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https://dev.mysql.com/doc/refman/8.4/en/faqs-migration.html
Where can I find information on how to upgrade or downgrade MySQL? A.8.1. Where can I find information on how to upgrade or downgrade MySQL? For detailed upgrade information, see Chapter 3, Upgrading MySQL. Do not skip a major version when ...
https://dev.mysql.com/doc/refman/8.4/en/fetch.html
This statement fetches the next row for the SELECT statement associated with the specified cursor (which must be open), and advances the cursor pointer. If a row exists, the fetched columns are stored in the named variables. The number of columns ...
https://dev.mysql.com/doc/refman/8.4/en/file-permissions.html
If you have problems with file permissions, the UMASK or UMASK_DIR environment variable might be set incorrectly when mysqld starts. For example, mysqld might issue the following error message when you create a table: ERROR: Can't find file: ...
https://dev.mysql.com/doc/refman/8.4/en/firewall-information-schema-tables.html
The following sections describe the INFORMATION_SCHEMA tables associated with MySQL Enterprise Firewall (see Section 8.4.7, “MySQL Enterprise Firewall”). These tables are available only if the appropriate firewall plugins are enabled.
https://dev.mysql.com/doc/refman/8.4/en/firewall.html
Note MySQL Enterprise Firewall is an extension included in MySQL Enterprise Edition, a commercial product. MySQL Enterprise Edition includes MySQL Enterprise Firewall, an application-level firewall that enables database administrators to permit or ...
https://dev.mysql.com/doc/refman/8.4/en/fixed-point-types.html
The DECIMAL and NUMERIC types store exact numeric data values. These types are used when it is important to preserve exact precision, for example with monetary data. In MySQL, NUMERIC is implemented as DECIMAL, so the following remarks about ...
https://dev.mysql.com/doc/refman/8.4/en/floating-point-types.html
The FLOAT and DOUBLE types represent approximate numeric data values. MySQL uses four bytes for single-precision values and eight bytes for double-precision values. For FLOAT, the SQL standard permits an optional specification of the precision (but ...
https://dev.mysql.com/doc/refman/8.4/en/fractional-seconds.html
MySQL has fractional seconds support for TIME, DATETIME, and TIMESTAMP values, with up to microseconds (6 digits) precision: To define a column that includes a fractional seconds part, use the syntax type_name(fsp), where type_name is TIME, ...
https://dev.mysql.com/doc/refman/8.4/en/full-disk.html
This section describes how MySQL responds to disk-full errors (such as “no space left on device”), and to quota-exceeded errors (such as “write failed” or “user block limit reached”). If there is enough space, it continues as if nothing ...
https://dev.mysql.com/doc/refman/8.4/en/full-table.html
If a table-full error occurs, it may be that the disk is full or that the table has reached its maximum size. The effective maximum table size for MySQL databases is usually determined by operating system constraints on file sizes, not by MySQL ...