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https://dev.mysql.com/doc/refman/8.0/en/innodb-online-ddl-space-requirements.html
Temporary log files: A temporary log file records concurrent DML when an online DDL operation creates an index or alters a table. Temporary sort files: Online DDL operations that rebuild the table write temporary sort files to the MySQL temporary ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-redo-log.html
If InnoDB detects that the innodb_log_file_size differs from the redo log file size, it writes a log checkpoint, closes and removes the old log files, creates new log files at the requested size, and opens the new log files. The redo log is a ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-transaction-isolation-levels.html
This is because a non-locking SELECT statement presents the state of the database from a read view which consists of transactions committed before the read view was created, and before the current transaction's own writes, while the locking ...
https://dev.mysql.com/doc/refman/8.0/en/ipv6-local-connections.html
As an administrator, connect to the server and create an account for a local user who can connect from the ::1 local IPv6 host address: mysql> CREATE USER 'ipv6user'@'::1' IDENTIFIED BY 'ipv6pass'; For the permitted syntax of IPv6 addresses in ...
https://dev.mysql.com/doc/refman/8.0/en/json-table-functions.html
This is equivalent to specifying a column as AUTO_INCREMENT in a CREATE TABLE statement, and can be used to distinguish parent rows with the same value for multiple rows generated by a NESTED [PATH] clause. This section contains information about ...
https://dev.mysql.com/doc/refman/8.0/en/limit-optimization.html
If you need only a specified number of rows from a result set, use a LIMIT clause in the query, rather than fetching the whole result set and throwing away the extra data. MySQL sometimes optimizes a query that has a LIMIT row_count clause and no ...
https://dev.mysql.com/doc/refman/8.0/en/local-variable-scope.html
Because local variables are in scope only during stored program execution, references to them are not permitted in prepared statements created within a stored program. The scope of a local variable is the BEGIN ... The variable can be referred to ...
https://dev.mysql.com/doc/refman/8.0/en/multiple-column-indexes.html
MySQL can create composite indexes (that is, indexes on multiple columns). A multiple-column index can be considered a sorted array, the rows of which contain values that are created by concatenating the values of the indexed columns. For certain ...
https://dev.mysql.com/doc/refman/8.0/en/multiple-tables.html
Given these considerations, the CREATE TABLE statement for the event table might look like this: mysql> CREATE TABLE event (name VARCHAR(20), date DATE, type VARCHAR(15), remark VARCHAR(255)); As with the pet table, it is easiest to load the initial ... The pet table keeps track of which pets you ...
https://dev.mysql.com/doc/refman/8.0/en/myisam-table-formats.html
The third, compressed format, can be created only with the myisampack utility (see Section 6.6.6, “myisampack — Generate Compressed, Read-Only MyISAM Tables”). When you use CREATE TABLE or ALTER TABLE for a table that has no BLOB or TEXT ...