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https://dev.mysql.com/doc/refman/8.0/en/datetime.html
A DATETIME or TIMESTAMP value can include a trailing fractional seconds part in up to microseconds (6 digits) precision. This section describes their characteristics, how they are similar, and how they differ. MySQL recognizes DATE, DATETIME, and ...
https://dev.mysql.com/doc/refman/8.0/en/error-log-event-fields.html
Core Error Event Fields Optional Error Event Fields Core Error Event Fields These error event fields are core fields: time The event timestamp, with microsecond precision. Error events intended for the error log contain a set of fields, each of ...
https://dev.mysql.com/doc/refman/8.0/en/fractional-seconds.html
MySQL has fractional seconds support for TIME, DATETIME, and TIMESTAMP values, with up to microseconds (6 digits) precision: To define a column that includes a fractional seconds part, use the syntax type_name(fsp), where type_name is TIME, ...For ...
https://dev.mysql.com/doc/refman/8.0/en/glossary.html
L latch A lightweight structure used by InnoDB to implement a lock for its own internal memory structures, typically held for a brief time measured in milliseconds or microseconds. These terms are commonly used in information about the MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-cmpmem-table.html
RELOCATION_TIME The total time in microseconds used for relocating blocks of size PAGE_SIZE. The INNODB_CMPMEM and INNODB_CMPMEM_RESET tables provide status information on compressed pages within the InnoDB buffer pool. The INNODB_CMPMEM and ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-shm-definition.html
(NDB 8.0.13) When receiving, the time to wait before sleeping, in microseconds. Communications between NDB cluster nodes are normally handled using TCP/IP. The shared memory (SHM) transporter is distinguished by the fact that signals are ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-performance-thread_concurrency.html
Once the number of executing threads reaches this limit, additional threads sleep for a number of microseconds, set by the configuration parameter innodb_thread_sleep_delay, before being placed into the queue. InnoDB uses operating system threads ...
https://dev.mysql.com/doc/refman/8.0/en/keywords.html
Certain keywords, such as SELECT, DELETE, or BIGINT, are reserved and require special treatment for use as identifiers such as table and column names. This may also be true for the names of built-in functions. Some keywords which are otherwise ...
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.