LOAD INDEX INTO CACHE Syntax in MySQL
LOAD INDEX INTO CACHE
tbl_index_list [, tbl_index_list] …
tbl_index_list:
tbl_name
[[INDEX] (index_name[, index_name] …)]
[IGNORE LEAVES]
The LOAD INDEX INTO CACHE statement preloads a table index into the key cache to which it
has been assigned by an explicit CACHE INDEX statement, or into the default key cache otherwise.
LOAD INDEX INTO CACHE is used only for MyISAM tables.
The IGNORE LEAVES modifier causes only blocks for the non-leaf nodes of the index to be
preloaded.
The following statement preloads nodes (index blocks) of indexes of the tables t1 and t2:
mysql> LOAD INDEX INTO CACHE t1, t2 IGNORE LEAVES;
+———+————–+———-+———-+
| Table | Op | Msg_type | Msg_text |
+———+————–+———-+———-+
| test.t1 | preload_keys | status | OK |
| test.t2 | preload_keys | status | OK |
+———+————–+———-+———-+
This statement preloads all index blocks from t1. It preloads only blocks for the non-leaf
nodes from t2.
The syntax of LOAD INDEX INTO CACHE allows you to specify that only particular indexes from
a table should be preloaded. However, the current implementation preloads all the table’s
indexes into the cache, so there is no reason to specify anything other than the table name.
LOAD INDEX INTO CACHE was added in MySQL 4.1.1.
If you enjoyed this post, please consider to leave a comment or subscribe to the feed and get future articles delivered to your feed reader.
Comments
No comments yet.
Leave a comment