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https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-examples-compression-sect.html
Compressing or uncompressing pages has consumed less than a second since the time the statistics were reset, because the columns COMPRESS_TIME and UNCOMPRESS_TIME are zero. This copying of SUM(PAGE_SIZE*RELOCATION_OPS) bytes has consumed less than a ... Example 17.1 Using the Compression Information Schema Tables The following is sample output from a database that contains compressed tables (see Section 17.9, “InnoDB Table and Page Compression”, INNODB_CMP, INNODB_CMP_PER_INDEX, and ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-setup.html
mysql> source MYSQL_HOME/share/innodb_memcached_config.sql Running the innodb_memcached_config.sql script is a one-time operation. Activate the daemon_memcached plugin by running the INSTALL PLUGIN statement: mysql> INSTALL PLUGIN daemon_memcached ... This section describes how to set up the daemon_memcached plugin on a MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-txn.html
When a memcached operation inserts, updates, or deletes data in the underlying InnoDB table, the change might be committed to the InnoDB table instantly (if daemon_memcached_w_batch_size=1) or some time later (if the daemon_memcached_w_batch_size ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-online-ddl-operations.html
A newly created secondary index contains only the committed data in the table at the time the CREATE INDEX or ALTER TABLE statement finishes executing. When you add a primary key using the ALGORITHM=COPY clause, MySQL converts NULL values in the ...
https://dev.mysql.com/doc/refman/8.0/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/8.0/en/innodb-statistics-estimation.html
To improve the start up time of the mysql client and to updating statistics, you can turn off auto-rehash using the --disable-auto-rehash option. InnoDB detects that 1 / 16 of table has been modified since the last time statistics were updated.
https://dev.mysql.com/doc/refman/8.0/en/keyring-hashicorp-plugin.html
Note The operations described in this step are required only when starting Vault the first time, to obtain the unseal key and root token. Note The operations described in this step are needed only the first time the Vault instance is run. Note The ... Note The keyring_hashicorp plugin is an extension included in MySQL Enterprise Edition, a commercial ...
https://dev.mysql.com/doc/refman/8.0/en/keyring-system-variables.html
If an attempted runtime assignment to keyring_encrypted_file_data results in an error, the variable value remains unchanged. The password value cannot be displayed at runtime with SHOW VARIABLES or the Performance Schema global_variables table ...
https://dev.mysql.com/doc/refman/8.0/en/lateral-derived-tables.html
A derived table cannot normally refer to (depend on) columns of preceding tables in the same FROM clause. As of MySQL 8.0.14, a derived table may be defined as a lateral derived table to specify that such references are permitted. Nonlateral ...
https://dev.mysql.com/doc/refman/8.0/en/log-file-maintenance.html
When using MySQL with logging enabled, you may want to back up and remove old log files from time to time and tell MySQL to start logging to new files. If you are using replication, you should specify an expiration period that is no lower than the ... As described in Section 7.4, “MySQL Server Logs”, MySQL Server can create several different log files to help you see what activity is taking ...