PerconaXtraBackup innobackupex 参数
PerconaXtraBackup 2.1.5
./innobackupex =item --help
Options:
--apply-log
Prepare a backup in BACKUP-DIR by applying the transaction log file
named "xtrabackup_logfile" located in the same directory. Also,
create new transaction logs. The InnoDB configuration is read from
the file "backup-my.cnf".
在BACKUP-DIR目录相同位置,使用事物日志文件名"xtrabackup_logfile",在BACKUP-DIR目 录中准备一个备份。
另外,创建新的事物日志。innoDB的配置是从文件"backup-my.inf"中读取的。
--compact
Create a compact backup with all secondary index pages omitted. This
option is passed directly to xtrabackup. See xtrabackup
documentation for details.
同所有的二级索引一起,创建一个紧凑的备份。这个选项直接传递到xtrabackup。
--compress
This option instructs xtrabackup to compress backup copies of InnoDB
data files. It is passed directly to the xtrabackup child process.
Try 'xtrabackup --help' for more details.
这个选项指示xtrabackup 对InnoDB 数据文件进行压缩备份副本,它被直接传递到 xtrabackup子进程。
--compress-threads
This option specifies the number of worker threads that will be used
for parallel compression. It is passed directly to the xtrabackup
child process. Try 'xtrabackup --help' for more details.
这个选项指定将用于并行压缩的工作线程的数目。它被直接传递到xtrabackup子进程。
--compress-chunk-size
This option specifies the size of the internal working buffer for
each compression thread, measured in bytes. It is passed directly to
the xtrabackup child process. Try 'xtrabackup --help' for more
details.
这个选项指定每个压缩线程的内部工作缓冲区大小,以字节为单位。它被直接传递到xtrabackup子进程。
--copy-back
Copy all the files in a previously made backup from the backup
directory to their original locations.
在之前制作的备份的备份目录中,拷贝所有文件,到其原始位置(即数据库中)。
注解:意思就是从备份目录中还原数据库。
--databases=LIST
This option specifies the list of databases that innobackupex should back up.
The option accepts a string argument or path to file that contains the list of databases to back up.
The list is of the form "databasename1[.table_name1] databasename2[.table_name2] . . .".
If this option is not specified, all databases containing MyISAM and InnoDB tables will be backed up.
Please make sure that --databases contains all of the InnoDB databases and tables, so that all of the
innodb.frm files are also backed up.
In case the list is very long, this can be specified in a file, and the full path of the file can
be specified instead of the list. (See option --tables-file.)
这个选项指定innobackupex需要备份的数据库的列表。
此选项接受一个字符串参数或者文件路径,包含备份的数据库列表。
列表的格式是:"databasename1[.table_name1] databasename2[.table_name2] . . ."
如果没有指定此选项,则包含MyISAM和InnoDB表的所有数据库都将被备份。
请确保 --databases 包含了所有的InnoDB数据库和表,让所有innodb.frm文件也备份。
万一列表很长,这可以在一个文件中指定,并且用该文件的全路径来代替列表。
(见选项 --tables-file)。
注解:也就是说,该选项指定要备份的数据库和表,如果不指定,则备份所有数据库和表。
可以用参数,也可以将参数的内容保存在一个文件中,通过指定改文件来引用参数。
--decompress
Decompresses all files with the .qp extension in a backup previously
made with the --compress option.
在先前使用 --compress 选项制作的备份中,解压缩所有 .qp扩展名的文件。
--decrypt=ENCRYPTION-ALGORITHM
Decrypts all files with the .xbcrypt extension in a backup
previously made with --encrypt option.
在先前使用 --encrypt选项制作的备份中,解密所有 .xbcrypt扩展名的文件。
--debug-sleep-before-unlock=SECONDS
This is a debug-only option used by the XtraBackup test suite.
这是一个 debug-only选项,使用XtraBackup 测试套件
--defaults-file=[MY.CNF]
This option specifies what file to read the default MySQL options
from. The option accepts a string argument. It is also passed
directly to xtrabackup's --defaults-file option. See the xtrabackup
documentation for details.
这个选项定义读取默认的MySQL选项文件。此选项接受一个字符串参数。
它也直接传递到 xtrabackup's 的--defaults-file选项。详见xtrabackup文档。
--defaults-extra-file=[MY.CNF]
This option specifies what extra file to read the default MySQL
options from before the standard defaults-file. The option accepts a
string argument. It is also passed directly to xtrabackup's
--defaults-extra-file option. See the xtrabackup documentation for
details.
