-
Notifications
You must be signed in to change notification settings - Fork 0
/
mysql2.html
1488 lines (864 loc) · 44.8 KB
/
mysql2.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
<!DOCTYPE html>
<html class="theme-next muse use-motion" lang="zh-Hans">
<head><meta name="generator" content="Hexo 3.8.0">
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<meta name="theme-color" content="#fff">
<script src="//cdn.bootcss.com/pace/1.0.2/pace.min.js"></script>
<link href="//cdn.bootcss.com/pace/1.0.2/themes/blue/pace-theme-flash.min.css" rel="stylesheet">
<meta http-equiv="Cache-Control" content="no-transform">
<meta http-equiv="Cache-Control" content="no-siteapp">
<link href="https://cdnjs.cloudflare.com/ajax/libs/fancybox/3.2.5/jquery.fancybox.min.css" rel="stylesheet" type="text/css">
<link href="https://fonts.loli.net/css?family=Lato:300,300italic,400,400italic,700,700italic|Roboto Slab:300,300italic,400,400italic,700,700italic|Roboto Mono:300,300italic,400,400italic,700,700italic&subset=latin,latin-ext" rel="stylesheet" type="text/css">
<link href="https://cdn.bootcss.com/font-awesome/4.7.0/css/font-awesome.css" rel="stylesheet" type="text/css">
<link href="/css/main.css?v=5.1.3" rel="stylesheet" type="text/css">
<link rel="apple-touch-icon" sizes="180x180" href="/images/apple-touch-icon.png?v=5.1.3">
<link rel="icon" type="image/png" sizes="32x32" href="/images/favicon-32x32.png?v=5.1.3">
<link rel="icon" type="image/png" sizes="16x16" href="/images/favicon-16x16.png?v=5.1.3">
<link rel="mask-icon" href="/images/safari-pinned-tab.svg?v=5.1.3" color="#fff">
<link rel="manifest" href="/images/manifest.json">
<meta name="msapplication-config" content="/images/browserconfig.xml">
<meta name="keywords" content="数据库,">
<meta name="description" content="一条更新语句是如何执行的？复习之前学过的内容，分析器，解析器，优化器，执行器 。更新流程和查询不一样，会涉及到2个重要的日志，一个redo log ，一个是bin log 。 Redo Log redo log 属于innodb 引擎的日志 mysql中的WAL 技术，全称 write-ahead-loging ，关键点，先写内存后写磁盘，更新到内存更新就算完成了，innodb会在系统空闲时">
<meta name="keywords" content="数据库">
<meta property="og:type" content="article">
<meta property="og:title" content="一条更新语句是如何执行的">
<meta property="og:url" content="http://alonecong.github.io/mysql2.html">
<meta property="og:site_name" content="雨正来【一路奔跑的人】">
<meta property="og:description" content="一条更新语句是如何执行的？复习之前学过的内容，分析器，解析器，优化器，执行器 。更新流程和查询不一样，会涉及到2个重要的日志，一个redo log ，一个是bin log 。 Redo Log redo log 属于innodb 引擎的日志 mysql中的WAL 技术，全称 write-ahead-loging ，关键点，先写内存后写磁盘，更新到内存更新就算完成了，innodb会在系统空闲时">
<meta property="og:locale" content="zh-Hans">
<meta property="og:image" content="http://alonecong.github.io/blog-pic/2019-03-31-19-45-19.png">
<meta property="og:image" content="http://alonecong.github.io/_image/2019-03-24-23-41-54.png">
<meta property="og:updated_time" content="2019-06-23T06:39:33.575Z">
<meta name="twitter:card" content="summary">
<meta name="twitter:title" content="一条更新语句是如何执行的">
<meta name="twitter:description" content="一条更新语句是如何执行的？复习之前学过的内容，分析器，解析器，优化器，执行器 。更新流程和查询不一样，会涉及到2个重要的日志，一个redo log ，一个是bin log 。 Redo Log redo log 属于innodb 引擎的日志 mysql中的WAL 技术，全称 write-ahead-loging ，关键点，先写内存后写磁盘，更新到内存更新就算完成了，innodb会在系统空闲时">
