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https://dev.mysql.com/doc/refman/9.7/en/performance-schema-statement-histogram-summary-tables.html
The Performance Schema maintains statement event summary tables that contain information about minimum, maximum, and average statement latency (see Section 29.12.20.3, “Statement Summary Tables”). To permit assessment at a more fine-grained ...
https://dev.mysql.com/doc/refman/9.7/en/date-and-time-literals.html
A DATETIME or TIMESTAMP value can include a trailing fractional seconds part in up to microseconds (6 digits) precision. A trailing fractional seconds part is recognized in the 'D hh:mm:ss.fraction', 'hh:mm:ss.fraction', 'hhmmss.fraction', and ...
https://dev.mysql.com/doc/refman/9.7/en/server-system-variables.html
timestamp is a DOUBLE rather than BIGINT because its value includes a microseconds part. The MySQL server maintains many system variables that affect its operation. Most system variables can be set at server startup using options on the command ...
https://dev.mysql.com/doc/refman/9.7/en/built-in-function-reference.html
The following table lists each built-in (native) function and operator and provides a short description of each one. For a table listing functions that are loadable at runtime, see Section 14.2, “Loadable Function Reference”. ->> Return value ...
https://dev.mysql.com/doc/refman/9.7/en/partitioning-limitations-functions.html
This section discusses limitations in MySQL Partitioning relating specifically to functions used in partitioning expressions. Each of these functions returns an integer only if it is passed an argument of an exact numeric type, such as one of the ...
https://dev.mysql.com/doc/refman/9.7/en/mysql-cluster-programs-ndb-mgmd.html
The management server is the process that reads the cluster configuration file and distributes this information to all nodes in the cluster that request it. Management clients can connect to the management server and check the cluster's status. All ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-error-log-table.html
Of the logs the MySQL server maintains, one is the error log to which it writes diagnostic messages (see Section 7.4.2, “The Error Log”). Typically, the server writes diagnostics to a file on the server host or to a system log service.
https://dev.mysql.com/doc/refman/9.7/en/optimizing-innodb-logging.html
Consider the following guidelines for optimizing redo logging: Increase the size of your redo log files. When InnoDB has written redo log files full, it must write the modified contents of the buffer pool to disk in a checkpoint. InnoDB tries to ...
https://dev.mysql.com/doc/refman/9.7/en/mysql-cluster-shm-definition.html
(NDB 9.7.0) 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 transmitted ...
https://dev.mysql.com/doc/refman/9.7/en/mysql-cluster-programs-ndbd.html
The ndbd binary provides the single-threaded version of the process that is used to handle all the data in tables employing the NDBCLUSTER storage engine. This data node process enables a data node to accomplish distributed transaction handling, ...