Database Page Header ..... 5 4. Database Header Page — Type 0x01 ..... 7 5. Page Inventory Page — Type 0x02 ..... 14 6. Transaction Inventory Page — Type 0x03 ..... 16 7. Pointer Page — Type 0x04 0x04 ..... 18 8. Data Page — Type 0x05 ..... 21 8.1. Record Header ..... 22 8.2. Record Data ..... 24 8.3. A Worked Example ..... 24 8.4. Examining The Data ..... 28 8.4.1. Compressed Data 8.4.3. Null ..... 31 8.4.4. NULL status bitmap ..... 31 9. Index Root Page — Type 0x06 ..... 36 10. Index B-Tree Page — Type 0x07 — YOU ARE HERE ..... 41 10.1. B-Tree Header ..... 41 10.2. Index

# Java 应用与开发 JSP (Java Server Page) 王晓东 wangxiaodong@ouc.edu.cn 中国海洋大学 December 3, 2018   ## 大纲 ## 接下来… ## JSP 基本概念 JSP(Java Server Page)，即 Java 服务器页面。 JSP 是 Servlet 的扩展。 JSP 将使用 Java 类编写动态 Web 组件的方式转变为使用文本编写（采用标记型语法和过程性语法混合），降低了开发的难度。 指令不会产生任何的输出到当前输出流中。 ## JSP 指令 page 指令，用于定义 JSP 页面级的其他元素特征。 include 指令，用于嵌入另一个文本文件的内容到本页面。 ▶ taglib 指令，用于引入第三方 JSP 扩展标记类库。 ## JSP 指令的语法 <%@ 指令名 属性名="值" 属性名="值" %> ## page 指令 page 指令定义应用于整个页面的属性。

Outline • 事务实现原理和Write Ahead Logging(WAL) • 分布式事务和两阶段提交的原理 Greenplum两阶段提交协议的实现 Greenplum两阶段提交协议的优化 ## 事务的属性:ACID |属性|含义|数据库系统的实现| |---|---|---| |Atomic原子性|事务中的操作要么全部正确执行，要么完全不执行。|Write Ahead Logging，分布式事务：两阶段提交协议| Concurrency Control、两阶段加锁（Two Phase Locking，2PL）、乐观并发控制（OCC）| |Durability持久性|一个事务在提交之后，该事务对数据库的改变是持久的。|Write Ahead Logging + 存储管理| ## Disk-Oriented DBMS Components  Non-Volatile Storage dirty bit reference count input(page) output(page) • pin(page) • unpin(page) ## 缓冲区管理策略Buffer Management Policy ## ■ Force / No-Force Force: 事务提交时，所修改的页面必须强制刷回到持久存储中

Использование индексов, если есть. • Параметры репликации данных. 1 Семейство MergeTree 2 Семейство Log 3 Движки для интеграции 4 Специализированные движки ## Возможности для интеграции с PostgreSQL number FROM numbers(10) ## Репликация данных из PostgreSQL в ClickHouse Движок таблиц для Read/Write репликации Движок баз данных для репликации ![Image](/uploads/documents/8/6/a/3/86a3407a8e7

Viewer (nbviewer). This service loads the notebook document from the URL and renders it as a static web page. The results may thus be shared with a colleague, or as a public blog post, without other users needing a web browser to the URL of the web application (by default, http://127.0.0.1:8888). The landing page of the Jupyter notebook web application, the dashboard, shows the notebooks currently available in empty code cell. notebook name: The name of the notebook document is displayed at the top of the page, next to the IP $$ y $$ : Notebook logo. This name reflects the name of the .ipynb notebook document

Disconnect from Database Connection Types Transactions Auto and Manual Commit Modes Transaction Log Pending transactions Database drivers Mock Data generation Data export/import Data migration Clickhouse ## Troubleshooting Command-Line Reset UI settings Reset workspace Posting issues Log files Thread dump ## Admin Guide Managing connections Managing drivers Windows Silent Install restart. To open the Query Manager, do one of the following: • Click the arrow next to the Transaction Log button in the toolbar and then click Query Manager on the dropdown menu: ![Image](/uploads/docume

file and default title block ..... 3 Output file ..... 3 Theory of operations ..... 4 Basic page layout items properties: ..... 4 Coordinates definition ..... 4 Reference corners and coordinates: Format symbols: ..... 8 Multi-line texts: ..... 10 Multi-line texts in Page Setup dialog: ..... 11 Constraints ..... 12 Page 1 constraint ..... 12 Text full size constraint ..... 13 Invoking PI_Editor Pl_Editor is a page layout editor tool to create custom title blocks, and frame references. The title block, associated to frame references, and other graphic items (logos) is called here a page layout. Basic

file and default title block ..... 3 Output file ..... 3 Theory of operations ..... 4 Basic page layout items properties: ..... 4 Coordinates definition ..... 4 Reference corners and coordinates: Format symbols: ..... 8 Multi-line texts: ..... 10 Multi-line texts in Page Setup dialog: ..... 11 Constraints ..... 12 Page 1 constraint ..... 12 Text full size constraint ..... 13 Invoking PI_Editor Pl_Editor is a page layout editor tool to create custom title blocks, and frame references. The title block, associated to frame references, and other graphic items (logos) is called here a page layout. Basic

Disconnect from Database Connection Types Transactions Auto and Manual Commit Modes Transaction Log Pending transactions Database drivers Tasks Data export/import Data migration Database backup/restore control, etc Troubleshooting Command Line Reset UI settings Reset workspace Posting issues Log files JDBC trace Thread dump Admin Guide Managing connections Managing drivers Windows restart. To open the Query Manager, do one of the following: • Click the arrow next to the Transaction Log button in the toolbar and then click Query Manager on the dropdown menu: ![Image](/uploads/docume

WHAT IS JITTING? - INSTEAD OF AHEAD-OF-TIME (AOT), AKA "THE NORM": IT'S LIKE THE APPLICATION (/LIBRARY) IS THE COMPILER... ## WHAT IS JITTING? - INSTEAD OF AHEAD-OF-TIME (AOT), AKA "THE COMPILER... - JUST-IN-TIME (JIT) IS COMPILATION AT THE POINT OF NEED ## WHAT IS JITTING? - INSTEAD OF AHEAD-OF-TIME (AOT), AKA "THE NORM": IT'S LIKE THE APPLICATION (/LIBRARY) IS THE COMPILER.. SECURITY BREACH SQL Injection Name: or 1=1-- Password: Log In ## CPP INJECTION / SECURITY BREACH SQL Injection Name: or 1=1-- Password: Log In SELECT * FROM Users WHERE Name=' or 1==1--'