Category:Database

  • Handwritten MyBatis framework

    Time:2022-12-6

    Native JDBC frame writing test source address Handwriting the Mybatis framework is more conducive to understanding the bottom layer of the framework, so as to know what it is and why it is. Native JDBC /** * Native jdbc writing method * * @author lipangpang * @date 2022/3/13 * @description */ public class JdbcDemo { […]

  • Apache Kyuubi & SeaTunnel Joint Meetup | Witness the Rise of Big Data in China!

    Time:2022-12-6

    For more than a decade, the Apache community has been a bellwether for big data technologies. Last year, 5 new projects from China entered the ASF project incubator, 3 of which were big data-related projects, which witnessed the rise of local big data. On March 12, 2022 (Saturday), the two cutting-edge communities of Apache Kyuubi […]

  • [Tutorial] Teach you how to build Hadoop stand-alone pseudo-cluster

    Time:2022-12-6

    Author: fantasy good source:Hang Seng LIGHT Cloud Community overview This article will build a stand-alone pseudo-cluster Hadoop service through a virtual machine to help you better learn and understand the operating principle of the Hadoop big data platform. Specific to every detail, it is convenient for novices to learn and understand. Environmental preparation Linux centos […]

  • Question: What are the format types of JSON?

    Time:2022-12-6

    JSON is currently the most popular data exchange format, for which we need to be very familiar with all aspects of its knowledge, this time let’s take a look at its format types. data exchange format basic type array type object nesting Case Practice basic type {“key” : value, “key” : “value”,…}, start with braces, […]

  • An efficient, stable and easy-to-use data integration framework — Principle and implementation of ChunJun class loading

    Time:2022-12-6

    1. Live introduction In the previous issues, we shared with you ChunJun’s data restoration, Hive transaction table and some content of the transmission module. In this issue, we will share with you the principle and implementation of ChunJun class loading. In this live broadcast, we will introduce the basic idea of ​​Java class loader to […]

  • Detailed explanation of Linux policy routing

    Time:2022-12-6

    overview In Linux, we usually useroutecommand to manage routing information. However, this command can only be used for the management of basic routing information. Facing the more powerful policy-based routing mechanism,routeThe order seems to be overwhelmed. In the traditional routing algorithm, routing can only be performed based on the destination address. However, if there are […]

  • Summary of 105 Motianlun “localization migration” dry goods documents (including TiDB, openGauss, Shangyun, etc.)

    Time:2022-12-6

    At present, domestic database products are in full bloom. With the advancement of policies, technology iterations and the gradual expansion of market demand, the localization of databases is accelerating. There are more and more financial, communication, manufacturing, Internet and other corporate institutions and government agencies. The business system has been migrated from foreign databases such […]

  • Xiao Peng: Things about Weibo databases (Interview with Turing)

    Time:2022-12-6

    For non-commercial reprints, please indicate the translator and source, and keep the original link of this article:http://www.ituring.com.cn/article/211461 Xiao Peng, technical manager of Weibo R&D Center, mainly responsible for business guarantee, performance optimization, architecture design, and surrounding automation system construction related to Weibo database (MySQL/Reids/HBase/Memcached). Experienced various stages of microblog database structural transformation, including service guarantee […]

  • Why is it faster to open the page for the second time? Five steps to understand the front-end cache and let the page fly

    Time:2022-12-6

    How can I make the first screen load faster? Why is it much faster to open the page for the second time? How to keep the data from being cleared after refreshing or closing the browser? The main reason is that some data is cached in the process of loading the page for the first […]

  • KunlunBase Guide Manual (4) Real-time Synchronization Data from Oracle

    Time:2022-12-6

    1. Environment and software requirements Oracle GoldenGate supports data replication between Oracle database and KunlunBase starting from 11.2.1.0.2. This document provides the basic configuration scheme of the data replication process, involving specific configurations of different operating systems and database versions, please refer to the official document. Software Requirements: Oracle GoldenGate for Oracle Oracle GoldenGate for […]

  • Case usage of SQL Server

    Time:2022-12-6

    definition Evaluates a list of conditions and returns one of several possible result expressions. expression type case has two formats: A simple case expression that determines the result by comparing the expression to a simple set of expressions. case search expression, which determines the result by evaluating a set of Boolean expressions. Both of these […]

  • superset performance optimization 1 – change the default data source sqlite to mysql for superset already in use

    Time:2022-12-6

    Already using the superset to change the default data source sqlite to mysql 1. Extract the sqlite db (due to the current use of docker needs to go to the host)docker cp CONTAINER_NAME:/var/lib/superset/superset.db /opt 2. Data exportThen use the navicat database tool to open the sqlite file and select the export wizard to save the […]