From 800b1e1b84e7c88a6b0157feb88ebfa53c8c828b Mon Sep 17 00:00:00 2001 From: nicksxs Date: Sun, 26 Apr 2020 22:20:44 +0800 Subject: [PATCH] Site updated: 2020-04-26 22:20:34 --- 2014/12/23/my-new-post/index.html | 8 +- 2014/12/24/MFC 模态对话框/index.html | 12 +- 2014/12/30/Clone-Graph-Part-I/index.html | 22 +- 2015/01/04/Path-Sum/index.html | 16 +- 2015/01/14/Two-Sum/index.html | 14 +- .../index.html | 14 +- 2015/03/11/Number-Of-1-Bits/index.html | 16 +- 2015/03/11/Reverse-Bits/index.html | 14 +- 2015/03/13/Reverse-Integer/index.html | 14 +- 2015/04/14/Add-Two-Number/index.html | 14 +- 2015/04/15/Leetcode-No-3/index.html | 14 +- 2015/06/22/invert-binary-tree/index.html | 14 +- 2016/07/13/swoole-websocket-test/index.html | 8 +- 2016/08/14/34-Search-for-a-Range/index.html | 14 +- 2016/08/14/docker-mysql-cluster/index.html | 14 +- 2016/09/29/binary-watch/index.html | 14 +- .../minimum-size-subarray-sum-209/index.html | 14 +- 2016/10/12/summary-ranges-228/index.html | 14 +- .../index.html | 8 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2020/04/26/聊聊-mysql-的-MVCC/index.html create mode 100644 categories/C/Mysql/index.html create mode 100644 categories/Mysql/index.html create mode 100644 categories/Mysql/数据结构/index.html create mode 100644 categories/Mysql/源码/index.html create mode 100644 tags/mvcc/index.html create mode 100644 tags/read-view/index.html diff --git a/2014/12/23/my-new-post/index.html b/2014/12/23/my-new-post/index.html index c689241738..140e0b07e3 100644 --- a/2014/12/23/my-new-post/index.html +++ b/2014/12/23/my-new-post/index.html @@ -421,20 +421,20 @@
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diff --git a/2014/12/24/MFC 模态对话框/index.html b/2014/12/24/MFC 模态对话框/index.html index b12af3021f..96aef674e6 100644 --- a/2014/12/24/MFC 模态对话框/index.html +++ b/2014/12/24/MFC 模态对话框/index.html @@ -300,10 +300,10 @@
leetcode no.3
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    diff --git a/2020/04/26/聊聊-mysql-的-MVCC/index.html b/2020/04/26/聊聊-mysql-的-MVCC/index.html new file mode 100644 index 0000000000..afd7052b06 --- /dev/null +++ b/2020/04/26/聊聊-mysql-的-MVCC/index.html @@ -0,0 +1,771 @@ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + 聊聊 mysql 的 MVCC | Nicksxs's Blog + + + + + + + + + + + + + + + + +
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    + 聊聊 mysql 的 MVCC +

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    + + +

    很久以前，有位面试官问到，你知道 mysql 的事务隔离级别吗，“额 O__O …，不太清楚”，完了之后我就去网上找相关的文章，找到了这篇MySQL 四种事务隔离级的说明, 文章写得特别好，看了这个就懂了各个事务隔离级别都是啥，不过看了这个之后多思考一下的话还是会发现问题，这么神奇的事务隔离级别是怎么实现的呢

    +

    其中 innodb 的事务隔离用到了标题里说到的 mvcc，Multiversion concurrency control, 直译过来就是多版本并发控制，先不讲这个究竟是个啥，考虑下如果纯猜测，这个事务隔离级别应该会是怎么样实现呢，愚钝的我想了下，可以在事务开始的时候拷贝一个表，这个可以支持 RR 级别，RC 级别就不支持了，而且要是个非常大的表，想想就不可行

    +

    腆着脸说虽然这个不可行，但是思路是对的，具体实行起来需要做一系列（肥肠多）的改动，首先根据我的理解，其实这个拷贝一个表是变成拷贝一条记录，但是如果有多个事务，那就得拷贝多次，这个问题其实可以借助版本管理系统来解释，在用版本管理系统，git 之类的之前，很原始的可能是开发完一个功能后，就打个压缩包用时间等信息命名，然后如果后面要找回这个就直接用这个压缩包的就行了，后来有了 svn，git 中心式和分布式的版本管理系统，它的一个特点是粒度可以控制到文件和代码行级别，对应的我们的 mysql 事务是不是也可以从一开始预想的表级别细化到行的级别，可能之前很多人都了解过，数据库的一行记录除了我们用户自定义的字段，还有一些额外的字段，去源码data0type.h里捞一下

