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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-threads-table.html
The threads table contains a row for each server thread. Each row contains information about a thread and indicates whether monitoring and historical event logging are enabled for it: mysql> SELECT * FROM performance_schema.threads\G ...
https://dev.mysql.com/doc/refman/8.0/en/problems-with-null.html
The concept of the NULL value is a common source of confusion for newcomers to SQL, who often think that NULL is the same thing as an empty string ''. For example, the following statements are completely different: mysql> INSERT INTO my_table ...
https://dev.mysql.com/doc/refman/8.0/en/query-log.html
The general query log is a general record of what mysqld is doing. The server writes information to this log when clients connect or disconnect, and it logs each SQL statement received from clients. The general query log can be very useful when you ...
https://dev.mysql.com/doc/refman/8.0/en/repair-table.html
[QUICK] [EXTENDED] [USE_FRM] REPAIR TABLE repairs a possibly corrupted table, for certain storage engines only. Although normally you should never have to run REPAIR TABLE, if disaster strikes, this statement is very likely to get back all your data ...
https://dev.mysql.com/doc/refman/8.0/en/replication-administration-status.html
The most common task when managing a replication process is to ensure that replication is taking place and that there have been no errors between the replica and the source. The SHOW REPLICA STATUS statement, which you must execute on each replica, ...
https://dev.mysql.com/doc/refman/8.0/en/replication-features-auto-increment.html
Statement-based replication of AUTO_INCREMENT, LAST_INSERT_ID(), and TIMESTAMP values is carried out subject to the following exceptions: A statement invoking a trigger or function that causes an update to an AUTO_INCREMENT column is not replicated ...
https://dev.mysql.com/doc/refman/8.0/en/replication-features-fractional-seconds.html
MySQL 8.0 permits fractional seconds for TIME, DATETIME, and TIMESTAMP values, with up to microseconds (6 digits) precision.
https://dev.mysql.com/doc/refman/8.0/en/replication-features-timeout.html
The global value of the system variable replica_transaction_retries (from MySQL 8.0.26) or slave_transaction_retries (before MySQL 8.0.26) sets the maximum number of times for applier threads on a single-threaded or multithreaded replica to ...
https://dev.mysql.com/doc/refman/8.0/en/replication-features-variables.html
sql_mode is also replicated except for the NO_DIR_IN_CREATE mode; the replica always preserves its own value for NO_DIR_IN_CREATE, regardless of changes to it on the source. However, when mysqlbinlog parses a SET @@sql_mode = mode statement, the ...
https://dev.mysql.com/doc/refman/8.0/en/server-option-variable-reference.html
The following table lists all command-line options, system variables, and status variables applicable within mysqld. The table lists command-line options (Cmd-line), options valid in configuration files (Option file), server system variables ...