这个选项定义附加的文件,从标准的defaults-file读取默认MySQL选项之前。
这个选项接受一个字符串参数。它直接传递到xtrabackup的--defaults-extra-file选项。
--encrypt=ENCRYPTION-ALGORITHM
This option instructs xtrabackup to encrypt backup copies of InnoDB
data files using the algorithm specified in the
ENCRYPTION-ALGORITHM. It is passed directly to the xtrabackup child
process. Try 'xtrabackup --help' for more details.
这个选项指示 xtrabackup使用指定的ENCRYPTION-ALGORITHM算法来加密InnoDB数据文件的备份拷贝。
它直接传递给xtrabackup子进程。
可以用"xtrabackup --help"了解更多详情。
--encrypt-key=ENCRYPTION-KEY
This option instructs xtrabackup to use the given ENCRYPTION-KEY
when using the --encrypt or --decrypt options. During backup it is
passed directly to the xtrabackup child process. Try 'xtrabackup
--help' for more details.
当使用--encrypt 或 --decrypt选项时,此选项指示xtrabackup使用给定的 ENCRYPTION-KEY。
在备份的过程中直接传递给xtrabackup子进程。
可以用xtrabackup --help了解更多信息。
--encrypt-key-file=ENCRYPTION-KEY-FILE
This option instructs xtrabackup to use the encryption key stored in
the given ENCRYPTION-KEY-FILE when using the --encrypt or --decrypt options.
Try 'xtrabackup --help' for more details.
当使用--encrypt 或 --decrypt选项时,此选项指示xtrabackup用给定的ENCRYPTION-KEY-FILE加密key存储。
可以用xtrabackup --help了解更多信息。
--encrypt-threads
This option specifies the number of worker threads that will be used
for parallel encryption. It is passed directly to the xtrabackup
child process. Try 'xtrabackup --help' for more details.
这个选项指定将用于并行加密工作线程的数目。
它直接传递给xtrabackup子进程。可以用xtrabackup --help了解更多信息。
--encrypt-chunk-size
This option specifies the size of the internal working buffer for
each encryption thread, measured in bytes. It is passed directly to
the xtrabackup child process. Try 'xtrabackup --help' for more
details.
这个选项为每个加密线程指定内部工作缓冲区大小,以字节为单位的大小。
它直接传递给xtrabackup子进程。可以用xtrabackup --help了解更多信息。
--export
This option is passed directly to xtrabackup's --export option. It
enables exporting individual tables for import into another server.
See the xtrabackup documentation for details.
这个选项直接传递给xtrabackup's的--export选项。
它启用:导出单个表导入到其他服务器。
查看xtrabackup文档了解详细信息。
--extra-lsndir=DIRECTORY
This option specifies the directory in which to save an extra copy
of the "xtrabackup_checkpoints" file. The option accepts a string
argument. It is passed directly to xtrabackup's --extra-lsndir
option. See the xtrabackup documentation for details.
这个选项指定"xtrabackup_checkpoints" 文件保存额外副本的目录。该选项接受一个字符串参数。
它直接传递给 xtrabackup's的--extra-lsndir选项。
查看xtrabackup文档了解 详细信息。
--galera-info
This options creates the xtrabackup_galera_info file which contains
the local node state at the time of the backup. Option should be
used when performing the backup of Percona-XtraDB-Cluster.
这个选项创建一个在备份的过程中,包含本地节点状态,当前时间的xtrabackup_galera_info文件。
应该使用这个选项,当 Percona-XtraDB-Cluster执行备份时。
--help
This option displays a help screen and exits.
该选项 显示帮助屏幕并且退出。
--host=HOST
This option specifies the host to use when connecting to the
database server with TCP/IP. The option accepts a string argument.
It is passed to the mysql child process without alteration. See
mysql --help for details.
这个选项指定使用TCP/IP协议连接数据库服务器的主机。
这个选项接受一个字符串参数。它不改变的直接传递到mysql子进程。
查看mysql --help了解详细信息。
--ibbackup=IBBACKUP-BINARY
This option specifies which xtrabackup binary should be used.
The option accepts a string argument.
