StarMirror/CS-Notes
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

auto commit

Browse Source
This commit is contained in:
CyC2018 2019-12-07 20:58:43 +08:00
parent d7920b50bd
commit bacf789b73
8 changed files with 8 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
docs/notes/数据库系统原理.md
View File

@ -47,7 +47,7 @@
事务指的是满足 ACID 特性的一组操作，可以通过 Commit 提交一个事务，也可以使用 Rollback 进行回滚。
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20191207175048914.png"/> </div><br>
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20191207205825456.png"/> </div><br>
## ACID
@ -80,7 +80,7 @@
- 在并发的情况下，多个事务并行执行，事务不仅要满足原子性，还需要满足隔离性，才能满足一致性。
- 事务满足持久化是为了能应对数据库崩溃的情况。
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20191207175109320.png"/> </div><br>
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20191207205737391.png"/> </div><br>
## AUTOCOMMIT
@ -94,13 +94,13 @@ MySQL 默认采用自动提交模式。也就是说，如果不显式使用`STAR
T<sub>1</sub> 和 T<sub>2</sub> 两个事务都对一个数据进行修改，T<sub>1</sub> 先修改，T<sub>2</sub> 随后修改，T<sub>2</sub> 的修改覆盖了 T<sub>1</sub> 的修改。
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/75184b58-c627-4edc-8dcf-605762ebb733.png" width="320px"> </div><br>
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20191207205105044.png"/> </div><br>
## 读脏数据
T<sub>1</sub> 修改一个数据，T<sub>2</sub> 随后读取这个数据。如果 T<sub>1</sub> 撤销了这次修改，那么 T<sub>2</sub> 读取的数据是脏数据。
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/af0e94d9-502d-4531-938f-d46dd29de52d.png" width="360px"> </div><br>
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20191207205339747.png"/> </div><br>
## 不可重复读

BIN
notes/pics/image-20191207180652772.png Normal file
View File

Binary file not shown.
Side by Side

After

Width:  |  Height:  |  Size: 47 KiB

BIN
notes/pics/image-20191207180710529.png Normal file
View File

Binary file not shown.
Side by Side

After

Width:  |  Height:  |  Size: 47 KiB

BIN
notes/pics/image-20191207205105044.png Normal file
View File

Binary file not shown.
Side by Side

After

Width:  |  Height:  |  Size: 47 KiB

BIN
notes/pics/image-20191207205339747.png Normal file
View File

Binary file not shown.
Side by Side

After

Width:  |  Height:  |  Size: 54 KiB

BIN
notes/pics/image-20191207205737391.png Normal file
View File

Binary file not shown.
Side by Side

After

Width:  |  Height:  |  Size: 44 KiB

BIN
notes/pics/image-20191207205825456.png Normal file
View File

Binary file not shown.
Side by Side

After

Width:  |  Height:  |  Size: 46 KiB

8
notes/数据库系统原理.md
View File

@ -47,7 +47,7 @@
事务指的是满足 ACID 特性的一组操作，可以通过 Commit 提交一个事务，也可以使用 Rollback 进行回滚。
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20191207175048914.png"/> </div><br>
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20191207205825456.png"/> </div><br>
## ACID
@ -80,7 +80,7 @@
- 在并发的情况下，多个事务并行执行，事务不仅要满足原子性，还需要满足隔离性，才能满足一致性。
- 事务满足持久化是为了能应对数据库崩溃的情况。
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20191207175109320.png"/> </div><br>
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20191207205737391.png"/> </div><br>
## AUTOCOMMIT
@ -94,13 +94,13 @@ MySQL 默认采用自动提交模式。也就是说，如果不显式使用`STAR
T<sub>1</sub> 和 T<sub>2</sub> 两个事务都对一个数据进行修改，T<sub>1</sub> 先修改，T<sub>2</sub> 随后修改，T<sub>2</sub> 的修改覆盖了 T<sub>1</sub> 的修改。
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/75184b58-c627-4edc-8dcf-605762ebb733.png" width="320px"> </div><br>
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20191207205105044.png"/> </div><br>
## 读脏数据
T<sub>1</sub> 修改一个数据，T<sub>2</sub> 随后读取这个数据。如果 T<sub>1</sub> 撤销了这次修改，那么 T<sub>2</sub> 读取的数据是脏数据。
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/af0e94d9-502d-4531-938f-d46dd29de52d.png" width="360px"> </div><br>
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20191207205339747.png"/> </div><br>
## 不可重复读