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https://dev.mysql.com/doc/refman/5.7/en/performance-schema-host-cache-table.html
The host_cache_size system variable controls the size of the host cache, as well as the size of the host_cache table. Because the host_cache table exposes the contents of the host cache, it can be examined using SELECT statements. The Performance ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-system-variable-tables.html
Note The value of the show_compatibility_56 system variable affects the information available from the tables described here. System variable information is available in these Performance Schema tables: global_variables: Global system variables. An ...For details, see the description of that variable in Section 5.1.7, “Server System ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-table-reference.html
The following table summarizes all available Performance Schema tables. For greater detail, see the individual table descriptions. Table 25.1 Performance Schema Tables Table Name Description Deprecated accounts Connection statistics per client ...
https://dev.mysql.com/doc/refman/5.7/en/repair-table-optimization.html
An alternative that avoids this problem is to use a separate key cache, assign to it the indexes from the table to be repaired, and deallocate it when the repair is complete. REPAIR TABLE for MyISAM tables is similar to using myisamchk for repair ...You may be able to its improve performance by setting these variables, as described in Section 4.6.3.6, “myisamchk Memory ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-compression-tuning-monitoring.html
This section builds on the performance tuning advice from Section 14.9.1.3, “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/5.7/en/mysql-cluster-programs-ndb-index-stat.html
ndb_index_stat provides per-fragment statistical information about indexes on NDB tables. sampleCount can be compared with the cardinality of SHOW INDEX or INFORMATION_SCHEMA.STATISTICS, although the latter two provide a view of the table as a ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-system-variables.html
The alternative SHOW PROCESSLIST implementation is based on the Performance Schema processlist table. To ensure that the default and alternative implementations yield the same information, certain configuration requirements must be met; see Section ...Even when the Performance Schema is disabled, it continues to populate the global_variables, session_variables, global_status, and session_status ...
https://dev.mysql.com/doc/refman/5.7/en/myisam-table-formats.html
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 with the ROW_FORMAT table option. The third, compressed format, can be created only with the myisampack utility ...Two of them, fixed and dynamic format, are chosen automatically depending on the type of columns you are ...
https://dev.mysql.com/doc/refman/5.7/en/data-size.html
To use a row format other than DYNAMIC, configure innodb_default_row_format, or specify the ROW_FORMAT option explicitly in a CREATE TABLE or ALTER TABLE statement. Design your tables to minimize their space on the disk. Smaller tables normally ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-replication-issues.html
This can be done by issuing a statement such as ALTER TABLE mysql.ndb_apply_status ENGINE=MyISAM on the replica. In the event of a node failure, errors in replication of NDB tables without primary keys can still occur, due to the possibility of ...