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    /* Precise data types for system columns and the length of those columns;
    NOTE: the values must run from 0 up in the order given! All codes must
    be less than 256 */
    #define DATA_ROW_ID 0     /* row id: a 48-bit integer */
    #define DATA_ROW_ID_LEN 6 /* stored length for row id */

    /** Transaction id: 6 bytes */
    constexpr size_t DATA_TRX_ID = 1;

    /** Transaction ID type size in bytes. */
    constexpr size_t DATA_TRX_ID_LEN = 6;

    /** Rollback data pointer: 7 bytes */
    constexpr size_t DATA_ROLL_PTR = 2;

    /** Rollback data pointer type size in bytes. */
    constexpr size_t DATA_ROLL_PTR_LEN = 7;
    + +

    一个是 DATA_ROW_ID，这个是在数据没指定主键的时候会生成一个隐藏的，如果用户有指定主键就是主键了

    +

    一个是 DATA_TRX_ID，这个表示这条记录的事务 ID

    +

    还有一个是 DATA_ROLL_PTR 指向回滚段的指针

    +

    指向的回滚段其实就是我们常说的 undo log，这里面的具体结构就是个链表，在 mvcc 里会使用到这个，还有就是这个 DATA_TRX_ID，每条记录都记录了这个事务 ID，表示的是这条记录的当前值是被哪个事务修改的，下面就扯回事务了，我们知道 Read Uncommitted， 其实用不到隔离，直接读取当前值就好了，到了 Read Committed 级别，我们要让事务读取到提交过的值，mysql 使用了一个叫 read view 的玩意，它里面有这些值是我们需要注意的，

    +

    m_low_limit_id, 这个是 read view 创建时最大的活跃事务 id

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    m_up_limit_id, 这个是 read view 创建时最小的活跃事务 id

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    m_ids, 这个是 read view 创建时所有的活跃事务 id 数组

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    m_creator_trx_id 这个是当前记录的创建事务 id

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    判断事务的可见性主要的逻辑是这样，

    +
      +
    1. 当记录的事务 id 小于最小活跃事务 id，说明是可见的，
      2. +
    2. 如果记录的事务 id 等于当前事务 id，说明是自己的更改，可见
      3. +
    3. 如果记录的事务 id 大于最大的活跃事务 id, 不可见
      4. +
    4. 如果记录的事务 id 介于 m_low_limit_id 和 m_up_limit_id 之间，则要判断它是否在 m_ids 中，如果在，不可见，如果不在，表示已提交，可见
      具体的代码捞一下看看
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      /** Check whether the changes by id are visible.
        @param[in]	id	transaction id to check against the view
        @param[in]	name	table name
        @return whether the view sees the modifications of id. */
        bool changes_visible(trx_id_t id, const table_name_t &name) const
            MY_ATTRIBUTE((warn_unused_result)) {
          ut_ad(id > 0);

          if (id < m_up_limit_id || id == m_creator_trx_id) {
            return (true);
          }

          check_trx_id_sanity(id, name);

          if (id >= m_low_limit_id) {
            return (false);

          } else if (m_ids.empty()) {
            return (true);
          }

          const ids_t::value_type *p = m_ids.data();

