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https://dev.mysql.com/doc/refman/9.7/en/performance-schema-timing.html
The idle, stage, statement, and transaction timers use NANOSECOND on platforms where the NANOSECOND timer is available, MICROSECOND otherwise. If the processor runs at 1 GHz (one billion cycles/second) or higher, the cycle counter delivers ...
https://dev.mysql.com/doc/refman/9.7/en/string-functions.html
mysql> SELECT CONCAT_WS(',', 'First name', 'Second name', 'Last Name'); -> 'First name,Second name,Last Name' mysql> SELECT CONCAT_WS(',', 'First name', NULL, 'Last Name'); -> 'First name,Last Name' CONCAT_WS() does not skip empty strings. If the ...
https://dev.mysql.com/doc/refman/9.7/en/innodb-standard-monitor.html
Status This section shows the timestamp, the monitor name, and the number of seconds that per-second averages are based on. The number of seconds is the elapsed time between the current time and the last time InnoDB Monitor output was printed. The ...
https://dev.mysql.com/doc/refman/9.7/en/slow-query-log.html
The slow query log consists of SQL statements that take more than long_query_time seconds to execute and require at least min_examined_row_limit rows to be examined. The first such query opens a 60-second window within which the server logs queries ...The slow query log can be used to find queries that take a long time to execute and are therefore candidates for ...
https://dev.mysql.com/doc/refman/9.7/en/storage-requirements.html
DATETIME is packed more efficiently, requiring 5 rather than 8 bytes for the nonfractional part, and all three parts have a fractional part that requires from 0 to 3 bytes, depending on the fractional seconds precision of stored values. Fractional ... InnoDB Table Storage Requirements NDB Table Storage Requirements Numeric Type Storage Requirements Date and Time Type Storage Requirements String Type Storage Requirements Spatial Type Storage Requirements JSON Storage Requirements The storage requirements for table data on disk depend on several ...
https://dev.mysql.com/doc/refman/9.7/en/sys-diagnostics.html
Parameters in_max_runtime INT UNSIGNED: The maximum data collection time in seconds. Use NULL to collect data for the default of 60 seconds. in_interval INT UNSIGNED: The sleep time between data collections in seconds. Creates a report of the ...
https://dev.mysql.com/doc/refman/9.7/en/time.html
MySQL recognizes TIME values in several formats, some of which can include a trailing fractional seconds part in up to microseconds (6 digits) precision. For information about fractional seconds support in MySQL, see Section 13.2.6, “Fractional ...
https://dev.mysql.com/doc/refman/9.7/en/alter-user.html
Statements that modify secondary passwords require these privileges: The APPLICATION_PASSWORD_ADMIN privilege is required to use the RETAIN CURRENT PASSWORD or DISCARD OLD PASSWORD clause for ALTER USER statements that apply to your own account. The ... ALTER USER [IF EXISTS] user [auth_option] [, user [auth_option]] ...
https://dev.mysql.com/doc/refman/9.7/en/check-table.html
A table is reported as needing a rebuild if it contains old temporal columns in pre-5.6.4 format (TIME, DATETIME, and TIMESTAMP columns without support for fractional seconds precision). If the corruption occurs in a secondary index but table data ...option: { FOR UPGRADE | QUICK | FAST | MEDIUM | EXTENDED | CHANGED } CHECK TABLE checks a table or tables for ...
https://dev.mysql.com/doc/refman/9.7/en/datetime.html
A DATETIME or TIMESTAMP value can include a trailing fractional seconds part in up to microseconds (6 digits) precision. The fractional part should always be separated from the rest of the time by a decimal point; no other fractional seconds ...This ...