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https://dev.mysql.com/doc/refman/8.0/en/innodb-best-practices.html
Group sets of related DML operations into transactions by bracketing them with START TRANSACTION and COMMIT statements. Specify a primary key for every table using the most frequently queried column or columns, or an auto-increment value if there is ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-file-space.html
The pages are grouped into extents of size 1MB for pages up to 16KB in size (64 consecutive 16KB pages, or 128 8KB pages, or 256 4KB pages). The data files that you define in the configuration file using the innodb_data_file_path configuration ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-buffer-pool-tables.html
The InnoDB INFORMATION_SCHEMA buffer pool tables provide buffer pool status information and metadata about the pages within the InnoDB buffer pool. The InnoDB INFORMATION_SCHEMA buffer pool tables include those listed below: mysql> SHOW TABLES FROM ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-troubleshoot.html
This section describes issues that you may encounter when using the InnoDB memcached plugin. If you encounter the following error in the MySQL error log, the server might fail to start: failed to set rlimit for open files. One solution is to raise ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-online-ddl-single-multi.html
Operations all using the same specific LOCK clause, that you want to either succeed or fail as a group. Before the introduction of online DDL, it was common practice to combine many DDL operations into a single ALTER TABLE statement. Because each ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-performance-ro-txn.html
InnoDB can avoid the overhead associated with setting up the transaction ID (TRX_ID field) for transactions that are known to be read-only. A transaction ID is only needed for a transaction that might perform write operations or locking reads such ...
https://dev.mysql.com/doc/refman/8.0/en/json-search-functions.html
This includes (but is not limited to) SELECT lists, WHERE and HAVING clauses, and ORDER BY and GROUP BY clauses. The functions in this section perform search or comparison operations on JSON values to extract data from them, report whether data ...
https://dev.mysql.com/doc/refman/8.0/en/json.html
ORDER BY and GROUP BY for JSON values works according to these principles: Ordering of scalar JSON values uses the same rules as in the preceding discussion. Non-NULL values are converted to a numeric type and aggregated, except for MIN(), MAX(), ...
https://dev.mysql.com/doc/refman/8.0/en/kill.html
In most cases, it might take some time for the thread to die because the kill flag is checked only at specific intervals: During SELECT operations, for ORDER BY and GROUP BY loops, the flag is checked after reading a block of rows. KILL [CONNECTION ...
https://dev.mysql.com/doc/refman/8.0/en/known-issues.html
DISTINCT with ORDER BY does not work inside GROUP_CONCAT() if you do not use all and only those columns that are in the DISTINCT list. This means that values cannot reliably be used in GROUP BY, ORDER BY, or DISTINCT if they differ only after the ...