Rechercher une page de manuel
mk-parallel-restore
Langue: en
Version: 2008-12-29 (fedora - 04/07/09)
Section: 1 (Commandes utilisateur)
Sommaire
NAME
mk-parallel-restore - Load files into MySQL in parallel.SYNOPSIS
mk-parallel-restore /path/to/files mk-parallel-restore --tab /path/to/files
Do not rely on mk-parallel-restore for your backups unless you have tested it. You have been warned.
DESCRIPTION
mk-parallel-restore is a way to load SQL or delimited-file dumps into MySQL in parallel at high speed. It is especially designed for restoring files dumped by mk-parallel-dump. It automatically detects whether a file contains SQL or delimited data from the filename extension, and either shells out to "mysql" or executes "LOAD DATA INFILE" with the file. On UNIX-like systems, it will even make a FIFO to decompress gzipped files for "LOAD DATA INFILE".By default it discovers all files in the directory you specify on the command line. It uses the file's parent directory as the database name and the file's name (up to the first dot) as the table name. It can deal with files named like the following:
dir/tbl.sql dir/tbl.txt dir/tbl.csv dir/tbl.trg
It is also happy with files that look like this, where "EXT" is one of the extensions just listed.
dir/tbl.EXT.000 dir/tbl.EXT.000.gz
By default, it loads "SQL" files first, if they exist, then loads "CSV" or "TXT" files next, in order of the numbers in the filename extension as just shown. This makes it easy for you to reload a table's definition followed by its data, in case you dumped them into separate files (as happens with "mysqldump"'s "--tab" option). It loads "TRG" files, which create triggers, last. Creating the triggers before loading data might keep the data from being restored correctly. Files that are named 00_views.sql are loaded even later, after all the parallel restores are finished; dependencies among views and tables make them hard to restore one at a time. See mk-parallel-dump for details on how data is dumped.
Exit status is 0 if everything went well, 1 if any files failed, and any other value indicates an internal error.
OUTPUT
Output depends on verbosity. When ``--test'' is given, output includes commands that would be executed.When ``--verbose'' is 0, there is normally no output unless there's an error.
When ``--verbose'' is 1, there is one line of output for the entire job, showing how many tables were processed, how many files were loaded with what status, how much time elapsed, and how much time the parallel load jobs added up to. If any files were skipped, the filenames are printed to the output.
When ``--verbose'' is 2, there's one line of output per table, showing extra data such as how many threads were running when each table finished loading:
DATABASE TABLE FILES TIME STATUS THREADS sakila language 2 0.07 0 2 sakila film_actor 2 0.07 0 2 sakila actor 2 0.06 0 2 sakila payment 2 0.07 0 2 sakila transport_backup 2 0.05 0 2 sakila country 2 0.08 0 2 sakila film 2 0.05 0 2 sakila rental 2 0.07 0 2
SPEED OF PARALLEL LOADING
User-contributed benchmarks are welcome. See <http://www.paragon-cs.com/wordpress/?p=52> for one user's experiences.DOWNLOADING
You can download Maatkit from Google Code at <http://code.google.com/p/maatkit/>, or you can get any of the tools easily with a command like the following:wget http://www.maatkit.org/get/toolname or wget http://www.maatkit.org/trunk/toolname
Where "toolname" can be replaced with the name (or fragment of a name) of any of the Maatkit tools. Once downloaded, they're ready to run; no installation is needed. The first URL gets the latest released version of the tool, and the second gets the latest trunk code from Subversion.
OPTIONS
- --askpass
- Prompt for a password when connecting to MySQL.
- --atomicresume
- negatable: yes; default: yes
Treat chunks as atomic when resuming restore.
By default "mk-parallel-restore" resumes restoration from the first chunk that is missing all its rows. For dumps of transactionally-safe tables (InnoDB), it cannot happen that a chunk is only partially restored. Therefore, restoring from the first missing chunk is safe.
However, for dumps of non-transactionally safe tables, it is possible that a chunk can be only partially restored. In such cases, the chunk will wrongly appear to be fully restored. Therefore, you must specify "--noatomicresume" so that the partially restored chunk is fully restored.
- --basedir
- type: string
Directory where FIFO files will be created.
- --biggestfirst
- negatable: yes; default: yes
Restore the biggest tables first for highest concurrency.
- --bulkinsbufsize
- type: int
Set bulk_insert_buffer_size before each "LOAD DATA INFILE".
Has no effect without ``--tab''.
- --charset
- short form: -A; type: string; default: BINARY
Sets the connection, database, and "LOAD DATA INFILE" character set.
The default is "BINARY", which is the safest value to use for "LOAD DATA INFILE". Has no effect without ``--tab''.
- --commit
- Commit after each load via "LOAD DATA INFILE".
- --createdb
- Create databases if they don't exist.
- --csv
- Files are in CSV format (implies ``--tab'').
Changes ``--tab'' options so the following "LOAD DATA INFILE" statement is used:
LOAD DATA INFILE <filename> INTO TABLE <table> FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '\"' LINES TERMINATED BY '\n';
- --database
- short form: -D; type: string
Load all files into this database.
Overrides the database which is normally specified by the directory in which the files live. Does not specify a default database for the connection.
- --databases
- short form: -d; type: hash
Restore only this comma-separated list of databases.
- --dbregex
- type: string
Restore only databases whose names match this regex.
