################## pt-checksum-filter ################## .. highlight:: perl **** NAME **** pt-checksum-filter - Filter checksums from pt-table-checksum. ******** SYNOPSIS ******** Usage: pt-checksum-filter [OPTION]... FILE pt-checksum-filter filters checksums from pt-table-checksum and prints those that differ. With no FILE, or when FILE is -, read standard input. Examples: .. code-block:: perl pt-checksum-filter checksums.txt pt-table-checksum host1 host2 | pt-checksum-filter pt-checksum-filter db1-checksums.txt db2-checksums.txt --ignore-databases ***** 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-checksum-filter is read-only and 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-checksum-filter `_. See also "BUGS" for more information on filing bugs and getting help. *********** DESCRIPTION *********** This program takes the unsorted, verbose output from pt-table-checksum and sorts it, then filters it so you only see lines that have different checksums or counts. You can pipe input directly into it from pt-table-checksum, or you can save the pt-table-checksum's output and run pt-checksum-filter on the resulting file(s). If you run it against just one file, or pipe output directly into it, it'll output results during processing. Processing multiple files is slightly more expensive, and you won't see any output until they're all read. *********** EXIT STATUS *********** An exit status of 0 (sometimes also called a return value or return code) indicates that no differences were found. If there were any differences, the tool exits with status 1. ******* OPTIONS ******* "--ignore-databases" and "--equal-databases" are mutually exclusive. This tool accepts additional command-line arguments. Refer to the "SYNOPSIS" and usage information for details. --equal-databases type: Hash This comma-separated list of databases are equal. These database names are always considered to have the same tables. In other words, this makes \ ``database1.table1.chunk1``\ equal to \ ``database2.table1.chunk1``\ if they have the same checksum. This disables incremental processing, so you won't see any results until all input is processed. --header short form: -h Preserves headers output by pt-table-checksum. --help Show help and exit. --ignore-databases Ignore the database name when comparing lines. This disables incremental processing, so you won't see any results until all input is processed. --master type: string The name of the master server. Specifies which host is the replication master, and sorts lines for that host first, so you can see the checksum values on the master server before the slave. --unique type: string Show unique differing host/db/table names. The argument must be one of host, db, or table. --verbose short form: -v Output all lines, even those that have no differences, except for header lines. --version Show version and exit. *********** 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: .. code-block:: perl PTDEBUG=1 pt-checksum-filter ... > 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-checksum-filter `_. 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: .. code-block:: perl 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: .. code-block:: perl wget percona.com/get/TOOL Replace \ ``TOOL``\ with the name of any tool. ******* AUTHORS ******* Baron Schwartz ********************* 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. ******************************** COPYRIGHT, LICENSE, AND WARRANTY ******************************** This program is copyright 2007-2011 Baron Schwartz, 2011 Percona Inc. Feedback and improvements are welcome. THIS PROGRAM IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2; OR the Perl Artistic License. On UNIX and similar systems, you can issue \`man perlgpl' or \`man perlartistic' to read these licenses. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. ******* VERSION ******* Percona Toolkit v1.0.0 released 2011-08-01