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https://dev.mysql.com/doc/internals/en/error-masking.html
Example: --error ER_BAD_DB_ERROR USE <not existing database>; You can find the error names in the include/mysqld_error.h file of a MySQL source distribution, or in the Server Error Message Reference section of the MySQL Reference Manual]. Use of the ...
https://dev.mysql.com/doc/internals/en/error-message-multiple-versions.html
However, you must be careful not to wipe out the existing 5.5-specific information in errmsg-utf8.txt. It is critical that error codes are identical in all versions. That is, the value of ER_SOME_ERROR must be the same in all versions for which it ...
https://dev.mysql.com/doc/internals/en/error-messages-5-0-3-higher.html
This is illegal because $2 is missing: "%1$.32s %3$.64s" Use the following procedure to add new error messages: To add a new language translation for an existing error message, find the section for the appropriate error symbol. The file you edit to ...
https://dev.mysql.com/doc/internals/en/event-flags.html
Event headers for v3 format and up contain event flags in the two flag bytes at position FLAGS_OFFSET = 17. There are comments about these flags in log_event.h, in addition to the remarks in this section. Current event flags: ...
https://dev.mysql.com/doc/internals/en/general-trace-structure.html
Query transformations (IN->EXISTS, outer join to inner join...), simplifications (elimination of clauses), equality propagation are shown in subobjects. A trace follows closely the actual execution path: there is a join-preparation object, a ...
https://dev.mysql.com/doc/internals/en/heap-directory.html
All the MySQL table handlers (that is, the handlers that MySQL itself produces) have files with similar names and functions. Thus, this (heap) directory contains a lot of duplication of the myisam directory (for the MyISAM table handler). Such ...
https://dev.mysql.com/doc/internals/en/innodb-fil-trailer.html
The Fil Trailer has one part, as follows: Name Size Remarks FIL_PAGE_END_LSN 8 low 4 bytes = checksum of page, last 4 bytes = same as FIL_PAGE_LSN The final part of a page, the fil trailer (or File Page Trailer), exists because InnoDB's architect ...It's impossible for a page to be only half-written, or corrupted by crashes, because the log-recovery mechanism restores to a consistent ...
https://dev.mysql.com/doc/internals/en/innodb-user-records.html
In the User Records part of a page, you'll find all the records that the user inserted. There are two ways to navigate through the user records, depending whether you want to think of their organization as an unordered or an ordered list. If you ...
https://dev.mysql.com/doc/internals/en/mismatch-of-focus-of-test-and-code-sequence.html
CREATE TABLE t1 ( id INT NOT NULL AUTO_INCREMENT, my_column VARCHAR(30), name LONGTEXT, PRIMARY KEY (id)); INSERT INTO t1(my_column,name) VALUES('2','two'); INSERT INTO t1(my_column,name) VALUES('1','one'); INSERT INTO t1(my_column,name) ...
https://dev.mysql.com/doc/internals/en/multi-resultset.html
If the SERVER_MORE_RESULTS_EXISTS flag is set, that indicates more resultsets will follow. As of MySQL 5.7.5, the resultset is followed by an OK_Packet, and this OK_Packet has the SERVER_MORE_RESULTS_EXISTS flag set to start processing the next ...