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https://dev.mysql.com/doc/refman/8.0/en/replication-features-repair-table.html
When used on a corrupted or otherwise damaged table, it is possible for the REPAIR TABLE statement to delete rows that cannot be recovered. However, any such modifications of table data performed by this statement are not replicated, which can ...
https://dev.mysql.com/doc/refman/8.0/en/subquery-optimization.html
Note A limitation on UPDATE and DELETE statements that use a subquery to modify a single table is that the optimizer does not use semijoin or materialization subquery optimizations. As a workaround, try rewriting them as multiple-table UPDATE and ...
https://dev.mysql.com/doc/refman/8.0/en/table-corruption.html
If you have started mysqld with the myisam_recover_options system variable set, MySQL automatically checks and tries to repair MyISAM tables if they are marked as 'not closed properly' or 'crashed'. If this happens, MySQL writes an entry in the ...
https://dev.mysql.com/doc/refman/8.0/en/myisam-maintenance-schedule.html
It is a good idea to perform table checks on a regular basis rather than waiting for problems to occur. One way to check and repair MyISAM tables is with the CHECK TABLE and REPAIR TABLE statements. It is also a good idea to enable automatic MyISAM ...The -s option (short for --silent) causes myisamchk to run in silent mode, printing messages only when errors ...
https://dev.mysql.com/doc/refman/8.0/en/sys-schema-table-statistics.html
By default, rows are sorted by descending total wait time (tables with most contention first). The schema_table_statistics and x$schema_table_statistics views have these columns: table_schema The schema that contains the table. total_latency The ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-ndb-transid-mysql-connection-map-table.html
For this table to be created, the MySQL Server must be a binary supplied with the NDB Cluster distribution, or one built from the NDB Cluster sources with NDB storage engine support enabled. The ndb_transid_mysql_connection_map table provides a ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-memory-tables.html
Consider using MEMORY tables for noncritical data that is accessed often, and is read-only or rarely updated. Benchmark your application against equivalent InnoDB or MyISAM tables under a realistic workload, to confirm that any additional ...B-tree ...
https://dev.mysql.com/doc/refman/8.0/en/explain.html
The SHOW CREATE TABLE, SHOW TABLE STATUS, and SHOW INDEX statements also provide information about tables. {EXPLAIN | DESCRIBE | DESC} tbl_name [col_name | wild] {EXPLAIN | DESCRIBE | DESC} [explain_type] {explainable_stmt | FOR CONNECTION ...The ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-info.html
Methods of obtaining such information include the following: Using the SHOW CREATE TABLE statement to view the partitioning clauses used in creating a partitioned table. A new row event is created for a modification that takes place in a different ...Using the SHOW TABLE STATUS statement to determine whether a table is ... This section discusses obtaining ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-st-spatial-reference-systems-table.html
The ST_SPATIAL_REFERENCE_SYSTEMS table provides information about available spatial reference systems (SRSs) for spatial data. Entries in the ST_SPATIAL_REFERENCE_SYSTEMS table are based on the European Petroleum Survey Group (EPSG) data set, ...