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https://dev.mysql.com/doc/refman/9.7/en/mysql-cluster-ndbinfo-transporter-details.html
sendbuffer_max_used_bytes The maximum amount, in bytes, of signal data awaiting send at any one time by this transporter. sendbuffer_max_alloc_bytes Maxmimum amount of send buffer, in bytes, allocated for signal data storage at any one time for this ... This table contains information about individual NDB transporters, rather than aggregate information as shown by the transporters ...
https://dev.mysql.com/doc/refman/9.7/en/mysql-cluster-programs-ndb-index-stat.html
--connect-retries Command-Line Format --connect-retries=# Type Integer Default Value 12 Minimum Value 0 Maximum Value 12 Number of times to retry connection before giving up. --loops=# Command-Line Format --loops=# Type Numeric Default Value 0 ...
https://dev.mysql.com/doc/refman/9.7/en/optimize-overview.html
As you work on database performance, you start by learning the high-level rules and guidelines for the software side, and measuring performance using wall-clock time. It takes time for the disk to find a piece of data. With modern disks, the mean ...
https://dev.mysql.com/doc/refman/9.7/en/optimizer-hints.html
Conflicting hints In some cases hints can conflict, such as when JOIN_ORDER and JOIN_PREFIX have table orders that are impossible to apply at the same time: SELECT /*+ JOIN_ORDER(t1, t2) JOIN_PREFIX(t2, t1) */ ... Statement Execution Time Optimizer ... One means of control over optimizer strategies is to set the optimizer_switch system variable (see Section 10.9.2, “Switchable ...
https://dev.mysql.com/doc/refman/9.7/en/optimizing-innodb-configuration-variables.html
Different settings work best for servers with light, predictable loads, versus servers that are running near full capacity all the time, or that experience spikes of high activity. Preventing one-time operations such as table scans from interfering ...Because the InnoDB storage engine performs many of its optimizations automatically, many performance-tuning tasks involve monitoring to ensure that the database is performing well, and changing configuration options when performance ...
https://dev.mysql.com/doc/refman/9.7/en/partitioning-range.html
You want to use a column containing date or time values, or containing values arising from some other series. (See Bug #42849.) Note It is also possible in MySQL 9.7 to use UNIX_TIMESTAMP(timestamp_column) as a partitioning expression for tables ...
https://dev.mysql.com/doc/refman/9.7/en/partitioning-types.html
However, it is not difficult in MySQL to create partitioning schemes based on DATE, TIME, or DATETIME columns, or based on expressions making use of such columns. When partitioning by KEY or LINEAR KEY, you can use a DATE, TIME, or DATETIME column ... This section discusses the types of partitioning which are available in MySQL ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-component-scheduler-tasks-table.html
Does a periodic refresh of the audit log in-memory rules cache by calling audit_log_flush INTERVAL_SECONDS: 100 TIMES_RUN: 5 TIMES_FAILED: 0 1 row in set (0.02 sec) The component_scheduler_tasks table has the following columns: NAME The name ... The ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-functions.html
FORMAT_PICO_TIME(time_val) Given a numeric Performance Schema latency or wait time in picoseconds, converts it to human-readable format and returns a string consisting of a value and a units indicator. The string contains the decimal time rounded to ... MySQL includes built-in SQL functions that format or retrieve Performance Schema data, and that may be used as equivalents for the corresponding sys schema stored ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-setup-objects-table.html
The order in which matching occurs matters because different matching setup_objects rows can have different ENABLED and TIMED values. For existing rows, only the ENABLED and TIMED columns can be modified, by users with the UPDATE privilege on the ...