Case 12. shell multithreaded backup database

The shell script is multithreaded, which is somewhat difficult to understand because it is implemented with named pipes. Multithreading means that what was originally done by one process is now done by multiple threads. If a process needs 10 hours to complete something, now allocate 10 threads, divide them up, and then do it at the same time, ...

Added by neh on Tue, 13 Aug 2019 07:21:20 +0300

[offer-04] Binary Tree Reconstruction 2010 805/02

Rebuilding binary tree Examination Points: Trees Time limit: 1 second Space limitation: 32768K Enter the results of the pre-order and middle-order traversals of a binary tree, and rebuild the binary tree. It is assumed that the results of the input preamble traversal and the intermediate order traver ...

Added by JustinB on Tue, 13 Aug 2019 06:33:23 +0300

Android Month 2_Day9_Sqltie database

Android Month 2_Day9_Sqltie database Introduction to SQLite database Database usage and two core classes First, SQLiteOpenHelper II. SQLiteDatabase Batch processing of data using transactions Introduction to SQLite database 1. Lightweight database integrated in Android system 2. Characteristic ...

Added by Arnerd on Mon, 12 Aug 2019 16:01:54 +0300

MHA Cluster Management

Environmental Science: 192.168.205.37: as MHA server 192.168.205.47: as Master server 192.168.205.57: as Slave1 server192.168.205.67: as Slave2 server Edition: OS: centos 7 1810 with mini install mariadb-server 5.5.60mha4mysql-manager-0.56-0.el6.noarch.rpm mha4mysql-node-0.56-0.el6.noarch.rpm Purpose: MHA uses a program written in perl scrip ...

Added by Daniello on Mon, 12 Aug 2019 12:43:01 +0300

Concurrency Control via context for Go Translations

Author: Sameer Ajmani | Address: blog.golang.org/context Translator's Preface The translation of the second official blog post is mainly about the context package for Go Concurrency Control. Overall, I think Previous It is the foundation and core of Go concurrency.context is a set of easy-to-use libraries developed for goroutine control on the ...

Added by phenley on Mon, 12 Aug 2019 06:14:02 +0300

Use of triggers in Mysql

1. Triggers: In the bank deposit and withdrawal business, each time a user accesses a loan, the system needs to modify the balance of the corresponding account, and it also needs to automatically record this operation (generate transaction details), while the above operation is performed on two tabl ...

Added by Grego on Mon, 12 Aug 2019 04:42:04 +0300

Redis Introduction, Installation, and Data Structure

Introduction to Redis What is Redis Redis is an open source (BSD licensed) high-performance key-value memory database developed in C that can be used as a database, cache, and messaging middleware.It is a NoSQL (NOT-Only Sql, generically referred to as a non-relational database) database Excellent performance, data in memory, very fast read a ...

Added by davey10101 on Sun, 11 Aug 2019 22:57:35 +0300

Encrypt SpringBoot configuration file using Jasypt

Preface With the security situation getting worse these days, I realized that there is a bug in our project that we often ignore: the security of configuration information in our project's configuration file, especially the security of user names and passwords for database connections.So here we need to encrypt the user name and password of th ...

Added by dave420 on Sun, 11 Aug 2019 07:29:04 +0300

Hibernate 5 Introduction

Hibernate 5 Introduction Articles Catalogue Hibernate 5 Introduction Preface Environmental description Configuration process 1. Database creation 2. Project Construction 3. Configure hibernate.cfg.xml 4. Mapping Relations 4.1 xml Mapping 4.2 Annotation Mapping 5. Create SessionFactory 6. Unit t ...

Added by freedmania on Sat, 10 Aug 2019 17:22:30 +0300

Go-Error, defer, panic and recover y

6.1. Error The error interface under builtin package is used as error type in Go language Errors in the Go language are used as return values of methods/functions Customize error types //Learn_Go/main.go package main import ( "errors" "fmt" ) func demo(i,k int) (r int, e error) { if k == 0 { e = errors.New("The divisor c ...

Added by rh-penguin on Sat, 10 Aug 2019 10:50:44 +0300