Error code:1728 Cannot load from mysql.proc. The table is probably corrupted

Error code:1728 Cannot load from mysql.proc. The table is probably corrupted

http://bugs.mysql.com/bug.php?id=50183
原因是mysql.proc 在5.1 comment char(64) -> 5.5 comment text 导致

The difference seen in the mysql.proc table is
5.5
<   `comment` text CHARACTER SET utf8 COLLATE utf8_bin NOT NULL,
---
5.1
 >   `comment` char(64) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL DEFAULT '',


我们只需要将table proc column comment 改为text类型就可以了

ALTER TABLE `proc`
MODIFY COLUMN `comment`  text CHARACTER SET utf8 COLLATE utf8_bin NOT NULL;