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https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-cpudata-1sec.html
The cpudata_1sec table provides data about CPU usage per second over the last 20 seconds.
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-cpudata-20sec.html
The cpudata_20sec table provides data about CPU usage per 20-second interval over the last 400 seconds.
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-cpudata-50ms.html
The cpudata_50ms table provides data about CPU usage per 50-millisecond interval over the last second.
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndb-index-stat.html
ndb_index_stat provides per-fragment statistical information about indexes on NDB tables. This includes cache version and age, number of index entries per partition, and memory consumption by indexes. Running ndb_index_stat with the --update option ...
https://dev.mysql.com/doc/refman/8.0/en/mysqld-safe.html
mysqld_safe is the recommended way to start a mysqld server on Unix. mysqld_safe adds some safety features such as restarting the server when an error occurs and logging runtime information to an error log. A description of error logging is given ...
https://dev.mysql.com/doc/refman/8.0/en/nested-loop-joins.html
MySQL executes joins between tables using a nested-loop algorithm or variations on it. Nested-Loop Join Algorithm Block Nested-Loop Join Algorithm Nested-Loop Join Algorithm A simple nested-loop join (NLJ) algorithm reads rows from the first table ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-filtering.html
Events are processed in a producer/consumer fashion: Instrumented code is the source for events and produces events to be collected. The setup_instruments table lists the instruments for which events can be collected, whether they are enabled, and ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-statement-tables.html
Statement events occur at a high level of the event hierarchy. Within the event hierarchy, wait events nest within stage events, which nest within statement events, which nest within transaction events. These tables store statement events: ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-wait-tables.html
The Performance Schema instruments waits, which are events that take time. Within the event hierarchy, wait events nest within stage events, which nest within statement events, which nest within transaction events. These tables store wait events: ...
https://dev.mysql.com/doc/refman/8.0/en/replication-features-functions.html
Certain functions do not replicate well under some conditions: The USER(), CURRENT_USER() (or CURRENT_USER), UUID(), VERSION(), and LOAD_FILE() functions are replicated without change and thus do not work reliably on the replica unless row-based ...