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https://dev.mysql.com/doc/heatwave/en/mys-hw-lakehouse-generated-columns.html
As of MySQL 9.5.1, you have the option to include stored generated columns when creating external Lakehouse tables. To learn more about generated columns, see CREATE TABLE and Generated Columns. Before You Begin Prepare to create external tables by ...col_name data_type [GENERATED ALWAYS] AS (expr) STORED [NOT NULL | NULL] [UNIQUE [KEY]] [[PRIMARY] KEY] [COMMENT 'string'], ...
https://dev.mysql.com/doc/refman/8.4/en/sys-sys-config.html
This table contains sys schema configuration options, one row per option. Configuration changes made by updating this table persist across client sessions and server restarts. The sys_config table has these columns: variable The configuration ...
https://dev.mysql.com/doc/refman/8.4/en/general-tablespaces.html
A general tablespace is a shared InnoDB tablespace that is created using CREATE TABLESPACE syntax. The server keeps tablespace metadata in memory for the lifetime of a tablespace. Multiple tables in fewer general tablespaces consume less memory for ...To make an unknown directory known to InnoDB, add the directory to the innodb_directories argument ...
https://dev.mysql.com/doc/refman/8.4/en/information-schema-innodb-tablestats-table.html
The INNODB_TABLESTATS table provides a view of low-level status information about InnoDB tables. This data is used by the MySQL optimizer to calculate which index to use when querying an InnoDB table. InnoDB tables are represented in this view if ...This information is derived from in-memory data structures rather than data stored on ...
https://dev.mysql.com/doc/refman/8.4/en/sys-schema-table-statistics-with-buffer.html
These views summarize table statistics, including InnoDB buffer pool statistics. By default, rows are sorted by descending total wait time (tables with most contention first). The schema_table_statistics_with_buffer and ...
https://dev.mysql.com/doc/refman/8.4/en/grant.html
(Alternatively, if you have the UPDATE privilege for the grant tables in the mysql system schema, you can grant any account any privilege.) When the read_only system variable is enabled, GRANT additionally requires the CONNECTION_ADMIN privilege (or ...[WITH GRANT OPTION] [AS user [WITH ROLE DEFAULT | NONE | ALL | ALL EXCEPT role [, role ] ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-compression-tuning-monitoring.html
This section builds on the performance tuning advice from Section 17.9.1.3, “Tuning Compression for InnoDB Tables”, and shows how to find problems that might not turn up during initial testing. To dig deeper into performance considerations for ... Overall application performance, CPU and I/O utilization and the size of disk files are good indicators of how effective compression is for your ...
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-ndbinfo-dict-obj-tree.html
The dict_obj_tree table provides a tree-based view of table information from the dict_obj_info table. This means that you must know the name of any tablespace or log file group associated with a given table, or obtain this information from SHOW ...
https://dev.mysql.com/doc/refman/8.4/en/replication-features-memory.html
When a replication source server shuts down and restarts, its MEMORY tables become empty. To replicate this effect to replicas, the first time that the source uses a given MEMORY table after startup, it logs an event that notifies replicas that the ...This generated event is identifiable by a comment in the binary log, and if GTIDs are in use on the server, it has a GTID ...
https://dev.mysql.com/doc/heatwave/en/mys-hwgenai-ml-generate-table.html
The ML_GENERATE_TABLE routine runs multiple text generation or summarization queries in a batch, in parallel. Note In versions older than MySQL 9.2.1, to alter an existing table or create a new table, MySQL requires you to set the ...The output ...