[[email protected] ~]# wget https://www.percona.com/downloads/percona-toolkit/3.0.13/binary/redhat/7/x86_64/percona-toolkit-3.0.13-re85ce15-el7-x86_64-bundle.tar

[[email protected] ~]# rpm -ivh percona-toolkit-3.0.13-1.el7.x86_64.rpm 
warning: percona-toolkit-3.0.13-1.el7.x86_64.rpm: Header V4 RSA/SHA256 Signature,key ID 8507efa5: NOKEY
error: Failed dependencies:
        perl(DBI) >= 1.13 is needed by percona-toolkit-3.0.13-1.el7.x86_64
        perl(DBD::MysqL) >= 1.0 is needed by percona-toolkit-3.0.13-1.el7.x86_64
        perl(IO::Socket::SSL) is needed by percona-toolkit-3.0.13-1.el7.x86_64

[[email protected] ~]# rpm -ivh percona-toolkit-3.0.13-1.el7.x86_64.rpm 
warning: percona-toolkit-3.0.13-1.el7.x86_64.rpm: Header V4 RSA/SHA256 Signature,key ID 8507efa5: NOKEY
Preparing...                          ################################# [100%]
Updating / installing...
   1:percona-toolkit-3.0.13-1.el7     ################################# [100%]

[[email protected] ~]# pt-duplicate-key-checker --help
pt-duplicate-key-checker examines MysqL tables for duplicate or redundant
indexes and foreign keys.  Connection options are read from MysqL option files.
For more details,please use the --help option,or try ‘perldoc
/usr/bin/pt-duplicate-key-checker‘ for complete documentation.

Usage: pt-duplicate-key-checker [OPTIONS] [DSN]

Options:

  --all-structs         Compare indexes with different structs (BTREE,HASH,etc)
  --ask-pass            Prompt for a password when connecting to MysqL
  --charset=s       -A  Default character set
  --[no]clustered       PK columns appended to secondary key is duplicate (
                        default yes)
  --config=A            Read this comma-separated list of config files; if
                        specified,this must be the first option on the command
                        line
  --databases=h     -d  Check only this comma-separated list of databases
  --defaults-file=s -F  Only read MysqL options from the given file
  --engines=h       -e  Check only tables whose storage engine is in this comma-
                        separated list
  --help                Show help and exit
  --host=s          -h  Connect to host
  --ignore-databases=H  Ignore this comma-separated list of databases
  --ignore-engines=H    Ignore this comma-separated list of storage engines
  --ignore-order        Ignore index order so KEY(a,b) duplicates KEY(b,a)
  --ignore-tables=H     Ignore this comma-separated list of tables
  --key-types=s         Check for duplicate f=foreign keys,k=keys or fk=both (
                        default fk)
  --password=s      -p  Password to use when connecting
  --pid=s               Create the given PID file
  --port=i          -P  Port number to use for connection
  --set-vars=A          Set the MysqL variables in this comma-separated list of
                        variable=value pairs
  --socket=s        -S  Socket file to use for connection
  --[no]sql             Print DROP KEY statement for each duplicate key (
                        default yes)
  --[no]summary         Print summary of indexes at end of output (default yes)
  --tables=h        -t  Check only this comma-separated list of tables
  --user=s          -u  User for login if not current user
  --verbose         -v  Output all keys and/or foreign keys found,not just
                        redundant ones
  --version             Show version and exit
  --[no]version-check   Check for the latest version of Percona Toolkit,MysqL,and other programs (default yes)

Option types: s=string,i=integer,f=float,h/H/a/A=comma-separated list,d=DSN,z=size,m=time

Rules:

  This tool accepts additional command-line arguments. Refer to the SYNOPSIS and usage information for details.

DSN Syntax is key=value[,key=value...]  Allowable DSN keys:

  KEY  COPY  MEANING
  ===  ====  =============================================
  A    yes   Default character set
  D    yes   Default database
  F    yes   Only read default options from the given file
  P    yes   Port number to use for connection
  S    yes   Socket file to use for connection
  h    yes   Connect to host
  p    yes   Password to use when connecting
  u    yes   User for login if not current user

  If the DSN is a bareword,the word is treated as the ‘h‘ key.

Options and values after processing arguments:

  --all-structs         FALSE
  --ask-pass            FALSE
  --charset             (No value)
  --clustered           TRUE
  --config              /etc/percona-toolkit/percona-toolkit.conf,/etc/percona-toolkit/pt-duplicate-key-checker.conf,/root/.percona-toolkit.conf,/root/.pt-duplicate-key-checker.conf
  --databases           (No value)
  --defaults-file       (No value)
  --engines             (No value)
  --help                TRUE
  --host                (No value)
  --ignore-databases    
  --ignore-engines      
  --ignore-order        FALSE
  --ignore-tables       
  --key-types           fk
  --password            (No value)
  --pid                 (No value)
  --port                (No value)
  --set-vars            
  --socket              (No value)
  --sql                 TRUE
  --summary             TRUE
  --tables              (No value)
  --user                (No value)
  --verbose             FALSE
  --version             FALSE
  --version-check       TRUE