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https://dev.mysql.com/doc/refman/8.0/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/8.0/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/8.0/en/innodb-dedicated-server.html
Warning Prior to MySQL 8.0.14, O_DIRECT_NO_FSYNC was not suitable for file systems such as XFS and EXT4, which require an fsync() system call to synchronize file system metadata changes. When the server is started with --innodb-dedicated-server, ...
https://dev.mysql.com/doc/refman/8.0/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/8.0/en/innodb-memcached-benefits.html
The combination of InnoDB tables and memcached offers advantages over using either by themselves. Data written using the memcached protocol is transparently written to an InnoDB table, without going through the MySQL SQL layer. Data requested ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-dml.html
These operations are guaranteed to only affect one row when issued through the memcached interface, because the key is unique within the table. In the following SQL examples, t1 refers to the table used for memcached operations, based on the ...
https://dev.mysql.com/doc/refman/8.0/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/8.0/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/8.0/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/8.0/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 ...