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https://dev.mysql.com/doc/refman/8.0/en/sys-statement-performance-analyzer.html
Example To create a report with the queries in the 95th percentile since the last truncation of events_statements_summary_by_digest and with a one-minute delta period: Create a temporary table to store the initial snapshot. Creates a report of the ...
https://dev.mysql.com/doc/refman/8.0/en/clone-plugin-options-variables.html
This section describes the system variables that control operation of the clone plugin. If values specified at startup are incorrect, the clone plugin may fail to initialize properly and the server does not load it. In this case, the server may ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-backup-using-management-client.html
Before starting a backup, make sure that the cluster is properly configured for performing one. If an existing backup_id value is used, the backup fails with the error Backup failed: file already exists. If used, the backup_id must follow ...
https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html
log_throttle_queries_not_using_indexes Command-Line Format --log-throttle-queries-not-using-indexes=# System Variable log_throttle_queries_not_using_indexes Scope Global Dynamic Yes SET_VAR Hint Applies No Type Integer Default Value 0 Minimum Value ... The MySQL server maintains many system variables that affect its ...
https://dev.mysql.com/doc/refman/8.0/en/replication-options-replica.html
This section explains the server options and system variables that apply to replica servers and contains the following: Startup Options for Replica Servers System Variables Used on Replica Servers Specify the options either on the command line or ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-responses-failure-rejoin.html
From MySQL 8.0.21, the value of the system variable defaults to 3, meaning that the member automatically makes 3 attempts to rejoin the group, with 5 minutes between each. After an unsuccessful auto-rejoin attempt, the member waits 5 minutes before ... The group_replication_autorejoin_tries system variable, which is available from MySQL 8.0.16, makes a member that has been expelled or reached its unreachable majority timeout try to rejoin the group ...
https://dev.mysql.com/doc/refman/8.0/en/time.html
For example, you might think of '1112' and 1112 as meaning '11:12:00' (12 minutes after 11 o'clock), but MySQL interprets them as '00:11:12' (11 minutes, 12 seconds). MySQL retrieves and displays TIME values in 'hh:mm:ss' format (or 'hhh:mm:ss' ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-functions.html
It may be used instead of the sys schema format_time() function, keeping in mind these differences: To indicate minutes, sys.format_time() uses the m units indicator, whereas FORMAT_PICO_TIME() uses min. As of MySQL 8.0.16, MySQL includes built-in ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-statement-digests.html
The MySQL server is capable of maintaining statement digest information. The digesting process converts each SQL statement to normalized form (the statement digest) and computes a SHA-256 hash value (the digest hash value) from the normalized ...
https://dev.mysql.com/doc/refman/8.0/en/windows-restrictions.html
Limited number of ports Windows systems have about 4,000 ports available for client connections, and after a connection on a port closes, it takes two to four minutes before the port can be reused. The following restrictions apply to use of MySQL ...