当前位置:网站首页>[MySQL learning notes 32] mvcc
[MySQL learning notes 32] mvcc
2022-07-06 07:19:00 【yqs_ two hundred and eighty-one million eight hundred and seven】
redo log Redo log
redo log It records the physical modification of the data page when the transaction is committed , It is used to achieve the persistence of transactions
The log is divided into two parts : Redo log buffer and redo log file , The former is in memory , The latter is on disk . After the transaction is committed, all modification information will be saved to the log file , Used to refresh dirty pages ( That is, uncommitted data ) Restore data usage when disk errors occur .
undo log Rollback log
MVCC
Implicit fields
Field name | meaning |
---|---|
DB_TRX_ID | Recently modified transactions ID, Record the transaction that inserted this record or last modified it ID |
DR_ROLL_PTR | rollback pointer , Record the last version of this record , Used for coordination undo log, Point to the previous version |
DB_ROW_ID | Hide primary key , If the table structure does not specify a primary key , Hidden primary keys will be automatically generated |
Version chain
readview
边栏推荐
- Go learning --- use reflection to judge whether the value is valid
- #systemverilog# 可综合模型的结构总结
- Uncaught TypeError: Cannot red propertites of undefined(reading ‘beforeEach‘)解决方案
- Hydra common commands
- LeetCode 78:子集
- [JDBC] quick start tutorial
- Uncaught typeerror: cannot red properties of undefined (reading 'beforeeach') solution
- Compile, connect -- notes-2
- 数字IC设计笔试题汇总(一)
- idea控制台彩色日志
猜你喜欢
Hydra common commands
LeetCode 78:子集
leetcode841. Keys and rooms (medium)
Oracle database 11gr2 uses TDE transparent data encryption to report an error ora28353. If you run to close the wallet, you will report an error ora28365. If you run to open the wallet, you will repor
word中如何删除某符号前面或后面所有的文字
数字IC设计笔试题汇总(一)
Go learning -- implementing generics based on reflection and empty interfaces
1091: two or three things in childhood (multi instance test)
变量的命名规则十二条
NFT on fingertips | evaluate ambire on G2, and have the opportunity to obtain limited edition collections
随机推荐
【MySQL学习笔记32】mvcc
杰理之AD 系列 MIDI 功能说明【篇】
【mysql学习笔记30】锁(非教程)
NFT on fingertips | evaluate ambire on G2, and have the opportunity to obtain limited edition collections
杰理之普通透传测试---做数传搭配 APP 通信【篇】
Supervisor usage document
navicat如何导入MySQL脚本
首发织梦百度推送插件全自动收录优化seo收录模块
ORACLE列转行--某字段按指定分隔符转多行
C - Inheritance - hidden method
OpenJudge NOI 2.1 1661:Bomb Game
杰理之BLE【篇】
What is the biggest problem that fresh e-commerce is difficult to do now
chrome查看页面fps
SSM学习
leetcode35. 搜索插入位置(简单,找插入位置,不同写法)
NiO programming introduction
Win10 64 bit Mitsubishi PLC software appears oleaut32 DLL access denied
The psychological process from autojs to ice fox intelligent assistance
Word delete the contents in brackets