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https://dev.mysql.com/doc/refman/8.4/en/group-replication-limitations.html
Group Replication cannot be started following a MySQL Server upgrade that uses the MINIMAL option (--upgrade=MINIMAL), which does not upgrade system tables on which the replication internals depend. Note For a group in multi-primary mode, unless you ... Limit on Group Size Limits on Transaction Size The following known limitations exist for Group ...
https://dev.mysql.com/doc/refman/8.4/en/group-replication-network-partitioning.html
Detecting Partitions The replication_group_members performance schema table presents the status of each server in the current view from the perspective of this server. The majority of the time the system does not run into partitioning, and therefore ... The group needs to achieve consensus whenever a change that needs to be replicated ...
https://dev.mysql.com/doc/refman/8.4/en/index-merge-optimization.html
This access method merges index scans from a single table only, not scans across multiple tables. AND key_partN = constN Any range condition over the primary key of an InnoDB table. If all columns used in the query are covered by the used indexes, ... The Index Merge access method retrieves rows with multiple range scans and merges their results into ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-init-startup-configuration.html
(The MySQL server changes its current working directory to the data directory when it begins executing.) Alternatively, you can specify an absolute path for system tablespace data files. To specify an alternate location for global temporary ...Note ... The first decisions to make about InnoDB configuration involve the configuration of data files, log files, page size, and memory buffers, which should be configured before initializing ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-introduction.html
Unless you have configured a different default storage engine, issuing a CREATE TABLE statement without an ENGINE clause creates an InnoDB table. InnoDB tables arrange your data on disk to optimize queries based on primary keys. Each InnoDB table ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-moving-data-files-offline.html
The innodb_directories variable, which defines directories to scan at startup for tablespace files, supports moving or restoring tablespace files to a new location while the server is offline. During startup, discovered tablespace files are used ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-next-key-locking.html
Let the table contain rows having id values of 90 and 102. If the locks set on the index records in the scanned range do not lock out inserts made in the gaps (in this case, the gap between 90 and 102), another session can insert a new row into the ... The so-called phantom problem occurs within a transaction when the same query produces different sets of rows at different ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-recovery.html
In some cases of database corruption, it is enough to dump, drop, and re-create one or a few corrupt tables. You can use the CHECK TABLE statement to check whether a table is corrupt, although CHECK TABLE naturally cannot detect every possible kind ...To achieve point-in-time recovery after restoring a backup, you can apply changes from the binary log that occurred after the backup was ...
https://dev.mysql.com/doc/refman/8.4/en/kerberos-pluggable-authentication.html
Alternatively, to load the plugin at runtime, use this statement: INSTALL PLUGIN authentication_kerberos SONAME 'authentication_kerberos.so'; INSTALL PLUGIN loads the plugin immediately, and also registers it in the mysql.plugins system table to ...
https://dev.mysql.com/doc/refman/8.4/en/loadable-function-reference.html
The following table lists each function that is loadable at runtime and provides a short description of each one. For a table listing built-in functions and operators, see Section 14.1, “Built-In Function and Operator Reference” For general ...