<meta name="twitter:image" content="http://alonecong.github.io/blog-pic/2019-03-31-19-45-19.png">
<script type="text/javascript" id="hexo.configurations">
var NexT = window.NexT || {};
var CONFIG = {
root: '/',
scheme: 'Muse',
version: '5.1.3',
sidebar: {"position":"left","display":"hide","offset":12,"b2t":false,"scrollpercent":true,"onmobile":true},
fancybox: true,
tabs: true,
motion: {"enable":true,"async":true,"transition":{"post_block":"perspectiveLeftIn","post_header":"fadeIn","post_body":"fadeIn","coll_header":"perspectiveLeftIn","sidebar":"slideUpIn"}},
duoshuo: {
userId: 'undefined',
author: '博主'
},
algolia: {
applicationID: '',
apiKey: '',
indexName: '',
hits: "",
labels: ""
}
};
</script>
<link rel="canonical" href="http://alonecong.github.io/mysql2.html">
<title>一条更新语句是如何执行的 | 雨正来【一路奔跑的人】</title>
</head>
<body itemscope itemtype="http://schema.org/WebPage" lang="zh-Hans">
<div class="container sidebar-position-left page-post-detail">
<div class="headband"></div>
<a href="https://github.com/alonecong"><img width="149" height="149" src="https://github.blog/wp-content/uploads/2008/12/forkme_right_darkblue_121621.png?resize=149%2C149" class="attachment-full size-full" alt="Fork me on GitHub" data-recalc-dims="1"></a>
<header id="header" class="header" itemscope itemtype="http://schema.org/WPHeader">
<div class="header-inner"><div class="site-brand-wrapper">
<div class="site-meta ">
<div class="custom-logo-site-title">
<a href="/" class="brand" rel="start">
<span class="logo-line-before"><i></i></span>
<span class="site-title">雨正来【一路奔跑的人】</span>
<span class="logo-line-after"><i></i></span>
</a>
</div>
<p class="site-subtitle"></p>
</div>
<div class="site-nav-toggle">
<button>
<span class="btn-bar"></span>
<span class="btn-bar"></span>
<span class="btn-bar"></span>
</button>
</div>
</div>
<nav class="site-nav">
<ul id="menu" class="menu">
<li class="menu-item menu-item-home">
<a href="/" rel="section">
<i class="menu-item-icon fa fa-fw fa-home"></i> <br>
首页
</a>
</li>
<li class="menu-item menu-item-archives">
<a href="/archives/" rel="section">
<i class="menu-item-icon fa fa-fw fa-archive"></i> <br>
归档
</a>
</li>
<li class="menu-item menu-item-categories">
<a href="/categories/" rel="section">
<i class="menu-item-icon fa fa-fw fa-th"></i> <br>
分类
</a>
</li>
<li class="menu-item menu-item-tags">
<a href="/tags/" rel="section">
<i class="menu-item-icon fa fa-fw fa-tags"></i> <br>
标签
</a>
</li>
<li class="menu-item menu-item-top">
<a href="/top/" rel="section">
<i class="menu-item-icon fa fa-fw fa-signal"></i> <br>
top
</a>
</li>
<li class="menu-item menu-item-about">
<a href="/about/" rel="section">
<i class="menu-item-icon fa fa-fw fa-futbol-o"></i> <br>
关于
</a>
</li>
<li class="menu-item menu-item-search">
<a href="javascript:;" class="popup-trigger">
<i class="menu-item-icon fa fa-search fa-fw"></i> <br>
搜索
</a>
</li>
</ul>
<div class="site-search">
<div class="popup search-popup local-search-popup">
<div class="local-search-header clearfix">
<span class="search-icon">
<i class="fa fa-search"></i>
</span>
<span class="popup-btn-close">
<i class="fa fa-times-circle"></i>
</span>
<div class="local-search-input-wrapper">
