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https://dev.mysql.com/doc/refman/5.7/en/innodb-memcached-developing.html
Coming from a database background, you might be used to general-purpose SQL tables with many columns. The tables accessed by memcached code likely have only a few or even a single column holding data values. Typically, writing an application for ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-multi-versioning.html
This information is stored in the system tablespace or undo tablespaces in a data structure called a rollback segment. Otherwise, InnoDB cannot discard data from the update undo logs, and the rollback segment may grow too big, filling up the ...It ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-performance-ro-txn.html
In this case, attempting to make changes to the database (for InnoDB, MyISAM, or other types of tables) causes an error, and the transaction continues in read-only state: ERROR 1792 (25006): Cannot execute statement in a READ ONLY transaction. You ... InnoDB can avoid the overhead associated with setting up the transaction ID (TRX_ID field) for transactions that are known to be ...
https://dev.mysql.com/doc/refman/5.7/en/insert-delayed.html
The DELAYED option for the INSERT statement is a MySQL extension to standard SQL. The server recognizes but ignores the DELAYED keyword, handles the insert as a nondelayed insert, and generates an ER_WARN_LEGACY_SYNTAX_CONVERTED warning: INSERT ...
https://dev.mysql.com/doc/refman/5.7/en/integer-types.html
The following table shows the required storage and range for each integer type. MySQL supports the SQL standard integer types INTEGER (or INT) and SMALLINT. As an extension to the standard, MySQL also supports the integer types TINYINT, MEDIUMINT, ...
https://dev.mysql.com/doc/refman/5.7/en/is-null-optimization.html
This optimization does not occur in cases when the column might produce NULL anyway (for example, if it comes from a table on the right side of a LEFT JOIN). MySQL can perform the same optimization on col_name IS NULL that it can use for col_name = ...
https://dev.mysql.com/doc/refman/5.7/en/json-modification-functions.html
MySQL recognizes the escape sequences shown in Table 12.23, “JSON_UNQUOTE() Special Character Escape Sequences”. The functions in this section modify JSON values and return the result. JSON_APPEND(json_doc, path, val[, path, val] ...) Appends ...
https://dev.mysql.com/doc/refman/5.7/en/ldml-collation-example.html
To add a UCA collation for a Unicode character set without recompiling MySQL, use the following procedure. If you are unfamiliar with the LDML rules used to describe the collation's sort characteristics, see Section 10.14.4.2, “LDML Syntax ...
https://dev.mysql.com/doc/refman/5.7/en/linux-installation-debian.html
Oracle provides Debian packages for installing MySQL on Debian or Debian-like Linux systems. The packages are available through two different channels: The MySQL APT Repository. This is the preferred method for installing MySQL on Debian-like ...
https://dev.mysql.com/doc/refman/5.7/en/linux-installation-native.html
The database tables are automatically created for you, if they do not already exist. * Checking for corrupt, not cleanly closed and upgrade needing tables. Many Linux distributions include a version of the MySQL server, client tools, and ...