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https://dev.mysql.com/doc/refman/8.0/en/cost-model.html
The primary key for the server_cost table is the cost_name column, so it is not possible to create multiple entries for any cost estimate. The server recognizes these cost_name values for the server_cost table: disk_temptable_create_cost, ...These ... To generate execution plans, the optimizer uses a cost model that is based on estimates of the cost of various operations that occur during query ...
https://dev.mysql.com/doc/refman/8.0/en/sys-table-exists.html
Tests whether a given table exists as a regular table, a TEMPORARY table, or a view. If both a temporary and a permanent table exist with the given name, TEMPORARY is returned. Parameters in_db VARCHAR(64): The name of the database in which to ...
https://dev.mysql.com/doc/refman/8.0/en/request-access.html
This is where the privilege columns in the grant tables come into play. These privileges can come from any of the user, global_grants, db, tables_priv, columns_priv, or procs_priv tables. (You may find it helpful to refer to Section 8.2.3, “Grant ... After the server accepts a connection, it enters Stage 2 of access ...
https://dev.mysql.com/doc/refman/8.0/en/implicit-commit.html
CREATE TABLE and DROP TABLE statements do not commit a transaction if the TEMPORARY keyword is used. (This does not apply to other operations on temporary tables such as ALTER TABLE and CREATE INDEX, which do cause a commit.) However, although no ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-processlist-table.html
As such, the implementation of SHOW PROCESSLIST which uses this table is also deprecated. For a comparison of this table with other sources, see Sources of Process Information. This is the same value displayed in the Id column of the SHOW ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-shell-tutorial-javascript-table-delete.html
You can use the delete() method to remove some or all records from a table in a database. All records matching the condition are deleted from the city table. mysql-js> db.city.delete().where("Name = 'Olympia'") Delete the First Record To delete the ...The X DevAPI provides additional methods to use with the delete() method to filter and order the records to be ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-shell-tutorial-python-table-delete.html
You can use the delete() method to remove some or all records from a table in a database. All records matching the condition are deleted from the city table. mysql-py> db.city.delete().where("Name = 'Olympia'") Delete the First Record To delete the ...The X DevAPI provides additional methods to use with the delete() method to filter and order the records to be ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-accounts-table.html
The accounts table contains a row for each account that has connected to the MySQL server. For each account, the table counts the current and total number of connections. To set the table size explicitly, set the performance_schema_accounts_size ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-hosts-table.html
The hosts table contains a row for each host from which clients have connected to the MySQL server. For each host name, the table counts the current and total number of connections. To set the table size explicitly, set the ...This is NULL for an ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-replication-connection-configuration-table.html
This table shows the configuration parameters used by the replica for connecting to the source. Parameters stored in the table can be changed at runtime with the CHANGE REPLICATION SOURCE TO statement (from MySQL 8.0.23) or CHANGE MASTER TO ...It ...