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Manually deploy ob triple-copy cluster 1. IP Address and Machine Planning Machine os:centos 7.5 8c12g IP Addresshost nameMachine RoleExplain192.168.32.111obce01observer+obproxy192.168.32.112obce02observer192.168.32.113obce03observer+obproxy192.168.32.114obce04observerAdd, Expand192.168.32.115obce05observer+obproxyAdd, Expand Note: The machin ...

1, Database localization backgroundracle is still the greatest database so far. The Oracle versions we have seen or heard of in our generation are 8i and 9i. The release dates are 1998 and 2001. The earliest release date of Oracle can be traced back to the 1960s and 1970s. At that time, oracle was called RSi (Relational Software, Inc). Oracle d ...

This article describes how to use benchmark sql5 0 to test the OLTP performance of opengauss database, and two server performance monitoring tools, htop iostat. 1. Concept introduction 1.1. Introduction to TPC-C TPC-C is an On-Line Transaction Processing Benchmark. TPC-C is measured in transactions per minute (tpmC). TPC-C is a set of benc ...

1. Query 1.select * from user #Check all fields 2.select name from user # Query specified fields 2. Query and de duplication #Query name and remove duplicate select distinct name from user 3. Query with conditions #Query the information named Tom select * from user where name="Tom" 4. Multi criteria query #The query name is Tom and th ...

In the evening, I went to a Honda car club, the civic of Yishui. Although I'm not the owner of Honda, I like cars very much, so I would go to join in the fun. The civic red in the hatchback is really handsome. Hahaha, I didn't get home until nearly ten o'clock in the evening. It's twelve o'clock after writing this article. Well, no more nonsens ...

1, Database introduction 1.1 related concepts There are many types of databases, including relational database and non relational database. MySQL database (relational) is introduced here Related concepts one ️⃣ DB (database): a "warehouse" for storing data. It holds a series of organized data. two ️⃣ DBMS (database management ...

🏷️ The current chapter is [MySQL basics] 05: DML data operation language 🤖 🏷️ More: MySQL basic tutorial , take you to start MySQL database on a zero basis! 💪 🏷️ Welcome to praise 👍 Collection 🌟 Attention ❤️ Leaving a message. ✍️ DML (Data Manipulation Language) DML is used to add, delete and modify data in the data table. ...

Practice content Please record and share the following: 1 (required) use mysqldump to synchronize the table structure and data of MySQL to the MySQL tenant of OceanBase.2 (required) use datax to configure the offline synchronization from MySQL of at least one table to MySQL tenants of OceanBase. 1. Basic environment mysql stand-alone 192.16 ...

Author: Li XinIn recent ten years, Internet technology has developed rapidly. More and more industries have joined the matrix of the Internet, which has brought more rich and complex business scenario requirements, which is undoubtedly a great challenge to the performance of data application system.Relational database mysql is the most widely u ...

background The day before yesterday, my colleague reported that there was a problem with the redis distributed lock, resulting in duplicate order numbers. Later, everything was normal after it was replaced with reission. Based on this phenomenon, this paper analyzes it Problem driven The following code is analyzed and three problems are foun ...