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https://dev.mysql.com/doc/internals/en/replication-correct.html
(rpl-missing-slave-columns) binlog_format=ROW and the master has extra columns after the columns of the slave, as long as the following rules apply: The slave cannot have both missing columns and extra columns (see above) at the same time. In ...
https://dev.mysql.com/doc/internals/en/replication-source-code-files.html
Files in the plugin/semisync directory: File Description semisync.h/.cc Auxiliary code, particularly for tracing, that is used by both the master semisync module and the slave semisync module. Status of this section: up to date 2009-12-16 Files in ...
https://dev.mysql.com/doc/internals/en/select-subquery.html
To hide difference in performing single SELECTs and UNIONs, Item_subselect uses two different engines, which provide uniform interface for access to underlying SELECT or UNION (subselect_single_select_engine and subselect_union_engine, both are ...
https://dev.mysql.com/doc/internals/en/starting-transaction-from-external-lock-method.html
MySQL calls [custom-engine.html#custom-engine-api-reference-external_lock handler::external_lock()] for every table it is going to use at the beginning of every statement. Thus, if a table is touched for the first time, it implicitly starts a ...
https://dev.mysql.com/doc/internals/en/syntax-debug-sync-values.html
This means that one of the sections separated by '&|' must be present or both of them. The string to "assign" to the DEBUG_SYNC variable can contain: {RESET | <sync point name> TEST | <sync point name> CLEAR | <sync point name> {{SIGNAL <signal ...
https://dev.mysql.com/doc/internals/en/tracing-example.html
The statement's execution is naturally made of "steps": "steps": [ { "join_preparation": { This is a join's preparation "select#": 1, for the first SELECT of the statement (which has only one, here). "rest_of_plan": [ { "database": "test", "table": ...
https://dev.mysql.com/doc/internals/en/transactions-roles-responsibilities.html
If autocommit is not set, the engine must register itself twice -- both in the statement list and in the normal transaction list. The server has only one way to know that an engine participates in the statement and a transaction has been started in ...
https://dev.mysql.com/doc/internals/en/x-protocol-implementation-implementation-notes.html
vectored io combines the best of both approaches and sends multiple buffers to the OS in one syscall and OS can optimize sending multiple buffers in on TCP packet. Topics in this section: Client Server Client and Server implementations of the ...
https://dev.mysql.com/doc/internals/en/x-protocol-messages-messages.html
Topics in this section: Message Structure Message Sequence Common Messages Connection Session Expectations CRUD SQL Result Sets Expressions Data Types This section provides detailed information about how X Protocol defines messages. Message ...
https://dev.mysql.com/doc/internals/en/x-protocol-use-cases-use-cases.html
Figure 15.14 Without PREPARE Stage Dependency Image description That allows the client to send both PREPARE and EXECUTE after each other without waiting for the server's response. Topics in this section: Prepared Statements with Single Round-Trip ...