[mysql] I. MySQL starts

1、MySQL Can I use containers to run ？

Containers are not suitable for operation MySQL

• Data security issues
  • The container can stop at any time 、 Or delete . When the container is rm fall , The data in the container will be lost . To avoid data loss , Users can use data volumes to store data . But the container volumes Design is about Union FS The image layer provides persistent storage , Data security is not guaranteed . If the container suddenly collapses , Database failed to shut down properly , Could damage data . in addition , Shared data volume group in container , The damage to physical machine hardware is also relatively large .
• Performance issues
  • MySQL Relational database , Yes IO The demand is higher . When a physical machine runs more than one ,IO It will add up , Lead to IO bottleneck , Greatly reduced MySQL Read and write performance of . Of course, there are technologies that can solve this problem .
• Network problems
• state
• Resource isolation
• The inapplicability of cloud platform
• Environmental requirements for running the database

2、 Types of databases

• Relational database ：MySQL、oracle、MSSQL、postgreSQL、DB2、informix etc.

It can be understood as columns between different tables ( Field ) Can contact ( Foreign keys )

• Non relational database ：NoSQL、elasticserach、Redis、TIDB

Different business scenarios , Suitable for different databases . So there is no absolute difference between good and bad .

2.1、 Database background

ariaDB Database management system yes MySQL A branch of , Mostly maintained by the open source community , use GPL licensing .MariaDB from MySQL Michael, the founder of · Vidnius led development , He had earlier used 10 A hundred million dollars , Will start their own companies MySQL AB Sold to SUN, thereafter , With SUN Acquired by Oracle ,MySQL The ownership of Oracle In the hands of .MariaDB Name from Michael · Vidnius' daughter Maria （ English ：Maria） Name .MariaDB Of API Compatible with protocol MySQL, In addition, some functions have been added , To support local non blocking operations and progress reporting . Worried about Oracle MySQL A more closed software project ,Fedora The plan is Fedora 19 In order to MariaDB replace MySQL, Wikimedia Foundation Our server also uses MariaDB To replace the MySQL

Now the country promotes the localization of databases . Introduce the database that has been very popular in recent years ：

2021 Domestic database in 12 Strong introduction _GottdesKrieges The blog of -CSDN Blog _ Domestic database