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https://dev.mysql.com/doc/refman/5.7/en/subquery-optimization.html
Note A limitation on UPDATE and DELETE statements that use a subquery to modify a single table is that the optimizer does not use semijoin or materialization subquery optimizations. As a workaround, try rewriting them as multiple-table UPDATE and ...
https://dev.mysql.com/doc/refman/5.7/en/sys-io-global-by-file-by-bytes.html
total The total number of bytes read and written for the file. These views summarize global I/O consumers to display amount of I/O, grouped by file. By default, rows are sorted by descending total I/O (bytes read and written). The ...
https://dev.mysql.com/doc/refman/5.7/en/working-with-null.html
The NULL value can be surprising until you get used to it. Conceptually, NULL means “a missing unknown value” and it is treated somewhat differently from other values. In MySQL, 0 or NULL means false and anything else means true. This special ...
https://dev.mysql.com/doc/refman/5.7/en/myisam-ftdump.html
--dump, -d Command-Line Format --dump Dump the index, including data offsets and word weights. Before using myisam_ftdump, be sure to issue a FLUSH TABLES statement first if the server is running. If you do not invoke myisam_ftdump in the directory ...It reads the MyISAM index file directly, so it must be run on the server host where the table is ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-enterprise-backup.html
MySQL Enterprise Backup performs hot backup operations for MySQL databases. Hot backups are performed while the database is running and applications are reading and writing to it. For these reasons, hot backups are desirable when your database ...
https://dev.mysql.com/doc/refman/5.7/en/firewall-installation.html
$> mysql -u root -p < linux_install_firewall.sql Enter password: (enter root password here) Note As of MySQL 5.7.21, for a new installation of MySQL Enterprise Firewall, InnoDB is used instead of MyISAM for the firewall tables. Installation can be ... MySQL Enterprise Firewall installation is a one-time operation that installs the elements described in Section 6.4.6.1, “Elements of MySQL Enterprise ...
https://dev.mysql.com/doc/refman/5.7/en/document-store-concepts.html
Mogae", "GovernmentForm": "Republic" }, "demographics": { "Population": 1622000, "LifeExpectancy": 39.29999923706055 } } Collection A Collection is a container that may be used to store Documents in a MySQL database. CRUD Operations Create, Read, ...
https://dev.mysql.com/doc/refman/5.7/en/downgrade-before-you-begin.html
Before downgrading, reverse changes resulting from the use of new features and remove configuration settings that are not supported by the release you are downgrading to. The backup should include the mysql database, which contains the MySQL system ...Review Section 2.11.2, “Downgrade Paths” to ensure that your intended downgrade path is ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-install-configuration.html
Since the "world" database takes up # only about 500KB, this should be more than enough for # this example NDB Cluster setup. For our four-node, four-host NDB Cluster (see Cluster nodes and host computers), it is necessary to write four ... In this ...
https://dev.mysql.com/doc/refman/5.7/en/optimization.html
This chapter explains how to optimize MySQL performance and provides examples. Depending on your job role (developer, DBA, or a combination of both), you might optimize at the level of individual SQL statements, entire applications, a single ...