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https://dev.mysql.com/doc/refman/8.0/en/condition-filtering.html
In join processing, prefix rows are those rows passed from one table in a join to the next. In general, the optimizer attempts to put tables with low prefix counts early in the join order to keep the number of row combinations from increasing ...
https://dev.mysql.com/doc/refman/8.0/en/intersect.html
query_expression_body INTERSECT [ALL | DISTINCT] query_expression_body [INTERSECT [ALL | DISTINCT] query_expression_body] [...] query_expression_body: See Section 15.2.14, “Set Operations with UNION, INTERSECT, and EXCEPT” INTERSECT limits the ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-consumer-configurations.html
The consumer settings in the setup_consumers table form a hierarchy from higher levels to lower. The setup_consumers table contains the following hierarchy of values: global_instrumentation thread_instrumentation events_waits_current ...The ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-files.html
The files table is empty if no disk data objects have been created in NDB. See Section 25.6.11.1, “NDB Cluster Disk Data Objects”, for more information.
https://dev.mysql.com/doc/refman/8.0/en/mysqlimport.html
Here is a sample session that demonstrates use of mysqlimport: $> mysql -e 'CREATE TABLE imptest(id INT, n VARCHAR(30))' test $> ed a 100 Max Sydow 101 Count Dracula . Invoke mysqlimport like this: mysqlimport [options] db_name textfile1 [textfile2 ... The mysqlimport client provides a command-line interface to the LOAD DATA SQL ...
https://dev.mysql.com/doc/refman/8.0/en/stored-objects-security.html
If a definition omits the DEFINER attribute, the default object definer is the user who creates it. Creating a stored object with a nonexistent DEFINER account creates an orphan object, which may have negative consequences; see Orphan Stored Objects. This account must have the EXECUTE privilege for p1 as well as the UPDATE privilege for the table t1 referenced within the object ... Stored programs (procedures, functions, triggers, ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-tablespace-autoextend-size.html
When a file-per-table or general tablespace is created with a non-zero AUTOEXTEND_SIZE setting, the tablespace is initialized at the specified AUTOEXTEND_SIZE size. For tables created in file-per-table tablespaces, SHOW CREATE TABLE shows the ... By ...For information about extent size, see Section 17.11.2, “File Space ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-deadlocks-handling.html
Another way to serialize transactions is to create an auxiliary “semaphore” table that contains just a single row. When modifying multiple tables within a transaction, or different sets of rows in the same table, do those operations in a ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-txn.html
This option is less appropriate when accessing the same tables through both memcached and SQL, because it blocks CREATE INDEX statements on the tables, which could be important for running reporting queries. Although the default behavior does not ...
https://dev.mysql.com/doc/refman/8.0/en/keyring-system-variables.html
(It is permissible to rename or move the file, as long as you change the value of keyring_file_data to match.) It is recommended that you create a separate backup of the keyring data file immediately after you create the first encrypted table and ...