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https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-threads.html
The threads table provides information about threads running in the NDB kernel.
https://dev.mysql.com/doc/refman/8.0/en/optimizing-innodb-ddl-operations.html
Many DDL operations on tables and indexes (CREATE, ALTER, and DROP statements) can be performed online. Online DDL support for adding secondary indexes means that you can generally speed up the process of creating and loading a table and associated ...
https://dev.mysql.com/doc/refman/8.0/en/creating-accounts.html
Account-management statements cause the server to make appropriate modifications to the underlying grant tables, which are discussed in Section 8.2.3, “Grant Tables”. Note Direct modification of grant tables using statements such as INSERT, ...
https://dev.mysql.com/doc/refman/8.0/en/ddl-rewriter.html
MySQL 8.0.16 and higher includes a ddl_rewriter plugin that modifies CREATE TABLE statements received by the server before it parses and executes them. The plugin removes ENCRYPTION, DATA DIRECTORY, and INDEX DIRECTORY clauses, which may be helpful ...For example, the plugin may enable restoring such dump files into an unencrypted instance or in an environment where the paths outside the data directory are not ...
https://dev.mysql.com/doc/refman/8.0/en/faqs-storage-engines.html
Where can I obtain complete documentation for MySQL storage engines? See Chapter 18, Alternative Storage Engines. partition is also no longer displayed in the output of SHOW PLUGINS, or shown in the INFORMATION_SCHEMA.PLUGINS table. In order to ...
https://dev.mysql.com/doc/refman/8.0/en/group-by-optimization.html
The most general way to satisfy a GROUP BY clause is to scan the whole table and create a new temporary table where all rows from each group are consecutive, and then use this temporary table to discover groups and apply aggregate functions (if ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-buffer-pool.html
The buffer pool is an area in main memory where InnoDB caches table and index data as it is accessed. A table scan, performed for a mysqldump operation or a SELECT statement with no WHERE clause, for example, can bring a large amount of data into ...The buffer pool permits frequently used data to be accessed directly from memory, which speeds up ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-change-buffer.html
On disk, the change buffer is part of the system tablespace, where index changes are buffered when the database server is shut down. Configuring Change Buffering When INSERT, UPDATE, and DELETE operations are performed on a table, the values of ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-multiple-get-range-query.html
The example uses the test.city table described in Creating a New Table and Column Mapping. For example, the table switch in this example is valid: get @@aaa.AA BB VALUE @@aaa.AA 8 12 HELLO, HELLO VALUE BB 10 16 GOODBYE, GOODBYE END Attempting to ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-replication.html
source $> mysqldump --all-databases --lock-all-tables > dbdump.db replica $> mysql < dbdump.db On the source server, issue SHOW MASTER STATUS to obtain the source binary log coordinates. The example uses the demo_test table, which was created by the ... Because the daemon_memcached plugin supports the MySQL binary log, source server through the memcached interface can be replicated for backup, balancing intensive read workloads, and high ...