Programmer Group

Preface This article requires the reader to be familiar with the general garbage collection principles built into the JVM. Heap memory is divided into Eden, Survivor and Tenured/Old spaces. Generation assumption and other different GC algorithms are beyond the scope of this paper. Minor GC Reclaiming memory from younger generation spaces, i ...

First, MongoDB is ready on the server running the fragmentation. We need to plan: A configuration server is used to store fragmentation information and coordinate data storage. Several piecewise servers are used to save the data itself. A broker server, used to perform fragmentation operations, but also the access entrance of the client. 1. S ...

I. Use of ActionBar Action Bar is the application of the top rectangular bar, the content is generally app icon, app name, menu buttons, tab navigation, etc. 1. Display and hide ActionBar xml method: Setting the theme attribute of application or activity in manifest can display and hide (theme with NoAction Bar) java method: first, getSupportAc ...

ABSTRACT: This paper mainly studied the method of using DDL statements to operate custom functions. Understanding custom functions What is it? Custom functions are procedural database objects that are very similar to stored procedures. Like stored procedures, it is a code fragment consisting of SQL statements and procedural statements, and c ...

This paper will focus on the analysis of Elastic Job's fragmentation mechanism: Elastic Job fragmentation mechanism: When Elastic Job starts, it first starts the listener that needs to be re-fragmented.See the code: ListenerManager startAllListeners {...; shardingListenerManager. start ();...}. Before the task is executed, fragmentation inform ...

I. Preface From today on, we will start our web development. The previous article used SpringBoot Take-off Series - Build Environment with idea (2) We have explained how to develop, of course, this is the beginning of the construction, and then we will start to develop in detail, including the use of various starters in spring boot, the real f ...

IF Tags Problems arising from the non-use of if tags Dynamic splicing sql is realized by various tag methods provided by mybatis. Demand: user enquiry based on gender and name Query sql: SELECT id, username, birthday, sex, address FROM user WHERE sex = 1 AND username LIKE'% Liu%' <!-- Query users b ...

Feeling will always do one or two less steps, resulting in slow change, later can not remember to change the contrast. # For example, add a field 1. Add < input > to the page <input type="file" id="f" name="imageFile" οnchange="uploadImage(this,'img','form-article-add');" style="display: ...

As shown in the figure above, the function of this shader is to melt the box bit by bit and then gradually disappear. This shader function is mainly divided into two parts, the first part is disappearance, the second part is edge shading, and the third part is Custom Shadow Projection Pass. The impleme ...

Preface In our practical work, we often encounter the insertion of thousands or even tens of thousands of data into a page. Obviously, if we render tens of thousands of data at the same time, the page will definitely get stuck. At this time, we nee ...