任何配置错误是否会导致 mysql..mysql 调谐器显示创建过多的临时表
Current max_heap_table_size = 200 M
Current tmp_table_size = 200 M
Of 17158 temp tables, 30% were created on disk
table_open_cache = 125 tables
table_definition_cache = 256 tables
You have a total of 97 tables
You have 125 open tables.
Current table_cache hit rate is 3%
早期的临时表是“在 23725 个临时表中 38% 是在磁盘上创建的”，但我将 max_heap 和 tmp_table 从 16m 更改为 200m 并降低到 30%。
配置：
engine myisam
group_concat_max_len = 32768
key_buffer_size = 3.7 GB,
thread_stack = 256k,
table_cache = 125
query_cache_limit = …