Database Administrator

Use LVM to back up and restore the MariaDB Database Comparison with mysqldump to introduce LVM snapshot volumesMysqldump: Hot Backup cannot be performed, and the backup time is long when the database is large. The advantage is that the Backup

Oracle 18C database creation prompt ORA-12754 error Solution In order to experience Oracle 18C, early in the morning on the https://edelivery.oracle.com/osdc/faces/SoftwareDelivery to install the media down. First test the database software

Integration of Hazelcast and MongoDBI. Hazelcast and MongoDB Hazelcast's Distributed Data Structure and computing performance enable it to serve as the "MongoDB" at the application backend ". MongoDB is an open-source, document-oriented database

Oracle Database full recovery and Incomplete recovery, and perform user management for multiple generations recovery, oracle user management Comparison between full recovery and Incomplete recovery: 1. Full recovery: restores the database to the

Disclaimer: The system commands described in this article are "#", which indicates the root permission, and "$" indicates the Oracle permission. 1. Install the systemFirst install the Linux system. According to the recommendations in the official

Some basic knowledge about databases (1) ------ database engine, ------ Database Engine MySQL database provides 13 different storage engines to handle different data processing. Most people who have used MySQL should know the two storage engines

[Redis 1] Redis database learning and practices-installation and deployment, redis learning and practicesRedis database learning and practice-installation and deployment 1: Redis database introduction: Redis-Remote DictionaryServer can be directly

Delete Mysql on Mac and Mysql on Mac First, stop the MySQL service. You can stop the service in preference settings, and then execute the following command $ sudo rm /usr/local/mysql$ sudo rm -rf /usr/local/mysql*$ sudo rm -rf

Chapter 2 User Authentication, Authorization, and Security (4): restrict the management permissions of the SA account, authenticationSource: Workshop Without the consent of the author, no one shall be published in the form of "original" or used for

Cost Calculation Method in execution plan, execution plan cost Concept: Blevel: Binary Height = index height-1 Clustering_factor: Cluster factor, number of blocks in the table to be scanned after index scan, clustering_factor Index scan calculation

[Introduction to Data Mining]-quality of data quality and quality of Introduction to Data MiningData qualityThe data used by data mining is usually collected or collected for other purposes without explicit purpose. Therefore, data quality cannot be

Prerequisites: (1) The zabbix server has been successfully installed and run. (2) The zabbix client has been successfully created and runs. 1. Download and install msmtp Software WgetHttp://sourceforge.net/projects/msmtp/files/msmtp/1.4.32/msmtp-1.

Run the DBCA command on a set of DB servers and report the following error: [Oracle @ game_db ~] $ Dbca Exception in thread "main" [Oracle @ game_db ~] $ [Oracle @ game_db ~] $ ExportDISPLAY = 1921.68.3.189: 0.0 [Oracle @ game_db ~] $ Dbca Exception

To solve the pressure on a single server, the database and sub-server are deployed, but the table data synchronization originally implemented by the trigger cannot be achieved. Because the boss of the Director is not allowed to start the distributed

The SQL statement is as follows:Select distinct cp. name AS cp_name, c. name AS category_name, t. name AS type_name FROM g LEFT JOIN  cp ON cp.id = g.cp_id AND cp.deleted = 0 LEFT JOIN  c ON c.id = g.category_id AND c.deleted = 0 LEFT JOIN  t ON

47 common Oracle PL/SQL Toolkit, oracleplsql47 Oracle PL/SQL Utility Library Common PL/SQL Toolkit code, including: PDF file generation Toolkit: Excel file generation, RTF file generation, Zip file compression and decompression, JSON file

PostgreSQL tutorial (5): Functions and operators (1), postgresql Operators I. logical operators: Common logical operators include AND, OR, and not. Its semantics is exactly the same as that of logical operators in other programming languages. Ii.

DB2 joint database is a special form of distributed database management. In the federated database system, you can use an SQL command to send command requests to multiple data sources. Before remote replication between DB2 and non-DB2 databases,

01. Concept and algorithm basis of Data Structure, 01 Data StructureData Structure concepts and algorithm BasicsI. Data Structure Concept1. Data: A symbol used to describe objective transactions. It is an object that can be operated on by computers.

Inconsistent recovery of data file headers and inconsistent recovery of Data Headers SYS@orcl11g>alter database datafile 6 online;alter database datafile 6 online*ERROR at line 1:ORA-01113: file 6 needs media recoveryORA-01110: data file 6: