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https://dev.mysql.com/doc/refman/5.7/en/sys-innodb-buffer-stats-by-schema.html
These views summarize the information in the INFORMATION_SCHEMA INNODB_BUFFER_PAGE table, grouped by schema. Warning Querying views that access the INNODB_BUFFER_PAGE table can affect performance. Do not query these views on a production system ...
https://dev.mysql.com/doc/refman/5.7/en/sys-ps-setup-show-disabled.html
Displays all currently disabled Performance Schema configuration. Parameters in_show_instruments BOOLEAN: Whether to display disabled instruments. This might be a long list. in_show_threads BOOLEAN: Whether to display disabled threads. Example ...
https://dev.mysql.com/doc/refman/5.7/en/sys-ps-trace-statement-digest.html
If you find a statement of interest within the Performance Schema events_statements_summary_by_digest table, specify its DIGEST column MD5 value to this procedure and indicate the polling duration and interval. in_start_fresh BOOLEAN: Whether to ...
https://dev.mysql.com/doc/refman/5.7/en/sys-statement-analysis.html
full_scan The total number of full table scans performed by occurrences of the statement. tmp_tables The total number of internal in-memory temporary tables created by occurrences of the statement. tmp_disk_tables The total number of internal ...The ...
https://dev.mysql.com/doc/refman/5.7/en/thread-pool-operation.html
As connections are established, the thread pool assigns them to thread groups in round-robin fashion. A statement becomes blocked if it encounters a disk I/O operation or a user level lock (row lock or table lock). Thus, given a mix of statements ...
https://dev.mysql.com/doc/refman/5.7/en/use.html
The named database remains the default until the end of the session or another USE statement is issued: USE db1; SELECT COUNT(*) FROM mytable; # selects from db1.mytable USE db2; SELECT COUNT(*) FROM mytable; # selects from db2.mytable The database ... USE db_name The USE statement tells MySQL to use the named database as the default (current) database for subsequent ...
https://dev.mysql.com/doc/refman/5.7/en/user-variables.html
(Exception: A user with access to the Performance Schema user_variables_by_thread table can see all user variables for all sessions.) All variables for a given client session are automatically freed when that client exits. (This is the same ... You ...
https://dev.mysql.com/doc/refman/5.7/en/what-is-mysql.html
A relational database stores data in separate tables rather than putting all the data in one big storeroom. The logical model, with objects such as databases, tables, views, rows, and columns, offers a flexible programming environment. You set up ...
https://dev.mysql.com/doc/refman/5.7/en/windows-server-first-start.html
Note The initial root account in the MySQL grant tables has no password. This section gives a general overview of starting the MySQL server. The following sections provide more specific information for starting the MySQL server from the command ...
https://dev.mysql.com/doc/refman/5.7/en/windows-symbolic-links.html
After this, all tables created in the database mydb are created in D:\data\mydb. Alternatively, on any version of Windows supported by MySQL, you can create a symbolic link to a MySQL database by creating a .sym file in the data directory that ...