          return (!std::binary_search(p, p + m_ids.size(), id));
        }
      +剩下来一点是啥呢，就是 Read Committed 和 Repeated Read 也不一样，那前面说的 read view 都能支持吗，又是怎么支持呢，假如这个 read view 是在事务一开始就创建，那好像能支持的只是 RR 事务隔离级别，其实呢，这是通过创建 read view的时机，对于 RR 级别，就是在事务的第一个 select 语句是创建，对于 RC 级别，是在每个 select 语句执行前都是创建一次，那样就可以保证能读到所有已提交的数据
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    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
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    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
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    diff --git a/archives/2015/03/index.html b/archives/2015/03/index.html index 2b3072e657..e2f554430d 100644 --- a/archives/2015/03/index.html +++ b/archives/2015/03/index.html @@ -208,7 +208,7 @@
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    diff --git a/archives/2015/04/index.html b/archives/2015/04/index.html index 9f3cf1906a..99fd90793f 100644 --- a/archives/2015/04/index.html +++ b/archives/2015/04/index.html @@ -208,7 +208,7 @@
    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
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    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
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    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
    @@ -310,20 +310,20 @@
    - 46 + 47 posts
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    - 58 + 60 tags
    @@ -348,7 +348,7 @@
    diff --git a/archives/2016/10/index.html b/archives/2016/10/index.html index bd9b0ce058..2e3833aaff 100644 --- a/archives/2016/10/index.html +++ b/archives/2016/10/index.html @@ -208,7 +208,7 @@
    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
    @@ -330,20 +330,20 @@
    - 46 + 47 posts
    - 34 + 38 categories
    - 58 + 60 tags
    @@ -368,7 +368,7 @@
    diff --git a/archives/2016/11/index.html b/archives/2016/11/index.html index 9a231c66c7..97d80e5864 100644 --- a/archives/2016/11/index.html +++ b/archives/2016/11/index.html @@ -208,7 +208,7 @@
    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
    @@ -310,20 +310,20 @@
    - 46 + 47 posts
    - 34 + 38 categories
    - 58 + 60 tags
    @@ -348,7 +348,7 @@
    diff --git a/archives/2016/index.html b/archives/2016/index.html index 5d22b48996..e381a36141 100644 --- a/archives/2016/index.html +++ b/archives/2016/index.html @@ -208,7 +208,7 @@
    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
    @@ -430,20 +430,20 @@
    - 46 + 47 posts
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    - 58 + 60 tags
    @@ -468,7 +468,7 @@
    diff --git a/archives/2017/03/index.html b/archives/2017/03/index.html index 290f7d57d4..7752622522 100644 --- a/archives/2017/03/index.html +++ b/archives/2017/03/index.html @@ -208,7 +208,7 @@
    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
    @@ -310,20 +310,20 @@
    - 46 + 47 posts
    - 34 + 38 categories
    - 58 + 60 tags
    @@ -348,7 +348,7 @@
    diff --git a/archives/2017/04/index.html b/archives/2017/04/index.html index 7f1c18b3cc..f930777320 100644 --- a/archives/2017/04/index.html +++ b/archives/2017/04/index.html @@ -208,7 +208,7 @@
    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
    @@ -310,20 +310,20 @@
    - 46 + 47 posts
    - 34 + 38 categories
    - 58 + 60 tags
    @@ -348,7 +348,7 @@
    diff --git a/archives/2017/05/index.html b/archives/2017/05/index.html index 5fad69c091..4e29aa0876 100644 --- a/archives/2017/05/index.html +++ b/archives/2017/05/index.html @@ -208,7 +208,7 @@
    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
    @@ -310,20 +310,20 @@
    - 46 + 47 posts
    - 34 + 38 categories
    - 58 + 60 tags
    @@ -348,7 +348,7 @@
    diff --git a/archives/2017/index.html b/archives/2017/index.html index be4159d111..1037e4e3fd 100644 --- a/archives/2017/index.html +++ b/archives/2017/index.html @@ -208,7 +208,7 @@
    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
    @@ -350,20 +350,20 @@
    - 46 + 47 posts
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    @@ -388,7 +388,7 @@
    diff --git a/archives/2019/06/index.html b/archives/2019/06/index.html index b2ee598a52..ba2b935baa 100644 --- a/archives/2019/06/index.html +++ b/archives/2019/06/index.html @@ -208,7 +208,7 @@
    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
    @@ -310,20 +310,20 @@
    - 46 + 47 posts
    - 34 + 38 categories
    - 58 + 60 tags
    @@ -348,7 +348,7 @@
    diff --git a/archives/2019/09/index.html b/archives/2019/09/index.html index a54c2fd22b..297b837862 100644 --- a/archives/2019/09/index.html +++ b/archives/2019/09/index.html @@ -208,7 +208,7 @@
