pt-fk-error-logger

pt-fk-error-logger

NAME

pt-fk-error-logger - Extract and log MySQL foreign key errors.

SYNOPSIS

Usage

pt-fk-error-logger [OPTION...] SOURCE_DSN

pt-fk-error-logger extracts and saves information about the most recent foreign key errors in a MySQL server.

Print foreign key errors on host1:

pt-fk-error-logger h=host1

Save foreign key errors on host1 to db.foreign_key_errors table on host2:

pt-fk-error-logger h=host1 --dest h=host1,D=db,t=foreign_key_errors

RISKS

The following section is included to inform users about the potential risks, whether known or unknown, of using this tool. The two main categories of risks are those created by the nature of the tool (e.g. read-only tools vs. read-write tools) and those created by bugs.

pt-fk-error-logger is read-only unless you specify --dest. It should be very low-risk.

At the time of this release, we know of no bugs that could cause serious harm to users.

The authoritative source for updated information is always the online issue tracking system. Issues that affect this tool will be marked as such. You can see a list of such issues at the following URL: http://www.percona.com/bugs/pt-fk-error-logger.

See also “BUGS” for more information on filing bugs and getting help.

DESCRIPTION

pt-fk-error-logger prints or saves the foreign key errors text from SHOW INNODB STATUS. The errors are not parsed or interpreted in any way. Foreign key errors are uniquely identified by their timestamp. Only new (more recent) errors are printed or saved.

OUTPUT

If --print is given or no --dest is given, then pt-fk-error-logger prints the foreign key error text to STDOUT exactly as it appeared in SHOW INNODB STATUS.

OPTIONS

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

--ask-pass

Prompt for a password when connecting to MySQL.

--charset

short form: -A; type: string

Default character set. If the value is utf8, sets Perl’s binmode on STDOUT to utf8, passes the mysql_enable_utf8 option to DBD::mysql, and runs SET NAMES UTF8 after connecting to MySQL. Any other value sets binmode on STDOUT without the utf8 layer, and runs SET NAMES after connecting to MySQL.

--config

type: Array

Read this comma-separated list of config files; if specified, this must be the first option on the command line.

--daemonize

Fork to the background and detach from the shell. POSIX operating systems only.

--defaults-file

short form: -F; type: string

Only read mysql options from the given file. You must give an absolute pathname.

--dest

type: DSN

DSN for where to store foreign key errors; specify at least a database (D) and table (t).

Missing values are filled in with the same values from the source host, so you can usually omit most parts of this argument if you’re storing foreign key errors on the same server on which they happen.

The following table is suggested:

CREATE TABLE foreign_key_errors (
  ts datetime NOT NULL,
  error text NOT NULL,
  PRIMARY KEY (ts),
)

The only information saved is the timestamp and the foreign key error text.

--help

Show help and exit.

--host

short form: -h; type: string

Connect to host.

--interval

type: time; default: 0

How often to check for foreign key errors.

--log

type: string

Print all output to this file when daemonized.

--password

short form: -p; type: string

Password to use when connecting.

--pid

type: string

Create the given PID file when daemonized. The file contains the process ID of the daemonized instance. The PID file is removed when the daemonized instance exits. The program checks for the existence of the PID file when starting; if it exists and the process with the matching PID exists, the program exits.

--port

short form: -P; type: int

Port number to use for connection.

--print

Print results on standard output. See “OUTPUT” for more.

--run-time

type: time

How long to run before exiting.

--set-vars

type: string; default: wait_timeout=10000

Set these MySQL variables. Immediately after connecting to MySQL, this string will be appended to SET and executed.

--socket

short form: -S; type: string

Socket file to use for connection.

--user

short form: -u; type: string

User for login if not current user.

--version

Show version and exit.

DSN OPTIONS

These DSN options are used to create a DSN. Each option is given like option=value. The options are case-sensitive, so P and p are not the same option. There cannot be whitespace before or after the = and if the value contains whitespace it must be quoted. DSN options are comma-separated. See the percona-toolkit manpage for full details.

  • A

dsn: charset; copy: yes

Default character set.

  • D

dsn: database; copy: yes

Default database.

  • F

dsn: mysql_read_default_file; copy: yes

Only read default options from the given file

  • h

dsn: host; copy: yes

Connect to host.

  • p

dsn: password; copy: yes

Password to use when connecting.

  • P

dsn: port; copy: yes

Port number to use for connection.

  • S

dsn: mysql_socket; copy: yes

Socket file to use for connection.

  • t
Table in which to store foreign key errors.
  • u

dsn: user; copy: yes

User for login if not current user.

ENVIRONMENT

The environment variable PTDEBUG enables verbose debugging output to STDERR. To enable debugging and capture all output to a file, run the tool like:

PTDEBUG=1 pt-fk-error-logger ... > FILE 2>&1

Be careful: debugging output is voluminous and can generate several megabytes of output.

SYSTEM REQUIREMENTS

You need Perl, DBI, DBD::mysql, and some core packages that ought to be installed in any reasonably new version of Perl.

BUGS

For a list of known bugs, see http://www.percona.com/bugs/pt-fk-error-logger.

Please report bugs at https://bugs.launchpad.net/percona-toolkit. Include the following information in your bug report:

  • Complete command-line used to run the tool
  • Tool --version
  • MySQL version of all servers involved
  • Output from the tool including STDERR
  • Input files (log/dump/config files, etc.)

If possible, include debugging output by running the tool with PTDEBUG; see “ENVIRONMENT”.

DOWNLOADING

Visit http://www.percona.com/software/percona-toolkit/ to download the latest release of Percona Toolkit. Or, get the latest release from the command line:

wget percona.com/get/percona-toolkit.tar.gz

wget percona.com/get/percona-toolkit.rpm

wget percona.com/get/percona-toolkit.deb

You can also get individual tools from the latest release:

wget percona.com/get/TOOL

Replace TOOL with the name of any tool.

AUTHORS

Daniel Nichter

ABOUT PERCONA TOOLKIT

This tool is part of Percona Toolkit, a collection of advanced command-line tools developed by Percona for MySQL support and consulting. Percona Toolkit was forked from two projects in June, 2011: Maatkit and Aspersa. Those projects were created by Baron Schwartz and developed primarily by him and Daniel Nichter, both of whom are employed by Percona. Visit http://www.percona.com/software/ for more software developed by Percona.

VERSION

pt-fk-error-logger 2.0.5

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