Search Results
https://dev.mysql.com/doc/refman/8.4/en/partitioning-limitations-partitioning-keys-unique-keys.html
The rule governing this relationship can be expressed as follows: All columns used in the partitioning expression for a partitioned table must be part of every unique key that the table may have. In other words, every unique key on the table must ...
https://dev.mysql.com/doc/ndbapi/en/ndb-ndb.html
(See Section 2.3.12, “The Ndb_cluster_connection Class”.) catalogName is an optional parameter providing a namespace for the tables and indexes created in any connection from the Ndb object. The optional schemaName provides an additional ...
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/deleting-from-related-tables.html
If the total length of the DELETE statement for related_table is more than the default value of the max_allowed_packet system variable, you should split it into smaller parts and execute multiple DELETE statements. You probably get the fastest ...
https://dev.mysql.com/doc/refman/8.4/en/table-definition-issues.html
...
https://dev.mysql.com/doc/refman/8.4/en/table-maintenance-statements.html
...
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/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/replication-features-memory.html
A change in max_heap_table_size takes effect for MEMORY tables that are created or updated using ALTER TABLE ... When a replication source server shuts down and restarts, its MEMORY tables become empty. To replicate this effect to replicas, the ...
https://dev.mysql.com/doc/heatwave/en/mys-hwgenai-ml-generate-table.html
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 sql-require-primary-key system variable to 0. If the specified output table doesn't exist, then a new table is created. The ...