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https://dev.mysql.com/doc/refman/8.0/en/insert-on-duplicate.html
If you specify an ON DUPLICATE KEY UPDATE clause and a row to be inserted would cause a duplicate value in a UNIQUE index or PRIMARY KEY, an UPDATE of the old row occurs. If column b is also unique, the INSERT is equivalent to this UPDATE statement ...
https://dev.mysql.com/doc/refman/8.0/en/ipv6-brokers.html
If you do not have a public IPv6 address that enables your system to communicate over IPv6 outside your local network, you can obtain one from an IPv6 broker. The Wikipedia IPv6 Tunnel Broker page lists several brokers and their features, such as ...
https://dev.mysql.com/doc/refman/8.0/en/ipv6-system-support.html
Before MySQL Server can accept IPv6 connections, the operating system on your server host must support IPv6. As a simple test to determine whether that is true, try this command: $> ping6 ::1 16 bytes from ::1, icmp_seq=0 hlim=64 time=0.171 ms 16 ...
https://dev.mysql.com/doc/refman/8.0/en/json-attribute-functions.html
The functions in this section return attributes of JSON values. An error occurs if the argument is not a valid JSON document. An empty array, empty object, or scalar value has depth 1. A nonempty array containing only elements of depth 1 or ...
https://dev.mysql.com/doc/refman/8.0/en/json-table-functions.html
This section contains information about JSON functions that convert JSON data to tabular data. JSON_TABLE(expr, path COLUMNS (column_list) [AS] alias) Extracts data from a JSON document and returns it as a relational table having the specified ...
https://dev.mysql.com/doc/refman/8.0/en/linux-installation-yum-repo.html
Before You Start As a popular, open-source software, MySQL, in its original or re-packaged form, is widely installed on many systems from various sources, including different software download sites, software repositories, and so on. The following ...
https://dev.mysql.com/doc/refman/8.0/en/load-data-local-security.html
The LOAD DATA statement loads a data file into a table. The statement can load a file located on the server host, or, if the LOCAL keyword is specified, on the client host. In theory, a patched server could tell the client program to transfer a ...
https://dev.mysql.com/doc/refman/8.0/en/locking-service.html
MySQL distributions provide a locking interface that is accessible at two levels: At the SQL level, as a set of loadable functions that each map onto calls to the service routines. As a C language interface, callable as a plugin service from server ...
https://dev.mysql.com/doc/refman/8.0/en/midpoint-insertion.html
By default, the key cache management system uses a simple LRU strategy for choosing key cache blocks to be evicted, but it also supports a more sophisticated method called the midpoint insertion strategy. When using the midpoint insertion strategy, ...
https://dev.mysql.com/doc/refman/8.0/en/myisam-crash-recovery.html
This section describes how to check for and deal with data corruption in MySQL databases. If your tables become corrupted frequently, you should try to find the reason why. For an explanation of how MyISAM tables can become corrupted, see Section ...