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Update MySQL.md

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补充索引失效的常见情况、索引的分类与使用条件，以及 redo log、binlog 和两阶段提交，并配图。
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CyC2018
2026-10-26 02:34:34 +08:00
parent 1443a302f9
commit e2c554d7de
3 changed files with 170 additions and 1 deletions
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tools/diagram/src/mysql-2pc.svg
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<style>
text { font-family: "PingFang SC", "Microsoft YaHei", Helvetica, Arial, sans-serif; fill: #666; font-size: 12px; }
.title { font-weight: bold; font-size: 15px; fill: #777; text-anchor: middle; }
.b { font-weight: bold; }
.c { text-anchor: middle; }
.e { text-anchor: end; }
.note { fill: #C0605A; }
.ok { fill: #6A9F68; }
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<rect width="100%" height="100%" fill="#FFFFFF"/>
<text x="360" y="28" class="title">两阶段提交与崩溃恢复</text>
<rect x="10" y="64" width="124" height="60" rx="6" class="shadow"/>
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<text x="70" y="90" class="b c">开始事务</text>
<text x="70" y="105" class="sub c">修改内存中的页</text>
<rect x="160" y="64" width="124" height="60" rx="6" class="shadow"/>
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<text x="220" y="90" class="b c">① prepare</text>
<text x="220" y="105" class="sub c">写 redo log 并刷盘</text>
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<rect x="338" y="62" width="124" height="60" rx="6" fill="#B0E3E6"/>
<text x="400" y="90" class="b c">② 写 binlog</text>
<text x="400" y="105" class="sub c">含 Xid，刷盘</text>
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<rect x="518" y="62" width="124" height="60" rx="6" fill="#DDD7F6"/>
<text x="580" y="90" class="b c">③ commit</text>
<text x="580" y="105" class="sub c">redo log 标记提交</text>
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<text x="310" y="190" class="c note">崩溃 A</text>
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<text x="490" y="190" class="c note">崩溃 B</text>
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<text x="310" y="232" class="c sub">redo log 处于 prepare，binlog 中没有 Xid</text>
<text x="310" y="252" class="c ok">重启后回滚，主从都没有这次修改</text>
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<text x="565" y="232" class="c sub">redo log 处于 prepare，binlog 中有 Xid</text>
<text x="565" y="252" class="c ok">重启后提交，从库也会通过 binlog 收到修改</text>
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