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数据库期末复习

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Chapter 1 Introduction

Database Structure,Language,Users,Data Model

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Part 1 Relational Languages

Relational Model
SQL
Integrity and Security

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Part 2 Database Design

E_R Model
Relational-database Design

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Part 5 Data Storage and Indexing

Physical Storage Systems
Data Storage Structures
Indexing

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Part6 Querying Processing And Optimization

Querying Processing
Query Optimization

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Part7 Transaction Management

Transactions
Concurrency control
Recovery System

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关系代数

知识总结

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删除

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插入

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更新

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SQL

知识总结

create table

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常用数据类型:

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  • char(n):长度为n的定长字符串
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  • varchar(n):最大长度为n的变长字符串
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  • int:长整数
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  • numeric(p,d):定点数,小数点前p位,小数点后d位
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  • boolean:逻辑布尔值
    建表时考虑的完整性约束:
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  • 主键约束:primary key(ID)
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  • 外键约束:foreign key(dept_name) references department
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  • 检查约束:sex char(1) check(sex in(‘男’,’女’))
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  • 非空约束:name varchar(20) not null
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  • 默认值约束:sex char(1) default ‘男’
    补充:关系模型的完整性约束
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  1. 实体完整性约束(entity integrity)
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  3. 参照完整性约束(referential integrity)
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  5. 用户自定义的完整性约束

    drop table

    drop table r 删除表r

    alter table

    alter table r add A D 向表r中增加属性A,D为数据类型

    select


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    rename

    like

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    |500

    join

    默认的join为inner join

    view

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    order by

    group by


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    deletion

    insert

    update

    index

    grant/revoke


    role

    E-R图

    知识总结

    |500

    全参与/部分参与

    两条线的那端表示全参与

    弱实体集

    双方框表示弱实体集,弱实体集的部分键加虚下划线进行标识

    题型总结

    画E-R图

    将E-R图转换为关系模式

    实体集的转换

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  • 一个多值属性生成一个表
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  • 表中只写复合属性的细分属性
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  • 弱实体集中键+依赖集的主键构成弱实体集的主键

    联系集的转换

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  • 1对1->合并到任一边
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  • 1对n->用1的主键作为外键合并到n那一边
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  • 多对多->生成表:两个主键+联系集的属性
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关系范式

知识总结

函数依赖

当关系模式为R,其中 $\alpha \subseteq R$ 和 $\beta \subseteq R$。如果在 R 上成立函数依赖 $\alpha \rightarrow \beta$(α决定β,或β依赖α),则当对于 R 的任何合法关系 r(R) 时,只要关系中的任意两个元组 t1和 t2 在属性 $\alpha$ 上相同,它们在属性 $\beta$上也相同。

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  • 平凡依赖:平凡依赖是一种显而易见的依赖,它指的是一个属性或属性集总是依赖于自身的超集。例如,ID,name->ID;name->name
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  • 传递依赖:如果存在依赖 A→B 和 B→C,那么可以推导出传递依赖 A→C。
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  • 部分依赖:如果一个属性依赖于关键字的一部分,而不是整个关键字,那么就存在部分依赖。

    K是关系模式R的超键 <-> K$\rightarrow$R
    K是R的候选键 <-> K$\rightarrow$R且不存在α$\subseteq$K,α$\rightarrow$R(候选键具有最小性和唯一性)
    主属性:属于某个候选键的属性
    非主属性:不属于任何候选键的属性

    范式

    第一范式(1NF):关系模式中的每个属性都是原子性的,即不可再分。不能有复合属性或多值属性。
    第二范式(2NF):在1NF的基础上,要求表中的非主属性完全依赖于所有候选键
    第三范式(3NF):在2NF的基础上,要求表中的非主属性都不传递依赖于候选键
    巴斯·科德范式(BCNF):如果关系模式R是1NF,且每个属性都不部分依赖于候选键也不传递依赖于候选键,那么称R是BC范式。

    无损连接

    函数依赖保持

    题型总结

    求属性集闭包a+

    求函数依赖集的候选键

    step1 属性分类

    L:只出现在左边(能推出别人,但不能被别人推出,一定属于候选键)
    R:只出现在右边(只能被推出,一定不属于候选键)
    LR:左右都出现(可能属于候选键)
    N:未出现(不能被别人推出,一定属于候选键)