IBBACKUP-BINARY should be the command used to run XtraBackup.
The option can be useful if the xtrabackup binary is not in your search path or working directory.
If this option is not specified, innobackupex attempts to determine the binary to use automatically.
By default, "xtrabackup" is the command used.
However, when option --copy-back is specified,"xtrabackup_51" is the command used.
And when option --apply-log is specified,
the binary is used whose name is in the file "xtrabackup_binary" in the backup directory, if that file exists.
这个选项指定哪个xtrabackup binary 应该被使用。
这个选项接受一个字符串参数。
IBBACKUP-BINARY应该指令使用,在运行XtraBackup时。
如果xtrabackup binary不在你的搜索路径或工作目录时,该选项可能非常有用。
如果未指定此选项,innobackupex尝试确定自动使用binary。
默认情况下,“xtrabackup”是指令使用。
然而,当定义了--copy-back 选项,xtrabackup_51 指令使用。
而当指定了--apply-log选项 ,binary被使用,其名称在备份目录中的“xtrabackup_binary”文件中
,如果该文件存在的话。
--include=REGEXP
This option is a regular expression to be matched against table
names in databasename.tablename format. It is passed directly to
xtrabackup's --tables option. See the xtrabackup documentation for
details.
这个选项在"数据库名.表名"格式中,针对表名,使用正则表达式来匹配。
它直接传递到 xtrabackup's的 --tables 选项。
查看xtrabackup文档信息。
--incremental
This option tells xtrabackup to create an incremental backup, rather
than a full one. It is passed to the xtrabackup child process.
When this option is specified, either --incremental-lsn or --incremental-basedir can also be given.
If neither option is given,option --incremental-basedir is passed to xtrabackup by default,
set to the first timestamped backup directory in the backup base directory.
这个选项告诉xtrabackup创建一个增量备份,而不是一个完整备份。
它直接传递给xtrabackup子进程。
当指定了该选项,要么,还要给出--incremental-lsn 或者--incremental-basedir 。
如果两个选项都没有给出,则选项 --incremental-basedir 默认传递给xtrabackup,备份的基本目录(basedir)设置为第一个时间戳备份目录。
--incremental-basedir=DIRECTORY
This option specifies the directory containing the full backup that
is the base dataset for the incremental backup. The option accepts a
string argument. It is used with the --incremental option.
这个选项指定包含完整备份的目录,这是进行增量备份的基础数据集。
这个选项接受一个字符串参数。它和 --incremental选项一起来使用。
注:指定完整备份的目录,在完整备份的基础上来实现整理备份,同--incremental一起来使用。
--incremental-dir=DIRECTORY
This option specifies the directory where the incremental backup
will be combined with the full backup to make a new full backup. The
option accepts a string argument. It is used with the --incremental
option.
这个选项指定增量备份的目录,结合完整备份来制作一个新的完整备份。
该选项接受一个字符串参数,它和--incremental选项一同使用。
--incremental-force-scan
This options tells xtrabackup to perform full scan of data files for
taking an incremental backup even if full changed page bitmap data is available to enable the backup without the full scan.
这个选项告诉xtrabackup对增量备份进行数据文件全扫描,即使完全改变了页面位图数据,是用于没有完整扫描的备份。
--log-copy-interval
This option specifies time interval between checks done by log
copying thread in milliseconds.
这个选项通过日志复制线程,指定完成检查之间的时间间隔,毫秒为单位。
--incremental-lsn
This option specifies the log sequence number (LSN) to use for the incremental backup.
The option accepts a string argument.
It is used with the --incremental option.
It is used instead of specifying --incremental-basedir.
For databases created by MySQL and Percona Server 5.0-series versions, specify the LSN as two 32-bit integers
in high:low format.
For databases created in 5.1 and later, specify the LSN as a single 64-bit integer.
这个选项指定用于增量备份的日志序列号(LSN)。
该选项接受一个字符串参数。
它和 --incremental选项一起使用。
它是用来替代指定的--incremental-basedir 选项。
对于由MySQL和Percona Server 5.0-series版本中创建的数据库,指定的LSN为在“高:低"格式中的两个32位整数。
对于5.1和更高版本中创建的数据库,指定LSN作为一个单一的64位整数。
--kill-long-queries-timeout=SECONDS
This option specifies the number of seconds innobackupex waits
between starting FLUSH TABLES WITH READ LOCK and killing those queries that block it.
