https://dev.mysql.com/myisam-table-formats.html
Two of them, fixed and dynamic format, are chosen automatically depending on the type of columns you are using. When you use CREATE TABLE or ALTER TABLE for a table that has no BLOB or TEXT columns, you can force the table format to FIXED or DYNAMIC ...The third, compressed format, can be created only with the myisampack utility (see Section 4.6.6, “myisampack — Generate Compressed, Read-Only MyISAM ...
https://dev.mysql.com/order-by-optimization.html
There is an index on only a prefix of a column named in the ORDER BY clause. To obtain memory for filesort operations, as of MySQL 8.0.12, the optimizer allocates memory buffers incrementally as needed, up to the size indicated by the ... This ...
https://dev.mysql.com/mysql-cluster-limitations-syntax.html
There are no prefix indexes; only entire columns can be indexed. A partial fix for this issue improved the error used internally to work in most cases; however, it remains possible for this situation to occur in the event that the parent index is a ... Some SQL statements relating to certain MySQL features produce errors when used with NDB tables, as described in the following list: Temporary ...
https://dev.mysql.com/mysql-cluster-ndbd-definition.html
For those parameters affecting memory usage or buffer sizes, it is possible to use K, M, or G as a suffix to indicate units of 1024, 1024×1024, or 1024×1024×1024. Variable-length records use a fixed-size part with an extra overhead of 4 bytes to ... The [ndbd] and [ndbd default] sections are used to configure the behavior of the cluster's data ...
https://dev.mysql.com/partitioning-management-exchange.html
Table nt contains no foreign key references, and no other table has any foreign keys that refer to nt. There are no rows in nt that lie outside the boundaries of the partition definition for p. To determine the row format of an InnoDB table, query ...
https://dev.mysql.com/innodb-system-tablespace.html
If the previous last data file is defined with the keyword autoextend, change its definition to use a fixed size, based on how large it has actually grown. The InnoDB system tablespace is the storage area for the doublewrite buffer and the change ...
https://dev.mysql.com/performance-schema-connection-attribute-tables.html
FEDERATED storage engine connections: program_name: mysqld _client_role: federated_storage There are limits on the amount of connection attribute data transmitted from client to server: A fixed limit imposed by the client prior to connect time.
https://dev.mysql.com/adding-native-function.html
If the function is nondeterministic, include the following statement in the item constructor to indicate that function results should not be cached: current_thd->lex->safe_to_cache_query=0; A function is nondeterministic if, given fixed values for ... To add a new native MySQL function, use the procedure described here, which requires that you use a source ...
https://dev.mysql.com/mysql-cluster-option-tables.html
ndb_data_node_neighbour: Specifies cluster data node "closest" to this MySQL Server, for transaction hinting and fully replicated tables ndb_default_column_format: Sets default row format and column format (FIXED or DYNAMIC) used for new NDB tables ... The following table provides a list of the command-line options, server and status variables applicable within mysqld when it is running as an SQL node in an NDB ...
https://dev.mysql.com/custom-benchmarks.html
After fixing one bottleneck (or by replacing it with a “dummy” module), you can proceed to identify the next bottleneck. Most of the time, these problems would be much easier to fix if the systems were not already in production. Benchmark your ...