… it is string length at which it makes sense is collation specific. Q: ORDER By optimization issues: select * from table where A… performance impact of extending index is when you increase its length dramatically, for example adding long varchar column. In such cases… MySQL can avoid temporary table or filesort for group by by this column. This works because by scanning data in index order MySQL gets data…

… test box: mysql> select count(*),sum(data_length) from information_schema.tables; +———-+——————+ | count(*) | sum(data_length) | +———-+——————+ | 130 | 2856365892 | +———-+——————+ 1 row in set (1.08 sec) mysql> set…, 0 rows affected (0.00 sec) mysql> select count(*),sum(data_length) from information_schema.tables; +———-+——————+ | count(*) | sum(data_length) | +———-+——————+ | 130 | 2856365892 | +———-+——————+ 1 row in set…

…MySQL manual, especially the option and variable reference table…table_sizeblogpercona.commanual max_insert_delayed_threadsblogpercona.commanual max_join_sizeblogpercona.commanual max_length…

… is that each MV could have drifted by a different length of time. A view which has drifted out of sync… the list of tables used by the above view, as stored in the data dictionary: mysql> select * from flexviews.mview_table where mview_id= flexviews.get_id(‘demo’,'dashboard_customer_sales’)\G *************************** 1. row *************************** mview_table…