PingCAP 工程师或通过官方论坛寻求帮助。</p></li><li><p>Error Number: 8224</p><p> 找不到 DDL job，请检查 restore 操作指定的 job id 是否存在。</p></li><li><p>Error Number: 8225</p><p> DDL 已经完成，无法被取消。</p></li><li><p>Error Number: 8226</p><p> DDL 几乎要完成了，无法被取消。</p></li><li><p>Error Number: 8227</p><p> 创建 Sequence 时使用了不支持的选项，支持的选项的列表可以参考 <a href="/zh/tidb/stable/sql-statement-create-sequence#参数说明">Sequence 使用文档</a>。</p></li><li><p>Error Number: 8228</p><p> 在 Sequence 上使用 <code>setval</code> 时指定了不支持的类型，该函数的示例可以在 <a href="/zh/tidb/stable/sql-statement-create-sequence#示例">Sequence 使用文档</a>中找到。</p></li><li><p>Error Number: 8229</p><p> 事务超过存活时间，遇到该问题可以提交或者回滚当前事务，开启一个新事务。</p></li><li><p>Error Number: 8230</p><p> TiDB 目前不支持在新添加的列上使用 Sequence 作为默认值，如果尝试进行这类操作会返回该错误。</p></li><li><p>Error Number: 8248</p><p> 资源组已存在。在重复创建资源组时返回该错误。</p></li><li><p>Error Number: 8249</p><p> 资源组不存在。在修改或绑定不存在的资源组时返回该错误。请参考<a href="/zh/tidb/stable/tidb-resource-control#创建资源组">创建资源组</a>。</p></li><li><p>Error Number: 8250</p><p> 完整的报错信息如下：</p><p> <code>ERROR 8250 (HY000) : Resource control feature is disabled. Run "SET GLOBAL tidb_enable_resource_control='on'" to enable the feature</code></p><p> 资源控制的功能没有打开时，使用资源管控 (Resource Control) 相关功能会返回该错误。你可以开启全局变量 <a href="/zh/tidb/stable/system-variables#tidb_enable_resource_control-从-v660-版本开始引入"><code>tidb_enable_resource_control</code></a> 启用资源管控。</p></li><li><p>Error Number: 8251</p><p> <code>Resource Control</code> 组件在 TiDB 启动时进行初始化，相关配置会从 <code>Resource Control</code> 的服务端 <code>Resource Manager</code> 上获取，如果此过程中出错，则会返回此错误。</p></li><li><p>Error Number: 8252</p><p> 完整的报错信息如下：</p><p> <code>ERROR 8252 (HY000) : Exceeded resource group quota limitation</code></p><p> 在尝试消耗超过资源组的限制时返回该错误。一般出现该错误，是由于单次事务太大或者并发太多导致，需调整事务大小或减少客户端并发数。</p></li><li><p>Error Number: 9001</p><p> 完整的报错信息为 <code>ERROR 9001 (HY000) : PD Server Timeout</code>。</p><p> 请求 PD 超时，请检查 PD Server 状态/监控/日志以及 TiDB Server 与 PD Server 之间的网络。</p></li><li><p>Error Number: 9002</p><p> 完整的报错信息为 <code>ERROR 9002 (HY000) : TiKV Server Timeout</code>。</p><p> 请求 TiKV 超时，请检查 TiKV Server 状态/监控/日志以及 TiDB Server 与 TiKV Server 之间的网络。</p></li><li><p>Error Number: 9003</p><p> 完整的报错信息为 <code>ERROR 9003 (HY000) : TiKV Server is Busy</code>。</p><p> TiKV 操作繁忙，一般出现在数据库负载比较高时，请检查 TiKV Server 状态/监控/日志。</p></li><li><p>Error Number: 9004</p><p> 完整的报错信息为 <code>ERROR 9004 (HY000) : Resolve Lock Timeout</code>。</p><p> 清理锁超时，当数据库上承载的业务存在大量的事务冲突时，会遇到这种错误，请检查业务代码是否有锁争用。</p></li><li><p>Error Number: 9005</p><p> 完整的报错信息为 <code>ERROR 9005 (HY000) : Region is unavailable</code>。</p><p> 访问的 Region 不可用，某个 Raft Group 不可用，如副本数目不足，出现在 TiKV 比较繁忙或者是 TiKV 节点停机的时候，请检查 TiKV Server 状态/监控/日志。</p></li><li><p>Error Number: 9006</p><p> 完整的报错信息为 <code>ERROR 9006 (HY000) : GC life time is shorter than transaction duration</code>。</p><p> GC Life Time 间隔时间过短，长事务本应读到的数据可能被清理了。你可以使用如下命令修改 <a href="/zh/tidb/stable/system-variables#tidb_gc_life_time-从-v50-版本开始引入"><code>tidb_gc_life_time</code></a> 的值：</p><pre><code class="language-sql">SET GLOBAL tidb_gc_life_time = '30m'; </code></pre><p> 其中 30m 代表仅清理 30 分钟前的数据，这可能会额外占用一定的存储空间。