How to use the pt-duplicate-key-checker tool in MySQL
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Pt-duplicate-key-checker
Function introduction:
Find duplicate indexes and foreign keys from the mysql table. This tool lists duplicate indexes and foreign keys.
And generate a statement to delete the duplicate index
Usage introduction:
Pt-duplicate-key-checker
[OPTION...]
[DSN]
Contains more options, specifically, you can use the command pt-duplicate-key-checker-- help to see which options are supported.
DSN is a database or table.
Examples of use:
[root@idb4] # pt-duplicate-key-checker-host=localhost-user=mdba-password=123456-database=sjcj
#
# sjcj.ai_kp_xxfp
#
# FPDM is a left-prefix of fpdm_fphm_index
# Key definitions:
# KEY `FPDM` (`FPDM`)
# KEY `index` (`FPDM`, `FPHM`)
# Column types:
# `fpdm` varchar (20) not null default''comment'?
# `fphm` varchar (20) not null default'0' comment'?
# To remove this duplicate index, execute:
ALTER TABLE `sjcj`.`ai _ kp_ xxfp` DROP INDEX `FPDM`
#
# sjcj.asb_download
#
# Uniqueness of id ignored because PRIMARY is a duplicate constraint
# id is a duplicate of PRIMARY
# Key definitions:
# UNIQUE KEY `id` (`id`) USING BTREE
# PRIMARY KEY (`id`)
# Column types:
# `id` int (12) not null auto_increment
# To remove this duplicate index, execute:
ALTER TABLE `sjcj`.`asb _ download`DROP INDEX `id`
#
# sjcj.ixinnuo_ptfp_zyfp_jsfp_dzfp_mx
#
# index_fpdm is a left-prefix of PRIMARY
# Key definitions:
# KEY `index_ fpdm` (`FPDM`)
# PRIMARY KEY (`FPDM`, `FPHM`, `ID`)
# Column types:
# `fpdm` varchar (20) not null comment'?
# `fphm` varchar (20) not null comment'?
# `id`float not null comment'?
# To remove this duplicate index, execute:
ALTER TABLE `sjcj`.`ixinnuo _ ptfp_zyfp_jsfp_dzfp_ mx`DROP INDEX `index_ fpdm`
#
# sjcj.jxfp
#
# jxfp_ind is a duplicate of idx_fpdm_fphm
# Key definitions:
# KEY `jxfp_ ind` (`fpdm`, `fphm`)
# KEY `idx_fpdm_ fphm` (`fpdm`, `fphm`)
# Column types:
# `fpdm` varchar (20) default null comment'?
# `fphm` varchar (20) default null comment'?
# To remove this duplicate index, execute:
ALTER TABLE `sjcj`.`jxfp` DROP INDEX `jxfp_ ind`
#
# Summary of indexes
#
# Size Duplicate Indexes 702977946
# Total Duplicate Indexes 4
# Total Indexes 179
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