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https://dev.mysql.com/doc/refman/5.7/en/communication-errors.html
Other reasons for problems with aborted connections or aborted clients: The max_allowed_packet variable value is too small or queries require more memory than you have allocated for mysqld. If connection problems occur such as communication errors ...
https://dev.mysql.com/doc/refman/5.7/en/correlated-subqueries.html
For subqueries in HAVING or ORDER BY clauses, MySQL also looks for column names in the outer select list. Aggregate functions in correlated subqueries may contain outer references, provided the function contains nothing but outer references, and ...
https://dev.mysql.com/doc/refman/5.7/en/create-procedure.html
By default, a stored routine is associated with the default database. To associate the routine explicitly with a given database, specify the name as db_name.sp_name when you create it. The CREATE FUNCTION statement is also used in MySQL to support ...
https://dev.mysql.com/doc/refman/5.7/en/create-table.html
RANGE COLUMNS(column_list) This variant on RANGE facilitates partition pruning for queries using range conditions on multiple columns (that is, having conditions such as WHERE a = 1 AND b < 10 or WHERE a = 1 AND b = 10 AND c < 10). LIST ...| ...
https://dev.mysql.com/doc/refman/5.7/en/create-user.html
CREATE USER permits these resource_option values: MAX_QUERIES_PER_HOUR count, MAX_UPDATES_PER_HOUR count, MAX_CONNECTIONS_PER_HOUR count For all accounts named by the statement, these options restrict how many queries, updates, and connections to ...
https://dev.mysql.com/doc/refman/5.7/en/error-log-format.html
The ID included in error log messages is that of the thread within mysqld responsible for writing the message. This indicates which part of the server produced the message, and is consistent with general query log and slow query log messages, which ...
https://dev.mysql.com/doc/refman/5.7/en/explain.html
In practice, the DESCRIBE keyword is more often used to obtain information about table structure, whereas EXPLAIN is used to obtain a query execution plan (that is, an explanation of how MySQL would execute a query). The following discussion uses ...
https://dev.mysql.com/doc/refman/5.7/en/faqs-security.html
Where can I find documentation that addresses security issues for MySQL? A.9.2. Is SSL support built into MySQL binaries, or must I recompile the binary myself to enable it? A.9.5. Does MySQL include support for Roles Based Access Control (RBAC)? ...
https://dev.mysql.com/doc/refman/5.7/en/federated-usagenotes.html
Queries that fail to use indexes can thus cause poor performance and network overload. The following items indicate features that the FEDERATED storage engine does and does not support: The remote server must be a MySQL server. The remote table that ...
https://dev.mysql.com/doc/refman/5.7/en/firewall-usage.html
Before using MySQL Enterprise Firewall, install it according to the instructions provided in Section 6.4.6.2, “Installing or Uninstalling MySQL Enterprise Firewall”. Also, MySQL Enterprise Firewall does not work together with the query cache; ...