<input autocomplete="off" placeholder="搜索..." spellcheck="false" type="text" id="local-search-input">
</div>
</div>
<div id="local-search-result"></div>
</div>
</div>
</nav>
</div>
</header>
<main id="main" class="main">
<div class="main-inner">
<div class="content-wrap">
<div id="content" class="content">
<div id="posts" class="posts-expand">
<article class="post post-type-normal" itemscope itemtype="http://schema.org/Article">
<div class="post-block">
<link itemprop="mainEntityOfPage" href="http://alonecong.github.io/mysql2.html">
<span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
<meta itemprop="name" content="lancecong">
<meta itemprop="description" content>
<meta itemprop="image" content="/uploads/avatar.gif">
</span>
<span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
<meta itemprop="name" content="雨正来【一路奔跑的人】">
</span>
<header class="post-header">
<h1 class="post-title" itemprop="name headline">一条更新语句是如何执行的</h1>
<div class="post-meta">
<span class="post-time">
<span class="post-meta-item-icon">
<i class="fa fa-calendar-o"></i>
</span>
<span class="post-meta-item-text">发表于</span>
<time title="创建于" itemprop="dateCreated datePublished" datetime="2019-03-31T17:32:32+08:00">
2019-03-31
</time>
</span>
<span class="post-category">
<span class="post-meta-divider">|</span>
<span class="post-meta-item-icon">
<i class="fa fa-folder-o"></i>
</span>
<span class="post-meta-item-text">分类于</span>
<span itemprop="about" itemscope itemtype="http://schema.org/Thing">
<a href="/categories/编程/" itemprop="url" rel="index">
<span itemprop="name">编程</span>
</a>
</span>
</span>
<span class="post-comments-count">
<span class="post-meta-divider">|</span>
<span class="post-meta-item-icon">
<i class="fa fa-comment-o"></i>
</span>
<a href="/mysql2.html#comments" itemprop="discussionUrl">
<span class="post-comments-count valine-comment-count" data-xid="/mysql2.html" itemprop="commentCount"></span>
</a>
</span>
<span id="/mysql2.html" class="leancloud_visitors" data-flag-title="一条更新语句是如何执行的">
<span class="post-meta-divider">|</span>
<span class="post-meta-item-icon">
<i class="fa fa-eye"></i>
</span>
<span class="post-meta-item-text">阅读次数:</span>
<span class="leancloud-visitors-count"></span>
</span>
<div class="post-wordcount">
<span class="post-meta-divider">|</span>
<span class="post-meta-item-icon">
<i class="fa fa-file-word-o"></i>
</span>
<span class="post-meta-item-text">字数统计:</span>
<span title="字数统计">
846
</span>
</div>
</div>
</header>
<div class="post-body" itemprop="articleBody">
<h1 id="一条更新语句是如何执行的？"><a href="#一条更新语句是如何执行的？" class="headerlink" title="一条更新语句是如何执行的？"></a>一条更新语句是如何执行的？</h1><p>复习之前学过的内容，分析器，解析器，优化器，执行器 。更新流程和查询不一样，会涉及到2个重要的日志，一个redo log ，一个是bin log 。</p>
<h2 id="Redo-Log"><a href="#Redo-Log" class="headerlink" title="Redo Log"></a>Redo Log</h2><blockquote>
<p> redo log 属于innodb 引擎的日志 </p>
<ul>
<li>mysql中的WAL 技术，全称 write-ahead-loging ，关键点，先写内存后写磁盘，更新到内存更新就算完成了，innodb会在系统空闲时候去做写入磁盘操作。<ul>
<li>redo log 是固定大小的，比如配置4个大小为1G的文件，从头开始写，写到3的末尾结束。</li>
<li>write pos 和 check point 中间的位置是可以写入的内容，2个pos 都是向前推进的，当write 追上check的位置时，不能执行更新，需要check 往前进行推进。即使数据库发生异常，mysql 也能保证之前提交的记录保存下来，这个机制叫做<strong>crash-safe</strong> 。<br><img src="/../../../blog-pic/2019-03-31-19-45-19.png" alt></li>
