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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-status-monitoring.html
Performance_schema_xxx_instances_lost indicates how many instances of object type xxx could not be created. If the server cannot create a given instrumented mutex instance, it increments Performance_schema_mutex_instances_lost. The server allocates ...Names for these variables have several forms: Performance_schema_xxx_classes_lost indicates how many instruments of type xxx could not be ...
https://dev.mysql.com/doc/refman/8.0/en/system-schema.html
Previously, these tables were created in individual tablespace files in the mysql database directory. The change of grant-table storage engine underlies an accompanying change in MySQL 8.0 to the behavior of account-management statements such as ...
https://dev.mysql.com/doc/refman/8.0/en/audit-log-reference.html
Audit Log Functions This section describes, for each audit log function, its purpose, calling sequence, and return value. With an argument consisting of a JSON null value, audit_log_read() closes the current read sequence. If present, the argument ...Unless those objects are installed, the audit_log plugin operates in legacy mode (deprecated in MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/data-masking-plugin-installation.html
This section describes how to install or uninstall MySQL Enterprise Data Masking and De-Identification, which is implemented as a plugin library file containing a plugin and several loadable functions. For general information about installing or ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-events-table.html
DEFINER The account named in the DEFINER clause (often the user who created the event), in 'user_name'@'host_name' format. EXECUTE_AT For a one-time event, this is the DATETIME value specified in the AT clause of the CREATE EVENT statement used to ... The EVENTS table provides information about Event Manager events, which are discussed in Section 27.4, “Using the Event ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndb-desc.html
Three of the table properties that can be set using NDB_TABLE comments embedded in CREATE TABLE and ALTER TABLE statements are also visible in ndb_desc output. You can check that the ALTER TABLE statement has the desired effect using SHOW CREATE ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-handling-nulls.html
We can verify this behavior by examining the effects on the file system of creating a table partitioned by HASH and populating it with a record containing appropriate values. Partitioning in MySQL does nothing to disallow NULL as the value of a ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-overview.html
For more information about permitted partitioning column types and partitioning functions, see Section 26.2, “Partitioning Types”, as well as Section 15.1.20, “CREATE TABLE Statement”, which provides partitioning syntax descriptions and ...
https://dev.mysql.com/doc/refman/8.0/en/timestamp-initialization.html
CREATE TABLE t1 ( ts TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, dt DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ); With a DEFAULT clause but no ON UPDATE CURRENT_TIMESTAMP clause, the column has the given ...
https://dev.mysql.com/doc/refman/8.0/en/windows-symbolic-links.html
To do this, create a symbolic link in the MySQL data directory that points to D:\data\mydb. However, before creating the symbolic link, make sure that the D:\data\mydb directory exists by creating it if necessary. On Windows, you can create a ... On ...