1XBSTREAM(1)                   Percona XtraBackup                   XBSTREAM(1)
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NAME

6       xbstream - Percona xbstream Documentation
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8       To support simultaneous compression and streaming, a new custom stream‐
9       ing format called xbstream was  introduced  to  Percona  XtraBackup  in
10       addition  to the TAR format. That was required to overcome some limita‐
11       tions of traditional archive formats such as tar, cpio and others which
12       did not allow streaming dynamically generated files, for example dynam‐
13       ically compressed files. Other advantages of xbstream over  traditional
14       streaming/archive  format include ability to stream multiple files con‐
15       currently (so it is possible to use streaming in  the  xbstream  format
16       together with the --parallel option) and more compact data storage.
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18       This utility has a tar-like interface:
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20          · with  the  '-x' option it extracts files from the stream read from
21            its standard input to the current directory unless specified  oth‐
22            erwise with the '-C' option.
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24          · with  the  '-c'  option  it streams files specified on the command
25            line to its standard output.
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27       The utility also tries to minimize its impact on the OS page  cache  by
28       using the appropriate posix_fadvise() calls when available.
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30       When  compression  is  enabled  with  xtrabackup all data is being com‐
31       pressed, including the transaction log file and meta data files,  using
32       the specified compression algorithm. The only currently supported algo‐
33       rithm is 'quicklz'. The resulting files have the qpress archive format,
34       i.e.  every  *.qp file produced by xtrabackup is essentially a one-file
35       qpress archive and can be extracted and uncompressed by the qpress file
36       archiver.  This means that there is no need to uncompress entire backup
37       to restore a single table as with tar.gz.
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39       Files can be decompressed using the qpress tool that can be  downloaded
40       from here. Qpress supports multi-threaded decompression.
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AUTHOR

43       Percona LLC and/or its affiliates
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46       2009-2016, Percona LLC and/or its affiliates
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512.3.5                            Feb 13, 2019                      XBSTREAM(1)
Impressum