</ul>
</li>
</ul>
</blockquote>
<h2 id="Bin-log"><a href="#Bin-log" class="headerlink" title="Bin log"></a>Bin log</h2><blockquote>
<p> binlog 属于server层的日志 ，binlog 有二种模式，一种是statement 另外是row ，statement 格式的话是记sql语句， row格式会记录行的内容，记两条，更 新前和更新后都有。<br>注： mysql 其实就2块，一块server层 另外一块是引擎层 。</p>
</blockquote>
<h2 id="redo-log-和-binlog-的不同点"><a href="#redo-log-和-binlog-的不同点" class="headerlink" title="redo log 和 binlog 的不同点"></a>redo log 和 binlog 的不同点</h2><ol>
<li>redo log 属于引擎层，binlog 属于server层。</li>
<li>redo log 记录是的物理的日志，例如 “某个数据项上进行了修改”，binlog 是逻辑日志，记录这个语句的原始逻辑，例如 给id 为2 的c字段加一。</li>
<li>redo log 可以循环写，空间固定会用完，binlog 进行追加写，写到固定大小后，换另外一块写，不会覆盖。<a id="more"></a>
<h2 id="分析下一个sql-更新的过程"><a href="#分析下一个sql-更新的过程" class="headerlink" title="分析下一个sql 更新的过程"></a>分析下一个sql 更新的过程</h2><blockquote>
<p> 例如更新一个表中id=2 的数据 </p>
</blockquote>
</li>
</ol>
<ul>
<li>首先执行器先找出id=2 的记录，id 是索引，通过索引树查询这条记录，判断如果在当前数据页中，直接返回给执行器，如果不是要从磁盘读取到内容，之后返回给执行器。</li>
<li>之后这行c 的值进行加一操作，写入到新行中。</li>
<li>新行数据写入到内存中，之后写入redolog 这个时候redo log处于 prepare 准备阶段。</li>
<li>mysql 写入binlog ，提交事务处于commit 状态，提交完成。<br><img src="./_image/2019-03-24-23-41-54.png" alt></li>
</ul>
<h2 id="二阶段提交"><a href="#二阶段提交" class="headerlink" title="二阶段提交"></a>二阶段提交</h2><blockquote>
<p>这里写入日志分为prepare 和 commit 二个阶段，这就属于2阶段提交。<br>首先数据库要根据自己的业务每天或者是2天进行一次全量的备份，可以编写定时脚本取做，cornb ？<br>所谓的二阶段提交就是保证redo log 和 bin log 保持逻辑上的一致。</p>
</blockquote>
<h3 id="思考"><a href="#思考" class="headerlink" title="思考"></a>思考</h3><ul>
<li>如果先写redo log 后写 binlog 不使用二阶段提交会出什么问题？</li>
<li>如果写bin log 后 redo log 有什么样的问题发生？<br>不仅仅是mysql 崩溃时候 出现数据不一致，还有可能在数据扩容的时候发生不一致的情况，如果不采用二阶段提交。<h2 id="小结"><a href="#小结" class="headerlink" title="小结"></a>小结</h2><strong>redo log </strong> 有一个参数<strong> innodb-flush-log-at-trx-commit 设置成1</strong> ，表示每次事务的redo 日志都持久化到磁盘，这样mysql 异常重启之后数据不会丢失。<br><strong>binlog </strong>参数 <strong>sync-binlog 设置成1</strong> ，表示每次事务binlog 都写入磁盘，mysql重启数据不会丢失。</li>
</ul>
</div>
<div>
<div class="note warning">
<p>本文欢迎转载，但是希望注明出处并给出原文链接。
如果你有任何疑问，欢迎在下方评论区留言，我会尽快答复。
如果你喜欢或者不喜欢这篇文章，欢迎你发邮件到 alonecong@126.com 告诉我你的想法，你的建议对我非常重要。
</p></div>
<div style="text-align:center;color: #ccc;font-size:14px;">
------ 本文结束<i class="fa fa-paw"></i>感谢您的阅读！ ------</div>
</div>
<div>
<ul class="post-copyright">
<li class="post-copyright-author">
<strong>本文作者：</strong>
lancecong
</li>
<li class="post-copyright-link">
<strong>本文链接：</strong>
<a href="http://alonecong.github.io/mysql2.html" title="一条更新语句是如何执行的">http://alonecong.github.io/mysql2.html</a>
</li>
<li class="post-copyright-license">
<strong>版权声明： </strong>
本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/3.0/" rel="external nofollow" target="_blank">CC BY-NC-SA 3.0</a> 许可协议。转载请注明出处！
</li>
</ul>
</div>
<footer class="post-footer">
<div class="post-tags">
<a href="/tags/数据库/" rel="tag"># 数据库</a>
</div>
<div class="post-widgets">
<div class="wp_rating">
<div style="color: rgba(0, 0, 0, 0.75); font-size:13px; letter-spacing:3px">(>看完记得五星好评哦亲<)</div>
<div id="wpac-rating"></div>
</div>
</div>
<div class="post-nav">
<div class="post-nav-next post-nav-item">