</p></li><li><p>Error Number: 9007</p><p> 报错信息以 <code>ERROR 9007 (HY000) : Write conflict</code> 开头。</p><p> 如果报错信息中含有 "reason=LazyUniquenessCheck"，说明是悲观事务并且设置了 <code>@@tidb_constraint_check_in_place_pessimistic=OFF</code>，业务中存在唯一索引上的写冲突，此时悲观事务不能保证执行成功。可以在应用测重试事务，或将该变量设置成 <code>ON</code> 绕过。详见<a href="/zh/tidb/stable/constraints#悲观事务">约束</a>。</p></li><li><p>Error Number: 9008</p><p> 同时向 TiKV 发送的请求过多，超过了限制。请调大 <code>tidb_store_limit</code> 或将其设置为 <code>0</code> 来取消对请求流量的限制。</p></li><li><p>Error Number: 9010</p><p> TiKV 无法处理这条 raft log，请检查 TiKV Server 状态/监控/日志。</p></li><li><p>Error Number: 9012</p><p> 请求 TiFlash 超时。请检查 TiFlash Server 状态/监控/日志以及 TiDB Server 与 TiFlash Server 之间的网络。</p></li><li><p>Error Number: 9013</p><p> TiFlash 操作繁忙。该错误一般出现在数据库负载比较高时。请检查 TiFlash Server 的状态/监控/日志。</p></li></ul><h3 id="mysql-原生报错汇总" style="position:relative"><a href="#mysql-%E5%8E%9F%E7%94%9F%E6%8A%A5%E9%94%99%E6%B1%87%E6%80%BB" aria-label="mysql 原生报错汇总 permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a>MySQL 原生报错汇总</h3><ul><li><p>Error Number: 2013 (HY000)</p><p> 完整的报错信息为 <code>ERROR 2013 (HY000): Lost connection to MySQL server during query</code>。</p><p> 排查方法如下：</p><ul><li>log 中是否有 panic</li><li>dmesg 中是否有 oom，命令：<code>dmesg -T | grep -i oom</code></li><li>长时间没有访问，也会收到这个报错，一般是 tcp 超时导致的，tcp 长时间不用，会被操作系统 kill。</li></ul></li><li><p>Error Number: 1105 (HY000)</p><p> 完整的报错信息为 <code>ERROR 1105 (HY000): other error: unknown error Wire Error(InvalidEnumValue(4004))</code></p><p> 这类问题一般是 TiDB 和 TiKV 版本不匹配，在升级过程尽量一起升级，避免版本 mismatch。</p></li><li><p>Error Number: 1148 (42000)</p><p> 完整的报错信息为 <code>ERROR 1148 (42000): the used command is not allowed with this TiDB version</code>。</p><p> 这个问题是因为在执行 <code>LOAD DATA LOCAL</code> 语句的时候，MySQL 客户端不允许执行此语句（即 <code>local_infile</code> 选项为 0）。解决方法是在启动 MySQL 客户端时，用 <code>--local-infile=1</code> 选项。具体启动指令类似：<code>mysql --local-infile=1 -u root -h 127.0.0.1 -P 4000</code>。有些 MySQL 客户端需要设置而有些不需要设置，原因是不同版本的 MySQL 客户端对 <code>local-infile</code> 的默认值不同。</p></li><li><p>Error Number: 9001 (HY000)</p><p> 完整的报错信息为 <code>ERROR 9001 (HY000): PD server timeout start timestamp may fall behind safe point</code></p><p> 这个报错一般是 TiDB 访问 PD 出了问题，TiDB 后台有个 worker 会不断地从 PD 查询 safepoint，如果超过 100s 查不成功就会报这个错。一般是因为 PD 磁盘操作过忙、反应过慢，或者 TiDB 和 PD 之间的网络有问题。TiDB 常见错误码请参考<a aria-current="page" class="" href="/zh/tidb/stable/error-codes">错误码与故障诊断</a>。</p></li><li><p>TiDB 日志中的报错信息：EOF</p><p> 当客户端或者 proxy 断开连接时，TiDB 不会立刻察觉连接已断开，而是等到开始往连接返回数据时，才发现连接已断开，此时日志会打印 EOF 错误。</p></li></ul><h2 id="故障诊断" style="position:relative"><a href="#%E6%95%85%E9%9A%9C%E8%AF%8A%E6%96%AD" aria-label="故障诊断 permalink" class="anchor before"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg></a>故障诊断</h2><p>参见<a href="/zh/tidb/stable/troubleshoot-tidb-cluster">故障诊断文档</a>。</p></div></div></div><style data-emotion="css 11q09s7">.css-11q09s7{width:17.5rem;}@media (min-width:0px){.css-11q09s7{;}}@media (min-width:600px){.css-11q09s7{display:block;}}</style><div class="MuiBox-root css-11q09s7"><style data-emotion="css 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