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https://dev.mysql.com/doc/internals/en/old-password-authentication.html
Image description Warning The hashing algorithm used for this auth method is broken as shown at http://sqlhack.com/ and CVE-2000-0981 . Authentication::Old: auth_method_name is mysql_old_password client-side requires "8-byte random challenge" from ...
https://dev.mysql.com/doc/internals/en/optimizer-code-concepts.html
This section discusses key optimizer concepts, terminology, and how these are reflected in the MySQL server source code.
https://dev.mysql.com/doc/internals/en/optimizer-joins.html
This section discusses the various methods used to optimize joins.
https://dev.mysql.com/doc/internals/en/optimizer-late-nulls-filtering.html
This optimization reuses the null_rejecting attribute produced by the early NULLs filtering code (see Section 7.3.1.1, “Early NULLs Filtering”). Suppose we have a query plan with table tblX being accessed via the ref access method: ...
https://dev.mysql.com/doc/internals/en/optimizer-nulls-filtering.html
This section discusses the NULLs filtering optimization used for ref and eq_ref joins.
https://dev.mysql.com/doc/internals/en/optimizer-other-optimizations.html
In this section, we discuss other, more specialized optimizations performed in the MySQL server.
https://dev.mysql.com/doc/internals/en/optimizer-partitioning-related.html
See Partitioning for general information about the partitioning implementation in MySQL 5.1 and later.
https://dev.mysql.com/doc/internals/en/optimizer-primary-optimizations.html
This section discusses the most important optimizations performed by the server.
https://dev.mysql.com/doc/internals/en/optimizer-trace-implementation.html
A trace is started by creating an instance of Opt_trace_start; information is added to this trace by creating instances of Opt_trace_object and Opt_trace_array, and by using the add() functions of those classes...
https://dev.mysql.com/doc/internals/en/optimizer-trace-testing.html
This feature is tested in mysql-test/suite/opt_trace and unittest/gunit/opt_trace-t. ...