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https://dev.mysql.com/doc/refman/8.0/en/json-function-reference.html
Table 14.22 JSON Functions Name Description Introduced 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 ...
https://dev.mysql.com/doc/refman/8.0/en/keywords.html
Certain keywords, such as SELECT, DELETE, or BIGINT, are reserved and require special treatment for use as identifiers such as table and column names. This may also be true for the names of built-in functions. Some keywords which are otherwise ...
https://dev.mysql.com/doc/refman/8.0/en/known-issues.html
This section lists known issues in recent versions of MySQL. For information about platform-specific issues, see the installation and debugging instructions in Section 2.1, “General Installation Guidance”, and Section 7.9, “Debugging MySQL”. The following problems are known: Subquery optimization for IN is not as effective as for ...
https://dev.mysql.com/doc/refman/8.0/en/load-index.html
tbl_index_list: tbl_name [PARTITION (partition_list)] [{INDEX|KEY} (index_name[, index_name] ...)] [IGNORE LEAVES] partition_list: { partition_name[, partition_name] ... | ALL } The LOAD INDEX INTO CACHE statement preloads a table index into the key ...
https://dev.mysql.com/doc/refman/8.0/en/making-trace-files.html
If the mysqld server does not start or it crashes easily, you can try to create a trace file to find the problem. To do this, you must have a mysqld that has been compiled with debugging support. If the version number ends with -debug, it is ...
https://dev.mysql.com/doc/refman/8.0/en/metadata-locking.html
MySQL uses metadata locking to manage concurrent access to database objects and to ensure data consistency. Metadata locking applies not just to tables, but also to schemas, stored programs (procedures, functions, triggers, scheduled events), ...
https://dev.mysql.com/doc/refman/8.0/en/monitor-innodb-mutex-waits-performance-schema.html
A mutex is a synchronization mechanism used in the code to enforce that only one thread at a given time can have access to a common resource. When two or more threads executing in the server need to access the same resource, the threads compete ...