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https://dev.mysql.com/doc/refman/8.0/en/data-type-defaults.html
Examples: CREATE TABLE t1 ( i INT DEFAULT -1, c VARCHAR(10) DEFAULT '', price DOUBLE(16,2) DEFAULT 0.00 ); SERIAL DEFAULT VALUE is a special case. Suppose that a table t is defined as follows: CREATE TABLE t (i INT NOT NULL); In this case, i has no ...An expression default value for one column can refer to other table columns, with the exception that references to generated columns or columns with expression default values must be to columns that occur earlier in the table ...
https://dev.mysql.com/doc/refman/8.0/en/replace.html
For information about generated columns, see Section 15.1.20.8, “CREATE TABLE and Generated Columns”. | TABLE table_name} value: {expr | DEFAULT} value_list: value [, value] ... REPLACE works exactly like INSERT, except that if an old row in the ... REPLACE [LOW_PRIORITY | DELAYED] [INTO] tbl_name [PARTITION (partition_name [, partition_name] ...)] [(col_name [, col_name] ...)] { {VALUES | VALUE} (value_list) [, (value_list)] ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-files-table.html
The Information Schema FILES table provides metadata about all InnoDB tablespace types including file-per-table tablespaces, general tablespaces, the system tablespace, temporary table tablespaces, and undo tablespaces (if present). For more ...
https://dev.mysql.com/doc/refman/8.0/en/myisam-optimization.html
To coalesce fragmented rows and eliminate wasted space that results from deleting or updating rows, run myisamchk in recovery mode: $> myisamchk -r tbl_name You can optimize a table in the same way by using the OPTIMIZE TABLE SQL statement.
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-server-operations.html
The server_operations table contains entries for all ongoing NDB operations that the current SQL node (MySQL Server) is currently involved in. It effectively is a subset of the cluster_operations table, in which operations for other SQL and API ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-transporters.html
In NDB 8.0.37 and later, you can obtain similar information about individual transporters from the transporter_details table. This information is shown in the table's status column, which can have any one of the following values: CONNECTING, ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndb-select-count.html
ndb_select_count prints the number of rows in one or more NDB tables. With a single table, the result is equivalent to that obtained by using the MySQL statement SELECT COUNT(*) FROM tbl_name. Usage ndb_select_count [-c connection_string] -ddb_name ...--connect-retries Command-Line Format --connect-retries=# Type Integer Default Value 12 Minimum Value 0 Maximum Value 12 Number of times to retry connection before giving ...
https://dev.mysql.com/doc/refman/8.0/en/binary-log-mysql-database.html
The contents of the grant tables in the mysql database can be modified directly (for example, with INSERT or DELETE) or indirectly (for example, with GRANT or CREATE USER). This pertains to statements such as GRANT, REVOKE, SET PASSWORD, RENAME ...
https://dev.mysql.com/doc/refman/8.0/en/sys-statements-with-temp-tables.html
memory_tmp_tables The total number of internal in-memory temporary tables created by occurrences of the statement. disk_tmp_tables The total number of internal on-disk temporary tables created by occurrences of the statement. These views list ...db ...
https://dev.mysql.com/doc/refman/8.0/en/proxy-users.html
For example: GRANT PROXY ON 'proxied_user' TO 'proxy_user'; The statement creates a row in the mysql.proxies_priv grant table. As an alternative to proxy users, DBAs may find that roles provide a suitable way to map users onto specific sets of named ...The plugin that authenticates a given connection may request that the connecting (external) user be treated as a different user for privilege-checking ...