SQL ite3 database C language simple operation basic data search (3)

SQL ite3 database C language simple operation basic data search (3) Overview: the creation, addition, deletion, and modification of sqlite3 database have all been mentioned. Today, it is the search of the database and the application of the core of database comparison. If the previous API is used for execution, because there is a return value ...

Posted by csj16 on Thu, 30 Apr 2020 00:17:15 -0700

ProxySQL cluster configuration

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 ...

Posted by rbarnett on Wed, 29 Apr 2020 03:26:43 -0700

Using ProxySQL to realize MGR multi main mode load balancing

MGR multi main mode configuration load balancing Experimental environment informationMySQL master-slave information IP role 188.188.0.68 Node1 188.188.0.69 Node2 188.188.0.70 Node3 ProxySQL version: 2.0.3-29-g00f26d5 >>>Server and user configuration<<< 1. Add backend database server Admin> SELECT * FROM mysql_s ...

Posted by Ferenc on Wed, 29 Apr 2020 02:42:27 -0700

ProxySQL official file translation

14_ProxySQL_Configuration Note: during the writing time of the article from April 201904 to may 201905, subsequent official updates in github were not written ~~How to configure proxysql in the simplest way This simple HOWTO describes how to configure some components of ProxySQL step by step. Note, however, that this is not a complet ...

Posted by sri2002 on Wed, 29 Apr 2020 00:17:06 -0700

oracle data source using weblogic

1. Generate the wlfullclient.jar required by the data source wlfullclient.jar generation method Enter weblogic's installation directory For example E:\tools\weblogic\wls12213\wlserver\server\lib  Operation java -jar wljarbuilder.jar You can generate the wlfullclient.jar file 2. weblogic configuration data source Basical ...

Posted by Sonic_Rage on Tue, 28 Apr 2020 08:44:21 -0700

Lesson 02: Flink starter WordCount and SQL implementation

In this lesson, we mainly introduce the entry program of Flink and the implementation of SQL form. In the last lesson, we have explained Flink's common application scenarios and architecture model design. In this lesson, we will start from a simple WordCount case and implement it in SQL mode at the same time, laying a solid foundation for the l ...

Posted by scoppc on Tue, 28 Apr 2020 03:13:19 -0700

Five ways to add new columns in the PySpark data box

Too much data is being generated every day. Although sometimes we can use tools such as Rapids or parallelism to manage big data, Spark is a good tool if you use TB level data. Although this article explains how to use RDD and basic Dataframe operations, I missed a lot when using PySpark Dataframes. Only when I need more functions can I read an ...

Posted by Journey44 on Tue, 28 Apr 2020 02:02:59 -0700

High concurrency scenario - Request merging uncover HystrixCollapser - asynchronous implementation with Queue and thread pool

background In the high concurrency scenario of the Internet, there will be a lot of requests, but the database connection pool is relatively small, or the CPU pressure and processing logic need to be reduced. It is necessary to change a single query to batch query multiple and return. For example, in Alipay, query "personal information&quo ...

Posted by joebudden on Tue, 28 Apr 2020 00:59:13 -0700

System Library_03_stats Library for ProxySQL Official Translation_u 09_ProxySQL Configuration

System Library _03_stats Library for 09_ProxySQL Configuration Note: Subsequent official updates to github were not written between 201904 and 201905~~Statistics] Stats library [The stats database] This database contains indicators for data collection of ProxySQL's internal capabilities.Here, you'll find information about how often certain cou ...

Posted by Matty999555 on Mon, 27 Apr 2020 10:21:14 -0700

What are Python's sacred honey operations?Attached Code

Someone said,'Python can do everything from nurturing sisters to dressing up x, except it can't have children!Anything will do!" Download video?I use Python; Play a jump?I jumped to 4999 with Python; Sister?Still using Python; Grab red bags for train tickets?Yes, it's Python. Even if I'm sorting out files, I'll use Python... Here are so ...

Posted by Lonepig on Sun, 26 Apr 2020 09:40:30 -0700