There are several types of InnoDB engine tables in MySQL (the following index, no special instructions, refers to the InnoDB engine table index.) 0 = Secondary Index, 2-level index, 1 = Clustered Index, clustered index 2 = Unique Index, Unique Index 3 = Primary Index, Primary Key Index 32 = Full-text Index, Full Index 64 […]
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1.Linux under MySQL to create a user backup role, and granted the role of SELECT, RELOAD, SHOW DATABASES, LOCK TABLES and other permissions.
mysql> create user ‘backuper’@’localhost’ identified by ‘********’; Query OK, 0 rows affected (0.00 sec) mysql> grant SELECT, RELOAD, SHOW DATABASES, LOCK TABLES on *.* to backuper@localhost; Query OK, 0 rows affected […] surroundings CentOS 6.6 X86_64 background Forget how to do root, forget to initialize MySQL generated when the random password how to do, or simply did not register that random password, do not tell me to clear all the data under data, reinitialize, of course, you have to be so wayward can also be. Do not […] 1. Background MySQL database centralized operation and maintenance, through a server, the deployment of running multiple MySQL service process, through a different socket to monitor different service ports to provide their services. Each instance is independent of each other, each instance of the datadir, port, socket, pid are different. 2. Multi-instance features * Effective use […] CentOS 7 under the local installation of MySQL 5.7, but the springboot integration jpa will appear hibernateException, do not know why, for a MySQL5.6 version of MySQL, source installation, cmake has been through, and later into rpm installation. Local installation of mysql5.7, but the integration of springboot jpa will appear hibernateException, do not know why, […] Since MySQL 5.6, there have been some improvements in the index, such as the index condition pushdown (ICP), strictly speaking, the optimizer level improvement. If it is simple to understand, that is, the optimizer will try to index the treatment from the Server layer to the storage engine layer. As an example, there is a […] MariaDB Galera Cluster deployment (how quickly deploy MariaDB cluster) MariaDB is a branch of Mysql, has been widely used in open source projects, such as hot openstack, therefore, in order to ensure high availability of services, while increasing the load capacity of the system, clustered deployment is essential. MariaDB Galera Cluster Introduction MariaDB MariaDB […] Description This article uses MySQL-5.7.18. The operating system is 64-bit CentOS Linux release 7.2.1511 (Core), installed as a desktop. Uninstall MariaDB CentOS7 defaults to installing MariaDB instead of MySQL, and the yum server also removes the MySQL-related packages. Because MariaDB and MySQL may conflict, so first uninstall MariaDB. View the installed DebianDB related rpm package. […] You may have a database server which started out small, with all its databases stored on the same disks, that is now experiencing severe storage I/O bottlenecks. With so many heavily accessed databases on the same storage device your queries are timing out while waiting for response from disk. And despite all your efforts in […] SQL databases are very good at storing and retrieving data, and they can do so quickly. However, no matter how well you tune your database servers there will come a time during periods of high traffic that your database server becomes a large bottleneck. By utilizing technologies like Memcache, we can keep results of frequently […] |
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