Database Administrator

SQL Server 2016: Identify regression defects through Query Store For most developers, a regression defect in performance can usually be traced back to a special event, such as a large influx of users or code changes. For database developers, the

MySQL multi-instance application configuration and deployment guide I. Functions of multiple Mysql instances 1. effectively use server resourcesWhen the resources of a single server are surplus, the remaining resources can be fully utilized to

ERROR 1130 (HY000) When remotely connecting to the MySQL server) When we remotely connect to the MySQL server, the following error is reported.[Root @ d1_cvmzjgltest2 ~] # Mysql-h 10.1.1.6-u root-pEnter password:ERROR 1130 (HY000): Host '10. 1.1.5

MySQL Engine Features-InnoDB undo log roaming This article describes the entire Undo lifecycle process. The code analysis is based on the latest version of MySQL5.7. This article can also serve as a guide to the Code for understanding the entire

Manage the logon (start) account and password of the SQL Server service Today, I handled an alwaysOn problem-the secondary copy is always displayed [not synchronized-suspicious] due to insufficient disk space. In the log, we can see that the

Oracle 12c auto-incrementing column Identity Columns In the 12c version of Oracle, Oracle implements auto-increment columns similar to auto_increment in MySQL. Let's take a look at how Oracle is implemented. Oracle Database 12c Enterprise Edition

Seven differences between MySQL and Oracle: User Permissions: mysqloracle User Permissions No. Category ORACLE MYSQL Note 1 Create user Create user user_name identified by

Tutorial on installing PostgreSQL on Mac OS, ospostgresql Let me start with it. For a long time, I have been cooperating with MySQL, a long-tested old friend. However, after learning a little about PostgreSQL, I have been fascinated by its rich

Cassandra Getting Started Guide-installation and configuration, cassandra Getting Started Guide -- Today, we will start to learn about Cassandra, A NoSQL database, and record the process for your reference. Introduction Apache Cassandra is an

Beckham _ redis hash type learning, Beckham _ redishash type Redis Hash type 1. View hash commands Ii. Detailed description of operating hash commands   1. View hash commands 1. Enter help @ hash 127.0.0.1: 6379> help @ hash HDEL key field [field...]

Oracle Database software standard edition has one restriction: Only one rman channel can be used, and only Lerman One limitation of Oracle Database Software Standard Edition: Only one rman channel can be used Restrictions in "Standard Edition"

About with (nolock) in SQL and withnolock in SQL What does NOLOCK in SQL Server mean? It is generally used in such statements: select * from t with (NOLOCK)Nolock is a non-lock query that can read the data locked by the transaction, also known as

MySQL-5.6.25 database installation-free configuration, mysql-5.6.25 installation-free Recently, when I was in contact with the MySql database and started the installation, I was always prompted that the configuration file could not be written during

Beckham _ mysql database backup and recovery, _ mysql Database BackupMysql database backup and recoveryBrief:I. Database Backup2. database recoveryI. Database Backup 1. Simple backup Description: Incremental backup and overall backup during system

I think this is the difference between marketing ideas. The so-called ideas determine the way out and the Way OutArticle marketing rather than soft text MarketingFirst of all, I want to talk about it.C. I prefer to call it article marketing for soft-

New feature 3 of Oracle12c-enhanced management functions and new features of oracle12c 1. Online renaming and migration of data files In Oracle12cR1, migration or renaming of data files does not require a series of steps. For example, you need to

Error code: 1582 Incorrect parameter count in the call to native function 'str _ to_date ', parameter1. Error description 1 queries executed, 0 success, 1 errors, 0 warnings query: SELECT t. 'name', DATE_FORMAT (str_to_date ('20140901'), '% y') as

Statistical analysis table of stored procedures in case of ORA-00600 error analysis and processing, stored procedures ora-00600 1. Part of the stored procedure of the statistical analysis table Createor replace procedure SEA. sp_analyze_XXX_

SQL Script for read information from a csv file in FTP Server, scriptcsv DECLARE w_file_path VARCHAR2(4000) := 'XXIF_INPUT'; --all_directories.directory_name w_file_name VARCHAR2(4000) := 'lcytest001.csv'; --The file name w_file_exists

SQL statements Delete duplicate records and retain only one record. Copy codeThe Code is as follows:Delete WeiBoTopics where Id in (select max (Id) from WeiBoTopics group by WeiBoId, Title having COUNT (*)> 1 ); SQL: delete duplicate data. Only one