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https://dev.mysql.com/doc/refman/8.0/en/identifier-mapping.html
(On a case-insensitive file system, both letters are treated as the same.) For some blocks, such as Cyrillic, the second byte determines lettercase. There is a correspondence between database and table identifiers and names in the file system. For ...
https://dev.mysql.com/doc/refman/8.0/en/index-condition-pushdown-optimization.html
ICP is not supported with secondary indexes created on virtual generated columns. The second part (lastname LIKE '%etrunia%') cannot be used to limit the number of rows that must be scanned, so without Index Condition Pushdown, this query must ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-columns-table.html
COLUMN_KEY Whether the column is indexed: If COLUMN_KEY is empty, the column either is not indexed or is indexed only as a secondary column in a multiple-column, nonunique index. The related ST_GEOMETRY_COLUMNS table provides information about table ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-files-table.html
The FILES table provides information about the files in which MySQL tablespace data is stored. In NDB Cluster, this table also provides information about the files in which NDB Cluster Disk Data tables are stored. For additional information ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-ft-config-table.html
The key names and their meanings include: optimize_checkpoint_limit: The number of seconds after which an OPTIMIZE TABLE run stops. The INNODB_FT_CONFIG table provides metadata about the FULLTEXT index and associated processing for an InnoDB table.
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-metrics-table.html
The INNODB_METRICS table provides a wide variety of InnoDB performance information, complementing the specific focus areas of the Performance Schema tables for InnoDB. With simple queries, you can check the overall health of the system. With more ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-optimization.html
The default is 86400 seconds (24 hours), but the time period can be extended to as much as one year. Applications that monitor databases may make frequent use of INFORMATION_SCHEMA tables. To write queries for these tables most efficiently, use the ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-parameters-table.html
The PARAMETERS table provides information about parameters for stored routines (stored procedures and stored functions), and about return values for stored functions. The PARAMETERS table does not include built-in (native) functions or loadable ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-routines-table.html
DATETIME_PRECISION For stored function temporal return values, the fractional seconds precision. The ROUTINES table provides information about stored routines (stored procedures and stored functions). The ROUTINES table does not include built-in ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-statistics-table.html
The information_schema_stats_expiry system variable defines the period of time before cached table statistics expire. If there are no cached statistics or statistics have expired, statistics are retrieved from storage engines when querying table ...