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https://dev.mysql.com/doc/internals/en/defining-filename-extensions.html
Storage engines are required to provide the MySQL server with a list of extensions used by the storage engine with regard to a given table, its data and indexes. Extensions are expected in the form of a null-terminated string array.
https://dev.mysql.com/doc/internals/en/guided-tour-majordir-vio.html
The final major directory that we'll highlight is labelled vio, for "virtual I/O". The vio routines are wrappers for the various network I/O calls that happen with different protocols. The idea is that in the main modules one won't have to write ...
https://dev.mysql.com/doc/internals/en/heartbeat-event.html
It is added by the master after the replication connection was idle for x-seconds to update the slave's Seconds_Behind_Master timestamp in the SHOW SLAVE STATUS output.
https://dev.mysql.com/doc/internals/en/optimizer-tracing.html
In MySQL 5.6, a new tracing capability was added to the MySQL optimizer. The interface is provided by a set of optimizer_trace_xxx system variables and the INFORMATION_SCHEMA.OPTIMIZER_TRACE table, but is subject to change.
https://dev.mysql.com/doc/internals/en/perfect-cleanup.html
Cleaning up becomes much more comfortable and less error prone if you create your "own" database and create all tables there. At the end of the test, you need to drop just this database. Do not forget to remove all users you created and all ...
https://dev.mysql.com/doc/internals/en/select-steps.html
Every select is performed in these base steps: JOIN::prepare Initialization and linking JOIN structure to st_select_lex. fix_fields() for all items (after fix_fields(), we know everything about item).
https://dev.mysql.com/doc/internals/en/start-event-v3.html
Binlog::START_EVENT_V3: A start event is the first event of a binlog for binlog-version 1 to 3. Payload 2 binlog-version string[50] mysql-server version 4 create timestamp Fields binlog-version (2) -- version of this binlog format. mysql-server ...
https://dev.mysql.com/doc/internals/en/starting-transaction.html
A transaction is started by the storage engine in response to a call to either the start_stmt() or external_lock() methods. If there is no active transaction, the storage engine must start a new transaction and register the transaction with the ...
https://dev.mysql.com/doc/internals/en/status-flags.html
Protocol::StatusFlags Flag Value Comment SERVER_STATUS_IN_TRANS 0x0001 a transaction is active SERVER_STATUS_AUTOCOMMIT 0x0002 auto-commit is enabled SERVER_MORE_RESULTS_EXISTS 0x0008 SERVER_STATUS_NO_GOOD_INDEX_USED 0x0010 ...
https://dev.mysql.com/doc/internals/en/test-faults-usage.html
SET SESSION debug="+d,function_crash_return"; will crash the server while returning from function.