Default is 0 seconds, which means innobackupex will not attempt to kill any queries.
这个选项指定innobackupex 等待的秒数,在启动FLUSH TABLES WITH READ LOCK和杀死阻碍它的那些查询之间。
默认值是0秒,这意味着innobackupex将不会试图杀死任何查询。
--kill-long-query-type=all|update
This option specifies which types of queries should be killed to
unblock the global lock. Default is "all".
这个选项指定哪些类型的查询应该被杀死,来解锁全局锁。默认值是“all”。
--lock-wait-timeout=SECONDS
This option specifies time in seconds that innobackupex should wait
for queries that would block FTWRL before running it.
If there are still such queries when the timeout expires, innobackupex terminates with an error.
Default is 0, in which case innobackupex does not
wait for queries to complete and starts FTWRL immediately.
这个选项指定innobackupex等待查询完成的时间,以秒为单位,在FTWRL运行之前阻止其运行。
如果还有这样的过期查询(超过了 timeout的时间),innobackupex终止并显示错误。
默认为0,在这种情况下innobackupex不等待查询完成,并立即开始FTWRL。
--lock-wait-threshold=SECONDS
This option specifies the query run time threshold which is used by
innobackupex to detect long-running queries with a non-zero value of --lock-wait-timeout.
FTWRL is not started until such long-running queries exist.
This option has no effect if --lock-wait-timeout is 0.
Default value is 60 seconds.
这个选项指定查询运行时间的阀值,
用于被innobackupex 检测到的"long-running queries" 是一个"--lock-wait-timeout"范围内的非零值。
FTWRL 不会启动,直到这个 "long-running queries "退出。
如果 --lock-wait-timeout 设置为 0,这个选项将没有效果。
默认值是60秒。
注: 指定查询时间的阀值,innobackupex检测长查询的值,如果该值小于--lock-wait-timeout定义的值,则执行 FTWRL前,等待长查询结束。
如果大于该值,则--lock-wait-timeout自动会对该查询采取动作。
如果 --lock-wait-timeout 设置为 0,这个选项将没有效果。
--lock-wait-query-type=all|update
This option specifies which types of queries are allowed to complete
before innobackupex will issue the global lock. Default is all.
这个选项定义哪些查询可以完成,在innobackupex发出全局锁前。
默认是 all。
--move-back
Move all the files in a previously made backup from the backup directory to the actual datadir location.
Use with caution, as it removes backup files.
移动之前备份的所有文件,从备份目录到实际datadir位置。
请谨慎使用,因为它消除了备份文件。
--no-lock
Use this option to disable table lock with "FLUSH TABLES WITH READ LOCK".
Use it only if ALL your tables are InnoDB and you DO NOT CARE about the binary log position of the backup.
This option shouldn't be used if there are any DDL statements being executed or
if any updates are happening on non-InnoDB tables (this includes the system MyISAM tables in the mysql database),
otherwise it could lead to an inconsistent backup.
If you are considering to use --no-lock because your backups are failing to acquire the lock, this could be because
of incoming replication events preventing the lock from succeeding.
Please try using --safe-slave-backup to momentarily stop the replication slave thread, this may help the backup to succeed and
you then don't need to resort to using this option.
使用这个选项禁用表锁"FLUSH TABLES WITH READ LOCK"。
使用它,仅在所有的表是InnoDB表和不需要关注备份的二进制日志的位置信息。
这个选项不应该使用,如果任何DDL语句正在执行或者任何更新发生在非InnoDB表上(这包括MySQL数据库上的系统MyISAM表)
否则,可能导致不一致的备份。
如果你正在考虑使用 --no-lock,由于您的备份不能获得锁,这可能是由于传入复制事件防止获得锁。
请尝试使用 --safe-slave-backup 来暂时停止replication slave 线程,这可以帮助备份成功,并且你不必再使用此项。
--no-timestamp
This option prevents creation of a time-stamped subdirectory of the BACKUP-ROOT-DIR given on the command line.
When it is specified, the backup is done in BACKUP-ROOT-DIR instead.
给出这个命令行,这个选项可以防止在BACKUP-ROOT-DIR目录创建一个时间标记的子目录。
当它被定义,在BACKUP-ROOT-DIR目录完成备份。
--parallel=NUMBER-OF-THREADS
On backup, this option specifies the number of threads the xtrabackup child process should use to back up files concurrently.
