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https://dev.mysql.com/doc/refman/8.0/en/ndb-restore-parallel-data-node-backup.html
In the general case, no additional special arguments are required; ndb_restore always checks for the existence of parallel subdirectories under the directory indicated by the --backup-path option and restores the metadata (serially) and then the ...
https://dev.mysql.com/doc/refman/8.0/en/numeric-type-attributes.html
If you store values larger than the display width in an integer column that has the ZEROFILL attribute, you may experience problems when MySQL generates temporary tables for some complicated joins. Consider using an alternative means of producing ...
https://dev.mysql.com/doc/refman/8.0/en/obtaining-component-information.html
The mysql.component system table contains information about currently loaded components and shows which components have been registered using INSTALL COMPONENT. For example: mysql> SELECT * FROM mysql.component; ...
https://dev.mysql.com/doc/refman/8.0/en/optimize-benchmarking.html
With simple tests, you usually test how changing one aspect (a configuration setting, the set of indexes on a table, the SQL clauses in a query) affects performance. The most important feature to try with each workload is the adaptive hash index for ... To measure performance, consider the following factors: Whether you are measuring the speed of a single operation on a quiet system, or how a set of operations (a “workload”) works over a period of ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-subqueries.html
See also Section 10.2.2, “Optimizing Subqueries, Derived Tables, View References, and Common Table Expressions”. Development is ongoing, so no optimization tip is reliable for the long term. The following list provides some interesting tricks ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-limitations-functions.html
This section discusses limitations in MySQL Partitioning relating specifically to functions used in partitioning expressions. Each of these functions returns an integer only if it is passed an argument of an exact numeric type, such as one of the ...
https://dev.mysql.com/doc/refman/8.0/en/password-security-admin.html
MySQL stores passwords for user accounts in the mysql.user system table. Access to this table should never be granted to any nonadministrative accounts. The validate_password plugin can be used to enforce a policy on acceptable password. Database ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-instrumentation-checking.html
It is always possible to determine what instruments the Performance Schema includes by checking the setup_instruments table. As described earlier, it is possible to find out by querying the setup_instruments table. Changes to this code occur often, ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-memory-model.html
The buffers are global to the server, so the instruments are displayed only in the memory_summary_global_by_event_name table, and not in other memory_summary_by_xxx_by_event_name tables. Memory used depends on the load actually seen, not the load ...
https://dev.mysql.com/doc/refman/8.0/en/permission-optimization.html
Simplifying the privileges established by GRANT statements enables MySQL to reduce permission-checking overhead when clients execute statements. For example, if you do not grant any table-level or column-level privileges, the server need not ever ...