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https://dev.mysql.com/doc/refman/8.0/en/data-dictionary-information-schema.html
In particular, for each INFORMATION_SCHEMA table that is a view on data dictionary tables: The server no longer must create a temporary table for each query of the INFORMATION_SCHEMA table. When the underlying data dictionary tables store values ...
https://dev.mysql.com/doc/refman/8.0/en/data-dictionary-usage-differences.html
Use of a data dictionary-enabled MySQL server entails some operational differences compared to a server that does not have a data dictionary: Previously, enabling the innodb_read_only system variable prevented creating and dropping tables only for ...
https://dev.mysql.com/doc/refman/8.0/en/gone-away.html
This section also covers the related Lost connection to server during query error. The most common reason for the MySQL server has gone away error is that the server timed out and closed the connection. In this case, you normally get one of the ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-configuring-consistency-guarantees.html
Although the Transaction Synchronization Points section explains that conceptually there are two synchronization points from which you can choose: on read or on write, these terms were a simplification and the terms used in Group Replication are: ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-frequently-asked-questions.html
What is the maximum number of MySQL servers in a group? A group can consist of maximum 9 servers. Attempting to add another server to a group with 9 members causes the request to join to be refused. This limit has been identified from testing and ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-limitations.html
Limit on Group Size Limits on Transaction Size The following known limitations exist for Group Replication. Note that the limitations and issues described for multi-primary mode groups can also apply in single-primary mode clusters during a ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-performance-message-fragmentation.html
When an abnormally large message is sent between Group Replication group members, it can result in some group members being reported as failed and expelled from the group. This is because the single thread used by Group Replication's group ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-performance-xcom-cache.html
The group communication engine for Group Replication (XCom, a Paxos variant) includes a cache for messages (and their metadata) exchanged between the group members as a part of the consensus protocol. Among other functions, the message cache is ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-responses-failure-expel.html
You can use the group_replication_member_expel_timeout system variable, which is available from MySQL 8.0.13, to allow additional time between the creation of a suspicion and the expulsion of the suspect member. A suspicion is created when one ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-optimization.html
Applications that monitor databases may make frequent use of INFORMATION_SCHEMA tables. To write queries for these tables most efficiently, use the following general guidelines: Try to query only INFORMATION_SCHEMA tables that are views on data ...