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https://dev.mysql.com/doc/refman/8.0/en/string-literals.html
A string is a sequence of bytes or characters, enclosed within either single quote (') or double quote (") characters. Examples: 'a string' "another string" Quoted strings placed next to each other are concatenated to a single string. The following ...
https://dev.mysql.com/doc/refman/8.0/en/string-type-syntax.html
The string data types are CHAR, VARCHAR, BINARY, VARBINARY, BLOB, TEXT, ENUM, and SET. In some cases, MySQL may change a string column to a type different from that given in a CREATE TABLE or ALTER TABLE statement. For definitions of character ...
https://dev.mysql.com/doc/refman/8.0/en/structured-system-variables.html
A structured variable differs from a regular system variable in two respects: Its value is a structure with components that specify server parameters considered to be closely related. There might be several instances of a given type of structured ...
https://dev.mysql.com/doc/refman/8.0/en/sys-diagnostics.html
Creates a report of the current server status for diagnostic purposes. This procedure disables binary logging during its execution by manipulating the session value of the sql_log_bin system variable. That is a restricted operation, so the ...
https://dev.mysql.com/doc/refman/8.0/en/sys-statements-with-runtimes-in-95th-percentile.html
These views list statements with runtimes in the 95th percentile. The statements_with_runtimes_in_95th_percentile and x$statements_with_runtimes_in_95th_percentile views have these columns: query The normalized statement string. db The default ...
https://dev.mysql.com/doc/refman/8.0/en/sys-table-exists.html
Tests whether a given table exists as a regular table, a TEMPORARY table, or a view. If both a temporary and a permanent table exist with the given name, TEMPORARY is returned. Parameters in_db VARCHAR(64): The name of the database in which to ...
https://dev.mysql.com/doc/refman/8.0/en/system-schema.html
It contains tables that store information required by the MySQL server as it runs. A broad categorization is that the mysql schema contains data dictionary tables that store database object metadata, and system tables used for other operational ...
https://dev.mysql.com/doc/refman/8.0/en/table-cache.html
When you execute a mysqladmin status command, you should see something like this: Uptime: 426 Running threads: 1 Questions: 11082 Reloads: 1 Open tables: 12 The Open tables value of 12 can be somewhat puzzling if you have fewer than 12 tables.
https://dev.mysql.com/doc/refman/8.0/en/thread-pool-tuning.html
This section provides guidelines on determining the best configuration for thread pool performance, as measured using a metric such as transactions per second. Of chief importance is the number of thread groups in the thread pool, which can be set ...
https://dev.mysql.com/doc/refman/8.0/en/traceable-statements.html
Statements which are traceable are listed here: SELECT INSERT REPLACE UPDATE DELETE EXPLAIN with any of the preceding statements SET DO DECLARE, CASE, IF, and RETURN as used in stored routines CALL Tracing is supported for both INSERT and REPLACE ...