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https://dev.mysql.com/doc/refman/8.0/en/mysqlcheck.html
The mysqlcheck client performs table maintenance: It checks, repairs, optimizes, or analyzes tables. Each table is locked and therefore unavailable to other sessions while it is being processed, although for check operations, the table is locked ...
https://dev.mysql.com/doc/refman/8.0/en/optimize-table.html
OPTIMIZE TABLE reorganizes the physical storage of table data and associated index data, to reduce storage space and improve I/O efficiency when accessing the table. The exact changes made to each table depend on the storage engine used by that ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-myisam-bulk-data-loading.html
These performance tips supplement the general guidelines for fast inserts in Section 10.2.5.1, “Optimizing INSERT Statements”. For a MyISAM table, you can use concurrent inserts to add rows at the same time that SELECT statements are running, ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-queries-myisam.html
Some general tips for speeding up queries on MyISAM tables: To help MySQL better optimize queries, use ANALYZE TABLE or run myisamchk --analyze on a table after it has been loaded with data. This updates a value for each index part that indicates ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-hash.html
Partitioning by HASH is used primarily to ensure an even distribution of data among a predetermined number of partitions. To partition a table using HASH partitioning, it is necessary to append to the CREATE TABLE statement a PARTITION BY HASH ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-connection-attribute-tables.html
Connection attributes are key-value pairs that application programs can pass to the server at connect time. For applications based on the C API implemented by the libmysqlclient client library, the mysql_options() and mysql_options4() functions ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-metadata-locks-table.html
MySQL uses metadata locking to manage concurrent access to database objects and to ensure data consistency; see Section 10.11.4, “Metadata Locking”. Metadata locking applies not just to tables, but also to schemas, stored programs (procedures, ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-status-variables.html
Performance Schema status variables have the following meanings: Performance_schema_accounts_lost The number of times a row could not be added to the accounts table because it was full. Performance_schema_digest_lost The number of digest instances ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-tp-thread-group-stats-table.html
Note The Performance Schema table described here is available as of MySQL 8.0.14. Prior to MySQL 8.0.14, use the corresponding INFORMATION_SCHEMA table instead; see Section 28.5.3, “The INFORMATION_SCHEMA TP_THREAD_GROUP_STATS Table”. The ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema.html
The MySQL Performance Schema is a feature for monitoring MySQL Server execution at a low level. The Performance Schema has these characteristics: The Performance Schema provides a way to inspect internal execution of the server at runtime. It is ...