<a href="/mysql1.html" rel="next" title="数据库的四大特效和隔离级别">
<i class="fa fa-chevron-left"></i> 数据库的四大特效和隔离级别
</a>
</div>
<span class="post-nav-divider"></span>
<div class="post-nav-prev post-nav-item">
<a href="/mysql4.html" rel="prev" title="mysql优化练习">
mysql优化练习 <i class="fa fa-chevron-right"></i>
</a>
</div>
</div>
</footer>
</div>
</article>
<div class="post-spread">
</div>
</div>
</div>
<div class="comments" id="comments">
</div>
</div>
<div class="sidebar-toggle">
<div class="sidebar-toggle-line-wrap">
<span class="sidebar-toggle-line sidebar-toggle-line-first"></span>
<span class="sidebar-toggle-line sidebar-toggle-line-middle"></span>
<span class="sidebar-toggle-line sidebar-toggle-line-last"></span>
</div>
</div>
<aside id="sidebar" class="sidebar">
<div id="sidebar-dimmer"></div>
<div class="sidebar-inner">
<ul class="sidebar-nav motion-element">
<li class="sidebar-nav-toc sidebar-nav-active" data-target="post-toc-wrap">
文章目录
</li>
<li class="sidebar-nav-overview" data-target="site-overview-wrap">
站点概览
</li>
</ul>
<section class="site-overview-wrap sidebar-panel">
<div class="site-overview">
<div class="site-author motion-element" itemprop="author" itemscope itemtype="http://schema.org/Person">
<img class="site-author-image" itemprop="image" src="/uploads/avatar.gif" alt="lancecong">
<p class="site-author-name" itemprop="name">lancecong</p>
<p class="site-description motion-element" itemprop="description"></p>
</div>
<nav class="site-state motion-element">
<div class="site-state-item site-state-posts">
<a href="/archives/">
<span class="site-state-item-count">68</span>
<span class="site-state-item-name">日志</span>
</a>
</div>
<div class="site-state-item site-state-categories">
<a href="/categories/index.html">
<span class="site-state-item-count">9</span>
<span class="site-state-item-name">分类</span>
</a>
</div>
<div class="site-state-item site-state-tags">
<a href="/tags/index.html">
<span class="site-state-item-count">32</span>
<span class="site-state-item-name">标签</span>
</a>
</div>
</nav>
<div class="links-of-blogroll motion-element links-of-blogroll-inline">
<div class="links-of-blogroll-title">
<i class="fa fa-fw fa-globe"></i>
点下试试
</div>
<ul class="links-of-blogroll-list">
<li class="links-of-blogroll-item">
<a href="https://music.163.com/#/user/home?id=86590096" title="😆 网易云音乐 😆" target="_blank">😆 网易云音乐 😆</a>
</li>
<li class="links-of-blogroll-item">
<a href="http://coldplay.com/" title="Coldplay Official Website" target="_blank">Coldplay Official Website</a>
</li>
<li class="links-of-blogroll-item">
<a href="https://elonmusknews.org/" title="获取 Elon Musk 的新闻" target="_blank">获取 Elon Musk 的新闻</a>
</li>
<li class="links-of-blogroll-item">
<a href="http://www.bilibili.com/video/av6211226/" title="尼古拉·特斯拉：发明了现代世界的人" target="_blank">尼古拉·特斯拉：发明了现代世界的人</a>
</li>
</ul>
</div>
</div>
</section>
<!--noindex-->
<section class="post-toc-wrap motion-element sidebar-panel sidebar-panel-active">
<div class="post-toc">
