diff --git a/docs/notes/pics/26a7c9df-22f6-4df4-845a-745c053ab2e5.jpg b/docs/notes/pics/26a7c9df-22f6-4df4-845a-745c053ab2e5.jpg new file mode 100644 index 00000000..cf6ab009 Binary files /dev/null and b/docs/notes/pics/26a7c9df-22f6-4df4-845a-745c053ab2e5.jpg differ diff --git a/docs/notes/pics/2959e455-e6cb-4461-aeb3-e319fe5c41db.jpg b/docs/notes/pics/2959e455-e6cb-4461-aeb3-e319fe5c41db.jpg new file mode 100644 index 00000000..09ad339e Binary files /dev/null and b/docs/notes/pics/2959e455-e6cb-4461-aeb3-e319fe5c41db.jpg differ diff --git a/docs/notes/pics/43bf0957-0386-4c09-9ad7-e163c5b62559.jpg b/docs/notes/pics/43bf0957-0386-4c09-9ad7-e163c5b62559.jpg new file mode 100644 index 00000000..556c01dd Binary files /dev/null and b/docs/notes/pics/43bf0957-0386-4c09-9ad7-e163c5b62559.jpg differ diff --git a/docs/notes/pics/73846795-675b-496b-88b0-d44233fdcfba.jpg b/docs/notes/pics/73846795-675b-496b-88b0-d44233fdcfba.jpg new file mode 100644 index 00000000..b045287d Binary files /dev/null and b/docs/notes/pics/73846795-675b-496b-88b0-d44233fdcfba.jpg differ diff --git a/docs/notes/pics/8036ba3d-8de9-44aa-bf5d-1f8ca18ae89b.jpg b/docs/notes/pics/8036ba3d-8de9-44aa-bf5d-1f8ca18ae89b.jpg new file mode 100644 index 00000000..7491217d Binary files /dev/null and b/docs/notes/pics/8036ba3d-8de9-44aa-bf5d-1f8ca18ae89b.jpg differ diff --git a/docs/notes/pics/bab0fba6-38e4-45f7-b34d-3edaad43810f.jpg b/docs/notes/pics/bab0fba6-38e4-45f7-b34d-3edaad43810f.jpg new file mode 100644 index 00000000..c3815f20 Binary files /dev/null and b/docs/notes/pics/bab0fba6-38e4-45f7-b34d-3edaad43810f.jpg differ diff --git a/docs/notes/数据库系统原理.md b/docs/notes/数据库系统原理.md index 870111cc..2c829837 100644 --- a/docs/notes/数据库系统原理.md +++ b/docs/notes/数据库系统原理.md @@ -48,7 +48,7 @@ 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。 -

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## ACID @@ -81,7 +81,7 @@ - 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。 -

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## AUTOCOMMIT @@ -95,26 +95,26 @@ MySQL 默认采用自动提交模式。也就是说，如果不显式使用`STAR T1 和 T2 两个事务都对一个数据进行修改，T1 先修改，T2 随后修改，T2 的修改覆盖了 T1 的修改。 -

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## 读脏数据 T1 修改一个数据，T2 随后读取这个数据。如果 T1 撤销了这次修改，那么 T2 读取的数据是脏数据。 -

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## 不可重复读 T2 读取一个数据，T1 对该数据做了修改。如果 T2 再次读取这个数据，此时读取的结果和第一次读取的结果不同。 -

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## 幻影读 T1 读取某个范围的数据，T2 在这个范围内插入新的数据，T1 再次读取这个范围的数据，此时读取的结果和和第一次读取的结果不同。 -

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