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https://dev.mysql.com/doc/refman/8.0/en/if.html
The IF statement can have THEN, ELSE, and ELSEIF clauses, and it is terminated with END IF. [ELSE statement_list] END IF The IF statement for stored programs implements a basic conditional construct. Note There is also an IF() function, which ...
https://dev.mysql.com/doc/refman/8.0/en/index-preloading.html
Although the blocks stay in the cache, because there are enough buffers for all of them, they are fetched from disk in random order, and not sequentially. If there are enough blocks in a key cache to hold blocks of an entire index, or at least the ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-check-constraints-table.html
As of MySQL 8.0.16, CREATE TABLE permits the core features of table and column CHECK constraints, and the CHECK_CONSTRAINTS table provides information about these constraints. The CHECK_CONSTRAINTS table has these columns: CONSTRAINT_CATALOG The ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-foreign-cols-table.html
For related usage information and examples, see Section 17.15.3, “InnoDB INFORMATION_SCHEMA Schema Object Tables”. Use the INFORMATION_SCHEMA COLUMNS table or the SHOW COLUMNS statement to view additional information about the columns of this ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-foreign-table.html
For related usage information and examples, see Section 17.15.3, “InnoDB INFORMATION_SCHEMA Schema Object Tables”. 0 = ON DELETE/UPDATE RESTRICT, 1 = ON DELETE CASCADE, 2 = ON DELETE SET NULL, 4 = ON UPDATE CASCADE, 8 = ON UPDATE SET NULL, 16 = ...The INNODB_FOREIGN table has these columns: ID The name (not a numeric value) of the foreign key index, preceded by the schema (database) name (for example, ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-view-table-usage-table.html
The VIEW_TABLE_USAGE table (available as of MySQL 8.0.13) provides access to information about tables and views used in view definitions. You can see information only for views for which you have some privilege, and only for tables for which you ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-architecture.html
The following diagram shows in-memory and on-disk structures that comprise the InnoDB storage engine architecture. For information about each structure, see Section 17.5, “InnoDB In-Memory Structures”, and Section 17.6, “InnoDB On-Disk ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema.html
This section provides information and usage examples for InnoDB INFORMATION_SCHEMA tables. InnoDB INFORMATION_SCHEMA tables provide metadata, status information, and statistics about various aspects of the InnoDB storage engine. You can view a list ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-physical-structure.html
When new records are inserted into an InnoDB clustered index, InnoDB tries to leave 1/16 of the page free for future insertions and updates of the index records. If records are inserted in a random order, the pages are from 1/2 to 15/16 full. With ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-redo-log-buffer.html
Thus, if you have transactions that update, insert, or delete many rows, increasing the size of the log buffer saves disk I/O. The innodb_flush_log_at_trx_commit variable controls how the contents of the log buffer are written and flushed to disk.