Programming VIP

1. Master slave replication 1.1 INTRODUCTION What is master-slave replication? After the host data is updated, it is automatically synchronized to the Master / Slave mechanism of the standby machine according to the configuration and policy. The Master is mainly write and the Slave is mainly read. purpose Read write separation, perf ...

Chapter 1 Introduction to SQL1.1. What is sqlSQL: Structure Query Language. (Structured Query Language), operate the database through SQL (operation database, operation table, operation data)SQL was determined as the American Standard of relational database language by American National Bureau of standards (ANSI), and later adopted as the inte ...

oracle knowledge points summary Indexes Create index CREATE [UNIQUE] | [BITMAP] INDEX index_name --unique Represents a unique index ON table_name([column1 [ASC|DESC],column2 --bitmap，create bitmap index [ASC|DESC],...] | [express]) [TABLESPACE tablespace_name] [PCTFREE n1] --Specifies that the index has ...

General operations in traditional JDBC programming: 1. Register the database driver class and specify the URL address, database user name, password and other connection information of the database2. Open database connection through DriverManager3. Create a Statement object through a database connection.4. Execute the SQL statement through the ...

preface Students who have read the Alibaba Java development manual should notice that there is a mandatory specification in the MySQL index specification: This article will analyze why the index on varchar must specify the index length? index structure To understand the reason, we must first have a certain understanding of the index struc ...

3.3,SqlSessionFactory SqlSessionFactory has multiple methods to create SqlSession instances, including the following two: SqlSessionFactory.openSession: a transaction will be started by default, but the transaction will not be submitted automatically, which means that the transaction needs to be submitted manually before the update operati ...

Welcome to the MySQL technical articles shared by the great SQL community. If you have any questions or want to learn, you can leave a message in the comment area below. After seeing it, you will answer itPercona XtraBackup feature descriptionPercona Xtrabackup backup recovery permission restrictionsCreate backup users, configuration parameters ...

Troubleshoot SQL with SAP HANA Database Explorer The debugger can be used to help find problems in procedures, functions, or anonymous blocks. The following steps demonstrate how to use the debugger to debug the process. Select a stored procedure, right-click it, and select Open for debugging: From the debugger attach Options dialog box, e ...

1, Database operation =========================================================================== Note that each time the client inputs a statement, it must be added; 1.1 display database show databases; 1.2 create database --format create database [Database name]; create database test; Note: you cannot create a database ...

} else { /** * The following code shows that only one of the three attributes of url resource class can be selected, otherwise an error will be reported */ throw new BuilderException("A mapper element may only specify a url, resource or class, but ...