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https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-txn.html
The interval is controlled by the innodb_api_bk_commit_interval configuration option, which has a default setting of 5 seconds. Unlike traditional memcached, the daemon_memcached plugin allows you to control durability of data values produced ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-migration.html
Start a second mysqld server on the backup and let it clean up the .ibd files in the backup. This section describes techniques for moving or copying some or all InnoDB tables to a different server or instance. For example, you might move an entire ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-next-key-locking.html
For example, if a SELECT is executed twice, but returns a row the second time that was not returned the first time, the row is a “phantom” row. The so-called phantom problem occurs within a transaction when the same query produces different ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-performance-compression-oltp.html
The rise of SSD storage devices, which are fast but relatively small and expensive, makes compression attractive also for OLTP workloads: high-traffic, interactive websites can reduce their storage requirements and their I/O operations per second ...
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/invisible-columns.html
The second SELECT explicitly references col2, so the column appears in the result. An invisible column is normally hidden to queries, but can be accessed if explicitly referenced. As an illustration of when invisible columns may be useful, suppose ...
https://dev.mysql.com/doc/refman/8.0/en/json-function-reference.html
Table 14.22 JSON Functions Name Description Deprecated -> Return value from JSON column after evaluating path; equivalent to JSON_EXTRACT(). ->> Return value from JSON column after evaluating path and unquoting the result; equivalent to ...
https://dev.mysql.com/doc/refman/8.0/en/json-search-functions.html
The functions in this section perform search or comparison operations on JSON values to extract data from them, report whether data exists at a location within them, or report the path to data within them. JSON_CONTAINS(target, candidate[, path]) ...
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/json-validation-functions.html
Beginning with MySQL 8.0.17, MySQL supports validation of JSON documents against JSON schemas conforming to Draft 4 of the JSON Schema specification. This can be done using either of the functions detailed in this section, both of which take two ...