<div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-1"><a class="nav-link" href="#一条更新语句是如何执行的？"><span class="nav-number">1.</span> <span class="nav-text">一条更新语句是如何执行的？</span></a><ol class="nav-child"><li class="nav-item nav-level-2"><a class="nav-link" href="#Redo-Log"><span class="nav-number">1.1.</span> <span class="nav-text">Redo Log</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#Bin-log"><span class="nav-number">1.2.</span> <span class="nav-text">Bin log</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#redo-log-和-binlog-的不同点"><span class="nav-number">1.3.</span> <span class="nav-text">redo log 和 binlog 的不同点</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#分析下一个sql-更新的过程"><span class="nav-number">1.4.</span> <span class="nav-text">分析下一个sql 更新的过程</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#二阶段提交"><span class="nav-number">1.5.</span> <span class="nav-text">二阶段提交</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#思考"><span class="nav-number">1.5.1.</span> <span class="nav-text">思考</span></a></li></ol></li><li class="nav-item nav-level-2"><a class="nav-link" href="#小结"><span class="nav-number">1.6.</span> <span class="nav-text">小结</span></a></li></ol></li></ol></div>
</div>
</section>
<!--/noindex-->
</div>
</aside>
</div>
</main>
<footer id="footer" class="footer">
<div class="footer-inner">
<div class="copyright">© 2017 — <span itemprop="copyrightYear">2020</span>
<span class="with-love">
<i class="fa fa-heart"></i>
</span>
<span class="author" itemprop="copyrightHolder">lancecong</span>
</div>
<div class="weixin-box">
<div class="weixin-menu">
<div class="weixin-hover">
<div class="weixin-description">微信扫一扫,call me !</div>
</div>
</div>
</div>
<div class="busuanzi-count">
<script async src="http://busuanzi.ibruce.info/busuanzi/2.3/busuanzi.pure.mini.js"></script>
<span class="site-uv">
<i class="fa fa-user-circle-o"></i>
<span class="busuanzi-value" id="busuanzi_value_site_uv"></span>
</span>
<span class="site-pv">
<span class="busuanzi-value" id="busuanzi_value_site_pv"></span>
<i class="fa fa-eye"></i>
</span>
</div>
</div>
</footer>
<div class="back-to-top">
<i class="fa fa-arrow-up"></i>
<span id="scrollpercent"><span>0</span>%</span>
</div>
</div>
<script type="text/javascript">
if (Object.prototype.toString.call(window.Promise) !== '[object Function]') {
window.Promise = null;
}
</script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/fastclick/1.0.6/fastclick.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery_lazyload/1.9.7/jquery.lazyload.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/velocity/1.2.1/velocity.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/velocity/1.2.1/velocity.ui.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/fancybox/3.2.5/jquery.fancybox.min.js"></script>
<script type="text/javascript" src="/js/src/utils.js?v=5.1.3"></script>
<script type="text/javascript" src="/js/src/motion.js?v=5.1.3"></script>
<script type="text/javascript" src="/js/src/scrollspy.js?v=5.1.3"></script>
<script type="text/javascript" src="/js/src/post-details.js?v=5.1.3"></script>
<script type="text/javascript" src="/js/src/bootstrap.js?v=5.1.3"></script>
<script src="//cdn1.lncld.net/static/js/3.0.4/av-min.js"></script>
<script src="//unpkg.com/valine/dist/Valine.min.js"></script>