    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
    @@ -310,20 +310,20 @@
    - 46 + 47 posts
    - 34 + 38 categories
    - 58 + 60 tags
    @@ -348,7 +348,7 @@
    diff --git a/archives/2019/12/index.html b/archives/2019/12/index.html index 0452e5b6b2..159fe9920f 100644 --- a/archives/2019/12/index.html +++ b/archives/2019/12/index.html @@ -208,7 +208,7 @@
    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
    @@ -390,20 +390,20 @@
    - 46 + 47 posts
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    @@ -428,7 +428,7 @@
    diff --git a/archives/2019/index.html b/archives/2019/index.html index 7879c1ac6e..20b36af542 100644 --- a/archives/2019/index.html +++ b/archives/2019/index.html @@ -208,7 +208,7 @@
    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
    @@ -430,20 +430,20 @@
    - 46 + 47 posts
    - 34 + 38 categories
    - 58 + 60 tags
    @@ -468,7 +468,7 @@
    diff --git a/archives/2020/01/index.html b/archives/2020/01/index.html index 825b92d00e..6086a40a81 100644 --- a/archives/2020/01/index.html +++ b/archives/2020/01/index.html @@ -208,7 +208,7 @@
    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
    @@ -390,20 +390,20 @@
    - 46 + 47 posts
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    - 58 + 60 tags
    @@ -428,7 +428,7 @@
    diff --git a/archives/2020/02/index.html b/archives/2020/02/index.html index 688cef8eba..2788d5dede 100644 --- a/archives/2020/02/index.html +++ b/archives/2020/02/index.html @@ -208,7 +208,7 @@
    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
    @@ -370,20 +370,20 @@
    - 46 + 47 posts
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    @@ -408,7 +408,7 @@
    diff --git a/archives/2020/03/index.html b/archives/2020/03/index.html index 33d94f171f..15445ffad4 100644 --- a/archives/2020/03/index.html +++ b/archives/2020/03/index.html @@ -208,7 +208,7 @@
    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
    @@ -390,20 +390,20 @@
    - 46 + 47 posts
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    @@ -428,7 +428,7 @@
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    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
    @@ -216,6 +216,26 @@ 2020
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    @@ -350,20 +370,20 @@
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    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
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    @@ -493,20 +493,20 @@
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    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
    @@ -216,6 +216,26 @@ 2020
    + +
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    - 46 + 47 posts
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    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
    @@ -216,6 +216,26 @@ 2020
    + +
    @@ -396,26 +416,6 @@
    - -
    @@ -493,20 +493,20 @@
    - 46 + 47 posts
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    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
    @@ -216,6 +216,26 @@ 2020
    + +
    @@ -399,26 +419,6 @@
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    @@ -496,20 +496,20 @@
    - 46 + 47 posts
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    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
    @@ -216,6 +216,26 @@ 2019
    + +
    @@ -402,26 +422,6 @@
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    @@ -499,20 +499,20 @@
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    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
    @@ -216,6 +216,26 @@ 2016
    + +
    @@ -399,26 +419,6 @@
    - -
    @@ -496,20 +496,20 @@
    - 46 + 47 posts
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    - OK! 46 posts in total. Keep on posting. + OK! 47 posts in total. Keep on posting.
    @@ -216,6 +216,26 @@ 2015
    + +
    @@ -416,20 +436,20 @@
    - 46 + 47 posts
    - 34 + 38 categories
    - 58 + 60 tags
