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https://dev.mysql.com/doc/refman/8.0/en/replication-solutions-performance.html
As the number of replicas connecting to a source increases, the load, although minimal, also increases, as each replica uses a client connection to the source. Also, as each replica must receive a full copy of the source's binary log, the network ...
https://dev.mysql.com/doc/refman/8.0/en/replication-threads-monitor-main.html
The SHOW PROCESSLIST statement provides information that tells you what is happening on the source and on the replica regarding replication. For information on source states, see Section 10.14.4, “Replication Source Thread States”. For replica ...
https://dev.mysql.com/doc/refman/8.0/en/request-access.html
After the server accepts a connection, it enters Stage 2 of access control. For each request that you issue through the connection, the server determines what operation you want to perform, then checks whether your privileges are sufficient. This ...
https://dev.mysql.com/doc/refman/8.0/en/reset-slave.html
RESET {SLAVE | REPLICA} [ALL] [channel_option] channel_option: FOR CHANNEL channel Makes the replica forget its position in the source's binary log. From MySQL 8.0.22, RESET SLAVE is deprecated and the alias RESET REPLICA should be used instead.
https://dev.mysql.com/doc/refman/8.0/en/revoke.html
[IGNORE UNKNOWN USER] REVOKE [IF EXISTS] ALL [PRIVILEGES], GRANT OPTION FROM user_or_role [, user_or_role] ... [IGNORE UNKNOWN USER] REVOKE [IF EXISTS] PROXY ON user_or_role FROM user_or_role [, user_or_role] ... [IGNORE UNKNOWN USER] REVOKE [IF ...
https://dev.mysql.com/doc/refman/8.0/en/row-constructor-optimization.html
For example, these two statements are semantically equivalent: SELECT * FROM t1 WHERE (column1,column2) = (1,1); SELECT * FROM t1 WHERE column1 = 1 AND column2 = 1; In addition, the optimizer handles both expressions the same way. The optimizer is ...
https://dev.mysql.com/doc/refman/8.0/en/row-subqueries.html
Scalar or column subqueries return a single value or a column of values. A row subquery is a subquery variant that returns a single row and can thus return more than one column value. If this row has col3 and col4 values equal to the col1 and col2 ...
https://dev.mysql.com/doc/refman/8.0/en/secure-client-programming.html
Client applications that access MySQL should use the following guidelines to avoid interpreting external data incorrectly or exposing sensitive information. Handle External Data Properly Handle MySQL Error Messages Properly Handle External Data ...
https://dev.mysql.com/doc/refman/8.0/en/security-against-attack.html
When you connect to a MySQL server, you should use a password. All other information is transferred as text, and can be read by anyone who is able to watch the connection. If the connection between the client and the server goes through an ...
https://dev.mysql.com/doc/refman/8.0/en/security-plugins.html
MySQL includes several components and plugins that implement security features: Plugins for authenticating attempts by clients to connect to MySQL Server. For general discussion of the authentication process, see Section 8.2.17, “Pluggable ...