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https://dev.mysql.com/doc/refman/5.7/en/performance-schema-wait-tables.html
The Performance Schema instruments waits, which are events that take time. Within the event hierarchy, wait events nest within stage events, which nest within statement events, which nest within transaction events. These tables store wait events: ...
https://dev.mysql.com/doc/refman/5.7/en/perror.html
For most system errors, MySQL displays, in addition to an internal text message, the system error code in one of the following styles: message ... (Errcode: #) You can find out what the error code means by examining the documentation for your ...
https://dev.mysql.com/doc/refman/5.7/en/pluggable-storage.html
MySQL Server uses a pluggable storage engine architecture that enables storage engines to be loaded into and unloaded from a running MySQL server. Plugging in a Storage Engine Before a storage engine can be used, the storage engine plugin shared ...
https://dev.mysql.com/doc/refman/5.7/en/privilege-changes.html
If the mysqld server is started without the --skip-grant-tables option, it reads all grant table contents into memory during its startup sequence. The in-memory tables become effective for access control at that point. If you modify the grant ...
https://dev.mysql.com/doc/refman/5.7/en/procedure-analyse.html
ANALYSE([max_elements[,max_memory]]) Note PROCEDURE ANALYSE() is deprecated as of MySQL 5.7.18, and is removed in MySQL 8.0. ANALYSE() examines the result from a query and returns an analysis of the results that suggests optimal data types for each ...
https://dev.mysql.com/doc/refman/5.7/en/purge-binary-logs.html
PURGE { BINARY | MASTER } LOGS { TO 'log_name' | BEFORE datetime_expr } The binary log is a set of files that contain information about data modifications made by the MySQL server. The log consists of a set of binary log files, plus an index file ...
https://dev.mysql.com/doc/refman/5.7/en/reloading-sql-format-dumps.html
To reload a dump file written by mysqldump that consists of SQL statements, use it as input to the mysql client.
https://dev.mysql.com/doc/refman/5.7/en/rename-user.html
RENAME USER old_user TO new_user [, old_user TO new_user] ... An error occurs for old accounts that do not exist or new accounts that already exist. To use RENAME USER, you must have the global CREATE USER privilege, or the UPDATE privilege for the ...
https://dev.mysql.com/doc/refman/5.7/en/replica-logs-relaylog.html
The relay log, like the binary log, consists of a set of numbered files containing events that describe database changes, and an index file that contains the names of all used relay log files. The term “relay log file” generally denotes an ...
https://dev.mysql.com/doc/refman/5.7/en/replica-logs.html
A replica server creates several repositories of information to use for the replication process: The relay log, which is written by the replication I/O thread, contains the transactions read from the replication source server's binary log. The ...