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    diff --git a/atom.xml b/atom.xml index 4cc2c70602..65adc8863e 100644 --- a/atom.xml +++ b/atom.xml @@ -6,7 +6,7 @@ - 2020-04-19T09:28:42.555Z + 2020-04-26T14:16:52.788Z https://nicksxs.me/ @@ -16,6 +16,49 @@ Hexo + + 聊聊 mysql 的 MVCC + + https://nicksxs.me/2020/04/26/%E8%81%8A%E8%81%8A-mysql-%E7%9A%84-MVCC/ + 2020-04-26T14:14:01.000Z + 2020-04-26T14:16:52.788Z + + + + + + + + <p>很久以前，有位面试官问到，你知道 mysql 的事务隔离级别吗，“额 O__O …，不太清楚”，完了之后我就去网上找相关的文章，找到了这篇<a href="https://www.cnblogs.com/zhoujinyi/p/3437475.html" + + + + + + + + + + + + + + + + + + + + + + + + + + + + + redis系列介绍八-淘汰策略 @@ -38,14 +81,14 @@ - - - + + + @@ -77,14 +120,14 @@ - - - + + + @@ -397,10 +440,10 @@ - - + + @@ -476,14 +519,14 @@ - - - + + + @@ -515,14 +558,14 @@ - - - + + + @@ -554,14 +597,14 @@ - - - + + + @@ -594,14 +637,14 @@ - - - + + + @@ -633,14 +676,14 @@ - - - + + + @@ -672,14 +715,14 @@ - - - + + + @@ -726,35 +769,4 @@ - - 村上春树《1Q84》读后感 - - https://nicksxs.me/2019/12/18/1Q84%E8%AF%BB%E5%90%8E%E6%84%9F/ - 2019-12-17T16:33:09.000Z - 2019-12-18T16:08:42.000Z - - - - - - - - <p>看完了村上春树的《1Q84》，这应该是第五本看的他的书了，继 - - - - - - - - - - - - - - - - - diff --git a/baidu_verify_Gl8jtoDV4z.html b/baidu_verify_Gl8jtoDV4z.html index b30bd0f72a..29b831bc5c 100644 --- a/baidu_verify_Gl8jtoDV4z.html +++ b/baidu_verify_Gl8jtoDV4z.html @@ -309,20 +309,20 @@
    - 46 + 47 posts
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    - 58 + 60 tags
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    diff --git a/baidusitemap.xml b/baidusitemap.xml index d92628fb60..bcfcf75350 100644 --- a/baidusitemap.xml +++ b/baidusitemap.xml @@ -1,6 +1,9 @@ + https://nicksxs.me/2020/04/26/%E8%81%8A%E8%81%8A-mysql-%E7%9A%84-MVCC/ + 2020-04-26 + https://nicksxs.me/2020/04/18/redis%E7%B3%BB%E5%88%97%E4%BB%8B%E7%BB%8D%E5%85%AB/ 2020-04-19 @@ -45,33 +48,33 @@ https://nicksxs.me/2020/01/19/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D%E5%9B%9B/ 2020-01-18 - - https://nicksxs.me/2015/01/14/Two-Sum/ - 2020-01-12 https://nicksxs.me/2019/12/10/Redis-Part-1/ 2020-01-12 - https://nicksxs.me/2016/11/10/php-abstract-class-and-interface/ + https://nicksxs.me/2015/01/14/Two-Sum/ 2020-01-12 https://nicksxs.me/2016/09/29/binary-watch/ 2020-01-12 - https://nicksxs.me/2019/12/26/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D/ + https://nicksxs.me/2016/11/10/php-abstract-class-and-interface/ 2020-01-12 - https://nicksxs.me/2015/04/14/Add-Two-Number/ + https://nicksxs.me/2019/12/26/redis%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84%E4%BB%8B%E7%BB%8D/ 2020-01-12 https://nicksxs.me/2015/03/13/Reverse-Integer/ 2020-01-12 - https://nicksxs.me/2016/08/14/docker-mysql-cluster/ + https://nicksxs.me/2015/04/14/Add-Two-Number/ 2020-01-12 https://nicksxs.me/2014/12/24/MFC%20%E6%A8%A1%E6%80%81%E5%AF%B9%E8%AF%9D%E6%A1%86/ 2020-01-12 + + https://nicksxs.me/2016/08/14/docker-mysql-cluster/ + 2020-01-12 https://nicksxs.me/2017/05/09/ambari-summary/ 2020-01-12 @@ -105,18 +108,18 @@ https://nicksxs.me/2016/07/13/swoole-websocket-test/ 2020-01-12 - - https://nicksxs.me/2015/06/22/invert-binary-tree/ - 2020-01-12 https://nicksxs.me/2016/10/12/summary-ranges-228/ 2020-01-12 - https://nicksxs.me/2015/01/04/Path-Sum/ + https://nicksxs.me/2015/06/22/invert-binary-tree/ 2020-01-12 https://nicksxs.me/2017/04/25/rabbitmq-tips/ 2020-01-12 + + https://nicksxs.me/2015/01/04/Path-Sum/ + 2020-01-12 https://nicksxs.me/2015/03/11/Number-Of-1-Bits/ 2020-01-12 diff --git a/categories/C/Mysql/index.html b/categories/C/Mysql/index.html new file mode 100644 index 0000000000..42cd22c11a --- /dev/null +++ b/categories/C/Mysql/index.html @@ -0,0 +1,583 @@ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + Category: Mysql | Nicksxs's Blog + + + + + + + + + + + + + + + + +
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    Powered by Hexo & NexT.Pisces +
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    What hurts more, the pain of hard work or the pain of regret?

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    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Tag: docker | Nicksxs's Blog + Tag: Docker | Nicksxs's Blog - - - - - - -${app_id.slice(0, 8).toLowerCase()}.api.lncldglobal.com`; - - if (api_server) { - fetchData(api_server); - } else { - fetch('https://app-router.leancloud.cn/2/route?appId=' + app_id) - .then(response => response.json()) - .then(({ api_server }) => { - fetchData('https://' + api_server); - }); - } - })(); - - - -
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    What hurts more, the pain of hard work or the pain of regret?

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    Powered by Hexo & NexT.Pisces +
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    +
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    What hurts more, the pain of hard work or the pain of regret?

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    Powered by Hexo & NexT.Pisces +
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