Tag:Actuator

  • Seven steps to mastering Apache spark 2.0 (1)

    Time:2021-2-23

    Everyone talks about it hereSparkIn the age of, decimal also thinks it is necessary to publish technical articles on spark to help you understand and master spark from entry to proficient, from concept to programming, and deeply experience its charm:)Spark, here we go! 1、 Why spark First of all, spark is the most effective open […]

  • How is an SQL query executed?

    Time:2021-2-21

    What parts does MySQL have? Connectors: Manage Connections, verify permissions. Analyzer: lexical analysis, grammatical analysis. Optimizer: execution plan generation, index selection. Executor: operate the storage engine and return the result. Storage engine: store data and provide read-write interface. Connector The first step is to connect to the MySQL database, which is to connect to the […]

  • Analysis of MySQL infrastructure

    Time:2021-2-17

    The article has been hosted to GitHub, you can go to GitHub to check and read, welcome to star! MySQL infrastructure 1、 Introduction When we learn mysql, the first step is to understand and install the MySQL client, and then use Mysql to do a series of database operations. But what we often ignore is […]

  • Complete solution of mybatis series (6): how many of the most hard core API of mybatis do you know?

    Time:2021-2-12

    Cover: Luo XiaoxiAuthor: Pan Pan The big epidemic in 2020 will tear the world into pieces. Today, people are still in a panic. I’m glad to be in this stable country, Get a stable job at the same time. · A word often used by Dongjia:Late autumn mentality 。 Don’t follow the trend or make […]

  • The execution flow of a query statement

    Time:2021-2-9

    Execution of an update statement: This article comes from the experience of reading “45 lectures on MySQL” 1. ConnectorResponsible for managing the connection session with the client and obtaining the permission of the connecting user 2. AnalyzerResponsible for lexical analysis, syntax analysis, generate commands to be executed 3. OptimizerGenerate the execution plan, calculate the time […]

  • Execution flow of an update statement

    Time:2021-2-8

    Update process MySQL update also goes through the query process first. Unlike the query process, the update process also involves two important log modules, redo log and bin log. redo log InnoDB’s redo log is of a fixed size. For example, it can be configured as a group of four files, and the size of […]

  • Big update coming! Wondertrader new version v0.4.0 released

    Time:2021-1-22

    Today (July 6, 2020) wondertrader released its latest version, withTwo major updates。 The update of v0.4.0 is as follows: Add a new oneStock selection scheduling engine, which is used to schedule the stock selection strategy of the application layer. After getting the target combination, it provides automatic execution service. For the time being, it only […]

  • Depth analysis: handwritten a promise source code

    Time:2020-12-31

    catalog 1、 Implementation of promise core logic 2、 Add asynchronous logic to promise class 3、 Implement the then method to call multiple times and add multiple processing functions 4、 Realizing chain call of then method 5、 Identifying the self return of promise object by chain call of then method 6、 Catch error and then chain […]

  • Do you know how an SQL statement is executed?

    Time:2020-12-25

    Link to the original text:https://time.geekbang.org/col… Server layer Connector The connector is responsible for communicating with the clientEstablishing a connection、Get permission、Maintain connection、Manage Connections。 mysql -h$ip -P$port -u$user -p After entering the command, you need to enter the password in the interactive dialogue. Although the password can be directly followed by-pThe following is written on the command […]

  • 111

    Time:2020-12-25

    Link to the original text:https://time.geekbang.org/col… Server layer Connector The connector is responsible for communicating with the clientEstablishing a connection、Get permission、Maintain connection、Manage Connections。 mysql -h$ip -P$port -u$user -p After entering the command, you need to enter the password in the interactive dialogue. Although the password can be directly followed by-pThe following is written on the command […]

  • Write a promise

    Time:2020-12-24

    First of all, we need to determine several characteristics of promise Promise is a class. When executing this class, an actuator needs to be passed in, and the actuator will execute immediately Promise has three states: successful, fulfilled, rejected, pending (pending = > fulfilled pending = > rejected). Once the status is determined, it cannot […]

  • Hive Learn Part01

    Time:2020-12-9

    Hive learn Part 1 Chap 1 Basics Key points of this chapter: Preliminary understanding of Hadoop ecosystem Preliminary understanding of hive architecture 1-1 Hive Preface Hadoop introduction Hadoop ecosystem is a solution to deal with large data sets. Hadoop implements the computing model MapReduce, which can divide the computing task into multiple processing units. Under […]