#Galera集群特点
No delay between clusters, synchronous replication. While Master-slave master-slave asynchronous replication, there is a delay.
Active-active Multi-master, the cluster internal server is written at the same time, must wait for all the databases in the cluster to complete the data write, the feedback is complete, so there is no data loss situation.
The cluster node automatically fails over, and if a single node fails in the cluster, the failed node is automatically pu
data types (Note: This article is shown as root permissions)
(1) MARIADB CREATE database
1.1: Create a database using Mysqladmin
[root@test01 10.19.166.166 ~]
# mysqladmin-u Root-p Create testdb1
Enter Password: //Here to fill in the MARIADB database password
Problem Description: SQL Server Authentication Mode login, CREATE DATABASE error: "Master" rejected the Create DB permission issue.
Solution: First, re-login with Windows mode, click "Security-> Login", and then there will be a drop-down list of login names,
Then, double click on the sign-in name that you last failed, and the following interface appears:
Brief: create a new mariadb (mysql) remote connection user. 1. use root for remote connection. By default, root does not allow remote database connection. MariaDB [mysql] gt; selecthostfromuserwhereuser = #39; root #39; + --------------------- + | host
Brief: create a new mariad
MANAGEMENT LOCAL;--Create a tablespace for indexes, separate from user tablespace (optional)CREATE tablespace Indx_tbs LOGGINGDataFile '/app/oracle/oradata/mynewdb/indx01.dbf 'SIZE 100M Reuse autoextend on NEXT 10M MAXSIZE UNLIMITEDEXTENT MANAGEMENT LOCAL;Step 10: Run the script to build the data dictionary viewPerformed by a user with SYSDBA permissions:@?/rdbms/admin/catalog.sql@?/rdbms/admin/catproc.sql
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First, install the MySQL/Mariadb server and client, and connect to the server.In the command, uppercase letters are the keywords of SQL, and lowercase letters are their own attributes and data.0X00 connect to the databaseConnect to 127.0.0.1 using mysql and log on with the root user. The password is waiting for input.Mysql-h 127.0.0.1-u root-p0X01 create a databaseCreate a database named schoolCreate databa
LocalDB is a new feature of SQL Server 2012, a lightweight database specifically tailored for developers, and describes how to use it.How to create a LOCALDB database:Open Server Explorer, right click on "Data Connection" to create a new SQL Server database, the server name is filled in: (LocalDB) \v11.0, which means connecting to the v11.0 instance.Create a new database named "Work" and click the "OK" butt
OracleOperationRemote databaseYou can useCreate a DB LinkThis document describes the creation process in detail. Now let's get started. Assume that the local IP address is 192.168.1.11, database instance orcl, User name: tysp, password: test Remote database IP Address: 192.168.1.52, database instance lntysp, User name: tysp, password: 12345678.
1. Create a DB Lin
Create a collection command for MongoDB db. createCollection
Create a collection command for MongoDB db. createCollection
The complete command is as follows:Db. createCollection (name, {capped:
, AutoIndexId:
, Size:
, Max
})
Name: Set nameCapped: whether to enable the
A database in Oracle is also known as a DB instance, and Oracle can choose to create a database during the installation process, or it can be installed and then created.Generally, the creation of a database can use graphical interface and SQL instructions, because of the complexity of SQL instructions, this is only a graphical interface approach.1. Create a
How to create an oracle db Link
Known: database 1: test1; database 2: Test2Requirement: Create a DB link from database 1 to database 2
Solution 1:
1. on the computer where database 1 is located, create the service name to database 2: orl_test22.
Let ' s say we is going to develop a application for a bank, or any other enterprise, this application need a DB. And we decide to choose Oracle 12c. Then we make a plan:
Application is to Wbbank, so name is Wbbank
Application DB is running in a individual PDB
Application DB have its own tablespace
There is both users for this
Application is to Wbbank, so name is Wbbank
Application DB is running in a individual PDB
Application DB have its own tablespace
There is both users for this DB, one was to administrate objects of the db (Schema), which was used by DBA and other one is To operate the data, which was used by application
Tags: middle codefirst def contex generate inherit localhost data contextOfficial Tutorial: https://docs.microsoft.com/en-us/aspnet/core/data/?view=aspnetcore-2.1 Using EF codefirst to create a new database in MySQL, we first use the JSON pair in the Appsettings.json folder to give the MySQL database connection statement, followed by theStartup.cs uses MySQL intermediate price to inject MySQL service, here, I use the MySQL driver is Pomelo.EntityFramo
UTC nanoseconds, and just started in this big circle, writing data can be successful but cannot be queried because of the wrong time. Java does not have a direct UTC nanosecond method, only System.currenttimemillis () gets the millisecond method. In fact, according to the millisecond and nanosecond conversion units, directly in the System.currenttimemillis () plus six 0 can be. Given the fact that there will be concurrent writes, the same data may be written within a millisecond, and the 6-bit
In some cases, you need to associate different databases for Data Query and operations.
In Oracle, database links are used to associate tables with different databases ).
There are two ways to create a DB link: Creating an SQL statement and creating it on a visual interface (actually an executed SQL statement ).
1. Create a project using PL/SQL Developer
Name:
Label:MySQL supports the creation of timed tasks, requiring the MySQL server to start scheduled task scheduling. 1. Check if scheduled task execution is turned onSHOW VARIABLES like ' Event_scheduler '; Off means no open2. Turn on timed tasksSET GLOBAL event_scheduler = on;OrAdd Event_scheduler = 1 in the my.cnf file 3. Writing timed Tasks Syntax rules: CREATE EVENT [IF not EXISTS] Event_Name//Specify name On SCHEDULE SCHEDULE//Specify task scheduling
Create a separate DB instanceDatabase 1 Database 2ORCL Law------RDBMS (Service)| |-----------------------Installing the Database software (DBMS)Create a separate Rdbms--law[Email protected] ~]# Xhost +Access control disabled, clients can connect from any host-automatically starts the Xmanager passive[Email protected] ~]# su-oracle[Email protected] ~]$ export disp
Tags: span create visual output blog Contex too Col entity classInstall the following three packages first:install-PackageMicrosoft.EntityFrameworkCore.SqlServerInstall-Package Microsoft.EntityFrameworkCore.ToolsInstall-package Microsoft.VisualStudio.Web.CodeGeneration.DesignThen the package management console default project switches to the appropriate project and runs:" Data source=192.168.110.129;initial Catalog=yourdb; User Id=youruserid; Password
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