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https://dev.mysql.com/doc/internals/en/error-message-marking-obsolete.html
This should be done only for messages that no longer used in the server code. Beginning with MySQL 8.0, it is possible to mark an error message obsolete. The following procedure shows how to do this, using the ER_HASHCHK error as an example. Find ...
https://dev.mysql.com/doc/internals/en/error-messages-storage-engine.html
For example: Got error 788 'Could not connect to remote server fed.bb.pl' from FEDERATED The Got error %d part will be returned in the user's selected language, but the handler-specific one will use English (unless the handler supports returning the ... To add error messages for table handlers, the following example may be ...
https://dev.mysql.com/doc/internals/en/event-class-archaeological-notes.html
Despite the "V3" in the type code name, START_EVENT_V3 currently is used as the type code not only for v3 start events, but also for v1 start events. The original symbol for type code 1 was START_EVENT in the format now known as v1. Later, when v3 ...
https://dev.mysql.com/doc/internals/en/event-classes-and-types.html
Internally, the server uses C++ classes to represent binary log events. Type codes are associated with subclasses because class instance contents are written to binary or relay logs or are sent over the network from master to slave. In those ...
https://dev.mysql.com/doc/internals/en/extra-directory.html
These programs are all standalone utilities, that is, they have a main() function and their main role is to show information that the MySQL server needs or produces. They are as follows: comp_err.c --- makes error-message files from a multi-language ...
https://dev.mysql.com/doc/internals/en/guided-tour-majordir-client.html
There are other utilities too in fact, you'll find the source of most client-side programs here. There are also programs for checking the password, and for testing that basic functions such as threading or access via SSL are possible. You'll notice, ...
https://dev.mysql.com/doc/internals/en/guided-tour-recap.html
Three: The main sequence, as one walks through the server code. We worked hard to make a description of the MySQL source that is simple, without distorting. If you were able to follow all that we've said, then that's wonderful, congratulations. If ...
https://dev.mysql.com/doc/internals/en/implementing-commit.html
If the server is in auto-commit mode, the storage engine should automatically commit all read-only statements such as SELECT. During a commit operation, all changes made during a transaction are made permanent and a rollback operation is not ...
https://dev.mysql.com/doc/internals/en/implementing-savepoint-set-method.html
When savepoint_set() is called, the storage engine needs to store savepoint information into sv so that the server can later roll back the transaction to the savepoint or release the savepoint resources. The savepoint_set() method is called ...
https://dev.mysql.com/doc/internals/en/initial-handshake.html
Initial Handshake starts with server sending the Initial Handshake Packet. After this, optionally, client can request an SSL connection to be established with SSL Connection Request Packet, and then client sends the Handshake Response Packet.