摘要： dont create index on each column for multicolumn index, the column order matters for B-Tree index UNIQUE and PRIMARY KEY are constraints, not indexes. 阅读全文

摘要： 1. max_connections open_files_limit table_open_cache 如何配置 table_open_cache = max_connections * N (N is the maximun number of tables open in each conne 阅读全文