mysql居然可以在相同的字段上重復(fù)建索引，oracle是不行的。需要安裝pt-query-digest。

[[email?protected] ~]# pt-duplicate-key-checker -h10.10.11.208 -uroot -proot -P3316 --charset=gbk

# ########################################################################

# test.app_chat_message

# ########################################################################

# idx_app_chat_message_to_user_from_user is a left-prefix of Index 3

# Key definitions:

# ? KEY `idx_app_chat_message_to_user_from_user` (`to_user`,`from_user`),

# ? KEY `Index 3` (`to_user`,`from_user`,`message_id`),

# Column types:

# ? ? ? ? `to_user` varchar(50) not null default ‘‘

# ? ? ? ? `from_user` varchar(50) not null default ‘‘

# ? ? ? ? `message_id` varchar(40) not null default ‘‘

# To remove this duplicate index, execute:

ALTER TABLE `test`.`app_chat_message` DROP INDEX `idx_app_chat_message_to_user_from_user`;

# Index 2 is a left-prefix of Index 3

# Key definitions:

# ? KEY `Index 2` (`to_user`,`from_user`),

# ? KEY `Index 3` (`to_user`,`from_user`,`message_id`),

# Column types:

# ? ? ? ? `to_user` varchar(50) not null default ‘‘

# ? ? ? ? `from_user` varchar(50) not null default ‘‘

# ? ? ? ? `message_id` varchar(40) not null default ‘‘

# To remove this duplicate index, execute:

ALTER TABLE `test`.`app_chat_message` DROP INDEX `Index 2`;

# ########################################################################

# test.pub_user

# ########################################################################

# phone is a duplicate of phone_idx

# Key definitions:

# ? KEY `phone` (`phone`),

# ? KEY `phone_idx` (`phone`),

# Column types:

# ? ? ? ? `phone` varchar(15) collate utf8_bin default null

# To remove this duplicate index, execute:

ALTER TABLE `test`.`pub_user` DROP INDEX `phone`;

# email is a duplicate of email_idx

# Key definitions:

# ? KEY `email` (`email`),

# ? KEY `email_idx` (`email`),

# Column types:

# ? ? ? ? `email` varchar(50) collate utf8_bin default null

# To remove this duplicate index, execute:

ALTER TABLE `test`.`pub_user` DROP INDEX `email`;

# account is a duplicate of account_idx

# Key definitions:

# ? KEY `account` (`account`),

# ? KEY `account_idx` (`account`),

# Column types:

# ? ? ? ? `account` varchar(50) collate utf8_bin default null

# To remove this duplicate index, execute:

ALTER TABLE `test`.`pub_user` DROP INDEX `account`;

#########################################################################

.........................................................................

.........................................................................

# Size Duplicate Indexes ? 20358902596

# Total Duplicate Indexes ?17

# Total Indexes ? ? ? ? ? ?664

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原文：http://blog.csdn.net/stevendbaguo/article/details/48031441

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