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https://dev.mysql.com/doc/refman/8.0/en/information-schema-schemata-extensions-table.html
The SCHEMATA_EXTENSIONS table (available as of MySQL 8.0.22) augments the SCHEMATA table with information about schema options. The SCHEMATA_EXTENSIONS table has these columns: CATALOG_NAME The name of the catalog to which the schema belongs. If ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-st-spatial-reference-systems-table.html
Entries in the ST_SPATIAL_REFERENCE_SYSTEMS table are based on the European Petroleum Survey Group (EPSG) data set, except for SRID 0, which corresponds to a special SRS used in MySQL that represents an infinite flat Cartesian plane with no units ...
https://dev.mysql.com/doc/refman/8.0/en/keyring-file-plugin.html
As of MySQL 8.0.34, this plugin is deprecated and subject to removal in a future release of MySQL. The keyring_file plugin supports the functions that comprise the standard MySQL Keyring service interface. The keyring_file keyring plugin stores ...
https://dev.mysql.com/doc/refman/8.0/en/keyring-service.html
MySQL Server supports a keyring service that enables internal components and plugins to securely store sensitive information for later retrieval. MySQL distributions provide a keyring interface that is accessible at two levels: At the SQL level, as ...As a C language interface, callable as a plugin service from server plugins or loadable ...
https://dev.mysql.com/doc/refman/8.0/en/monitor-alter-table-performance-schema.html
Enable the stage/innodb/alter% instruments: mysql> UPDATE performance_schema.setup_instruments SET ENABLED = 'YES' WHERE NAME LIKE 'stage/innodb/alter%'; Query OK, 7 rows affected (0.00 sec) Rows matched: 7 Changed: 7 Warnings: 0 Enable the stage ...
https://dev.mysql.com/doc/refman/8.0/en/option-modifiers.html
For example, the mysql client supports a --column-names option that determines whether or not to display a row of column names at the beginning of query results. However, you may want to disable it in some instances, such as when sending the output ... Some options are “boolean” and control behavior that can be turned on or ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-firewall-tables.html
Note The Performance Schema tables described here are available as of MySQL 8.0.23. Prior to MySQL 8.0.23, use the corresponding INFORMATION_SCHEMA tables instead; see MySQL Enterprise Firewall Tables. The following sections describe the ...They ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-table-characteristics.html
Many tables in the performance_schema database are read only and cannot be modified: mysql> TRUNCATE TABLE performance_schema.setup_instruments; ERROR 1683 (HY000): Invalid performance_schema usage. That might be useful, for example, after you have ... The name of the performance_schema database is lowercase, as are the names of tables within ...
https://dev.mysql.com/doc/refman/8.0/en/perl-support.html
Although earlier versions are available, they do not support the full functionality of MySQL 8.0. The Perl DBI module provides a generic interface for database access. You can write a DBI script that works with many different database engines ...
https://dev.mysql.com/doc/refman/8.0/en/precision-math-rounding.html
This section discusses precision math rounding for the ROUND() function and for inserts into columns with exact-value types (DECIMAL and integer). The ROUND() function rounds differently depending on whether its argument is exact or approximate: ...