The option accepts an integer argument. It is passed directly to xtrabackup's --parallel option.
See the xtrabackup documentation for details.
对于备份,这个选项指定xtrabackup子进程同时备份文件,使用的线程数量。
它接受一个整数参数。它直接传递给xtrabackup 的--parallel选项。
On --decrypt or --decompress it specifies the number of parallel forks that should be used to process the backup files.
对于--decrypt 或者 --decompress,它指定用于处理备份文件的并行工作的数量。
注:(the number of parallel forks不知道什么意思,怀疑是不是works错打成forks了)
--password=WORD
This option specifies the password to use when connecting to the
database. It accepts a string argument. It is passed to the mysql
child process without alteration. See mysql --help for details.
这个选项定义连接到数据库的密码。它接受一个字符串参数。它无修改的直接传递到mysql子进程。
--port=PORT
This option specifies the port to use when connecting to the
database server with TCP/IP. The option accepts a string argument.
It is passed to the mysql child process. It is passed to the mysql
child process without alteration. See mysql --help for details.
定义连接到MySQL服务器的端口。
--rebuild-indexes
This option only has effect when used together with the --apply-log option and is passed directly to .
When used, makes xtrabackup rebuild all secondary indexes after applying the log.
This option is normally used to prepare compact backups. See the
XtraBackup manual for more information.
这个选项仅与--apply-log一起使用时才生效,并且直接传递给xtrabackup。
使用时,应用日志后,让xtrabackup重建所有的二级索引。
这个选项通常用于制作紧凑的备份。查看xtrabackup手册获取更多信息。
--rebuild-threads
This option only has effect when used together with the --apply-log
and --rebuild-indexes option and is passed directly to xtrabackup.
When used, xtrabackup processes tablespaces in parallel with the
specified number of threads when rebuilding indexes. See the
XtraBackup manual for more information.
这个选项仅与--apply-log和--rebuild-indexes一起使用时才生效,并且直接传递给xtrabackup。
使用时,重建索引的时候,定义xtrabackup并行处理表空间的线程数量。
--redo-only
This option should be used when preparing the base full backup and when merging all incrementals except the last one.
This option is passed directly to xtrabackup's --apply-log-only option.
This forces xtrabackup to skip the "rollback" phase and do a "redo" only.
This is necessary if the backup will have incremental changes applied to it later.
See the xtrabackup documentation for details.
这个选项应该被使用,在准备基础完整备份, 合并所有增量备份,除了最后一个.
这个选项直接传递给 xtrabackup的 --apply-log-only选项.
它强制xtrabackup跳过"rollback"(回滚)阶段,并只做"redo"(重做).
这是必要的,如果以后备份的增量变化将应用到它.
--rsync
Uses the rsync utility to optimize local file transfers.
When this option is specified, innobackupex uses rsync to copy all non-InnoDB
files instead of spawning a separate cp for each file,
which can be much faster for servers with a large number of databases or tables.
This option cannot be used together with --stream.
使用rsync的工具来优化本地文件传输。
当指定此选项时,innobackupex使用rsync来复制所有的非InnoDB文件,而不是为每个文件生成一个单独的拷贝,
这非常快,对于具有大量的数据库或表的服务器。
这个选项不能与 --stream 一起使用。
--safe-slave-backup
Stop slave SQL thread and wait to start backup until Slave_open_temp_tables in "SHOW STATUS" is zero.
If there are no open temporary tables, the backup will take place,
otherwise the SQL thread will be started and stopped until there are no open temporary tables.
The backup will fail if Slave_open_temp_tables does not become zero after --safe-slave-backup-timeout seconds.
The slave SQL thread will be restarted when the backup finishes.
停止 slave SQL_thread线程并且等待备份开始,直到Slave_open_temp_tables变量 在 "SHOW STATUS" 命令中显示的值是零。
如果没有打开的临时表,则备份会发生,否则SQL线程将被启动和停止,直到没有打开的临时表。
如果 Slave_open_temp_tables 的值在 --safe-slave-backup-timeout 定义的秒数之后还不是零,备份将失败。
备份完成后slave SQL_thread线程将会重新启动。
--safe-slave-backup-timeout
How many seconds --safe-slave-backup should wait for
Slave_open_temp_tables to become zero. (default 300)
在Slave_open_temp_tables 变成零之前,--safe-slave-backup 必须等待多少秒 。(默认是300)
--slave-info
This option is useful when backing up a replication slave server.
