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https://dev.mysql.com/doc/refman/5.7/en/performance-schema-memory-model.html
Memory used depends on the load actually seen, not the load estimated or explicitly configured for. As the Performance Schema collects data, memory is allocated in the corresponding buffer. The buffer size is unbounded, and may grow with the load.
https://dev.mysql.com/doc/refman/5.7/en/replication-multi-source-provision-replica.html
If the sources in the multi-source replication topology have existing data, it can save time to provision the replica with the relevant data before starting replication. In a multi-source replication topology, copying the data directory cannot be ...
https://dev.mysql.com/doc/refman/5.7/en/spatial-function-argument-handling.html
Spatial values, or geometries, have the properties described in Section 11.4.2.2, “Geometry Class”. Specific functions or groups of functions may have additional or different argument-handling characteristics, as discussed in the sections where ...
https://dev.mysql.com/doc/refman/5.7/en/spatial-geohash-functions.html
Geohash is a system for encoding latitude and longitude coordinates of arbitrary precision into a text string. Geohash values are strings that contain only characters chosen from "0123456789bcdefghjkmnpqrstuvwxyz". ST_GeoHash(longitude, latitude, ...The functions in this section enable manipulation of geohash values, which provides applications the capabilities of importing and exporting geohash data, and of indexing and searching geohash ...
https://dev.mysql.com/doc/refman/5.7/en/keyring-service.html
Syntax: my_bool my_key_fetch(const char *key_id, const char **key_type, const char* user_id, void **key, size_t *key_len) Arguments: key_id, user_id: Null-terminated strings that as a pair form a unique identifier indicating which key to fetch. The ...If there is no user context, this value can be ... MySQL Server supports a keyring service that enables internal server components and plugins to ...
https://dev.mysql.com/doc/refman/5.7/en/dynamic-format.html
Dynamic-format tables have these characteristics: All string columns are dynamic except those with a length less than four. Each row is preceded by a bitmap that indicates which columns contain the empty string (for string columns) or zero (for ...
https://dev.mysql.com/doc/refman/5.7/en/json-utility-functions.html
This section documents utility functions that act on JSON values, or strings that can be parsed as JSON values. The value supplied must be a JSON value or a valid string representation of a JSON value. Special characters in string scalars and key ...JSON_PRETTY() prints out a JSON value in a format that is easy to ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-memcached-troubleshoot.html
Attempting to insert a NULL value into a NOT NULL column causes the INSERT to fail, which may only become evident after you reinitialize the daemon_memcached plugin to apply changes to the innodb_memcache.containers table. If cas_column and ... This ...
https://dev.mysql.com/doc/refman/5.7/en/rewriter-query-rewrite-plugin-usage.html
row *************************** id: 1 pattern: SELECT ? pattern_database: NULL replacement: SELECT ? + 1 enabled: YES message: NULL pattern_digest: NULL normalized_pattern: NULL The rule specifies a pattern template indicating which SELECT ... To ...
https://dev.mysql.com/doc/refman/5.7/en/version-tokens-usage.html
Each of those functions, if successful, returns a binary string indicating what action occurred. Version Tokens treats token names and values as binary strings, so comparisons are case-sensitive. Otherwise, an error occurs: mysql> SELECT ... Before ...