MySQL changes the password and forgets the ROOT password

MySQL changes the password and forgets the ROOT password This document introduces how to modify the user password of MYSQL and how to handle the problem after the root password is forgotten. I. Three password modification methods 1. Modify the logon

Oracle's use of null in not in

Oracle's use of null in not in In the past, I also summarized some Oracle NULL problems. It happened that I saw another point that I didn't find before when I was reading the book, that is the question of using null in not in. SQL> select * from

DataGuard slave database deletes applied logs

DataGuard slave database deletes applied logs The company set up a slave uard. At the beginning, it did not pay attention to the management of archiving logs in the slave database. After the system was running for a while, it was found that the

Three methods for creating a user in MySQL

Three methods for creating a user in MySQL There are three methods for creating a USER in mysql: The insert user table method, the create user method, and the GRANT method. I. Account Name Composition Account composition: User Name + host (So

Summary of MySQL paging technology

Summary of MySQL paging technology -- Method 1: directly use the SQL statements provided by the database--- Statement style: MySQL can use the following method: SELECT * FROM table name limit m, N--- Applicable scenario: Suitable for scenarios with

Enq: CF-contention wait event

Enq: CF-contention wait event Background description: The user reports that the database runs slowly, but the database returns to normal again when it is viewed. The AWR Report of the past period of time is decisively viewed; The AWR report

ORA-12519, TNS: no appropriate service handler found

ORA-12519, TNS: no appropriate service handler found Sometimes it can be connected to the Oracle database, and sometimes it cannot be connected. It may be that the current number of connections on the Oracle database has exceeded the maximum

Oracle index management

Oracle index management After the database has been running for a period of time, due to frequent addition, deletion, and modification, the index will produce fragments, and the query efficiency will naturally be affected when the fragmentation

Summary of MySQL performance monitoring methods

Summary of MySQL performance monitoring methods --- First, the concept that logical reads in Oracle correspond to physical reads is to count and classify the number of data accesses using the data cache technology.--- Physical read, which actually

Install MySQL 5.5 using CMake

Install MySQL 5.5 using CMake This article introduces how to install MYSQL 5.5.36 database through rpm. I. Environment Description OS: Oracle LINUX SERVER _ 64 6.3 software source code package storage location/usr/local/src Source code package

Current online redo logfile loss Handling Method

Current online redo logfile loss Handling Method We have previously performed a recovery drill after the rm-rf operation, and there is no backup. Today, before performing destructive operations, we made an rman full backup, and then deleted all

Detailed introduction to mysqldump

Detailed introduction to mysqldump Note: mysqldump is a tool used by the database for backup and data transfer. It can be used for backup when the data volume is small (several GB. When the data volume is large, mysqldump is not recommended for

Install two mysql database steps in Windows: mysql database

Install two mysql database steps in Windows: mysql databaseBecause the database versions of the new and old projects are too different, the encoding format is different, and the engine is also different, so we have to install two databases.Two mysql

Oracle 11g Automatic Optimization and oracle11g Optimization

Oracle 11g Automatic Optimization and oracle11g Optimization--: Automatic Plan OptimizationBeginDbms_workload_repository.create_snapshot ();End;Select/* + result_cache */count (*) from (select * from HJ. dbtan where object_type = 'table' order by 1

Analysis on the solution of creating and last updating timestamp fields in MySQL, mysql Field

Analysis on the solution of creating and last updating timestamp fields in MySQL, mysql FieldBefore writing this article, clarify my MySQL version. mysql> SELECT VERSION();+------------+| VERSION() |+------------+| 5.5.29-log |+------------+1 row

QlikView format a cell, qlikview Cell

QlikView format a cell, qlikview Cell You can create a pivot Table and a vertical Table or a general Table in QlikView. If the style of a cell is different from that of other cells, such as the color or Border width, you can use the following

Backup mysql for xtrabackup with xbstream and lz4, xtrabackupxbstream

Backup mysql for xtrabackup with xbstream and lz4, xtrabackupxbstream You need to temporarily add an instance for mysql. Using xtrabackup is the easiest and quickest. On an existing data node: /Home/work/app/xtrabackup-2.2.3/innobackupex --

Network-related or instance-specific errors occur when you establish a connection with SQL Server.

Network-related or instance-specific errors occur when you establish a connection with SQL Server. Just like before, I learned the video of the Niuke news publishing system, typed the code, opened the database, and displayed a frame. The details are

Oracle merge into... USING two table join operations (high efficiency), mergeinto... using

Oracle merge into... USING two table join operations (high efficiency), mergeinto... using When the data volume is small, you can use subqueries to associate two tables. However, when the data volume is large, the subquery efficiency is too low

Usage of drop, truncate, and delete statements in sqlserver, sqlservertruncate

Usage of drop, truncate, and delete statements in sqlserver, sqlservertruncate Although it is not recommended that you use commands to delete items in database tables, these delete commands are useful. When talking about the keywords used to delete

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