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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-memory-summary-tables.html
The real memory usage for this account could have been in the range from 11.5MB to 13.5MB. Operation counts help to understand or tune the overall pressure the server is putting on the memory allocator, which has an impact on performance. Allocating ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-processlist-table.html
For a replica SQL thread, the value is the number of seconds between the timestamp of the last replicated event and the real time of the replica host. The MySQL process list indicates the operations currently being performed by the set of threads ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-setup-instruments-table.html
At this point, the real statement type is unknown, the type will be refined after SQL parsing. (Events do not really have a “name,” but this provides a way to associate events with instruments.) ENABLED Whether the instrument is enabled. The ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-overview.html
NDB Cluster nodes can employ different transport mechanisms for inter-node communications; TCP/IP over standard 100 Mbps or faster Ethernet hardware is used in most real-world deployments. NDB Cluster is a technology that enables clustering of ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-threads-table.html
For a replica SQL thread, the value is the number of seconds between the timestamp of the last replicated event and the real time of the replica host. The threads table contains a row for each server thread. Each row contains information about a ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-timing.html
If a processor's cycle rate fluctuates, conversion from cycles to real-time units is subject to error. Events are collected by means of instrumentation added to the server source code. Instruments time events, which is how the Performance Schema ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-user-defined-functions-table.html
The value is one of int, decimal, real, char, or row. The user_defined_functions table contains a row for each loadable function registered automatically by a component or plugin, or manually by a CREATE FUNCTION statement. For information about ...
https://dev.mysql.com/doc/refman/8.0/en/precision-math-numbers.html
In MySQL, types that are synonymous with FLOAT or DOUBLE are DOUBLE PRECISION and REAL. The scope of precision math for exact-value operations includes the exact-value data types (integer and DECIMAL types) and exact-value numeric literals.
https://dev.mysql.com/doc/refman/8.0/en/processlist-access.html
For a replica SQL thread, the value is the number of seconds between the timestamp of the last replicated event and the real time of the replica host. The following discussion enumerates the sources of process information, the privileges required ...
https://dev.mysql.com/doc/refman/8.0/en/proxy-users.html
The plugin that authenticates a given connection may request that the connecting (external) user be treated as a different user for privilege-checking purposes. This enables the external user to be a proxy for the second user; that is, to assume the ...