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Update MySQL.md

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调整配图的配色和画法：换成更浅的蓝、青、紫和暖灰，去掉阴影，方框加同色细描边，箭头改为实心。
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CyC2018
2026-10-26 06:01:52 +08:00
parent b0faeb5837
commit 7e20f4784d
4 changed files with 23 additions and 27 deletions
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notes/pics/deep-pagination.png
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tools/diagram/src/deep-pagination.svg
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<text x="360" y="28" class="title">深分页为什么慢</text>
<text x="20" y="62" class="b">LIMIT 1000000, 10：从头数过 1000000 条，丢弃后再取 10 条</text>
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<text x="630" y="93" class="sub">返回 10 条</text>
<text x="20" y="160" class="b">游标分页：从上一页最后一条之后开始，直接定位</text>
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<text x="310" y="178" class="c sub">沿 B+ 树从根节点向下查找，只读几个节点</text>
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<text x="630" y="233" class="sub">返回 10 条</text>
<text x="20" y="284" class="sub">200 万行的表上实测：LIMIT 1000000, 10 耗时 1321 ms，游标分页 0.13 ms，并且与翻到第几页无关。</text>
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tools/diagram/src/mysql-2pc.svg
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<text x="360" y="28" class="title">两阶段提交与崩溃恢复</text>
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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>
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<text x="220" y="90" class="b c">① prepare</text>
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