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https://dev.mysql.com/doc/internals/en/event-data-for-specific-event-types.html
How come statements with a nonzero error code can exist in the binary log? This is mainly due to the use of nontransactional tables within transactions. SELECT fails after inserting 1000 rows into a MyISAM table (for example, with a duplicate-key ...
https://dev.mysql.com/doc/refman/8.4/en/stored-program-restrictions.html
The following statements are not permitted: The locking statements LOCK TABLES and UNLOCK TABLES. This includes SELECT statements that do not have an INTO var_list clause and other statements such as SHOW, EXPLAIN, and CHECK TABLE. A stored function ...Some of the restrictions noted here apply to all stored routines; that is, both to stored procedures and stored ...
https://dev.mysql.com/doc/ndbapi/en/ndb-ndboperation.html
Enumeration values Possible values are shown, along with descriptions, in the following table: Table 2.51 NdbOperation::AbortOption type values and descriptions Name Description AbortOnError A failed operation causes the transaction to abort. When ...Beginning with NDB 8.0.30, NdbOperation supports an interpreted code API similar to that implemented by ...
https://dev.mysql.com/doc/refman/8.4/en/data-size.html
Design your tables to minimize their space on the disk. Smaller tables normally require less main memory while their contents are being actively processed during query execution. Any space reduction for table data also results in smaller indexes ...
https://dev.mysql.com/doc/refman/8.4/en/memory-use.html
The InnoDB buffer pool is a memory area that holds cached InnoDB data for tables, indexes, and other auxiliary buffers. For each MyISAM table the server opens, the index file is opened once; the data file is opened once for each concurrently running ... MySQL allocates buffers and caches to improve performance of database ...
https://dev.mysql.com/doc/relnotes/mysql/8.4/en/news-8-4-5.html
If this happens in a table's constraints, default expressions, partitioning expressions, or virtual columns, the table could not be opened. This prevented both analyzing the problem (using, for example, SHOW CREATE TABLE) and addressing it (such as ...(Bug #37570206) Audit Log Notes <COMMAND_CLASS> was not populated for ...
https://dev.mysql.com/doc/refman/8.4/en/tracing-example.html
Next, for every table in the query, we estimate the cost of, and number of records returned by, a table scan or a range access. "resulting_clause_is_simple": true, "resulting_clause": "`test`.`alias1`.`col_int_key`" } /* clause_processing */ }, The ...Now we can examine the trace, whose first column (QUERY), containing the original statement to be traced, is shown here: SELECT * FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE\G *************************** ...
https://dev.mysql.com/doc/refman/8.4/en/create-trigger.html
A trigger is a named database object that is associated with a table, and that activates when a particular event occurs for the table. The trigger becomes associated with the table named tbl_name, which must refer to a permanent table. You cannot ...
https://dev.mysql.com/doc/refman/8.4/en/handler.html
] HANDLER tbl_name CLOSE The HANDLER statement provides direct access to table storage engine interfaces. OPEN statement opens a table, making it accessible using subsequent HANDLER ... This table object is not shared by other sessions and is not ...
https://dev.mysql.com/doc/ndbapi/en/ndb-examples-simple-dual.html
This example demonstrates synchronous transactions and connecting to multiple clusters in a single NDB API application. The source code for this program may be found in the NDB Cluster source tree, in the file ...