pt-fk-error-loggerp - Online in the Cloud

PROGRAM:

NAME

pt-fk-error-logger - Log MySQL foreign key errors.

SYNOPSIS

Usage: pt-fk-error-logger [OPTIONS] [DSN]

pt-fk-error-logger logs information about foreign key errors on the given DSN.
Information is printed to "STDOUT", and it can also be saved to a table by specifying
"--dest". The tool runs for forever unless "--run-time" or "--iterations" is specified.

Print foreign key errors on host1:

pt-fk-error-logger h=host1

Print foreign key errors on host1 once then exit:

pt-fk-error-logger h=host1 --iterations 1

Save foreign key errors on host1 to percona_schema.fke on host2:

pt-fk-error-logger h=host1 --dest h=host2,D=percona_schema,t=fke

RISKS

Percona Toolkit is mature, proven in the real world, and well tested, but all database
tools can pose a risk to the system and the database server. Before using this tool,
please:

· Read the tool's documentation

· Review the tool's known "BUGS"

· Test the tool on a non-production server

· Backup your production server and verify the backups

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.

By default the tool runs forever, checking every "--interval" seconds for new foreign key
errors. Specify "--run-time" and/or "--iterations" to limit how long the tool runs.

OUTPUT

The foreign key error text from "SHOW ENGINE INNODB STATUS" is printed to "STDOUT", unless
"--quiet" is specified. Errors and warnings are printed to "STDERR".

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.

--database
short form: -D; type: string

Connect to this database.

--defaults-file
short form: -F; type: string

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

--dest
type: DSN

Save foreign key errors in this table. The DSN must specify a database (D) and table
(t).

Missing DSN values are inherited from the DSN being monitored, so you can omit most
values if you're saving foreign key errors on the same host.

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: 30

How often to check for foreign key errors.

--iterations
type: int

How many times to check for foreign key errors. By default, this option is undefined
which means an infinite number of iterations. The tool always exits for "--run-time",
regardless of the value specified for this option. For example, the tool will exit
after 1 minute with "--run-time 1m --iterations 4 --interval 30" because 4 iterations
at 30 second intervals would take 2 minutes, longer than the 1 mintue run-time.

--log
type: string

Print all output to this file when daemonized.

--password
short form: -p; type: string

Password to use when connecting. If password contains commas they must be escaped
with a backslash: "exam\,ple"

--pid
type: string

Create the given PID file. The tool won't start if the PID file already exists and
the PID it contains is different than the current PID. However, if the PID file
exists and the PID it contains is no longer running, the tool will overwrite the PID
file with the current PID. The PID file is removed automatically when the tool exits.

--port
short form: -P; type: int

Port number to use for connection.

--quiet
Do not print foreign key errors; only print errors and warnings to "STDERR".

--run-time
type: time

How long to run before exiting. By default, the tool runs forever.

--set-vars
type: Array

Set the MySQL variables in this comma-separated list of "variable=value" pairs.

By default, the tool sets:

wait_timeout=10000

Variables specified on the command line override these defaults. For example,
specifying "--set-vars wait_timeout=500" overrides the defaultvalue of 10000.

The tool prints a warning and continues if a variable cannot be set.

--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.

--[no]version-check
default: yes

Check for the latest version of Percona Toolkit, MySQL, and other programs.

This is a standard "check for updates automatically" feature, with two additional
features. First, the tool checks the version of other programs on the local system in
addition to its own version. For example, it checks the version of every MySQL server
it connects to, Perl, and the Perl module DBD::mysql. Second, it checks for and warns
about versions with known problems. For example, MySQL 5.5.25 had a critical bug and
was re-released as 5.5.25a.

Any updates or known problems are printed to STDOUT before the tool's normal output.
This feature should never interfere with the normal operation of the tool.

For more information, visit <https://www.percona.com/version-check>.

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. If password contains commas they must be escaped
with a backslash: "exam\,ple"

· 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.

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