(mysql.info) cache-index

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 13.5.5.1 `CACHE INDEX' Syntax
 .............................
 
      CACHE INDEX
        TBL_INDEX_LIST [, TBL_INDEX_LIST] ...
        IN KEY_CACHE_NAME
 
      TBL_INDEX_LIST:
        TBL_NAME [[INDEX|KEY] (INDEX_NAME[, INDEX_NAME] ...)]
 
 The `CACHE INDEX' statement assigns table indexes to a specific key
 cache. It is used only for `MyISAM' tables.
 
 The following statement assigns indexes from the tables `t1', `t2', and
 `t3' to the key cache named `hot_cache':
 
      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       |
      +---------+--------------------+----------+----------+
 
 The syntax of `CACHE INDEX' enables you to specify that only particular
 indexes from a table should be assigned to the cache. The current
 implementation assigns all the table's indexes to the cache, so there
 is no reason to specify anything other than the table name.
 
 The key cache referred to in a `CACHE INDEX' statement can be created
 by setting its size with a parameter setting statement or in the server
 parameter settings. For example:
 
      mysql> SET GLOBAL keycache1.key_buffer_size=128*1024;
 
 Key cache parameters can be accessed as members of a structured system
 variable. See  structured-system-variables.
 
 A key cache must exist before you can assign indexes to it:
 
      mysql> CACHE INDEX t1 IN non_existent_cache;
      ERROR 1284 (HY000): Unknown key cache 'non_existent_cache'
 
 By default, table indexes are assigned to the main (default) key cache
 created at the server startup. When a key cache is destroyed, all
 indexes assigned to it become assigned to the default key cache again.
 
 Index assignment affects the server globally: If one client assigns an
 index to a given cache, this cache is used for all queries involving
 the index, no matter which client issues the queries.
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