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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-wait-tables.html
events_waits_history: The most recent wait events that have ended per thread. events_waits_history_long: The most recent wait events that have ended globally (across all threads). The Performance Schema instruments waits, which are events that take ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema.html
Most Performance Schema tables have indexes, which gives the optimizer access to execution plans other than full table scans. The MySQL Performance Schema is a feature for monitoring MySQL Server execution at a low level. The Performance Schema has ...
https://dev.mysql.com/doc/refman/8.0/en/perl-installation.html
MySQL Perl support requires that you have installed MySQL client programming support (libraries and header files). If you do not have access rights to install Perl modules in the system directory or if you want to install local Perl modules, the ...
https://dev.mysql.com/doc/refman/8.0/en/permission-optimization.html
Similarly, if you place no resource limits on any accounts, the server does not have to perform resource counting. If you have a very high statement-processing load, consider using a simplified grant structure to reduce permission-checking overhead.
https://dev.mysql.com/doc/refman/8.0/en/persisted-system-variables.html
A system variable can have a global value that affects server operation as a whole, a session value that affects the current session, or both. To persist system variables, you need not have login access to the MySQL server host or file system access ... The MySQL server maintains system variables that configure its ...
https://dev.mysql.com/doc/refman/8.0/en/point-in-time-recovery-binlog.html
After editing the file, apply the contents as follows: $> mysql -u root -p < tmpfile If you have more than one binary log to apply on the MySQL server, use a single connection to apply the contents of all binary log files that you want to process.
https://dev.mysql.com/doc/refman/8.0/en/precision-math.html
These features have several implications for numeric operations and provide a high degree of compliance with standard SQL: Precise calculations: For exact-value numbers, calculations do not introduce floating-point errors. MySQL provides support ...
https://dev.mysql.com/doc/refman/8.0/en/preface.html
Access to Oracle Support for Accessibility Oracle customers that have purchased support have access to electronic support through My Oracle Support. This is the Reference Manual for the MySQL Database System, version 8.0, through release 8.0.45.
https://dev.mysql.com/doc/refman/8.0/en/prepare.html
As a workaround, refer instead to user-defined variables, which also have session scope; see Section 11.4, “User-Defined Variables”. (In this case, an implicit CAST(? AS derived_type) is performed.) The derived type and actual type of the ...
https://dev.mysql.com/doc/refman/8.0/en/privilege-changes.html
If you modify the grant tables directly using statements such as INSERT, UPDATE, or DELETE (which is not recommended), the changes have no effect on privilege checking until you either tell the server to reload the tables or restart it. Thus, if you ... If the mysqld server is started without the --skip-grant-tables option, it reads all grant table contents into memory during its startup ...