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https://dev.mysql.com/doc/relnotes/connector-j/en/news-8-0-22.html
(WL #13780) When trying to open multiple connections to a MySQL server using Connector/J with a named pipe on Windows systems, the attempt sometimes failed with the "All pipe instances are busy" error. Deprecation and Removal Notes Functionality ...
https://dev.mysql.com/doc/refman/8.4/en/channels-startup-options.html
--replica-net-timeout=N This value is set per channel, so that each channel waits for N seconds to check for a broken connection. --max-relay-log-size=size Maximum size of the individual relay log file for each channel; after reaching this limit, ...
https://dev.mysql.com/doc/refman/8.4/en/replication-privilege-checks.html
The account can also be safely used by an administrator to apply or reapply transactions from mysqlbinlog output, for example to recover from a replication error on the channel. With statement-based binary logging, some administrator-level ... By ...
https://dev.mysql.com/doc/refman/8.4/en/partitioning-management-range-list.html
To drop the partition named p2, execute the following command: mysql> ALTER TABLE tr DROP PARTITION p2; Query OK, 0 rows affected (0.03 sec) Note The NDBCLUSTER storage engine does not support ALTER TABLE ... Because of this, you must have the DROP ... Adding and dropping of range and list partitions are handled in a similar fashion, so we discuss the management of both sorts of partitioning in this ...
https://dev.mysql.com/doc/mysql-cluster-manager/8.4/en/mcm-restart-cluster.html
Note Depending on the number of nodes and the amount of data stored in the cluster, a rolling restart can take a considerable amount of time, up to several hours for a cluster with a great many data nodes and a large amount of data. This means that ... restart cluster [--sequential-restart] cluster_name This command performs a rolling restart (see Performing a Rolling Restart of an NDB Cluster) of the cluster named ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-replication-applier-status-table.html
This table shows the current general transaction execution status on the replica. REMAINING_DELAY If the replica is waiting for DESIRED_DELAY seconds to pass since the source applied a transaction, this field contains the number of delay seconds ...
https://dev.mysql.com/doc/internals/en/preventing-use-of-optimizer-trace.html
If for some reason, as DBA of a MySQL Server, you wish to prevent all users from seeing traces of their queries, start the server with these options: --maximum-optimizer-trace-max-mem-size=0 --optimizer-trace-max-mem-size=0 This sets the maximum ...
https://dev.mysql.com/doc/internals/en/include-directory.html
Header (*.h) files for most libraries; includes all header files distributed with the MySQL binary distribution. Note that each individual directory will also have its own *.h files, for including in its own *.c programs. The *.h files in the ...
https://dev.mysql.com/doc/internals/en/index-last.html
Synopsis virtual int index_last ( buf); byte * buf ; Description This is the index_last method. Parameters buf - byte array to be populated with matching row. Usage Advance to last row in index and return row in buffer.
https://dev.mysql.com/doc/internals/en/packed-record-layout.html
pack bits (!= NULL bits!): One bit per packable column: FIELD_BLOB: Set if blob is empty. => The "pack bits" are rounded up to the next byte boundary. Each field is copied verbatim unless packed according to the "pack bits" paragraph.