It prints the binary log position and name of the master server.
It also writes this information to the "xtrabackup_slave_info" file as a "CHANGE MASTER" command.
A new slave for this master can be set up by starting a slave server on this backup and issuing a "CHANGE
MASTER" command with the binary log position saved in the "xtrabackup_slave_info" file.
备份复制slave服务器时,该选项很有用。
它打印master服务器上的二进制日志的名字和位置。
它也将这些信息写入到"xtrabackup_slave_info"文件,作为"CHANGE MASTER"命令的输入。
这个MASTER 可以设置一个新的slave,在这个备份上启动一个slave 服务器 ,发出一个有二进制日志位置的"CHANGE MASTER" 命令,二进制日志位置保存
在"xtrabackup_slave_info" 文件中。
--socket=SOCKET
This option specifies the socket to use when connecting to the local database server with a UNIX domain socket.
The option accepts a string argument.
It is passed to the mysql child process without alteration. See mysql --help for details.
这个选项定义一个socket,在用unix domain socket连接本地数据库服务器时。
这个选项接受一个字符串参数。它不更改的传递给mysql子进程。
--stream=STREAMNAME
This option specifies the format in which to do the streamed backup.
The option accepts a string argument. The backup will be done to STDOUT in the specified format.
Currently, the only supported formats are tar and xbstream.
This option is passed directly to xtrabackup's --stream option.
这个选项定义流备份的格式。
这个选项接受一个字符串参数。备份以指定格式到STDOUT。
当前,仅支持tar和xbstream格式。这个选项直接传递给xtrabackup的 --stream 选项。
--tables-file=FILE
This option specifies the file in which there are a list of names of the form database.
The option accepts a string argument.table, one per line.
The option is passed directly to xtrabackup's --tables-file option.
这个选项指定来自数据库的名称列表的文件。该选项接受一个字符串参数。表,每行一个。
这个选项直接传递给 xtrabackup的--tables-file选项。
--throttle=IOS
This option specifies a number of I/O operations (pairs of
read+write) per second. It accepts an integer argument. It is passed
directly to xtrabackup's --throttle option.
这个选项定义每秒的I/O操作(双读+写)。它接受一个整数参数。
它直接传递给xtrabackup的--throttle选项
--tmpdir=DIRECTORY
This option specifies the location where a temporary file will be stored. The option accepts a string argument.
It should be used when --stream is specified.
For these options, the transaction log will first be stored to a temporary file, before streaming.
This option specifies the location where that temporary file will be stored.
If the option is not specified, the default is to use the value of tmpdir read from the server configuration.
这个选项定义临时文件存储的位置。该选项接受一个字符串参数。
当定义了--stream选项的时候,应当使用该选项。
对于这些选项,在流之前,事物日志将被首选存储到一个临时文件。
如果这个选项没有指定,默认使用从服务器的配置读取的tmpdir值。
--use-memory=B
This option accepts a string argument that specifies the amount of memory in bytes
for xtrabackup to use for crash recovery while preparing a backup.
Multiples are supported providing the unit (e.g. 1MB, 1GB).
It is used only with the option --apply-log. It is passed directly to xtrabackup's --use-memory option.
See the xtrabackup documentation for details.
这个选项接受一个字符串参数,定义xtrabackup用于奔溃恢复而准备一个备份时,使用内存的字节数量。
提供支持的倍数单位(例如 1MB,1GB)。
它仅和 --apply-log选项一起使用。它直接传递给xtrabackup的--use-memory选项。
--user=NAME
This option specifies the MySQL username used when connecting to the server, if that's not the current user.
The option accepts a string argument.
It is passed to the mysql child process without alteration. See mysql --help for details.
这个选项指定连接到MySQL服务器的用户名。
--defaults-group=GROUP-NAME
This option specifies the group name in my.cnf which should be used.
This is needed for mysqld_multi deployments.
该选项定义在my.cnf中的组名,应该使用。
这需要部署mysqld_multi
--version
This option displays the xtrabackup version and copyright notice and
then exits.
注:英文水平有限,结合google翻译完成,如有错误之处还请谅解。