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https://dev.mysql.com/doc/refman/8.4/en/performance-schema-prepared-statements-instances-table.html
The Performance Schema provides instrumentation for prepared statements, for which there are two protocols: The binary protocol. This is accessed through the MySQL C API and maps onto underlying server commands as shown in the following table. C ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-replication-tables.html
This is similar to the information available from the SHOW REPLICA STATUS statement, but representation in table form is more accessible and has usability benefits: SHOW REPLICA STATUS output is useful for visual inspection, but not so much for ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-setup-actors-table.html
The setup_actors table contains information that determines whether to enable monitoring and historical event logging for new foreground server threads (threads associated with client connections). This table has a maximum size of 100 rows by ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-statement-summary-tables.html
The Performance Schema maintains tables for collecting current and recent statement events, and aggregates that information in summary tables. Section 29.12.6, “Performance Schema Statement Event Tables” describes the events on which statement ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-thread-filtering.html
The threads table contains a row for each server thread. Each row contains information about a thread and indicates whether monitoring is enabled for it. For the Performance Schema to monitor a thread, these things must be true: The ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-timing.html
Events are collected by means of instrumentation added to the server source code. Instruments time events, which is how the Performance Schema provides an idea of how long events take. It is also possible to configure instruments not to collect ...
https://dev.mysql.com/doc/refman/8.4/en/persisted-system-variables.html
The MySQL server maintains system variables that configure its operation. 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. Many system variables are ...
https://dev.mysql.com/doc/refman/8.4/en/pluggable-storage-common-layer.html
A MySQL pluggable storage engine is the component in the MySQL database server that is responsible for performing the actual data I/O operations for a database as well as enabling and enforcing certain feature sets that target a specific ...
https://dev.mysql.com/doc/refman/8.4/en/point-in-time-recovery-binlog.html
This section explains the general idea of using the binary log to perform a point-in-time-recovery. The next section, Section 9.5.2, “Point-in-Time Recovery Using Event Positions”, explains the operation in details with an example. Note Many of ...
https://dev.mysql.com/doc/refman/8.4/en/precision-math-rounding.html
This section discusses precision math rounding for the ROUND() function and for inserts into columns with exact-value types (DECIMAL and integer). The ROUND() function rounds differently depending on whether its argument is exact or approximate: ...