原创 record lock、gap lock、next-key lock 和事務隔離級別例子
目錄一、查看、設置mysql 事務隔離級別二、Row-level lockingPre Check Before Read Locking1.LOCK IN SHARE MODE2.FOR UPDATE三、gap lock1.Ph
2020-06-23 03:04:10
原创 JavaScript與DOM關係、JavaScript+DOM能做什麼
一、JavaScript與DOM關係 DOM是HTML和XML文檔的編程接口。它定義了文檔的邏輯結構和對文檔訪問操作的方法。具體而言，編程人員可以利用DOM create和build 文檔、導航（navigate）結構、操作（增、刪、改）
2020-05-31 08:11:06
原创 MySQL InnoDB MVCC實現
目錄一、MVCC概述二、Consistent Nonlocking Reads、Locking Reads1.Consistent Nonlocking Reads2.Locking Reads三、Innodb會保存任何改變的副本
2020-04-29 01:29:08
原创 行鎖、事務隔離級別
一、查看、設置mysql 事務隔離級別 //展示事務隔離級別 show global variables like '%isolation%'; //修改事務隔離級別 set global transaction_isolatio
2020-04-25 11:06:57
原创 慢索引及解決方法
An index lookup requires three steps: (1) the tree traversal; (2) following the leaf node chain; (3) fetching the t
2020-04-22 19:06:11
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原创 InnoDB 索引頁物理結構和邏輯結構
一、The physical structure of InnoDB index pages Every index page has an overall structure as follows: InnoDB’s data
2020-04-21 07:24:13
原创 try-catch-finally組合情況、執行過程字節碼解讀
一、Control flow in try-catch clause OR try-catch-finally clause 情況1：Exception occurs in try block and handled in catch
2020-04-21 07:24:13
原创 訪問硬盤數據庫過程、建立索引的好處
一、硬盤結構及工作過程 磁頭（head）：從上到下從0開始編號 磁道（track）：同心圓，編號從外向內由0開始編號 柱面（Cylinder）：所有盤面的同一編號在幾何上構成一個圓柱 扇區（sector）：每個磁道被劃分成N個弧段，每
2020-04-21 07:24:13
原创 throw、throws、rethrow自定義異常類
In Java exception handling： throw keyword is used to explicitly throw an exception from a method or constructor. throw
2020-04-21 07:24:13
原创 java序列化概述、序列化原因、如何序列化、明確serialVersionUID的必要性、繼承關係中序列化表現
一、Serialization、Deserialization Serialization is a mechanism of converting the state of an object into a byte strea
2020-04-15 06:58:03
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原创 Java IO Stream概述
一、What are the Streams In computer science Streams are defined as the ordered sequence of data elements. Provide
2020-04-15 06:58:03
原创 ArrayList、LinkedList、Vector
一、ArrayList ArrayList internally uses a dynamic array to store the elements. 1. Size And Capacity Size is the numbe
2020-04-05 18:11:28
原创 queue（Array、LinkedList實現）、Double Ended Queue
Queue : A list or collection with the restriction that insertion can be performed at one end(rear) and deletion can
2020-04-05 18:11:28
原创 Read / Write Locks in Java（未完）
A read / write lock is more sophisticated lock than the Lock implementations shown in the text Locks in Java. Imagi
2020-03-30 20:00:51
原创 Compare and Swap 、Anatomy of a Synchronizer
一、Compare and Swap Compare and swap is a technique used when designing concurrent algorithms. Basically, compare an
2020-03-30 20:00:51