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ProxySQL cluster Experimental environment informationMySQL master-slave information IP 1 role 188.188.0.68 Node1 188.188.0.69 Node2 188.188.0.70 Node3 ProxySQL service node IP 1 role 188.188.0.68 Node 68 188.188.0.71 Node 71 ProxySQL version: 2.0.3-29-g00f26d5 1, ProxySQL service installation Install the same version of P ...

13. Clickhouse support for proxysql configuration Note: during the writing time of the article from April 201904 to may 201905, subsequent official updates in github were not written ~~ClickHouse Support 1, Preface ProxySQL support for ClickHouse is still in the experimental phase and may change. 1. How to enable support for ...

1, Network communication protocol 1. Concept:         Through computer network, multiple computers can be connected. Computers in the same network need to abide by certain rules when connecting and communicating. In computer network, these rules of connection and communication are called network communicati ...

The where clause is used to find records from tables or temporary datasets that meet the specified conditions, and can be used for conditions in select, update, and delete statements. 1, Generate test data Use the following SQL to create the super girl basic information table (t? Girl) and insert some test data. create table T_GIRL ( id ...

Preface With the development of blockchain technology, more and more enterprises and individuals begin to combine blockchain with their own business. The unique advantages of blockchain, such as transparent and tamper proof data, can bring convenience to business. But at the same time, there are some hidden dangers. The data is open and transp ...

To facilitate the test, the Demo code is given first: mybatis-oracle-config.xml 1 <?xml version="1.0" encoding="UTF-8"?> 2 <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" 3 "http://mybatis.org/dtd/mybatis-3-config.dtd"> 4 5 <configuration> 6 <properties> 7 <property nam ...

This article mainly talks about the functions commonly used in Oracle, as well as the knowledge of type conversion. Note: date type is troublesome, but date format is indispensable in practical application. Single-Row Functions Single line function: only one parameter input and only one result output --1,Study lower/upper/initcap Function ...

In order to facilitate SEO search, first of all, post the error content Different versions of Oracle drivers will report different errors 1 <dependency> 2 <groupId>com.oracle</groupId> 3 <artifactId>ojdbc6</artifactId> 4 <version>1.0</version> 5 </dependency> The error is reported as ...

uncategorized SQLException; SQL state [99999]; error code [17004]; invalid column type Error phenomenon Invalid column type: getTimestamp not implemented for class oracle.jdbc.driver.T4CNumberAccessor ; uncategorized SQLException; SQL state [99999]; error code [17004]; Invalid column type: getTimestamp not implemented for class oracle.jdbc.driv ...

Use of wrapper Gradle Wrapper is the recommended usage of gradle. This article will illustrate how to use it with specific examples. Gradle Wrapper The Gradle Wrapper is actually a script, which can be used to download and use the specified version of gradle. It can be downloaded before use as required, effectively avoiding environment consiste ...