    Step2 求闭包

    假如L、N的闭包是整个集合,那么L、N就是候选键;否则,依次加上LR中的属性,求闭包,看是否是整个集合,是则为候选键。

    判断关系模式最高第几范式

    step1 写出候选键和非主属性

    step2 判断非主属性和候选键之间是否存在部分依赖

    存在则最高第一范式

    step3 判断非主属性和候选键之间是否存在传递依赖

    存在则最高第二范式

    计算正则覆盖/最小覆盖Fc

    step1 拆分右侧

    例如将A->BC拆分为A->B和A->C

    step2 去除自身求闭包

    若有AB->C,BC->E,AE->G,去除AB自身,求AB的闭包,假如包含C,则删除冗余依赖AB->C

    step3 左侧最小化

    若有ABC->D,观察左侧,判断A能否由BC推出,能则去掉左侧的A

    判断无损连接

    求R1与R2的交集X
    看是否满足X->R1或者X->R2,满足一个就是无损连接

    分解R为3NF,并保持无损连接和函数依赖

    step1 求正则覆盖Fc

    step2 观察Fc,划分集合,删除被另一集合包含的冗余集合

    step3 找出未在Fc中出现的属性,划分为一个集合

    step 4 假如候选键未出现在上述集合中,单独将候选键划分为一个集合

    索引

    知识总结

    聚集索引:索引顺序和文件顺序相同
    稠密索引:索引文件中出现了数据文件中所有的搜索键
    稀疏索引:索引文件中仅出现数据文件中部分的搜索键

    语法树

    知识总结

    题型总结

    构造语法树

    叶节点:关系
    非叶节点:各种关系代数操作
    从底向上执行

    优化语法树

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  1. 利用选择串接律,将选择操作分成单个独立;
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  3. 对于每个选择操作,尽可能移到靠近叶节点;
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  5. 对于每个投影操作,尽可能移到靠近叶节点或删除某些投影操作;
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  7. 将串接的多个选择和投影组合成一个;
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  9. 按照小关系先执行的原则,安排操作顺序;
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  11. 组合笛卡尔乘积和相继的操作为连接操作;
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  13. 对每个叶节点加必要的投影操作,消除对查询无用的属性;
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  15. 分组(考试不涉及)

    事务

    知识总结

    可恢复调度(recoverable schedule):如果Tj会读取一个由Ti写的数据,那么Tj应该在Ti之后提交。
    无级联调度(cascadeless schedule):不会发生级联回滚(因一个事务故障导致其它事务回滚),对每一对事务Ti和Tj,如果Tj会读取由Ti写的数据,那么Tj的读取操作应该发生在Ti提交之后。
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共享锁S:只能读
互斥锁X:能读能写
两阶段锁协议:事务在锁点前只能加锁,在锁点后只能解锁
strict two-phase locking protocol:互斥锁保持到最后再释放
rigorous two-phase locking protocol:所有锁保持到最后再释放

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冲突可串行化(serializable):若一个调度能通过调换非冲突操作等价于一个串行调度,则为冲突可串行化。
冲突可串行化判断方法:前驱图

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  1. Ti->Tj,代表Ti执行一条操作后,Tj会执行冲突操作
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  3. 若得到的前驱图无环,代表冲突可串行化
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  5. 根据无环的前驱图确认等价的串行顺序:选入度为0的事务,去掉该事务和边,再选入度为0的事务,以此类推

    题型总结

    判断可恢复调度/不可恢复调度

    比较两个冲突操作的提交时间

    判断级联调度/无级联调度

    比较读操作的时间写操作的提交时间

    根据日志写出变量的值

    根据日志写出ignore、undo、redo的事务

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操作系统期末复习

- +
- 数据库期末复习 + Linux开发环境及应用期末复习 - 数据库期末复习 + Linux开发环境及应用期末复习
- 大三上数据库期末复习 + 大三上Linux开发环境及应用期末复习
- 2024-01-04 + 2023-12-19 @@ -618,12 +618,16 @@

+ + 笔记 + + 期末复习 - - 数据库 + + Linux

@@ -806,7 +810,7 @@

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算法设计与分析期末复