索引-缓存
语法格式
CACHE INDEX tbl_index_list [, tbl_index_list] ... IN key_cache_name tbl_index_list: tbl_name [[INDEX|KEY] (index_name[, index_name] ...)]
说明
CACHE INDEX
可以将表中索引分配到一些特别主键缓存。注意这些操作只能在MyISAM 存储引擎的表上进行。
例子
下面语句可以将table t1,t2,t3 的索引分配到hot_cache缓存中:
mysql> CACHE INDEX t1, t2, t3 IN hot_cache; +---------+--------------------+----------+----------+ | Table | Op | Msg_type | Msg_text | +---------+--------------------+----------+----------+ | test.t1 | assign_to_keycache | status | OK | | test.t2 | assign_to_keycache | status | OK | | test.t3 | assign_to_keycache | status | OK | +---------+--------------------+----------+----------+
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