- --defaults-file
- short form: -F; type: string
Only read mysql options from the given file. You must give an absolute pathname.
- --disablekeys
- negatable: yes
Execute "ALTER TABLE DISABLE KEYS" before each table.
- --fifo
- negatable: yes; default: yes
Stream files into a FIFO for --tab.
Load compressed tab-separated files by piping them into a FIFO and using the FIFO with "LOAD DATA INFILE", instead of by decompressing the files on disk. Sets ``--umask'' to 0.
- --host
- short form: -h; type: string
Connect to host.
- --ignore
- short form: -i
Adds the "IGNORE" modifier to "LOAD DATA INFILE".
- --ignoredb
- short form: -g; type: Hash
Ignore this comma-separated list of databases.
- --ignoretbl
- short form: -n; type: Hash
Ignore this comma-separated list of table names.
Table names may be qualified with the database name.
- --local
- short form: -L
Uses the "LOCAL" option to "LOAD DATA INFILE".
If you enable this option, the files are read locally by the client library, not by the server.
- --locktables
- negatable: yes
Lock tables before "LOAD DATA INFILE".
- --noautovalon0
- negatable: yes
Set SQL "NO_AUTO_VALUE_ON_ZERO" before "LOAD DATA INFILE".
- --nobinlog
- negatable: yes
Set "SQL_LOG_BIN=0" before "LOAD DATA INFILE".
This prevents large loads from being logged to the server's binary log.
- --noforeignkeys
- negatable: yes
Set "FOREIGN_KEY_CHECKS=0" before "LOAD DATA INFILE".
- --noresume
- Do not resume restore.
By default, "mk-parallel-restore" checks each tables' chunks for existing rows and restores only from the point where a previous restore stopped. This option disables restore resumption and fully restores every table.
Restore resumption does not work with tab-separated files or dumps that were not chunked.
- --nouniquechecks
- negatable: yes
Set "UNIQUE_CHECKS=0" before "LOAD DATA INFILE".
- --numthread
- short form: -m; type: int
Specifies the number of parallel processes to run.
The default is 2 (this is mk-parallel-restore after all --- 1 is not parallel). On GNU/Linux machines, the default is the number of times 'processor' appears in /proc/cpuinfo. On Windows, the default is read from the environment. In any case, the default is at least 2, even when there's only a single processor.
- --password
- short form: -p; type: string
Password to use when connecting.
- --port
- short form: -P; type: int
Port number to use for connection.
- --progress
- Display progress messages.
Progress is displayed each time a table finishes loading. Progress is calculated by measuring the size of each file to be loaded, and assuming all bytes are created equal. The output is the completed and total size, the percent completed, estimated time remaining, and estimated completion time.
- --quiet
- short form: -q
Sets ``--verbose'' to 0.
- --replace
- short form: -r
Adds the "REPLACE" modifier to "LOAD DATA INFILE".
- --setvars
- type: string; default: wait_timeout=10000
Set these MySQL variables.
Specify any variables you want to be set immediately after connecting to MySQL. These will be included in a "SET" command.
- --socket
- short form: -S; type: string
Socket file to use for connection.
- --tab
- short form: -T
Load tab-separated files with "LOAD DATA INFILE".
This is similar to what "mysqlimport" does, but more flexible. Enables the following options, unless they are specifically disabled: ``--commit'', ``--disablekeys'', ``--noautovalon0'', ``--nobinlog'', ``--nouniquechecks'', ``--noforeignkeys''.
- --tables
- short form: -t; type: hash
Restore only this comma-separated list of table names.
Table names may be qualified with the database name.
- --tblregex
- type: string
Restore only tables whose names match this regex.
- --test
- Print commands instead of executing them.
- --truncate
- Run "TRUNCATE TABLE" before "LOAD DATA INFILE".
This will delete all rows from a table before loading the first tab-delimited file into it.
- --umask
- type: string
Set the program's "umask" to this octal value.
This is useful when you want created files (such as FIFO files) to be readable or writable by other users (for example, the MySQL server itself).
- --user
- short form: -u; type: string
User for login if not current user.
- --verbose
- short form: -v; cumulative: yes; default: 1
Verbosity; can specify multiple times.
Repeatedly specifying it increments the verbosity. Default is 1 if not specified. See ``OUTPUT''.
- --wait
- short form: -w; type: time; default: 5m
Wait limit when server is down.
If the MySQL server crashes during loading, waits until the server comes back and then continues with the rest of the files. "mk-parallel-restore" will check the server every second until this time is exhausted, at which point it will give up and exit.
ENVIRONMENT
The environment variable "MKDEBUG" enables verbose debugging output in all of the Maatkit tools:MKDEBUG=1 mk-....
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
Please use Google Code Issues and Groups to report bugs or request support: <http://code.google.com/p/maatkit/>.Please include the complete command-line used to reproduce the problem you are seeing, the version of all MySQL servers involved, the complete output of the tool when run with ``--version'', and if possible, debugging output produced by running with the "MKDEBUG=1" environment variable.
COPYRIGHT, LICENSE AND WARRANTY
This program is copyright 2007-2008 Baron Schwartz. 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 MERCHANTIBILITY 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.
AUTHOR
Baron Schwartz.SEE ALSO
See also mk-parallel-dump.VERSION
This manual page documents Ver 1.0.10 Distrib 2725 $Revision: 2311 $.Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre